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Arlington Public Schools ADDENDUM ADDENDUM # 2 DATE

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3. 2 3 4 6 7 8 9 G tAL NOTES NOTES O INSTALL NEW CONDENSATE DRAIN EXISTING CONDENSATE D 2 UP TO ERU 1 ON ROOF INSTALL NEW 1 1 4 CONDENSATE DRAIN PIPE AND DRAIN SHALL BE REMOVED FOLLOW EXISTING 9 UP TO ERU 2 ON ROOF CONNECT TO NEW CONDENSATE DRAIN PIPE CONDENSATE ROUTE PROVIDE 1 4 SLOPE MIN E NOR Ta n 2 1 2 UP TO ERU 3 ON ROOF DRAIN CONDENSATE THROUGH EXTERIOR WALL AND 2 UP TO ERU 4 ON ROOF URN DOWN OVER GRASS L LI LI j 3 D tee ecg ie 2 UP TO ERU 5 ON ROOF CONNECT EXISTING 1 9 SUPPLY AND 9 RETURN TO 21 2 UP TO ERU 6 ON ROOF NEW COPPER MANIFOLD ABOVE CEILING PROVIDE TWO TAN RETURN MANIFOLDS D 2 1 2 UP TO ERU 7 ON ROO u s PY VL i EXISTING GEOTHERMAL BOREHOLES TYPICAL OF 9 SHALI 9 INSTALL NEW 1 1 4 CONDENSATE DRAIN PIPE IE PRESSURE TESTED FOR LEAKS ANY DAMAGED OR AND ROUTE THROUGH EXTERIOR WALL DOWN gt m EAKY BOREHOLE SHALL BE CAPPED AND ABANDONED IN AND CONNECT TO NEW CONDENSATE DRAIN LPS 0 DID amp B AC PIRE at A Pes 5 ONLY NON DAMAGED EXISTING BOREHOLE PIPING SHALI sieall Yi N _ iI LE E E CONN GIED N W SYSTEM AA TOILET TIC 2 ON 7 252 N 415A IN na wed iE li n WY Uu gt Peal 5 KI
4. ARLINGTON PUBLIC SCHOOLS TAVLOR ELEMENTARV SCHOOL HVAC RENOVATION 2600 North Stuart Street Arlington Virginia 22207 DRAWN MM CHECKED TS SCALE 1 4 1 0 2011 SHW Group ISSUE October 14 2011 11 11 2011 ADDENDUM 2 AREA D KEY PLAN NTS SHEET TITLE BASEMENT MECHANICAL ROOM HVAC PIPING PLAN M2 2 SHW Project 3111 003 00 DE SHWG ROUP ARCHITECTS ENGINEERS PLANNERS 11415 Isaac Newton Square Reston VA 20190 WATER SOURCE GEOTHERMAL HEAT PUMP SCHEDULE d YAN SHINE ALLEN amp SHARIFF _ COOLING ELECTRICAL DATA Ea Capacity Water Max Su at ert n eos ua ead TS E MBH teen Volts MAX VSD Refrigerant Supply Return Ar C Columbia MD 21048 Z Z m 0 TTE A GA ue i3 Hortzontat 660 ost iss sto 144 eise 750 620 saot sea7 eso 10097 1760 soo 4007 700 956 l eessizeo 90 1092 150 270 ast Reston Back Roht exneoie 0 4 200 ue ie Horizontat Med oso 159 sao esse l 4002 750 620 5347 stoa eso s9ss 246 l 3373 eses soo sosi zoo i000 i57 1975
5. SN i pes pon 6 jt pee 2 Ire 2 r 169 sapo STO im eee 121 m 4 wg i oa T wah pes 1138 195 1 ifl oed d d I l X E T T rc dd 5 3 3 4 4 N 2 3737 elis es Bw N 107 r amp N 3 4 el 1 STO A M9 3 PRINCIPAL S IDE B N B ny IE LI 3 N i 1 65 240 EDN O 141 if 3 47 N amp sj 37 JI ra p3 4 L2 1 2 amp is E 114A N N AA ROOM a CORRIDOR POD 1 2 i MAE Sa Sy jas 9 POD E c POD 8 BA M e Ier Be 121A e N STO STO N 1 E um li S 0 a sto 143 ES 003A 152 J og i 178 a 479 005A Es 7 l 5 2 1 2 i ipa A 1 1 2 E 106 l 104 T in T 3 4 5 ia ia 18 J 1 2 r3 1 e l 1 4 CONFERENCE VESTIBULE Es isa 2 1 2 n dera ndi ali aa i qa ee dE SS m nia p SSS SS 103 N JANITOR S CLO LOST amp FOUND IF CORRIDOR T E T at 2 coRRDoR l 2 COMMON M aj es x p a AL T i lwel Biha Uwe P 17 T LJ sTo EET 2 GLHPS TA sero AP OFFICE EXT DAY STO L pen pes 150 t LA 225 sey 237 VESTIBULE 8 2 GLHPR sdb 1 p U 1 1 4268 286 280 102 193 IM PUBLISHING GP yrouer TOILET 224 pm i i 0
6. 12 2 Factory run test report shall be provided at the request of the engineer contractor or owner 12 3 Testing Procedures 1 Unit shall be subjected to and pass a dielectric hipot test 2 All motorized dampers shall be cycled one full stroke while installed in the unit using the factory provided motorized actuators 3 Supply fan 3 1 Visually inspect ramp up ramp down and rotation direction of fan when enabled 3 2 Verify fan pressure proving switch operation 3 3 Measure and record current draw through supply fan motor s 4 Exhaust fan 4 1 Visually inspect ramp up ramp down and rotation direction of fan when enabled 4 2 Verify fan pressure proving switch operation 4 3 Measure and record current draw through exhaust fan motor s 5 Energy recovery wheel 5 1 Visually inspect energy recovery wheel cassette is free to rotate within cassette ENERGY RECOVERY HEAT PUMP UNIT 237200 5 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 5 2 Visually inspect energy recovery belt drive mechanism 5 3 Enable energy recovery wheel motor and ensure proper rotation 5 4 Measure and record current draw through energy recovery wheel motor 6 Refrigeration system 6 1 Measure and record subcooling and superheat on circuit A with hot gas reheat valve closed 096 after 15 minutes of steady state operation 6 2 Measure and record subcool
7. ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 SECTION 230524 HYDRONIC SPECIALTIES PART 1 GENERAL 1 01 WORK A TTOMMDOBP INCLUDED Air Separation Devices and Controls Air Vents Flow Measurement Devices Pressure Gauges Thermometers see spec section 230519 Temperature Transmitters Differential Pressure Transmitters Suction Diffusers Triple duty Valves Pressure and Temperature Test Plugs Expansion Tanks Strainers 1 02 SHOP DRAWINGS A Submit complete shop drawings including manufacturer s installation instructions 1 08 ACCEPTABLE MANUFACTURERS MIMMDOBDJ Bell and Gossett Mueller Taco Weinman Gerand Griswald Belimo 1 04 INSULATION EXTENSIONS A Provide factory built extensions on all air vents measuring devices gauges thermometers T amp P test plugs strainer drains and etc to allow installation of pipe insulation 1 05 SUBMITTALS A Submit catalogue cuts and shop drawings for each piece of equipment and tank PART 2 PRODUCTS 2 00 AIR SEPARATION DEVICES AND CONTROLS A D HYDRONIC SP 2011 SHW G Bell and Gossett Rolairtrol as or ASL combination tangential air separator and system strainer 125 psig ASME Code constructed Bell and Gossett Airtrol tank fitting Model AFT ATFL or proper size to match tank diameter Line from system tank shall pitch upward to tank 1 4 per foot Automatic air
8. WELLS 6 GLHPS REMOVE EXISTING VALVE AND INSTALL NEW CIRCUIT SETTER BALANCING SIE 7 VALVE B amp G CB 1 1 4 BALANCE VALVI EACH CIRCUIT 20 GPM TVP OF 15 rs P amp T PLUG E P amp T PLUG TYP OF 15 TYP OF 15 LL z lt 2 l l eo 2 6 FLOW METER THREAD O LET 1 1 4 FROM EXISTING 1 1 4 TO EXISTING 1 1 4 EXISTING TEMPERATURE SENSOR GEOTHERMAL FIELD TYPICAL OF 15 GEOTHERMAL FIELD TYPICAL OF 15 EXTEND EXISTING MANIFOLD MINIMUM OF 48 AS REQUIRED TO CONNECT 4 NEW SUPPLY CIRCUITS PROVIDE NECESSARY SUPPORTS EXISTING GEOTHERMAL FIELD TO REMAIN SEE EXISTING DRAWING G M1 FOR EXISTING FIELD LAYOUT AND BOREHOLE NEW CIRCUIT 1 NEW CIRCUIT 2 NEW CIRCUIT 3 NEW CIRCUIT 4 t NEW CIRCUIT 5 RETURN CIRCUITS TYP OF 15 EXTEND EXISTING MANIFOLD MINIMUM OF 48 AS REQUIRED TO CONNECT 4 NEW RETURN CIRCUITS PROVIDE NECESSARY SUPPORTS NUMBERING NEW CIRCUIT 1 NEW CIRCUIT 2 REFER TO CIRCUIT DRAWINGS ON THIS FOR CONTINUATION AND DETAILS OF NEW CIRCUITS 1 2 3 NEW CIRCUIT 3 AND 4 NEW CIRCUIT 4 A INSTALL 3 FLASH PORT IN MANIFOLD THIS AREA WITH PLUG BALL VALVE WHEN WORK IS COMPLETE GROUND LOOP HEAT PUMP GLHP FLOW DIAGRAM NO SCALE NEW CIRCUIT 5 INSTALL 3 FLASH PORT IN MANIFOLD THIS AREA WITH PLUG BALL VALVE WHEN WORK IS COMPLETE FOR CONTINUATI
9. 1000 i57 1975 50 488 Reston Back Roht Du up a l Horizontat Mea oso i59 sao ame 463 4o03 750 620 soe soso eso 9450 236 asos 2653 soo 4371 700 iie i57 1875 843 i029 Reston Lett exons ae e up 34 Horizonte Hoh i50 470 ass 1775 vse 750 5561 sese eso ineo 175 1642 soo 4o88 zoo 937 265 160 101 135 200 360 S32 Lert Roht Exue4 up 36 Horizonte Hoh oe7 155 sio 1700 144i eise 750 sao se47 eso 10097 133 soo 4007 709 956 265 160 1093 150 270 35i Reston Lert Roht ISSUE October 14 2011 up 37 Hortzontat Hoh oez iss sto 144 eise 750 620 s40 sea7 eso 10097 1760 soo 4007 700 956 _ 5 1 60 90 1043 150 270 ast Reston Back eet Sa NOTES 1 DISCONNECT TO BE PROVIDED AND INSTALLED BY THE MANUFACTURER 2 PERFORMANCE IS BASED ON 100 WATER 3 MINIMUM ACCEPTABLE EFFICIENCIES ARE NOTED IN THE SCHEDULE ABOVE EER AND COP VALUES SHEET TITLE 4 MECHANICAL CONTRACTOR SHALL COMPLY WITH MANUFACTURER S CLEARANCE REQUIREMENTS FOR THE TRANE UNITS BASIS OF DESIGN CLEARANCES ARE 18 DN MECHANICA
10. 20 FREEZE PROTECTION INSTALL IN MECHANICAL ROOM 001 INSTALL TWO SENSOR WELLS NEW CIRCUIT SETTER BALANCING VALVE 13 GPM THREE WAY CONTROL VALVE SHALL BE OPEN DURING BUILDING POWER OUTAGE TO ALLOW WATER FLOW THROUGH P 20 P amp T PLUG P amp T PLUG A 2 COPPER PIPE L FLOW METER THREAD 0 LET TEMPERATURE SENSOR TYP 2 COPPER PIPE SOCKET FUSION 1 TO 1 BRASS MALE PIPE FITTING W P amp T PLUG TYPICAL OF 6 CONNECT EXISTING HDPE GEOTHERMAL PIPE TO NEW 2 COPPER MANIFOLD SUPPLY VA TYPICAL OF 3 A CONNECT EXISTING HDPE GEOTHERMAL PIPE TO NEW 2 COPPER MANIFOLD RETURN TYPICAL OF 3 NEW CIRCUIT 3 NO SCALE P 21 FREEZE PROTECTION INSTALL INSTALL TWO SENSOR IN MECHANICAL ROOM 001 WELLS O NEW CIRCUIT SETTER BALANCING VALVE 29 GPM THREE WAY CONTROL VALVE 1 1 2 SHALL BE OPEN DURING BUILDING POWER OUTAGE TO ALLOW WATER FLOW THROUGH P 21 P amp T PLUG NC P amp T PLUG A F P O METER 2 COPPER T 2 COPPER THREAD O LET PIPE PIPE ISOLATION VALVES TYPICAL ON EACH GROUND LOOP SUPPLY AND RETURN PIPING SOCKET FUSION 1 TO 1 BRASS MALE PIPE FITTING W P amp T PLUG TYPICAL OF 14 TEMPERATURE SENSOR TYP A CONNECT EXISTING HDPE GEOTHERMAL PIPE TO NEW 2 COPPER MANIFOLD RETURN TYPICAL OF 7 CONNECT EXISTING HDPE GEOTHERMAL
11. 23 09 23 SYSTEM FOR HVAC Date 11 11 2011 Calibrate and prepare for service each instrument control and accessory equipment furnished under Section 23 09 23 Verify that control wiring is properly connected and free of shorts and ground faults Verify that terminations are tight Enable control systems and verify each input device s calibration Calibrate each device according to manufacturer s recommendations Verify that binary output devices such as relays solenoid valves two position actuators and control valves and magnetic starters operate properly and that normal positions are correct Verify that analog output devices such as I Ps and actuators are functional that start and span are correct and that direction and normal positions are correct Check control valves and automatic dampers to ensure proper action and closure Make necessary adjustments to valve stem and damper blade travel Prepare a log documenting startup testing of each input and output device with technician s initials certifying each device has been tested and calibrated Verify that system operates according to sequences of operation Simulate and observe each operational mode by overriding and varying inputs and schedules Tune PID loops and each control routine that requires tuning Alarms and Interlocks a Check each alarm with an appropriate signal at a value that will trip the alarm b Trip interlocks using field contacts to check logic
12. 550 488 Reston Back Roht EXMO36 ARUINGTON PUBLIC Horizonte eso Hoh 150 470 ess 1775 vse 750 5561 sese eso 1029 175 1642 soo 4o88 zoo 938 ces eo 101 1a35 200 360 Bock Riht EXME4 SCHOOLS up 27 l Horizontat 1320 os3 159 sao san ass an 750 620 s494 ses7 sso 9995 246 3497 ete soo 4048 700 948 i57 1875 sso 488 Reston _ Back Roht EXMEOSG TAYLOR ELEMENTARY up ea Horizonte ost iss sio 144 eise 750 e20 se47 eso 1097 1760 soo 4007 700 956 90 1092 150 270 ast Reston Back Right SEO ION up a0 Horizonte 1075 Med oso 159 S30 3233 750 620 5405 si99 eso 9785 461 2642 soo 464 zoo 977 265 1 60 157 1875 amp se 625 Bock Roht Exu36 2600 North Stuart Street Hortzontat Med oso 159 sao esse l 4002 750 e20 5347 sto eso sos 246 3373 eses soo sosi zoo i000 i57 1975 550 488 Reston Back Roht EXMO3S6 oi up ae Horizontat Mea oso 159 sao ease 4o e20 5347 sto eso soss 246 3373 eses soo 4ost 700
13. Ground Loop Heat Pump listed and labeled prior to leaving the factory Service and caution area labels shall also be placed on the units in their appropriate locations The manufacturer shall field supervise check test and start up of each heat pump A copy of the manufacturer s start up and field service report shall be provided to the Mechanical Engineer and Owner 1 00 SUBMITTALS A F G Submit complete manufacturer s capacity rating data in accordance with ISO ARI 13256 1 GLHP and under conditions shown on the drawings Also submit detailed and dimensioned shop drawings of all equipment furnished Submit shop drawings and product data for manufactured products and assemblies required for this project Indicate water drains and electrical rough in connections on shop drawings Submit manufacturer s installation instructions Operation amp Maintenance Data Submit operation and maintenance data Include manufacturers descriptive literature operating instruction installation instructions and maintenance and repair data Delivery Storage and Handling Deliver products to site per manufacturer s standard terms and conditions Store and protect products per manufacturer s recommendations Protect products from physical damage by leaving factory packing cases in place before installation Submit product data on filtration media highlighting MERV rating Submit product data on refrigerant R 410A refrigerant shall be pro
14. Manual Positioning Operators shall be able to manually position each actuator when the actuator is not powered Non spring return actuators shall have an external manual gear release Spring return actuators with more than 7 N m 60 in Ib torque capacity shall have a manual crank C Control Valves 1 General Select body and trim materials in accordance with manufacturer s recommendations for design conditions and service shown 2 Type Provide two or three way control valves for two position or modulating service as shown 3 Water Valves a Valves providing two position service shall be quick opening Two way valves shall have replaceable disc or ball b Close off Differential Pressure Rating Valve actuator and trim shall provide the following minimum close off pressure ratings i Two way 150 of total system pump head ii Three way 300 of pressure differential between ports A and B at design flow or 100 of total system pump head c Ports Valves providing modulating service shall have equal percentage ports d Sizing i Two position service line size ii Two way modulating service select pressure drop equal to the greatest of twice the pressure drop through heat exchanger load 50 of the pressure difference between supply and return mains or 35 kPa 5 psi iii Three way modulating service select pressure drop equal to the smaller of twice the pressure drop through the coil exchanger load or 35 kPa
15. Space or duct static pressure sensor ERU 1 through ERU 7 6 Smoke detectors ERU 1 through ERU 7 10 7 Microprocessor controller shall include BACnet MSTP communications for building management system interface 1 The interface shall make available all available points used in the onboard controller to the BAS system including any points internal to controller logic The Owner and BAS contractor shall determine what points will be displayed at the front end 2 The interface shall make the following points at a minimum available for command by the BAS 2 1 Unit Start Stop DO 2 2 Unit Discharge Setpoint AO 2 3 Unit Humidity Setpoint if unit includes a dehumidification sequence AO 2 4 Unit Pressure Setpoints space amp discharge pressure AO 2 5 Wheel Start Stop Ability to lockout or override on DO 3 The ERU provider shall provide a complete sequence of operation detailing the decision process of the internal logic in the controller with respect to temperature pressure and humidity control Proprietary sequences for safeties or other non capacity related logic need not be disclosed 11 FIELD ACCESSORIES 1 Provide the manufacturers standard flat 14 curb for ERU 5 only Curb shall be a solid bottom with a minimum of 1 insulation liner for acoustical dampening The roof curbs shall be minimum 14 above roof decking 12 FACTORY VERIFICATION TESTING 12 1 Unit shall be run tested prior to shipment from the factory
16. and a pressure drop of less than 1 PSI at 17 feet per second flow velocity Flow sensor shall have 175 1 turndown ratio Accuracy shall be within 0 5 of actual reading at the calibrated typical velocity and within 2 of reading over a 50 1 turndown from 0 4 to 20 ft s Each sensor shall be individually wet calibrated in a flow laboratory against a primary volumetric standard accurate to within 0 1 and directly traceable to the U S National Institute of Standards and Technology NIST Provide certificate of calibration with each flow meter The sensor shall have integral analog outputs of 0 10 VDC and 4 20 mA linear to within 0 1 of calibrated span for connection to the control system The sensor shall also include three internal frequency outputs top turbine bottom turbine average frequency for commissioning and diagnostic purposes All outputs shall be linear with flow rate The turbine elements shall be made of polypropylene with sapphire jewel bearings and tungsten carbide shafts The flow sensor shall be constructed of plated brass with an aluminum electronics enclosure and gasketed cover The unit shall be provided with hot tap installation in order to be both insertable and removable through a ball valve when the pipe is under pressure 2 08 TEMPERATURE TRANSMITTERS A Provide self contained RTD type temperature transmitters All temperature transmitters shall be packaged mounted and wired where possible The temp
17. but the status is off e Condenser Water Pump Running in Hand Commanded off but the status is on e Condenser Water Pump Runtime Exceeded Status runtime exceeds a user definable limit Cooling Tower VFD Fan Condenser Water Temperature Control The controller shall measure the cooling tower condenser water supply basin temperature and modulate the bypass valve and fan VFD in sequence to maintain setpoints Automated Logic Virginia 23 09 93 B 9 The following setpoints are recommended values All setpoints shall be field adjusted during the commissioning period to meet the requirements of actual field conditions On rising condenser water supplv temperature the controller shall modulate the bvpass valve to maintain setpoint of 78 F adj and the fan VFD to maintain setpoint of 82 F adj Alarms shall be provided as follows e Fan e Failure Commanded on but the status is off e Running in Hand Commanded off but the status is on e Runtime Exceeded Status runtime exceeds a user definable limit e VFD Fault e High Condenser Water Supply Basin Temp If greater than 86 F adj e Low Condenser Water Supply Basin Temp If less than 38 F adj Condenser Water Temperature Monitoring The following temperatures shall be monitored e Condenser water supply temperature e Condenser water return temperature Alarms shall be provided as follows e High Condenser Water Supply Temp If the condenser water supply
18. wells in accordance with Specification Section 232113 33 identification of functioning non functioning wells capping of all geothermal piping after pressure testing and cleaning of the work area State the amount to be added to the Base Bid to provide all work described above ADD Dollars 00 ALTERNATE BID ITEM NO 3 Following removal and disposal of the classroom heat pump units included in the Base Bid the work of Alternate No 3 includes Removal of all supplv and return piping between the points of entrv into the crawl space and the disconnected classroom heat pump unit pressure testing each of three 3 wells in accordance with Specification Section 232113 33 identification of functioning non functioning wells capping of all geothermal piping after pressure testing and cleaning of the work area State the amount to be added to the Base Bid to provide all work described above ADD Dollars 00 ALTERNATE BID ITEM NO 4 Following removal and disposal of the classroom heat pump units included in the Base Bid the work of Alternate No 4 includes Removal of all supplv and return piping between the points of entrv into the crawl space and the disconnected classroom heat pump unit pressure testing each of seven 7 wells in accordance with Specification Section 232113 33 identification of functioning non functioning wells capping of all geothermal piping after pressure testing and cleaning of the work area State the amount
19. 09 23 11 APS Tavlor Renovation DIRECT DIGITAL CONTROL Section 23 09 23 SYSTEM FOR HVAC Date 11 11 2011 PART 3 EXECUTION 3 1 Examination A Thoroughly examine project plans for control device and equipment locations Report discrepancies conflicts or omissions to Architect or Engineer for resolution before starting rough in work B Inspect site to verify that equipment can be installed as shown Report discrepancies conflicts or omissions to Engineer for resolution before starting rough in work C Examine drawings and specifications for work of others Report inadequate headroom or space conditions or other discrepancies to Engineer and obtain written instructions for changes necessary to accommodate Section 23 09 23 work with work of others Controls Contractor shall perform at his expense necessary changes in specified work caused by failure or neglect to report discrepancies 3 2 Protection A Controls Contractor shall protect against and be liable for damage to work and to material caused by Contractor s work or employees B Controls Contractor shall be responsible for work and equipment until inspected tested and accepted 3 3 Coordination A Site 1 Assist in coordinating space conditions to accommodate the work of each trade where work will be installed near or will interfere with work of other trades If installation without coordination causes interference with work of other trades Contractor shall correct cond
20. 230010 GENERAL CONDITIONS MECHANICAL 230519 THERMOMETERS 230520 PRESSURE GAUGE 230523 VALVES 230524 HYDRONIC SPECIALTIES 232113 33 GEOTHERMAL SYSTEM 235216 CONDENSING BOILER 236500 COOLING TOWER 237200 ENERGY RECOVERY HEAT PUMP UNIT 238146 HEAT PUMP SYSTEM CLOSED CIRCUIT TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 SECTION 00420 BID FORM Bid For TAYLOR ELEMENTARY SCHOOL HVAC RENOVATION PROJECT ARLINGTON PUBLIC SCHOOLS VIRGINIA Submit BY MAIL HAND DELIVERY OR EXPRESS CARRIER TO Arlington Public Schools Purchasing Department 4 Floor 1426 N Quincy Street Arlington VA 22207 Gentlemen 1 The undersigned Bidder declares that has informed himself fullv of all conditions pertaining to the work and to the location where the work is to be performed that he has examined the Bid Documents and Contract Documents including the Agreement between Owner and Contractor Conditions of the Contract General and other conditions Instructions to Bidders the Drawings the Specifications all Addenda and all conditions relative to the work to be performed The Bidder proposes and agrees if this Bid is accepted within the number of davs provided for in the PROJECT MANUAL to enter into an Agreement with the OWNER in the form of contract specified for the Contract Price and within the Contract Time indicated in the Bid Documents to furnish all nece
21. A Geothermal System Installer Qualifications The persons performing geothermal work shall be personally accredited by IGSHPA personally licensed as a geothermal installer personally experienced in geothermal work and shall have been regularly employed by a Company performing geothermal work for a minimum of 3 years B Geothermal System Supervisor s Qualifications The persons overseeing the geothermal work shall be personally accredited by IGSHPA personally licensed as a geothermal installer or piping personally experienced in geothermal work and shall have been regularly employed by a Company performing geothermal work for a minimum of 5 years C Geothermal System Supplier Qualifications The contractor shall have completed geothermal work on at least 3 projects of similar size and complexity within the last 5 years D Regulatory Requirements 1 Perform factory testing of factory fabricated equipment in complete accordance with the agencies having jurisdiction 2 Perform field testing of piping systems in complete accordance with the local utilities and other agencies having jurisdiction and as specified 1 4 PROJECT CONDITIONS A Protection During test work protect controls gages and accessories which are not designed to withstand test procedures Do not utilize permanently installed gages for field testing of systems B The existing school utilizes the closed loop geothermal system to provide the condenser water to the he
22. Contractor Loss of time on the project from such violations will not be tolerated 1 8 WATER SUPPLV A The Contractor shall supplv potable water as necessarv to perform the work The equipment will include pumps water trucks or trailers hoses storage tanks and all other items necessary to provide an adequate supply of potable water The source of water shall be subject to the approval of the Owner B If excessive water quantity is presented during geothermal drilling the geothermal contractor shall provide the water containment plan which shall be approved by the Mechanical contractor and the Owner The geothermal contractor is responsible for execution of the water containment plan PART 2 PRODUCTS 2 1 PIPE amp PIPE FITTINGS A High Density Polyethylene PE Pipe and Fittings The piping shall be PE3408 4710 high density polyethylene Resistance to environmental stress cracking is critical to long life expectancy Therefore as a more stringent requirement the piping shall experience zero failures FO after 5 000 hours under condition AC 100 reagent at 100 C when tested in accordance with ASTM D1693 Standard Test Method for Environmental Stress Cracking of Ethylene Plastics A minimum 25 year limited warranty in writing must be issued by the pipe manufacturer U type fittings shall be shop fabricated under quality controlled conditions of the same material designation B Fittings 1 Butt fusion type ASTM D3281 2 Sock
23. Hose lines and fittings shall be installed by Contractor in accordance with manufacturer s recommendations The Contractor shall install the hose assemblies to temporarily direct from the supply to the return piping where each air conditioner will be located in order to allow circulation of water through the entire pipe loop for thorough flushing of the water system The Contractor shall flush the entire water loop free of dirt weld slag and other debris to the Engineer s satisfaction before installing any air conditioner Each heat pump will have the following piping installation 1 Suppiv Slide Ball valve with pressure temperature port two or three foot hose with MPT adapter strainer with plug blow down and pipe reducer fitting 2 Return Slide Ball valve with pressure temperature port and memory stop automatic balancing device with two pressure ports two or three foot hose with MPT adapter and pipe reducer fitting 3 All WSHP will have a clear vinyl molded P trap and condensate hose 3 02 CLOSED LOOP HEAT PUMP SYSTEM CLEANING AND FLUSHING A Circulation start up before cleaning and flushing 1 Before the piping system is complete the contractor shall connect supply and return runouts together at each WSHP location Connection of supply and return runouts shall be made by the Contractor with short lengths of high pressure rubber hose and brass fittings One fitting shall be swivel type to eliminate turning fittings in
24. None in this project server is existing 2 4 Controller Software A Building and energy management application software shall reside and operate in system controllers Applications shall be editable through operator workstation web browser interface or engineering workstation B System Security See Paragraph 2 3 F 5 Security and Paragraph 2 3 F 15 c Operator Activity 2 5 Controllers A General Provide Building Controllers BC Advanced Application Controllers AAC Application Specific Controllers ASC Smart Actuators SA and Smart Sensors SS as required to achieve performance specified in Section 23 09 23 Article 1 9 System Performance Every device in the system which executes control logic and directly controls HVAC equipment must conform to a standard BACnet Device profile as specified in ANSI ASHRAE 135 BACnet Annex L Unless otherwise specified Automated Logic Virginia 23 09 23 7 APS Tavlor Renovation DIRECT DIGITAL CONTROL Section 23 09 23 SYSTEM FOR HVAC Date 11 11 2011 hardwired actuators and sensors may be used in lieu of BACnet Smart Actuators and Smart Sensors B BACnet 1 All interfaces if required shall be BACnet unless specifically stated otherwise 2 6 Input and Output Interface A General Hard wire input and output points to BCs AACs ASCs or SAs B Protection Shorting an input or output point to itself to another point or to ground shall cause no controller damage Input or
25. Owner and Discipline Heating Ventilation and Air Conditioning or Plumbing Electrical etc will be glued in the front of each manual C An index will be included with Section tabs for each subject included D Manuals will be submitted for approval E The manuals shall include as a minimum the following for all equipment and systems installed 1 Complete and correct manufacturer s shop drawings and submittal data All model numbers equipment capacities and characteristics will be clearly indicated Each piece of equipment will be identified the same as identified on the contract drawings and its location shall be indexed to a key plan 2 Manufacturer s installation manual Service manual and parts list 3 Start up and shutdown instructions for all major seasonal changeover instructions 4 Trouble shooting instructions 5 Valve charts and electric motor schedules 6 Lubrication time schedule for all equipment with schedule of lubricants to be used T Belt sizes types lengths and belt number 8 Description of each system installed and operating instructions 9 As installed control diagrams and description of sequence of operation by the Control Manufacturer 10 Complete as installed color coded wiring diagrams of refrigeration system and all electrical connections of other mechanical equipment 11 Copies of pipe ductwork and equipment identification charts 12 Manufacturer s guarantees or warranties GE
26. Static Pressure Pipe high pressure tap to duct using a pitot tube Make pressure tap connections according to manufacturer s recommendations 2 Return Duct Static Pressure Pipe high pressure tap to duct using a pitot tube Make pressure tap connections according to manufacturer s recommendations Automated Logic Virginia 23 09 23 14 APS Tavlor Renovation DIRECT DIGITAL CONTROL Section 23 09 23 SYSTEM FOR HVAC Date 11 11 2011 3 Building Static Pressure Pipe pressure sensor s low pressure port to the static pressure port located on the outside of the building through a high volume accumulator Pipe high pressure port to a location behind a thermostat cover 4 Piping to pressure transducer pressure ports shall contain a capped test port adjacent to transducer 5 Pressure transducers except those controlling VAV boxes shall be located in control panels not on monitored equipment or on ductwork Mount transducers in a vibration free location accessible for service without use of ladders or special equipment 6 Mount gauge tees adjacent to air and water differential pressure taps Install shut off valves before tee for water gauges J Smoke detectors freezestats high pressure cut offs and other safety switches shall be hard wired to de energize equipment as described in the sequence of operation Switches shall require manual reset Provide contacts that allow DDC software to monitor safety switch status 3 12 Actuators A Ge
27. Status x Boiler 1 Low Water Level LA Boiler 2 Alarm Status EN Boiler 2 Low Water Level ESSEN x Hot Water Pump Status x Circulation Pump Status typ of 4 LA Boiler 1 Status Px Boiler 2 Status Px Hot Water Pump Start Stop x Boiler 1 Enable Boiler 2 Enable gt c 3 B 1 lt 3 5 Q Q 23 09 93 B 8 Boiler 1 Failure Boiler 2 Failure Boiler 1 Running in Hand AM x Boiler 2 Running in Hand Lead Boiler Failure Boiler 2 Runtime Exceeded Boiler 1 Low Hot Water Supply Temp Boiler 2 High Hot Water Supply Temp Boiler 2 Low Hot Water Supply Temp COOLING TOWER SECTION Cooling Tower Run Conditions The cooling tower shall be enabled to run whenever the outside air temperature is greater than 54 F adj Vibration Switch The cooling tower shall shut down and an alarm generated upon receiving a vibration switch status Condenser Water Pump The lead condenser water pump shall run anytime the cooling tower is called to run The lag condenser water pump shall start on lead pump failure The condenser water pump shall start prior to the CT being enabled and shall stop only after the CT is disabled The condenser water pump shall therefore have Auser adjustable delay on start e AND a user adjustable delay on stop Alarms shall be provided as follows e Condenser Water Pump Failure Commanded on
28. Substantial Completion of the Project August 13 2012 b Revise paragraph 5 7 to read Final Completion of the Project August 31 2012 SECTION 00420 BID FORM a Revise paragraph 8 a 5 to read Substantial Completion of the Project August 13 2012 Revise paragraph 8 a 6 to read Final Completion of the Project August 31 2012 Revise paragraph 13 BID ITEM 3 see attached specification Add BID ITEM 4 UNIT PRICES to paragraph 13 see attached specification Boc SECTION 024119 SELECTIVE DEMOLITION ADDENDUM 2 TO BID 37FY12 Page 2 of 3 a Revise paragraph 3 3 B 4 to read Cover and protect furniture furnishings and equipment that have not been removed including wall mounted interactive white boards and ceiling mounted projectors SECTION 230010 GENERAL CONDITIONS MECHANICAL SECTION 230519 THERMOMETERS SECTION 230520 PRESSURE GAUGE SECTION 230523 VALVES SECTION 230524 HYDRONIC SPECIALTIES SECTION 232113 33 GEOTHERMAL SYSTEM SECTION 235216 CONDENSING BOILER SECTION 236500 COOLING TOWER SECTION 237200 ENERGY RECOVERY HEAT PUMP UNIT SECTION 238146 HEAT PUMP SYSTEM CLOSED CIRCUIT SPECIFICATIONS UNDER SEPARATE CONTRACT FULL SPEC SECTIONS SEE ATTACHMENT C SECTION 230923 DIRECT DIGITAL CONTROL SYSTEM FOR HVAC UNDER SEPARATE CONTRACT a Added in its entirety SECTION 230993 SEQUENCE OF OPERATIONS FOR HVAC CONTROLS UNDER SEPARATE CONTRACT
29. UNIT 1 GENERAL 1 1 Provide outside air units as manufactured by Valent Engineered Air Mammoth Aaon or approved equal 1 2 Project is based on the specified equipment Valent Any additional costs associated with using alternate manufacturer s equipment shall be borne by the installing contractor or equipment provider 1 3 Equipment shall be completely assembled piped internally wired and computer run tested at the factory Equipment Manufacturer shall provide computer test results upon request of owner It shall be both ETL and ISO ARI 13256 1 Standard ISO Ground Loop Heat Pump listed and labeled prior to leaving the factory Service and caution area labels shall also be placed on the units in their appropriate locations 2 WARRANTY 2 1 Unit shall be subject to manufacturer s standard warranty for the following periods 1 Overall unit 12 months from substantial completion but no more than 18 months from shipment 2 Compressors 60 months substantial completion but no more than 66 months from shipment 3 Energy recovery wheel 60 months from substantial completion but no more than 66 months from shipment 3 CASING CONSTRUCTION 3 1 Units shall be constructed for outdoor installation Structural supports for the Energy Recovery Units ERU shown on the construction documents drawings and shall be provided and installed by the mechanical contractor Manufacturer shall provide the roof curb for ERU 5 only 3 2 Base 1 Base
30. a Added in its entirety ATTACHMENTS ATTACHMENT A FULL SIZE SHEETS M2 1 M2 2 M3 1 M5 1 ATTACHMENT B FULL SPECIFICATION SECTIONS 00420 BID FORM 230923 DIRECT DIGITAL CONTROL SYSTEM FOR HVAC 230993 SEQUENCE OF OPERATIONS FOR HVAC CONTROLS 230010 GENERAL CONDITIONS MECHANICAL 230519 THERMOMETERS 230520 PRESSURE GAUGE 230523 VALVES 230524 HYDRONIC SPECIALTIES 232113 33 GEOTHERMAL SYSTEM 235216 CONDENSING BOILER 236500 COOLING TOWER 237200 ENERGY RECOVERY HEAT PUMP UNIT 238146 HEAT PUMP SYSTEM CLOSED CIRCUIT ATTACHMENT C FULL SPECIFICATION SECTIONS UNDER SEPARATE CONTRACT 230923 DIRECT DIGITAL CONTROL SYSTEM FOR HVAC 230993 SEQUENCE OF OPERATIONS FOR HVAC CONTROLS END OF ADDENDUM 2 ADDENDUM 2 TO BID 37FY12 Page 3 of 3 ATTACHMENT A FULL SIZE SHEETS M2 1 M2 2 M3 1 M5 1 2 28 2011 2 20 39 PM Y Arlington PS 3111 003 00 Arlington Taylor ES Geothermal Well Test 15 BIM 05 A 311100300 Taylor ES A11 CENTRAL rvt
31. be delivered to the owner upon completion of the work in a reproducible and electronic format An additional set shall be given to the engineer for his records Three bound manuals All required testing and balancing reports Framed under glass complete diagrams of operating instructions for air conditioning and heating controls including new and existing equipment Framed under glass complete valve charts Electric Motor Schedule Before final inspection of the project submit a schedule listing each motor connected regardless of under which division of these specifications the motor was furnished Include the following information for each motor Location room number area etc Description of motor duty Air unit fan motor refrigeration compressor motor geothermal water pump motor for examples Type of coupling Direct drive V belt flexible coupling etc belt specification Motor manufacturer s name and serial number of motor Motor rated horsepower Motor speed rpm Motor nameplate ratings voltage number of phases temperature rise Nameplate amperage at connected voltage Starter and heater manufacturer size and rating Type of motor bearing type and lubrication instructions Catalog information for starters as follows Manufacturer s name and catalog number GENERAL CONDITIONS MECHANICAL 230010 8 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS Rating Manuals as described in these specific
32. be included in conduit containing wiring for alternating current 2 09 LOW PRESSURE PIPELINE STRAINERS A Y type with bronze or cast iron body screwed connections in sizes 2 through 2 and flanged ends in sizes 22 and larger 125 psig working pressure Strainer shall have screwed or bolted screen retainer with blowdown fitted with pipe plug type 304 stainless steel screen with 1 32 perforations furnished in sizes through 2 and perforated brass screen 3 64 openings for sizes 22 and larger B Strainers shall have a gate valve and hose connection on the blowdown C Manufacturers Mueller Armstrong Illinois Hoffman Sarco or equal PART 3 EXECUTION 3 01 INSTALLATION A Support air separation tanks and expansion from building structure Provide hangers bases steel angle supports etc as required B Install all devices in accordance with manufacturer s written instructions C Coordinate with control specifications sections 230900 and 230993 END OF SECTION HVDRONIC SPECIALTIES 230524 4 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 SECTION 232113 33 GEOTHERMAL SYSTEM PART 1 GENERAL 1 1 REFERENCES A International Ground Source Heat Pump Association IGSHPA Installation Manuals 1 2 SUBMITTALS A Submittals Package Submit product data and qualitv control submittals specified below at the same time as a package B Prod
33. by failure to comply with this provision shall be replaced at no cost Utilities as mentioned in this division of the specifications shall include water sewers gas and other piping systems necessary to the operation of any new or existing systems and equipment 3 04 NOISE AND VIBRATION A B Mechanical equipment and devices shall operate without objectionable noise and vibration being transmitted to occupied portions of the building or any part of the building structure by apparatus piping ductwork conduits or other parts of the mechanical work Secure and brace all piping and ductwork provide flexible connections vibration isolators or other devices where indicated or required to prevent the transmission of noise and vibration to the building Air distribution devices air moving units light fixture air diffusers fans thermostats and other such equipment that may produce sound or vibration either outside or within the occupied space of the building shall as a minimum requirement conform to the installation details and recommendations in the ASHRAE Handbook Applications 3 05 ACCESS PANELS A Provide metal access panels at all points where valves traps cleanouts etc are concealed in walls floors or ceilings Metal access panels shall be labeled with the same fire protection rating as the wall floor or ceiling in which it is being installed GENERAL CONDITIONS MECHANICAL 230010 6 2011 SHW GROUP ARCHITEC
34. does not affect a proper seal A burner flame observation port shall be provided The burner shall be a premix design and constructed of high temperature stainless steel with a woven metal fiber outer covering to provide modulating firing rates The BOILER shall be supplied with a gas valve designed with negative pressure regulation and be equipped with a variable speed blower system to precisely control the fuel air mixture to provide modulating boiler firing rates MULTIPLE CONDENSING BOILER HEATING PLANT 235216 1 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 for maximum efficiency The BOILER shall operate in a safe condition at a derated output with gas supply pressures as low as 4 inches of water column The BOILER shall utilize a 24 VAC control circuit and components The control system shall have a Liquid Crystal touch screen display for boiler set up boiler status and boiler diagnostics All components shall be easily accessed and serviceable from the front of the jacket The BOILER shall be equipped with a temperature pressure gauge high limit temperature control with manual reset ASME certified pressure relief valve set for 50 psi outlet water temperature sensor return water temperature sensor outdoor air sensor flue temperature sensor high and low gas pressure switches low water cut off with manual reset and a condensate trap for the he
35. ends Lift check valves shall be Crane No 366 1 2 iron body Monel seat and disc in horizontal lines and No 368 bronze trimmed in vertical lines Pressure reducing and relief valves shall be designed for 150 psi WP and set as required Pressure relief valves shall be in accordance with ASME Code with discharge piped full size to floor drain Pressure reducing valves shall maintain a constant downstream pressure regardless of varying inlet side Install a strainer and pressure gauge on inlet side and a pressure gauge on outlet side install a 1 valved by pass Automatic Flow Control Valves Valves shall be Isolator R Isolator MV and K Griswold or Belimo automatic pressure compensating flow control valves or approved equal Valves shall be factory set and shall automatically limit the rate of flow to required engineered capacity within 5 accuracy over an operation pressure differential The control mechanism of the valve shall consist of a self contained open chamber cartridge assembly with unobstructed flow passages that eliminate accumulation of particles and debris Cartridge AISI Type 304 stainless steel AISI 230523 2 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 Type 17 7 PH stainless steel spring Body SS 1 1 2 forged brass 1 12 L 3 cast brass End connections brass Valve shall have a thin orifice plate for
36. energy user Primary Hot Water Temperature Monitoring The following temperatures shall be monitored e Primary hot water supply e Primary hot water return Alarms shall be provided as follows e High Primary Hot Water Supply Temp If greater than 200 F adj Automated Logic Virginia 23 09 93 B 7 e Low Primary Hot Water Supply Temp If less than 100 F Boiler 1 Hot Water Temperature Monitoring The following temperatures shall be monitored e Boiler 1 hot water supply e Boiler 1 hot water return Alarms shall be provided as follows e High Hot Water Supply Temp If greater than 200 F adj e Low Hot Water Supply Temp If less than 100 F adj Boiler 2 Hot Water Temperature Monitoring The following temperatures shall be monitored e Boiler 2 hot water supply e Boiler 2 hot water return Alarms shall be provided as follows e High Hot Water Supply Temp If greater than 200 F adj e Low Hot Water Supply Temp If less than 100 F agj Hardware Points Software Points Point Name Al AO BI AV BV Sched Trend Primary Hot Water Return Temp x d Primary Hot Water Supply Temp x w Boiler 1 Hot Water Return Temp x Boiler 1 Hot Water Supply Temp x x Boiler 2 Hot Water Return Temp Boiler 2 Hot Water Supply Temp Boiler 1 Hot Water Supply Temp Setpoint Reset x E Boiler 2 Hot Water Supply Temp Setpoint Reset x a Alarm Show On Graphic Boiler 1 Alarm
37. equipment in readily accessible locations as defined by National Electrical Code NEC Chapter 1 Article 100 Part A 3 5 Field Quality Control A Work materials and equipment shall comply with rules and regulations of applicable local state and federal codes and ordinances as identified in Section 23 09 23 Article 1 8 Codes and Standards B Continually monitor field installation for code compliance and workmanship quality 3 6 Existing Equipment A Wiring Interconnecting control wiring shall be removed and shall become Contractor s property unless specifically noted or shown to be reused B Repair Unless otherwise directed Contractor is not responsible for repair or replacement of existing energy equipment and systems valves dampers or actuators Notify Engineer in writing immediately of existing equipment that requires maintenance 3 7 Wiring A Control and interlock wiring and installation shall comply with national and local electrical codes Division 26 and manufacturer s recommendations Where the requirements of Section 23 09 23 differ from Division 26 Section 23 09 23 shall take precedence B NEC Class 1 line voltage wiring shall be UL listed in approved raceway as specified by NEC and Division 26 Low voltage wiring shall meet NEC Class 2 requirements Subfuse low voltage power circuits as required to meet Class 2 current limit NEC Class 2 current limited wires not in raceway but in concealed and acces
38. for horizontal ceiling mounted units Hanging bracket shall be capable of receiving rubber isolation and come factory mounted to the unit C Controls Coordinate with the control specifications sections 230900 and 230993 The control system will be installed under separate contract between the Owner and Automated Logic ALC HPU s control and control sequence should be coordinated between the manufacturer ALC and the Owner Any changes to the HPU s control shall be executed under the AL C Owner contract The controller shall provide features listed below 1 Random start of all water source heat pumps 2 Anti short cycle protection shall prevent rapid cycling of the compressor during changeover from heat to cooling or vice a versus 3 Condensate overflow safeties 4 Fan status and filter timer 5 Ability to control to four setpoints occupied occupied standby occupied bypass timed override and unoccupied 6 Illuminated LEDs on the unit controller to show status and diagnostic information Unit on alarm conditions and communication status 7 Provide field service interface for diagnostic and troubleshooting purposes D Below is the list of points that shall be communicated to the building automation system BAS from the individual WSHP s via a single twisted wire pair 1 Unit status 2 Space setpoint 3 Unit alarms with manual reset include high pressure low pressure and condensate overflow 4 Unit alarms with a
39. general contractor will provide heat to maintain the building above freezing throughout the construction period 1 08 GUARANTEE A The Contractor shall guarantee that all work performed and all materials and equipment installed by him are free from defects He shall repair or replace any defective equipment materials or workmanship free of cost to the Owner for a period of two 2 years from date of acceptance upon notice from the Architect PART 2 PRODUCTS 2 01 SUBSTITUTIONS A The materials or products specified herein and or indicated on the drawings by trade names manufacturer s names or catalog numbers establish the quality of materials or products to be furnished and shall be the basis of each bid Contracts will be awarded on that basis Substitutions may be permitted in accordance with Division 1 requirements 2 02 STANDARDS FOR MATERIALS AND EQUIPMENT A Materials and equipment shall be new unless specifically exempt B Like materials or equipment shall be the product of one manufacturer C Materials and equipment furnished under this specification shall be the standard products of manufacturers regularly engaged in the production of such materials and equipment and shall be the manufacturer s latest standard design D Where Underwriters Laboratories Inc Standards are recommended or required all materials and equipment shall be approved bv them and shall bear the U L label E Third Party Certification All pac
40. of the casing with a captured FPT fitting for field piping Sound Attenuation The enhanced sound attenuation package shall be applied as a standard feature in the product design The sound reduction package shall include a vibration isolation to the compressor and water to refrigerant coil a second stage of vibration isolation to the compressor base pan heavy gauge base assembly insulated metal compressor enclosure and maximum sized return air opening and filler sizing Unit sound power data shall be included in submittal packet for evaluation The data shall be rated in accordance with ARI 260 If units other than the basis of design units are provided and a sound problem develops the contractor shall provide the required sound attenuation at no additional expense to the owner PART 3 INSTALLATION 3 01 WATER CONNECTIONS A Manufacturer shall furnish hose lines and all necessary brass fittings for connection of heat pumps to piping runouts as detailed on drawings Hose shall be Metraflex Elasto Flex HEAT PUMP SYSTEM CLOSED CIRCUIT TYPE GEOTHERMAL SYSTEM 238146 3 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAVLOR ELEMENTARV SGHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 Connectors with nontoxic polymer tube with galvanized steel braid and rust resistant connectors male and female swivel Hose shall be constructed for 185 psi working pressure and 740 psi burst pressure 20 to 230F temperature range
41. other companies or person that could be considered as a conflict of interest or a potential conflict of interest to Arlington Public Schools pertaining to any and all work or services to be performed as a result of this request and any resulting contract with Arlington Public Schools By Name Title Date BID FORM 00420 6 TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 14 CONTACT FOR ADMINISTRATION NAME 15 BID FORM ADDRESS Office TELEPHONE NUMBER Office FAX NUMBER FULL LEGAL NAME OF BIDDER Remittance Address If different ADDRESS PHONE _ FAX DATE TAX ID NUMBER EIN SSN EMAIL ADDRESS STATE CORPORATION COMMISSION SCC IDENTIFICATION NUMBER Under paragraph 1 Contractor Registration of Section 00111 Instruction to Bidders the Bidder agrees if this Bid is accepted by Arlington Public Schools for such services and or items that the Bidder has met the requirements of the Virginia Code Section 2 2 4311 2 Please complete the following by checking the appropriate line that applies and providing the requested information 1 Bidder is a Virginia business entity organized and authorized to transact business in Virginia by the SCC The bidder s identification number issued by the SCC is The SCC number is NOT your federal tax Identification number 2 Bidder is an out of state foreign business entity that is authorized to transact bu
42. output point contact with up to 24 V for any duration shall cause no controller damage 2 7 Power Supplies And Line Filtering A Power Supplies Control transformers shall be UL listed Furnish Class 2 current limiting type or furnish over current protection in primary and secondary circuits for Class 2 service in accordance with NEC requirements Limit connected loads to 80 of rated capacity 2 8 Auxiliary Control Devices A Motorized Control Dampers 1 Type Control dampers shall have linear flow characteristics and shall be parallel or opposed blade type as specified below or as scheduled on drawings a Outdoor and return air mixing dampers and face and bypass dampers shall be parallel blade and shall direct airstreams toward each other b Other modulating dampers shall be opposed blade c Two position shutoff dampers shall be parallel or opposed blade with blade and side seals 2 Frame Damper frames shall be 2 38 mm 13 gauge galvanized steel channel or 3 175 mm 1 8 in extruded aluminum with reinforced corner bracing 3 Blades Damper blades shall not exceed 20 cm 8 in in width or 125 cm 48 in in length Blades shall be suitable for medium velocity 10 m s 2000 fpm performance Blades shall be not less than 1 5875 mm 16 gauge 4 Shaft Bearings Damper shaft bearings shall be as recommended by manufacturer for application oil impregnated sintered bronze or better 5 Seals Blade edges and frame top and
43. repeated System shall then be drained completely and refilled with fresh water After system has been completely cleaned as specified herein it shall be tested by litmus paper or other dependable method and left on slightly alkaline side pH 7 5 If system is still on acid side cleaning by use of trisodium phosphate shall be repeated Supplemental heater and the high limit control shall be reset at this time System Additives the subcontractor shall not add any water treatment chemicals or at any time stop leak compounds to the system 3 04 EQUIPMENT MANUFACTURER S ACKNOWLEDGMENT The manufacturer of the heat pumps must acknowledge on his submittal data that his equipment will properly interface with all the other systems in the building including the hydronic mechanical system electrical system and the energy management and temperature controls systems HEAT PUMP CONDENSER WATER PIPING FLUSHING CERTIFICATION We the undersigned have witnessed the clearing and flushing of the hydronic heat pump closed loop piping system and certify that the effluent is running clear and free of debris Initial Flushing Trisodium Phosphate Flush General Contractor General Contractor print print signed signed date date Mechanical Contractor Mechanical Contractor print print signed signed date date Architect Architect print print HEAT PUMP SYSTEM CLOSED CIRCUI
44. required by provisions of ASME Code PART 2 PRODUCTS 2 1 BOILER CONSTRUCTION A The BOILER shall bear the ASME H stamp for 160 psi working pressure and shall be National Board listed There shall be no banding material bolts gaskets or O rings in the header configuration The BOILER shall have a 316L stainless steel heat exchanger The combustion chamber shall be designed to drain condensation to the bottom of the heat exchanger assembly including a condensate trap The complete heat exchanger assembly shall carry a ten 10 year limited warranty The BOILER shall be certified and listed by C S A International under the latest edition of the harmonized ANSI Z21 13 test standard for the U S and Canada The BOILER shall comply with the energy efficiency requirements of the latest edition of the ASHRAE 90 1 Standard and the minimum efficiency requirements of the latest edition of the ASHRAE 103 Standard The BOILER shall operate at a minimum of 94 thermal efficiency at full fire on 1 000 000 1 300 000 and 1 500 000 Btu hr models All models shall operate up to 98 thermal efficiency with return water temperatures at 90 F or below The BOILER shall be certified for indoor installation The BOILER shall be constructed with a heavy gauge steel jacket assembly primed and pre painted on both sides The combustion chamber shall be sealed and completely enclosed independent of the outer jacket assembly so that integrity of the outer jacket
45. stop The pumps shall be called to run and staged by the internal boiler controls Boiler Lead Standby Operation The two boilers shall operate in a lead standby fashion when called to run and flow is proven e lead boiler shall run first e On failure of the lead boiler the standby boiler shall run and the lead boiler shall turn off The designated lead boiler shall rotate upon one of the following conditions user selectable manually through a software switch if boiler runtime adj is exceeded daily weekly monthly Alarms shall be provided as follows e Boiler 1 e Failure Commanded on but the status is off e Running in Hand Commanded off but the status is on e Runtime Exceeded Status runtime exceeds a user definable limit e Boiler 2 e Failure Commanded on but the status is off e Running in Hand Commanded off but the status is on e Runtime Exceeded Status runtime exceeds a user definable limit e Lead Boiler Failure The lead boiler is in failure and the standby boiler is on Hot Water Supply Temperature Setpoint Reset The hot water supply temperature setpoint shall reset using a trim and respond algorithm based on heating requirements As the facility s hot water valves open beyond a user definable threshold 90 open typ the setpoint shall reset to a higher value adj Once the hot water coils are satisfied valves closing then the setpoint shall gradually lower over time to reduce heating
46. temperature is greater than 86 F adj e Low Condenser Water Supply Temp If the condenser water supply temperature is less than 65 F adj e High Condenser Water Return Temp If the condenser water return temperature is greater than 100 F adj e Low Condenser Water Return Temp If the condenser water return temperature is less than 75 F adj Hardware Points Software Points Point Name Al Bv sched Trend JAlarm Show On Graphic Condenser Water Supply Basin Temp x x x Condenser Water Return Temp x x Condenser Water Supply Temp x Fan VFD Speed Vibration Status Condenser Water Pump 2 Status Condenser Water Pump 2 Status Fan Status Fan VFD Fault Condenser Water Pump Start Stop Automated Logic Virginia 23 09 93 B 10 Point Name Condenser Water Pump Start Stop Hardware Points Software Points Sched Trend JAlarm Show On Graphic x x Fan Start Stop Outside Air Temp Condenser Water Pump Failure Condenser Water Pump Running in Hand Condenser Water Pump Runtime Exceeded Low Condenser Water Supply Basin Temp High Condenser Water Supply Basin Temp Fan Failure Fan in Hand Fan Runtime Exceeded High Condenser Water Return Temp Low Condenser Water Return Temp High Condenser Water Supply Temp Low Condenser Water Supply Temp Automated Logic Virginia 23 09 93 B 11 1 4 Water Sou
47. to be added to the Base Bid to provide all work described above ADD Dollars 00 ALTERNATE BID ITEM NO 5 Following removal and disposal of the classroom heat pump units included in the Base Bid the work of Alternate No 5 includes Removal of all supplv and return piping between the points of entrv into the classroom and the disconnected classroom heat pump unit pressure testing each of nine 9 wells in accordance with Specification Section 232113 33 identification of functioning non functioning wells capping of all geothermal piping after pressure testing and cleaning of the work area State the amount to be added to the Base Bid to provide all work described above ADD Dollars 00 BID FORM 00420 5 TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 BID ITEM 4 UNIT PRICES The bidder is required to supply unit costs for the work in the Alternate Bid Items Prices given shall apply to the deductions or additions to the work and shall include the item installation costs Failure to quote unit prices may result in the rejection of the bid The Owner reserves the right to delete unit prices from the executed contract that are deemed unreasonable UNIT PRICE NO 1 CIRCUIT 1 4 ALTERNATE BID ITEMS 1 4 Provide all materials and labor required to connect existing geothermal piping in crawl space capped off and identified by scope of work required by Alternate Bid to new supply and r
48. to minimize costs to Owner that are related to any disruptions in any part of the Work resulting from unforeseeable conditions which may be encountered and Work changes or additions which may be made Bidder understands that the award of contract if any will be made on the basis of the Total Bid Amount unless specifically stated otherwise Bidder understands that upon award of Contract all items specified in the Bid Documents shall be furnished unless an Or Equal or Substitute Item is accepted by Owner in accordance with paragraph 10 Substitutions Section 10 Instructions to Bidders The Bidder agrees to bear full cost of maintaining the Work until final acceptance of the Work is approved as provided by the Contract This Bid will remain subject to acceptance for sixty 60 days after the day of the Bid opening Owner may cancel this Invitation to Bid and to reject any and all Bids received 8 Bidder agrees to the requirements for substantial completion final completion and liquidated damages as follows a BID FORM The Work will be commenced in accordance with the Contract Documents and will have the following milestone dates 1 long lead mechanical equipment orders confirmed February 15 2012 00420 2 TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 10 11 N Contractor Access to on site exterior staging and storage area March 1 2012 Begin work in boi
49. to the ERU s control shall be executed under the ALC Owner contract 10 1 Units shall include factory supplied mounted wired and tested stand alone microprocessor controls ENERGY RECOVERY HEAT PUMP UNIT 237200 4 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 10 2 Microprocessor controller shall be factory programmed for discharge air control and use an internal 7 day time clock 10 3 Microprocessor controller shall be mounted in a weather proof enclosure and accessible without exposing the operator to high voltage wiring or having to turn off or circumvent the main disconnect 10 4 Microprocessor controller shall include local liquid crystal display LCD for user interface 10 5 The following sensors shall be factory supplied mounted and wired inside the unit 1 Outdoor air humidity sensor 2 Outdoor air temperature sensor 3 Evaporator coil leaving air temperature sensor 4 Supply air filter pressure monitoring 5 Energy wheel rotation sensor 10 6 The following devices shall be factory supplied but shipped loose and require field installation and wiring 1 Wall mounted room air temperature sensor with manual adjuster ERU 6 and ERU 7 only 2 Wall mounted or return air humidity sensor ERU 6 and ERU 7 only 3 Supply air temp temperature sensor ERU 1 through ERU 5 4 Wall mounted CO2 sensor ERU 6 and ERU 7 only 5
50. vents No 7 with overflow connector and 1 4 OD copper tubing to floor drain Install in all high points in the system Manual air vents Crane Co No 702 1 4 level handle petcocks ECIALTIES 230524 1 ROUP ARCHITECTS ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 2 02 2 03 2 04 2 05 2 06 FLOW MEASUREMENT DEVICES A Data Industrial impeller flow sensors with non magnetic sensing mechanism PUMP SUCTION DIFFUSERS A B Provide suction diffusers on the suction side of centrifugal pumps as indicated on the drawings Size shall match pump suction Units shall have angle body inlet vanes combination diffuser strainer orifice cylinder with 3 16 diameter openings for pump protection A permanent magnet shall be located within the flow stream and shall be removable for cleaning The orifice cylinder shall be equipped with a disposable fine mesh strainer which shall be removed after system start up The orifice cylinder shall be designed to withstand the maximum shutoff head pressure differential of the pump Unit shall have adjustable support foot Units shall be suitable for working pressure to 175 psi and temperature to 300 F Manufacturers Bell amp Gossett Mueller Taco Armstrong TRIPLE DUTY CHECK VALVES A B Provide triple duty combination check balancing shutoff valves as indicated on the drawings Valves shall be angle or strai
51. whenever the OA temp drops below 35 degrees and there are no zones calling for water flow The bvpass valve shall open whenever the pump is called to run Well Field BTU Monitoring Each of the well fields 1 existing 5 new shall be monitored for supplv temperature return temperature and flow The total BTU supplied bv each field shall be calculated Hardware Points Software Points Loop Water Supplv Temp x x Loop Water Return Temp Loop Water Differential Pressure x 3 Loop Water Pump 1 VFD Speed Loop Water Pump 2 VFD Speed Loop Water Pump 1 VFD Fault Loop Water Pump 2 VFD Fault Loop Water Pump 1 Status Loop Water Pump 2 Status Loop Water Pump 1 Start Stop Loop Water Pump 2 Start Stop x Loop Water Differential Pressure Setpoint Loop Water Pump 1 Failure Loop Water Pump 1 Running in Hand Loop Water Pump 1 Runtime Exceeded Loop Water Pump 2 Failure Loop Water Pump 2 Running in Hand Loop Water Pump 2 Runtime Exceeded Total Field Flow Total Field Supply Temp Total Field Return Temp Field Bypass Valve Individual Field Supply Temp typ of 6 Individual Field Return Temp typ of 6 Individual Field Flow typ of 6 Circuit Bypass Isolation Valve typ of 5 Circuit Bypass Pump S S typ of 5 Circuit Bypass Pump Status typ of 5 Mixing Valve from Central Plant x x x x x Total Hardware Total Software Automated Logic Virginia 23 09 93 B 5 1 2 Central Plant 2 Boiler amp 1 Cooling To
52. with factory piped charged and tested packaged water source heat pump direct expansion refrigeration system 1 All refrigeration systems 13 nominal tons and above shall be equipped with two stages of capacity control each on an independent refrigerant circuit 8 2 Refrigeration system shall be provided with thermal expansion valve TXV incorporating adjustable superheat 8 3 Evaporator coil 1 Coil shall be rated in accordance to ARI standards and pressure tested for 250 psi working pressure 2 Coil shall be a minimum of 4 rows deep 3 Refrigeration systems with more than one circuit shall have interlaced evaporator coils 4 Coil casing shall be constructed of 16 gage galvanized steel 5 Coil tubes shall be constructed of 1 2 diameter 0 016 thick seamless copper tubing 6 Coil fins shall be constructed of 0 0060 thick aluminum 8 4 Drain pan 1 Drain pan shall be constructed of a minimum of 18 gage 201 stainless steel 2 Drain pan shall be double sloped to ensure condensate removal from unit 3 Drain pan shall extend a minimum of 8 past the evaporator coil to ensure condensate retention 8 5 Modulating hot gas reheat ENERGY RECOVERY HEAT PUMP UNIT 237200 3 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 1 Hot gas reheat coil shall be separated from the evaporator coil by a minimum of 6 in the direction of airflow to prevent the re e
53. 08 COPPER 26 ty C 1 1 4 NC LA A 218 spl 220 221 223 wer 227 FACULTY LOUNGE 1 EM TOILET U A l i as IL VESTIBULE B Ir 5 4 228 98 B OILET pon zi 91 at ji d o 17 MN c ccc EcL dcc 1 e Da LAI p 1 HDPE 007 _ T ve IMAM 201 Ji a ei URS GRADES MULTIPURPOSE 22 177 PIPE TYP OF 9 267 VESTIBULE 200 zu mim N GRADE 3 007 GRADE 3 5 2 1 2 3 4 Fo Pep LAI an e 2 GLHPS VESTIBULE GYMNASIUM I amp 2 GLHPR CORRIDOR 214 NIC gt 3 4 COPPER 215 f gi ET M Ce CUST OFFICE TA 213 KITCHEN 2 BUILDING STO P 212 ES m EE Se e JL GYMNASIUM N I C EN MECHANICAL HVAC PIPING PLAN v 1 1 16 1 0 2 3 4 6 7 8 9 10 jA AN SHWGROUP ARCHITECTS ENGINEERS PLANNERS 11415 Isaac Newton Square Reston VA 20190 NA YAN SHINE ALLEN amp SHARIFF 7061 Deepage Drive Suite 103A Columbia MD 21045 G ADTEK ENGINEERS INC 10000 Virginia Manor Road Suite 340 Beltsville MD 20705 F E 10 14 2011 ARLINGTON PUBLIC SCHOOLS E TAYLOR ELEMENTARY SCHOOL HVAC RENOVATION 2600 North Stuart Street Arlington Virginia 22207 D DR
54. 23 09 93 Sequence of Operations for HVAC Controls PART 1 GENERAL 1 0 Section Includes 1 1 Loop Monitor and Pumps 1 2 Two Boiler System 1 3 Single Cooling Tower Open Circuit 1 4 Water Source Heat Pump 1 5 Enegy Recovery Unit 1 5 1 6 Enegy Recovery Unit 6 amp 7 1 7 Electric Meter 1 8 Gas Meter 1 9 Water Flow Meter 1 10 Outside Air Conditions 1 11 Point Summary Automated Logic Virginia 23 09 93 B 2 1 1 Ground Source Loop Monitor and Pumps tvpical of 1 Water Source Heat Pump Loop Monitor Run Conditions The loop monitor shall run whenever e Continuously 24 7 to ensure proper field heat transfer The following loop water conditions shall be monitored e Flow status e Supply temperature e Return temperature Alarms and a heat pump shutdown signal shall be generated upon any of the following loop water conditions e NoLoop Flow e High Loop Water Supply Temp Shutdown If the loop water supply temperature is greater than 92 F adj e Low Loop Water Supply Temp Shutdown If the loop water supply temperature is less than 58 F adj Alarms shall be provided as follows e High Loop Water Supply Temp If the loop water supply temperature is greater than 90 F adj e Low Loop Water Supply Temp If the loop water supply temperature is less than 60 F adj Loop Water Pump Lead Lag Operation The two loop water pumps shall operate in a lead lag fashion e The lead pump shall run first e
55. 5 psi e Fail Position Water valves shall fail normally open or closed as follows unless otherwise specified i Water zone valves normally open ii Heating coils in air handlers normally open iii Chilled water control valves normally closed Automated Logic Virginia 23 09 23 9 APS Tavlor Renovation DIRECT DIGITAL CONTROL Section 23 09 23 SYSTEM FOR HVAC Date 11 11 2011 iv Other applications as scheduled or as required by sequences of operation 4 Steam Valves a Close off Differential Pressure Rating Valve actuator and trim shall provide minimum close off pressure rating equal to 150 of operating inlet pressure b Ports Valves providing modulating service shall have linear ports c Sizing i Two position service select pressure drop equal to 10 20 of inlet psig ii Modulating service at 100 kPa 15 psig or less select pressure drop equal to 80 of inlet psig iii Modulating service at 101 350 kPa 16 50 psig select pressure drop equal to 50 of inlet psig iv Modulating service at over 350 kPa 50 psig select pressure drop as scheduled on drawings D Binary Temperature Devices 1 Low Voltage Space Thermostats Low voltage space thermostats shall be 24 V bimetal operated mercury switch type with adjustable or fixed anticipation heater concealed setpoint adjustment 13 C 30 C 55 F 85 F setpoint range 1 C 2 F maximum differential and vented ABS plastic cover 2 Line Volt
56. 5216 2 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 A Boiler manufacturer shall supply as part of boiler package a completely integrated control system to control all operation and energy input of the multiple boiler plant The system shall be comprised of a microprocessor based control utilizing pulse width modulation for bumpless transfer of header temperature and sequential firing The controller shall have the ability to vary each individual module input throughout its full range to maximize the condensing capability of the module and the entire plant without header temperature swings BMS shall provide contact closure for automatic adjustable heat start circuit for plant activation and have contact closure for auxiliary equipment such as pumps and combustion air dampers Boiler shall include integral factory wired operating controls to control all operation and energy input of the boiler The system shall be comprised of a microprocessor based control utilizing pulse width modulation for bumpless transfer of header temperature The controller shall have the ability to vary boiler input throughout its full range to maximize the condensing capability of the boiler and without header temperature swings The plant will operate to vary header temperature setpoint linearly as an externally applied 4 20 ma signal is supplied Maximum efficiency shall be
57. AWN MM CHECKED TS SCALE 1 16 1 0 2011 SHW Group ISSUE October 14 2011 11 11 2011 ADDENDUM 2 6 B KEY PLAN NTS f SHEET TITLE MECHANICAL HVAC PIPING PLAN A M2 1 SHW Project 3111 003 00 10 PIPES DROP DOWN TO EXISTING STEAM TUNNEL FOR CONTINUATION SEE DRAWING M2 3 2 GLHPS amp 2 GLHPR COPPER FOR CONTINUATION SEE DRAWING M2 1 CONNECT NEW GEOTHERMAL CIRCUITS TO SUPPLY AND RETURN MANIFOLDS SEE DRAWING M5 1 CONNECT NEW GEOTHERMAL CIRCUITS TO SUPPLY AND RETURN MANIFOLDS SEE DRAWING M5 1 STAIR 003 5 FROM COOLING TOWER 5 TO COOLING TOWER 6 FLUE TYP OF 2 NOTES 5 amp 6 6 COMBUSTION AIR INTAKE DUCT 6 Y 6 5 NOTE 8 f 01 LH 5 peg NI p ial dels e ELS NOTE U L 2 ou V V I TAT FIELD STO NOTE 9 BASEMENT MECHANICAL ROOM HVAC PIPING PLAN TYP OF 2 STORE 4 HOUSEKEEPING PAD TYP OF 2 002 NOTE 8 7
58. Arlington Public Schools ADDENDUM ADDENDUM 2 DATE November 11 2011 REFERENCE Invitation for Bid No 37FV12 IFB Issue Date October 25 2011 Title Tavlor Elementarv School HVAC Renovation Project Architect Engineer SHW Group LLP Sealed Bid Due Date November 18 2011 before 2 00 PM THE FOLLOWING CHANGES ADDITIONS DELETIONS AND CLARIFICATIONS ARE HEREBV MADE PART OF THE BIDDING REQUIREMENTS AND CONTRACT DOCUMENTS FOR THE ABOVE REFERENCED PROJECT AND SHALL BE TAKEN INTO ACCOUNT IN THE PREPARATION OF ALL BIDS AND THE EXECUTION OF ALL WORK BIDDERS SHALL ACKNOWLEDGE RECEIPT OF THIS ADDENDUM IN THE APPROPRIATE SPACE ON THE BID FORM REQUESTS FOR INFORMATION PB 009 Specification Section 230010 General Conditions mechanical Paragraph 1 01 H refers to specification sections 230900 and 230993 We do not have these spec sections Please advise Answer These spec sections have been issued by Automated Logic Controls and are included in this addendum These sections are provided so the GC can coordinate with the controls contractor to provide a complete system The controls contractor is under a separate contract with the Owner refer to Specification Section 00700 General Conditions Part 7 PB 010 Spec Section 260533 sub section 3 1 calls for exposed conduit in mechanical rooms to be IMC Can EMT be used in lieu of IMC Answer The IMC conduit shall be used in the mechanical room as specified PB 011 Are as built drawings avai
59. Buna N seat Valves smaller than 6 inches for general service shall have 10 position leverlock type handles Valves smaller than 6 inches for throttling service shall have throttling with memory stop type handles Valves 6 inches and larger shall have enclosed gear type operators Provide chain operators where valves are installed 8 feet or more above floor and where indicated on the drawings 3 Valves on un insulated lines shall be Norris No 3310 Demco or Keystone Norris No 3200 in sizes above 12 inches 4 Valves on insulated lines shall be Norris No 3310 Demco or Keyston Norris No 3200 in sizes above 12 inches with extension neck Ball valves shall be Mark Controls Corp or equal Marpac No B780T bronze body hard brass ball TFE seat TFE seals in sizes 1 4 through 2 inches Ball valves 3 inch and 4 inch sizes shall be Mark Control Corp Marpac Series 410 or 470 ANSI Class 150 ductile iron TFE seats TFE seals All ball valves shall be equipped with lever type operating handles Needle Valves Crane 57 bronze needle valve 300 psi with fiber seat Balancing Valves DeZurik Series 100 non lubricated eccentric plug type valves or Illinois Products Series 4000 5000 combination balancing and shutoff valves with an internal mechanism that can be set at the balance o point so that the valve may be closed and opened but not opened beyond the balance position Valve bodies shall be brass or semi steel solder screwed or flanged
60. Du 1 Pp B 1 2 NOTES COMBUSTION AIR INTAKE AND EXHAUST DUCT OUTLETS TVP OF 2 SHALL BE CONNECTED TO SIDEWALL VENT TERMINATION KIT CONTRACTOR SHALL COORDINATE SIDEWALL VENT TERMINATION KIT WITH SITE CONDITION COMPLV WITH CODE AND MANUFACTURER S REQUIREMENTS 6 COMBUSTION AIR INTAKE AND 6 EXHAUST DUCTWORKS SHALL BE LOCATED TIGHT AGAINST CEILING SLAB PROVIDE PVC OR AL29 4C VENT MATERIAL SIDEWALL VENT TERMINATION KIT SHALL BE SUPPLIED BY BOILER MANUFACTURER EXTEND BOILERS B 1 amp B 2 CONDENSATE PIPE TO EXISTING OPEN FLOOR DRAIN GAS CONNECTION 1 1 2 EXISTING GEOTHERMAL SUPPLY AND RETURN HEADERS SHALL REMAIN EXTEND EXISTING SUPPLY AND RETURN MANIFOLDS BY MINIMUM OF 48 PROVIDE 4 HOUSE KEEPING PAD TYPICAL SEE STRUCTURAL DRAWINGS FOR CONSTRUCTION SEE DRAWING M5 1 FOR P 18 P 19 P 20 amp P 21 CONNECTIONS DEMOLITION NOTES REMOVE EXISTING GEOTHERMAL PUMPS AND ASSOCIATED EXISTING PIPING AND HYDRONIC SPECIALITIES AIR SEPARATORS EXPANSION TANKS ETC WITHIN THE MECHANICAL ROOM EXISTING DOMESTIC HOT WATER SYSTEM TO REMAIN 4 M SHWGROUP ARCHITECTS ENGINEERS PLANNERS 11415 Isaac Newton Square Reston VA 20190 NA YAN SHINE ALLEN amp SHARIFF 7061 Deepage Drive Suite 103A Columbia MD 21045 ADTEK ENGINEERS INC 10000 Virginia Manor Road Suite 340 Beltsville MD 20705 10 14 2011
61. ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 Payment made on account of the contract shall in no way relieve the Contractor from this responsibility B Contractor shall cap all pipes ducts etc not completed until ready for final inspection after which they shall be thoroughly cleaned and left unobstructed in any way Cap with like material i e galvanized steel copper etc C If during the progress of the work any portion thereof shall be liable to damage from inclement weather or other work such effective protection as may be deemed necessary by the Owner must be provided by this Contractor D All work which does not comply with the requirements of the Contract or all work damaged by reason of neglect on the part of the Contractor or lack of protection prior to acceptance shall be removed E Contractor shall be responsible for damage caused by leaks in any of the equipment or material installed by him through equipment or material failures or disconnected pipes or fittings and shall make at his own expense all repairs or replacements required as a result of such damage 1 07 TEMPORARY SERVICE A Unless specifically called for and outlined under the individual section of the specifications all temporary services required for building construction including water heat air conditioning ventilation electricity sanitary facilities etc will be furnished by the General Contractor The
62. Furnished Under This Section A Section 28 31 00 Fire Detection and Alarm 1 Smoke Detectors Fire Stats 1 3 Products Not Furnished or Installed but integrated with the Work of this Section e None 1 4 Related Sections A The General Conditions of the Contract Supplementary Conditions and General Requirements are part of this specification and shall be used in conjunction with this section as part of the contract documents 1 5 Description A General The control system shall consist of a high speed peer to peer network of DDC controllers and a web based operator interface Depict each mechanical system and building floor plan by a point and click graphic A web server with a network interface card shall gather data from this system and generate web pages accessible through a conventional web browser on each PC connected to the network Operators shall be able to perform all normal operator functions through the web browser interface B The system shall directly control HVAC equipment as specified in Section 23 09 93 Sequence of Operations for HVAC Controls Each zone controller shall provide occupied and unoccupied modes of operation by individual zone Furnish energy conservation features such as optimal start and stop night setback request based logic and demand level adjustment of setpoints as specified in the sequence Automated Logic Virginia 23 09 23 2 APS Tavlor Renovation DIRECT DIGITAL CONTROL Section 23 09 23 SY
63. G Crane 34 Jenkins 92 A Nibco T 413 Stockham B 319 Swing check valves flanged ends 2 inches and larger iron body bronze mounted 125 psi SWP 200 psi WOG Crane 373 Jenkins 624 Nibco F 918 Stockham G 931 Swing check valves solder ends 2 inches and smaller bronze 125 psi SWP 200 psi WOG Crane 1303 Jenkins 1222 Nibco S 413 Stockham B 309 230523 1 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 J VALVES Non slamming check valves Smolensky noiseless Williams Hager Mueller or Mission Duo Chek quick closing slow opening quiet acting non slamming check valves shall be furnished in discharge lines from pumps and where indicated on the drawings or details Lubricated plug valves 1 inch through 2 inches Nordstrom No 142 or Homestead No 611 screwed ends 2 1 2 inches and larger Nordstrom No 143 or Homestead No 612 flanged ends WP 175 psi WOG with wrench and lubricant for specific service of the valve Plug valves smaller than 1 inch shall be Crane 1228 iron body bronze trim 125 psi WOG Butterfly Valves 1 All butterfly valves shall be lug type with lugs drilled and tapped to receive cap screws Valves on insulated lines shall have extension necks and operators shall clear insulation 2 Butterfly valves shall have ductile iron body aluminum bronze disk 416 stainless steel stem Buna N O Ring stem seal and
64. HEAT PUMP UNIT 237200 1 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 1 2 cC Access doors shall be provided for access to all components requiring regular maintenance or inspection Access doors shall have a minimum of two quarter turn compression latches with adjustable catches Access door construction shall be identical to unit casing Interior side of access doors shall be 22 gage G 90 galvanized steel Exterior side of panel shall be 22 gage painted steel rated for 1000 hours in accordance with ASTM B117 and ASTM D1654 Access doors shall be sealed with a full perimeter gasket constructed of Mylar encased low density foam Insulation 7 1 Insulation of shall be 2 Ib ft foam insulation with an average R value of 6 per inch 7 2 Insulation water absorption must be more that 0 038 Ib ft per ASTM D 2842 and show no growth per ASTM G21 biocide testing 7 3 Noinsulation shall be exposed to the air stream 7 4 Fiberglass insulation is not acceptable due to possibility of sloughing and moisture retention 3 6 Weatherhood with bird screen shall be provided on outside air inlet 3 7 Roof shall be pitched with a minimum 1 2 roof overhang around the perimeter of the unit 4 BLOWERS MOTORS 4 1 Blowers 1 5 6 7 Fan assemblies shall be mounted on rubber in shear isolators Fan assembli
65. HECK KEEPING PAD 3 4 CONDENSATE DRAN KEEPING PAD VALVE TYP OF 2 EXTEND TO OPEN DRAN IN GAS PRESSURE FOR CONTINUATION REFER MECHANICAL ROOM TYP OF 2 REGULATOR TYP OF 2 TO POINT i IN THE THREE WAY CONTROL GEOTHERMAL VATES MIY T 1 MODULATING VALVE T 2 TT 6 GLHPS e PRESSURE DROP THROUGH 6 CONNECTING BRIDGE SHALL NOT EXCEED 1 4 FOOT NO SCALE RELIEF VALVE ES RUE AIR A VEI CHECH VALV l PRESSURE HIGH Veil OF 2 VOUS CONNECT TO SIDE OF MAIN AVOID E EVE a wane TOP OR BOTTOM CONNECTION TO MAKEUP WATER ROLE P 1 BALANCING ISOLATION PREVENT AIR OR DEBRIS FROM Dc VALVE TYP OF 2 ENTERING FROM PIPE TO TANK BACKFLOW 2 NO P R E N TE R O XXXIX IXXXXXXXI L HHH T 2 B8G MODEL VFD 1 MONITORING 1 ROLAIRTROL R 6F 6 6 2 AUTOMATIC AIR 6 BUILDING LOADS HPS VENT 95 F MAX COOLING HIGH CAPACITY O 60 F MIN HEATING BGMIEL 87 T AIR SEPARATOR WITH P 2 Q i AU SHUTOFF v Se B ST BY 6 4 VALVE NO O WK HRH 3 P HR VFD 2 SEE CORRESPONDING PRE CHARGING AIR NOTE POINTS 1 AND 2 IN WLHP FLOW DIAGRAM PUMPS P 1 OR P 2 SHALL RUN CONTINUOUSLY 1 ET 1 B amp G MODEL B 200 G 7 LI a T WWW CHEMICAL FEEDER T 1 6 G NA 6 650 GPM MAXIMUM FLOW hat BUTTERFLY la SEA VALVE X RUE TT I TWO WAY MODULATI FLOW METER 450 N CONTROL VALVE GPM e 92 INSTALL TWO SENSOR TO GEOTHERMAL FIELD
66. K Manufacturers Flo Lab or approved equal PART 3 EXECUTION 3 01 INSTALLATION A Install thermometers in accordance with manufacturer s instructions Coordinate with other work Calibrate units to insure accurate readings THERMOMETERS 230519 1 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 B Install Thermometers on the supply and return geothermal circuits connected to the geothermal manifold in the mechanical Room Boiler Room C Install Thermometers on the condenser water piping and hot water piping as shown on the flow diagram D Coordinate with the control specifications sections 230900 and 230993 END OF SECTION THERMOMETERS 230519 2 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 SECTION 230520 PRESSURE GAUGES PART 1 GENERAL 1 01 DESCRIPTION A Provide gauges where indicated on the drawings and details in accordance with specifications B Submit manufacturer s data including scale range ratings and performance curve PART 2 PRODUCTS 2 01 PRESSURE VACUUM AND COMBINATION GAUGES A Dial Size 4 1 2 B Case One piece phenolic turret type with safety blowout disc C Accuracy 2 of 1 of full scale range D Bourdon Tube Phosphor bronze brass socket 3 connection with forged brass socket and tip and silve
67. L THE FRONT RIGHT AND BACK SIDES OF UNIT AND 3 CLEARANCE ON LEFT SIDE OF UNIT IF SUPPLY OR RETURN IS NOT LOCATED ON LONG SIDE OF UNIT CLEARANCE PROVIDE 27 CLEARANCE ON THIS SIE OF UNIT SCHEDULES A M3 1 SHW Project 3111 003 00 COOLING TOWER CT 1 HEAT TRACE amp INSULATE ALL CONDENSER WATER SUPPLY AND RETURN DRAIN PIPE TO INCLUDE VALVE AND ALL OTHER PIPING SUBJECT TO FREEZING ALL PIPNG EXPOSED TO OUTDOOR SHALL BE PROVIDED WITH ALUMINUM JACKET WITH SEALED JOINTS FULL SIZE OF CONNECTION OVERFLOW DRAIN CONTROL WIRING FROM LIQUID LEVEL CONTROLLER TOWER CDS CONTROL VALVE FURNISHED BY COOLING TOWER SCHEDULE 40 MANUFACTURER 5 m 1 1 2 MAKE UP WATER FLOW BA 5 5 SWITCH TO LOCK OUT BOILER WHEN a ee CONDENSER WATER PUMP IS RUNNING COMBINATION BALANCING amp T 4 NO f ISOLATION VALVE TYPICAL TT O 3 KXXXXXX 7 Ho C od 5 P 7 ANC CONDENSER PUMP ON C NO tO EXCHANGER U p O 3 KRXXXXX J C ixxxxzzxzi LI P 8 5 Le STANDBY FOR P 7 5 WLHPS L eI 6 NO a 6 p jA 5 O 3 BOXXXXXj 1 7 PH C SKK KIS n ONC P 9 ON C 2 O E CHECK WLHP p O P TYPICAL j 004 7 PHI C ixxxxxxxi 3 ui P 17 z D z 5 x z 3 SHUTOFF vayg STAND BY FOR P 9 4 2 MP 2 P 3 3 P 5 3 he GAS SUPPLY FIA E E GAS RATED C
68. NDERGARTEN H AP N KINDERGARTEN BREK 104 E L n 103 116 l 4 1 2 L 1 T 115 L 4 e L J 11 4 1 4 mE Ta 4 e POD 4 POD 5 5 b 159 160 dD Bw CLASSROOM CLO d en N TOILET U 118 CORRIDOR bis 9 EC 4 149 iind e N POD 9 POD 10 p 2900 ya STO 1 M 1 1 4 T AN STO ie ien DA z E r bibe DIN 1 oo C 1 1 164 MA ud ERD 1 1 4 TOILET CORRIDOR pn ds l WORKISTO 188 008 420A U J 119A ml LL CORRIDOR 3 4 77 COMPUTERLAB COMPUTER LAB 184 1 1 4 rA GUIDANCE onrereno E 167 168 i 89 00 Ae A ta ils JA E 5 2 134 Berl QD Ey 163 i AV em UN L Ton LN N 1 1 4 N LAJ IL 7 1 4 1 1 4 Ji HC TOILET 4 i N27 cLo KA a U SPEECH B 0 x GRADE 4 GRADE 5 L 10 E Br a i E i 49 7 es b e Lad i LDR 120 119 L CORRIDOR CORRIDOR m 156 2 162 7 l I ea 2 de 190 B 002 002A a 150 B 1 p NA Pe i i IE 1 1 4 j 1 a lu B 2 CLINIC BS 2 LAJ ag des SPECIAL ED LA imd l l 135 T UN amp N N Dwal 114B H 5 sane em L s B J PRINCIPAL e5 5 17 TIC H b N 180 gt N 140 3 4 m VE By 155 f C wu Yl L
69. NERAL CONDITIONS MECHANICAL 230010 7 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAVLOR ELEMENTARV SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 13 Name Address and Telephone Number of local or nearest Manufacturer s Representative 14 Name Address and Telephone Number of firm or persons to perform service work during guarantee and warranty period 3 09 OPERATING INSTRUCTIONS A Prior to final inspection or acceptance fully instruct Owner s designated operating and maintenance personnel in the operation adjustment and maintenance of all products equipment and systems Instruction time shall be sufficient to fully instruct all shifts of the Owner s operating and maintenance personnel Operations and maintenance manual shall constitute the basis of instruction Review contents of manual with personnel in full detail to explain all aspects of operations and maintenance 3 10 COMPLETION REQUIREMENTS A B Before acceptance and final payment the Contractor shall provide the following The mechanical contractor shall maintain at the site for the owner one 1 copy of all drawings showing in red ink all changes from the original plans made during installation of the work specifications addenda approved shop drawings change orders and other modification This set shall remain in the office at all times and shall not be used for the construction references These As Built drawings shall
70. ON REFER TO POINT 2 IN THE GEOTHERMAL WATER FLOW DIAGRAM HPR 6 GLHPR K EXISTING TR 7 P 18 FREEZE PROTECTION INSTALL IN MECHANICAL ROOM 001 INSTALL TWO SENSOR WELLS NEW CIRCUIT SETTER BALANCING VALVE 54 GPM THREE WAY CONTROL VALVE SHALL BE OPEN DURING BUILDING POWER OUTAGE TO ALLOW WATER FLOW THROUGH P 18 P amp T PLUG P amp T PLUG A A A So PPE SOCKET FUSION 1 TO 1 PRE ee SENSOR BRASS MALE PIPE FITTING W P amp T PLUG TYPICAL OF 26 CONNECT EXISTING HDPE GEOTHERMAL PIPE TO NEW 3 COPPER MANIFOLD RETURN TYPICAL OF 13 CONNECT EXISTING HDPE GEOTHERMAL PIPE TO NEW 3 COPPER MANIFOLD SUPPLY VA TYPICAL OF 13 YN NEW CIRCUIT 1 NO SCALE P 19 FREEZE PROTECTION INSTALL IN MECHANICAL ROOM 001 INSTALL TWO SENSOR WELLS NEW CIRCUIT SETTER BALANCING VALVE 17 GPM THREE WAY CONTROL VALVE SHALL BE OPEN DURING BUILDING POWER OUTAGE TO ALLOW WATER FLOW THROUGH P 19 P amp T PLUG P amp T PLUG A va FLOW METER THREAD O LET 2 COPPER SOCKET FUSION 1 TO 1 E ME BRASS MALE PIPE FITTING W CONNECT EXISTING HDPE P amp T PLUG TYPICAL OF 8 GEOTHERMAL PIPE TO NEW 2 COPPER MANIFOLD SUPPLY YN TYPICAL OF 4 A CONNECT EXISTING HDPE GEOTHERMAL PIPE TO NEW 2 COPPER MANIFOLD RETURN TYPICAL OF 4 NEW CIRCUIT 2 NO SCALE P
71. On failure of the lead pump the lag pump shall run and the lead pump shall turn off e On decreasing loop water differential pressure the lag pump shall stage on and run in unison with the lead pump to maintain loop water differential pressure setpoint The designated lead pump shall rotate upon one of the following conditions user selectable manually through a software switch if pump runtime adj is exceeded daily weekly monthly Alarms shall be provided as follows e Loop Water Pump 1 Automated Logic Virginia 23 09 93 B 3 Failure Commanded on but the status is off Running in Hand Commanded off but the status is on Runtime Exceeded Status runtime exceeds a user definable limit VFD Fault e Loop Water Pump 2 e Failure Commanded on but the status is off e Running in Hand Commanded off but the status is on e Runtime Exceeded Status runtime exceeds a user definable limit e VFD Fault Loop Water Differential Pressure Control The controller shall measure loop water differential pressure and modulate the loop water pump VFDs in sequence to maintain its loop water differential pressure setpoint at each of three locations in the building Rooms 118 254 amp 277 The following setpoints are recommended values All setpoints shall be field adjusted during the commissioning period to meet the requirements of actual field conditions The controller shall modulate loop water pump speeds to maintain a loop wat
72. PIPE TO NEW 2 COPPER MANIFOLD SUPPLY TYPICAL OF 7 NEW CIRCUIT 4 NO SCALE INSTALL TWO SENSOR WELLS NEW CIRCUIT SETTER BALANCING VALVE 37 GPM P amp T PLUG P amp T PLUG A l FLOW METER y THREAD O LET pc TR PPE ISOLATION VALVES TYPICAL ON SOCKET FUSION 1 TO 1 a SENSOR EACH GROUND LOOP SUPPLY AND BRASS MALE m FITTING W RETURN PIPING P amp T PLUG TYPICAL OF 18 CONNECT EXISTING HDPE CONNECT EXISTING HDPE GEOTHERMAL PIPE TO NEW 2 GEOTHERMAL PIPE TO NEW 2 COPPER MANIFOLD RETURN COPPER MANIFOLD SUPPLY TYPICAL OF 9 TYPICAL OF 7 NO SCALE 6 7 8 9 10 D ee SHWGROUP ARCHITECTS ENGINEERS PLANNERS 11415 Isaac Newton Square Reston VA 20190 J NA YAN SHINE ALLEN amp SHARIFF 7061 Deepage Drive Suite 103A Columbia MD 21045 G ADTEK ENGINEERS INC 10000 Virginia Manor Road Suite 340 Beltsville MD 20705 F HER 4 ji M l Lj 10 44 201 ARLINGTON PUBLIC SCHOOLS E TAYLOR ELEMENTARY SCHOOL HVAC RENOVATION 2600 North Stuart Street Arlington Virginia 22207 D DRAWN MM CHECKED TS SCALE NO SCALE 2011 SHW Group ISSUE October 14 2011 11 11 2011 ADDENDUM 42 C B SHEET TITLE MECHANICAL WATER FLOW DIAGRAMS A M5 1 SHW Project 3111 003 00 ATTACHMENT B FULL SPECIFICATION SECTIONS 00420 BID FORM 230923 DIRECT DIGITAL CONTROL SYSTEM FOR HVAC 230993 SEQUENCE OF OPERATIONS FOR HVAC CONTROLS
73. RCHITECTS ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 SECTION 230519 THERMOMETERS PART 1 GENERAL 1 01 DESCRIPTION A Provide adjustable angle connection type thermometers as shown on the drawings details and as specified B Submit manufacturer s catalog data including scale range ratings and performance curve PART 2 PRODUCTS 2 01 THERMOMETERS A Basis of design Flo Lab Series L9VU B Case V shape design high pressure die cast aluminum baked blue epoxy enamel finish Heavy glass protected front firmly secured against rattles by spring action C Stem Steel tapered bulb chambers copper plated D Locking Device Two adjusting screws provide full 3600 adjustment of thermometer case and stem E Adjustable Joint Die cast aluminum finished to match case Completely encloses capillary to prevent tempering and foreign particles from entering instruments F Tube amp Capillary Alcohol filled magnifying lens Green Reading tube G Accuracy within 1 of full scale range Silicone shock mounted for lasting durability Range 30 F to 180 F H Scale Satin faced non reflective aluminum with bold jet black markings permanently etched Locked in place and adjustable through device at top scale No mounting screws to obliterate scale markings l Socket Provide brass socket J Federal Spec Units shall comply with Federal Specification GG T 32ID
74. RS 6 1 Outdoor air intake hood 1 2 3 Filter rack shall accommodate 2 media Manufacturer shall provide 1 set of 2 aluminum filter media Filter sections shall be accessible outside the unit and located in the outdoor air intake hood 6 2 Outdoor air filters 1 Outdoor air filter rack shall accommodate factory provided 2 aluminum filters ENERGY RECOVERY HEAT PUMP UNIT 237200 2 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 6 3 6 4 2 Filter sections shall be accessible through a 2 foam injected double wall hinged access door with quarter turn latches Supply air filters 1 Supply air filter rack shall accommodate 2 MERV 8 filters 2 Filter sections shall be accessible through a 2 thick foam injected double wall hinged access door with quarter turn latches Return air filters 1 Return air filter rack shall accommodate factory provided 2 pleated filters 2 Filter sections shall be accessible through a 2 thick foam injected double wall hinged access door with quarter turn latches 7 ENERGY RECOVERY ENTHALPY WHEEL 7 1 7 2 7 3 7 4 7 5 7 6 7 7 7 8 7 9 7 10 Energy recovery shall be an integral part of unit from the manufacturer No field assembiv ducting or electrical wiring shall be required with energv recoverv Energy recovery shall be provided through a total enth
75. STEM FOR HVAC Date 11 11 2011 C Control for ERUs shall be via third Party BACnet interface Interface points monitoring and control shall be as shown on the control schematic diagrams and or the point list Control devices within the unit envelop shall be factory mounted and test Devices outside the unit envelope shall be field mounted checked and commissioned 1 6 Approved Control Systems A The following are approved control system suppliers manufacturers and product lines WebCTRL Automated Logic Virginia Automated Logic Corporation B Contact Information Jeff Smidler 804 864 2090 jsmidler aero is com 1 9 System Performance A Performance Standards System shall conform to the established APS standards for WebCTRL systems The following tables outline the required accuracy of devices Automated Logic Virginia 23 09 23 3 APS Tavlor Renovation Table 1 Reporting Accuracv Measured Variable Space Temperature Dew Point Water Temperature Delta T Relative Humiditv Water Flow DIRECT DIGITAL CONTROL SYSTEM FOR HVAC Reported Accuracy 0 5 41 F 0 5 C 1 F 1 0 C 2 F 1 5 C 3 F 0 5 C 1 F 0 15 C 0 25 F 5 RH 2 of full scale Section 23 09 23 Date 11 11 2011 Airflow terminal Airflow measuring stations Airflow pressurized spaces Air Pressure ducts Air Pressure space Water Pressure Electrical A V W Power Factor Carbon Mon
76. T TYPE GEOTHERMAL SYSTEM 238146 5 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 signed signed date date Engineer Engineer print print signed signed date date Owner s Representative Owner s Representative print print signed signed date date END OF SECTION HEAT PUMP SYSTEM CLOSED CIRCUIT TYPE GEOTHERMAL SYSTEM 238146 6 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS ATTACHMENT C FULL SPECIFICATION SECTIONS UNDER SEPARATE CONTRACT 230923 DIRECT DIGITAL CONTROL SYSTEM FOR HVAC 230993 SEQUENCE OF OPERATIONS FOR HVAC CONTROLS APS Tavlor Renovation Automated Logic Virginia DIRECT DIGITAL CONTROL Section 23 09 23 SYSTEM FOR HVAC Date 11 11 2011 Section 23 09 00 Instrumentation and Control for HVAC Arlington Public Schools Taylor Elementary School HVAC Renovation 23 09 23 1 APS Tavlor Renovation DIRECT DIGITAL CONTROL Section 23 09 23 SYSTEM FOR HVAC Date 11 11 2011 23 09 23 Direct Digital Control System for HVAC PART 1 GENERAL 1 1 Products Furnished But Not Installed Under This Section A Section 23 09 13 23 Sensors and Transmitters 1 Press and temp sensor wells amp sockets 2 Temp sensor wells and sockets B Section 23 09 13 33 Control Valves 1 Control valves 1 2 Products Installed But Not
77. TS ENGINEERS PLANNERS TAVLOR ELEMENTARV SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 3 06 CLEARANCES A Check layout of systems with the Architectural drawings and verify all dimensions and conditions at the project site No extra compensation will be allowed because of differences between actual dimensions and spaces and sizes indicated on the drawings All work shall be neatly installed so as to be readily accessible for operation maintenance and repair without the reduction of necessary headroom and passage clearance Dimensions or equipment shall permit the entrance into space allotted to it and shall permit ready access to it and adjoining equipment for maintenance and repair Equipment which does not fit into its allowed spaces with sufficient clearance for proper maintenance will be rejected as unsuitable Contractor shall check equipment for major differences in size which shall be indicated on the submission to avoid inaccessible locations 3 07 RUBBISH A All rubbish and other debris due to or connected with work performed under this division of the Contract shall not be allowed to accumulate and shall be hauled from the premises to provide a clean work site All trades shall at the end of each work day leave the area broom clean and all materials stored in an orderly fashion 3 08 MANUALS A Contractors shall furnish three 3 manuals in loose leaf binders B The names of the Project
78. YLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 Bidder acknowledges that Owner and Owner s Representative Architect do not assume responsibility for the accuracy of dimensions or completeness of information and data shown or indicated in the Bid Documents with respect to existing facilities Bidder has given Owners Representative Architect written notice of all conflicts errors ambiguities or discrepancies that Bidder has discovered in the Bid and Contract Documents and the Written resolution thereof by Owner s Representative Architect is acceptable to Bidder and the Contract Documents are generally sufficient to indicate and convey understanding of all terms and conditions for performing and furnishing the Work for which this Bid is submitted By bidding in response to this invitation the Bidder represents that in the preparation and submission of this Bid said Bidder did not either directly or indirectly enter into any combination or arrangement with any person firm or corporation or enter into any agreement participate in any collusion or otherwise take any action in the restraint of free competitive bidding in violation of the Sherman Act 15 U S C Section 1 or Sections 59 1 9 1 through 59 1 9 17 or Sections 59 1 68 6 through 59 1 68 8 of the Code of Virginia Bidder hereby certifies that if awarded the Contract for construction of the Project it will take all possible actions
79. achieved at minimum firing input Main header outlet temperature shall not be more than 0 2F from setpoint at any point of operation 2 3 WARRANTEE A B The pressure vessel of boiler shall carry an unconditional 10 year warranty against leakage due to defective materials or workmanship The heat exchanger tubes combustion chamber assembly shall be warranted against failure due to thermal stress failure or corrosion for a five year period A Warranty Certificate must be issued to the owner from the manufacturer and a copy of the warranty be submitted for Engineers approval The boiler system and the control system shall be guaranteed for two years PART 3 EXECUTION 3 1 INSTALLATION A All aspects of installation of Boiler Plant shall be in strict accordance with manufacturer s instructions Materials shall conform with all manufacturer s recommendations and shall include a Stainless Steel AL 29 4C Positive Pressure UL listed Vent System or PVC as required by the boiler manufacturer Boiler plant piping shall be field constructed of materials as specified Each boiler shall have individually isolating shutoff valves for service and maintenance Install boilers where shown in accordance with equipment manufacturer s written instructions and with recognized industry practices to ensure that boilers comply with requirements and serve intended purposes Comply with requirements of state and local boiler codes and applicable provi
80. acturer s catalog data performance specifications and dimension data for each type and size of valve 1 03 EXTENSION FOR INSULATION A Provide factory installed extensions on all valves so insulation can be properly installed PART 2 PRODUCTS 2 0 VALVES GENERAL A VALVES Gate valves screwed ends 2 inches and smaller bronze rising stem solid wedge disc 125 psi SWP 200 psi WOG Crane 428 Jenkins 47 Nibco T 111 Stockham B 107 Gate valves flanged ends 2 1 2 inches and larger iron body bronze mounted non rising stem solid wedge disc 125 psi SWP 200 psi WOG Crane 461 Jenkins 326 Nibco F 619 Stockham G 612 Gate valves solder ends 2 inches and smaller bronze rising stem solid wedge disc 125 psi SWP 200 psi WOG Crane 1334 Jenkins 1242 Nibco S 111 Stockham B 109 Globe valves screwed ends 2 inches and smaller bronze 150 psi SWP 300 psi WOG Crane 7 Jenkins 106 A Nibco T 235 Stockham B 22 Furnish disc suitable for service intended Globe valves flanged ends 2 1 2 inches and larger iron body bronze trim 125 psi SWP 200 psi WOG Crane 351 Jenkins 613 Nibco F 718 Stockham G 512 Furnish disc suitable for service intended Globe valves solder ends 3 inches and smaller bronze 125 psi SWP 200 psi WOG Crane 1310 Jenkins 1200 Nibco S 211 Stockham B 14 Furnish disc suitable for service intended Swing check valves screwed ends 2 inches and smaller bronze 125 psi SWP 200 psi WO
81. age Space Thermostats Line voltage space thermostats shall be bimetal actuated open contact type or bellows actuated enclosed snap switch type or equivalent solid state type with heat anticipator UL listing for electrical rating concealed setpoint adjustment 13 C 30 C 55 F 85 F setpoint range 1 C 2 F maximum differential and vented ABS plastic cover 3 Low Limit Thermostats Low limit airstream thermostats shall be UL listed vapor pressure type Element shall be at least 6 m 20 ft long Element shall sense temperature in each 30 cm 1 ft section and shall respond to lowest sensed temperature Low limit thermostat shall be manual reset only E Temperature Sensors 1 Type Temperature sensors shall be Resistance Temperature Device RTD or thermistor 2 Duct Sensors Duct sensors shall be single point or averaging as shown Averaging sensors shall be a minimum of 1 5 m 5 ft in length per 1 m 10 ft of duct cross section 3 Immersion Sensors Provide immersion sensors with a separable stainless steel well Well pressure rating shall be consistent with system pressure it will be immersed in Well shall withstand pipe design flow velocities 4 Space Sensors Space sensors shall have setpoint adjustment override switch display and communication port as shown 5 Differential Sensors Provide matched sensors for differential temperature measurement F Humidity Sensors 1 Duct and room sensors shall have a sensing
82. all duct work lighting fixtures piping electrical conduits mechanical equipment HVAC equipment plumbing equipment and fixtures and electrical equipment The mechanical contractor will coordinate these drawings with all other trades E Submit complete plan and section views with the above coordinated drawings F Forward shop drawings in single copv sepia or other equivalent transparencv and one blue line print Notations as to acceptance or correction will be noted on transparencv Upon return of transparency the Contractor shall correct the original tracing and submit a new transparency for review Upon final acceptance of the transparency prepare prints for the use of the various trades as may be required GENERAL CONDITIONS MECHANICAL 230010 4 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 G Submit complete wiring diagrams for all equipment furnishes under Division 23 for the use of the electrical trades showing all equipment and control device terminals and the relationship to the electrical service H Furnish samples of materials when requested by the Owner prior to acceptance of submittals l Submittal stamping The intent of the submittals is to help the Contractor avoid mistakes in the purchase of equipment to advise him of the related equipment that might be affected by substitution and to help avoid purchases of equipment tha
83. all be provided to allow for a field supplied dry contact to start and stop the cooling tower cooling function The contact will not disable the tower basin heater circuit if supplied The building automatic temperature control ALC system shall provide the dry contact for the cooling function as well as the analog 0 10 VDC or 4 20 mA reference signal to control the condenser water temperature by varying the motor fan speed through the VFD In addition the following points shall be provided for monitoring by the ALC system Inverter Selected Bypass Selected Inverter Fault Alarm Inverter Run Basin Heater On Tower High Water Alarm Tower Low Water Alarm Analog Output for Motor Amps 4 20mA Fan motor s basin heaters temperature sensors and any remote control devices supplied for the cooling tower must be field wired to the control panel Basin Water Level Control The cooling tower manufacturer shall provide an electric water COOLING TOWER 236500 3 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 level control EWLC system The system shall consist of water level sensing and control units in quantities and locations as indicated on the drawings Each water level sensing and control unit shall consist of the following NEMA 4 enclosure with gasketed access cover solid state controls including all necessary relays and contacts to achieve the speci
84. alog Value Analog Value Analog Value Analog Value Analog Value Analog Value Analog Value Analog Value Analog Value Analog Value Analog Value Analog Value Analog Value Analog Value Analog Value Analog Value Analog Value Analog Value Binary Value Binary Value Binary Value Binary Value Binary Value Binary Value Binary Value Binary Value Analog Value Analog Value Analog Value Analog Value Analog Value Analog Value Analog Value Analog Value Analog Value Analog Value Analog Value Analog Value Analog Value Analog Value Analog Value Binary Value Binary Value Analog Value Automated Logic Virginia Exhaust Fan VFD Offset Occupied Space Setpoint Space Humidity Setpoint UnOccupied Dewpoint Setpoint UnOccupied Humidity Setpoint Space Temperature Input Space RH Input Heat Wheel Frost Protect Setpoint CO2 From Network CO2 High Limit Setpoint Network Static Pressure Space Enthalpy Outside Air Dewpoint Outside Air Enthalpy Duct Static Pressure Exhaust Air Temp Digital Scroll Output Heat Pump Water Valve A Heat Pump Water Valve B Effective Setpoint Fan Status High Low Press Coutout Ct A High Low Pressure Cutout Ct B Occupancy State Modulating Gas Heat Enable Gas Heat Enable Stage Two Supply Fan Alarm Economizer Enable High CO2 Max Damper Pos Unoccupied Heating Setpoint IAQ Damper Setpoint Air Flow Measuring Station IAQ Damper position Alarm Code Output Heat Wheel VFD Speed Outside Air Te
85. alpy wheel providing sensible and latent energy transfer Construction 1 Energy recovery wheel shall be constructed of lightweight polymer substrate with permanently bonded silica gel desiccant 2 Individual pie shaped wheel sections shall be removable from wheel cassette for maintenance 3 Wheel bearings shall be selected to provide an L 10 life in excess of 400 000 hours 4 Rim shall be continuous rolled stainless steel and the wheel shall be connected to the shaft by means of taper locks 5 Energy wheel cassette shall include seals drive motor and drive belt Latent energy shall be transferred entirely in the vapor phase The energy recovery cassette shall be an Underwriters Laboratories Recognized Component for electrical and fire safety The wheel drive motor shall be an Underwriters Laboratory Recognized Component and shall be mounted in the cassette frame and factory wired to main ventilator disconnect Thermal performance shall be certified by the wheel manufacturer in accordance with ASHRAE Standard 84 Method of Testing Air to Air Heat Exchangers and ARI Standard 1060 Rating Air to Air Energy Recovery Ventilation Equipment Energy recovery wheel cassette shall be mounted perpendicular to the base of the unit Energy recovery wheel cassette shall be accessible through a 2 thick foam injected double wall hinged access door with quarter turn latches 8 COOLING WATER SOURCE HEAT PUMP 8 1 Unit shall be provided
86. and to ensure that actuators fail in the proper direction c Test interlock actions by simulating alarm conditions to check initiating value of variable and interlock action 3 17 Control System Demonstration and Acceptance A Demonstration Prior to acceptance perform the following performance tests to demonstrate system operation and compliance with specification after and in addition to tests specified in Article 3 17 Control System Checkout and Testing Provide Engineer with log documenting completion of startup tests 1 2 Engineer will be present to observe and review svstem demonstration Notifv Engineer at least 10 davs before svstem demonstration begins Demonstration shall follow process submitted and approved under Section 23 09 23 Article 1 10 Submittals Complete approved checklists and forms for each system as part of system demonstration Demonstrate actual field operation of each sequence of operation as specified in Section 23 09 93 Demonstrate calibration and response of any input and output points requested by Engineer Provide and operate test equipment required to prove proper system operation Demonstrate compliance with Section 23 09 23 Part 1 System Performance Demonstrate compliance with sequences of operation through each operational mode Automated Logic Virginia 23 09 23 16 APS Tavlor Renovation DIRECT DIGITAL CONTROL Section 23 09 23 SYSTEM FOR HVAC Date 11 11 2011 6 Tests that fail to de
87. at exchanger condensate drain The BOILER shall feature the Smart Touch control with a Liquid Crystal touch screen display password security outdoor air reset pump delay with freeze protection pump exercise domestic hot water prioritization and PC port connection The BOILER Shall have contacts for any failures runtime contacts and data logging of runtime ignition attempts and failures The BOILER shall allow 0 10 VDC input connection for BMS control and have built in Cascade to sequence and rotate while maintaining modulation of up to eight boilers without utilization of an external controller The control may be compatible with optional Modbus communication The BOILER shall be equipped with two terminal strips for electrical connection A low voltage connection board with 30 data points for safety and operating controls i e Alarm Contacts Runtime Contacts Louver Proving Switch two Flow Switches Tank Thermostat Remote Enable Disable Wall Thermostat Zone Control System Supply Sensor Outdoor Sensor Tank Sensor Modbus Building Management System signal and Cascade control circuit A high voltage terminal strip shall be provided for Supply voltage Supply voltage shall be 120 volt 60 hertz single phase The high voltage terminal strip plus integral relays are provided for independent pump control of the System pump the Boiler pump and the Domestic Hot Water pump The System pump and boiler pump dry contacts shall be siz
88. at pump units There are total of 90 ninety existing boreholes 400 feet deep each and 2 two boreholes 200 feet deep each The 1 HDPE thermally fused at the bottom pipes were installed in each borehole and were grouted with the standard grout K 0 34btu hr ft F The 56 fifty six boreholes are located on the East side of the building and connected to the 15 fifteen supply and 15 fifteen return circuits The 2 each supply and return circuits are connected to the main supply and return manifolds in the mechanical room There are total of thirty six 36 individual boreholes located on the South West and North sides of the building perimeter These boreholes are connected to the individual console heat pump units located in the classroom wings The 56 boreholes field was pressure tested see the attached report Since no leak was detected all the existing boreholes were planned to be reused as a part of the new HYBRID system However due to the earthquake event which took place after the pressure test was conducted the additional pressure test of the 56 boreholes field should be performed to ensure that no damage was done to the geothermal piping The pressure test report should be issued and provided to the Owner Architect and Engineer GEOTHERMAL SYSTEM 232113 33 2 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 The permanently
89. ations mean binders filled with all required information Copies of submittal alone will not be accepted nor will generic manufacturer s maintenance manuals Generic maintenance manuals must be altered to show specific data concerning models of equipment installed at this project along with equipment designation shown on the contract drawings H Cleanup Requirements 1 Refer to Architectural specification 2 Clean equipment and restore to new condition 3 Touch up paint finish damage 4 When paint damage is extensive as determined bv the Engineer repaint completelv with paint equal to original finish Exposed metal that is not painted that has rusted shall be brushed down with steel brush to remove rust and other spots and left smooth and clean e l Upon completion of the entire work covered by this specification a certificate of approval from the different departments having jurisdiction shall be obtained and be delivered to the Owner After the certificates have been received and final inspection of the work has been found satisfactory by the Owner the Owner will issue to the Contractor a certificate of approval and acceptance The certificate will in no way relieve this Contractor from the terms of his guarantee END OF SECTION GENERAL CONDITIONS MECHANICAL 230010 9 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS This page intentionally left blank GENERAL CONDITIONS MECHANICAL 230010 10 2011 SHW GROUP A
90. balancing company as approved by the Engineer The cooling tower manufacturer shall include in the bid price all costs for instrumentation as well as preparation and conducting the Cooling Tower Institute field performance test Should the field performance test prove the tower performance deficient the Owner shall be reimbursed by the cooling tower manufacturer for any power increase required to meet the performance specification The tower shall be retested and certified after all deficiencies are corrected Test reports shall be submitted to the Engineer and Owner at the test conclusion by the testing company PART 3 EXECUTION 3 1 INSTALLATION A General Except as otherwise indicated install cooling tower equipment work including components and controls required for operation in accordance with manufacturer s instructions and with recognized industry practices to ensure that equipment complies with requirements and serves intended purposes B Locate units in general position indicated in relation to other work Position units with sufficient clearance for normal service and maintenance including clearance for cleaning and clearance for component replacement C Reinstall all water treatment piping connections END OF SECTION COOLING TOWER 236500 4 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 SECTION 237200 ENERGY RECOVERY HEAT PUMP
91. bottom shall have replaceable seals of butyl rubber or neoprene Side seals shall be spring loaded stainless steel Blade seals shall leak no more than 50 L s m 10 cfm per ft at 1000 Pa 4 in w g differential pressure Blades shall be airfoil type suitable for wide open face velocity of 7 5 m s 1500 fpm 6 Sections Damper sections shall not exceed 125 cm 150 cm 48 in 60 in Each section shall have at least one damper actuator 7T Linkages Dampers shall have exposed linkages Automated Logic Virginia 23 09 23 8 APS Tavlor Renovation DIRECT DIGITAL CONTROL Section 23 09 23 SYSTEM FOR HVAC Date 11 11 2011 8 Dampers internal to mechanical equipment will be supplied by the equipment vendor following these guidelines B Electric Damper and Valve Actuators 1 Stall Protection Mechanical or electronic stall protection shall prevent actuator damage throughout the actuator s rotation 2 Spring return Mechanism Actuators used for power failure and safety applications shall have an internal mechanical spring return mechanism or an uninterruptible power supply UPS 3 Signal and Range Proportional actuators shall accept a 0 10 Vdc or a 0 20 mA control signal and shall have a 2 10 Vdc or 4 20 mA operating range Floating motor actuators may be substituted for proportional actuators in terminal unit applications as described in paragraph 2 6H 4 Wiring 24 Vac and 24 Vdc actuators shall operate on Class 2 wiring 5
92. ction and maintenance of the basins even during tower operation shall be provided by louver face platforms Fan deck ladders and handrails which add to the overall height of the tower are not acceptable K Provide galvanized steel distribution basin covers with handles for ease in removal L Provide air inlet screens to prevent debris such as leaves paper etc from entering tower Screens shall be constructed of 1 x 1 hot dip galvanized wire mesh with U slip frames M Provide vibration cutout switch to de energize fan motor should vibration occur due to imbalance of the fan COOLING TOWER 236500 2 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 N Supply electric immersion heaters sized to maintain basin at 40 F at O F ambient Heater shall be the size type and electrical characteristics called for on the plans O Supplv factorv installed electric thermostat and low water protection relav and contactor Enclosures shall be weatherproof Power and control wiring shall be done by the contractor P The cooling tower shall be furnished with a control panel that ships loose for field mounting The control panel will include a variable frequency drive bypass starter contactors branch circuit protection and all electrical controls required to properly operate the cooling tower fan motor s and basin heater s with both mechanical as well a
93. des but is not limited to Graphics Record drawings Database Application programming code Documentation pode poche Automated Logic Virginia 23 09 23 6 APS Tavlor Renovation DIRECT DIGITAL CONTROL Section 23 09 23 SYSTEM FOR HVAC Date 11 11 2011 PART 2 PRODUCTS 2 1 Materials A Use new products the manufacturer is currently manufacturing and selling for use in new installations Do not use this installation as a product test site unless explicitly approved in writing by Owner Spare parts shall be available for at least five years after completion of this contract 2 2 Communication A Control products communication media connectors repeaters hubs and routers shall comprise a BACnet internetwork Controller and operator interface communication shall conform to ANSI ASHRAE Standard 135 BACnet B Install new wiring and network devices as required to provide a complete and workable control network Use existing Ethernet backbone for network segments marked existing on project drawings 2 3 Operator Interface A Operator Interface The system shall connect to the existing APS WebCTRL server B Communication Web server or workstation and controllers shall communicate using BACnet protocol Web server or workstation and control network backbone shall communicate using ISO 8802 3 Ethernet Data Link Physical layer protocol and BACnet IP addressing as specified in ANSI ASHRAE 135 BACnet Annex J C Hardware
94. e discharge air temperature is less than 40 F adj Unit Status The controller shall monitor the unit status via a current transmitter on the incoming AC power The system shall establish a baseline amp draw for the fan so that upon an increase above this baseline the draw of the compressor is shown Alarms shall be provided as follows e Fan Failure Commanded on but the status is off e Fanin Hand Commanded off but the status is on e Fan Runtime Exceeded Fan status runtime exceeds a user definable limit adj Environmental Index When the zone is occupied the controller will monitor the deviation of the zone temperature from the heating or cooling setpoint and calculate a 0 10096 Environmental Index which gives an indication of how well the zone is maintaining comfort The controller will also calculate the percentage of time since occupancy began that the Environmental Index is 7096 Automated Logic Virginia 23 09 93 B 13 or higher Optionally a weighting factor can be configured to adjust the contribution of the zone to the rollup average index based upon the floor area of the zone importance of the zone or other static criteria Aux Pan Status The controller shall monitor the aux pan water level e Pan Alarm Water in pan unit commanded off Isolation Valve The unit shall be shut down if aux pan level sensor is tripped Alarms shall be provided as follows The unit isolation valve shall be closed w
95. e of the Owner s representative 1 6 WARRANTY A Manufacturer s Warranty Minimum 25 year warranty for polyethylene piping B Special Warranty 25 years for butt fusion welds in polyethylene piping against leakage 1 7 PERMITS LAWS AND REGULATIONS A The Contractor shall procure and pay for all permits license inspections or approvals necessary for the execution of the contract B The Contractor shall comply with all laws ordinances rules orders and regulations relating to the performance of the work the protection of property the maintaining of surface passageways to buildings fences and or other facilities C All applicable Federal and State laws and regulations municipal ordinances and the rules and regulations of all authorities having jurisdiction over the project shall apply to the contractor throughout and they shall be deemed to be included in the contract as part thereof the same as though herein written out in full GEOTHERMAL SYSTEM 232113 33 3 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 D All regulations of the Occupational Safety and Health Act are in effect on this contract It will be the Contractor s responsibility to make himself aware of all appropriate County State and Federal regulations that apply to this contract E Anv violations incurred from improper execution of the above shall be paid bv the
96. each valve that must be installed with stem below horizontal plane C Coordinate with control specifications sections 230900 and 230993 3 02 GEAR OPERATIONS A Provide gear operations on all valves in six inch pipes or over 3 00 CHAIN OPERATORS A Where noted or required for inaccessible overhead valves and valves over 8 feet above floor except above finished ceilings furnish chain operated handwheels including rustproof chain and chain guide VALVES 230523 4 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 3 04 FIRE PROTECTION A All valves on water supplies serving or connecting for fire service system shall be approved by the Authority Having Jurisdiction and shall be in conformance with NFPA standards 3 05 VALVE CHARTS AND TAGS A Furnish and install on each valve a brass tag with black enamel number to indicate use securely fastened to valve wheel Also provide valve chart in frame and glass cover showing the location and use of each valve Valve charts shall be on 2000H paper printed and set in glass covered frames and hung in Boiler Room Equipment Room or where directed END OF SECTION VALVES 230523 5 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 This page intentionally left blank VALVES 230523 6 2011 SHW GROUP ARCHITECTS
97. ear to date basis Usage History The controller shall monitor and record gas meter readings so as to provide a gas consumption history Usage readings shall be recorded on a daily month to date and year to date basis Hardware Points Software Points Point Name Al BI BO BV Gas Flow Rate Demand Pea Peak Today Cs Peak Month to Date Peak Year to Date Usage Today Usage Month to Date Usage Year to Date Meter Failure Totals 1 o Total Hardware 1 mm Total Software 8 e Automated Logic Virginia 23 09 93 B 19 1 9 Water Flow Meter tvpical of 1 Water Meter The controller shall monitor the water meter for water consumption on a continual basis Monitoring shall be accomplished via a MODBUS interface to the utilitv meter meter devices including wireless devices bv others Alarm shall be generated as follows e Meter Failure Sensor reading indicates a loss of pulse output from the water meter Peak Demand History The controller shall monitor and record the peak high and low demand readings from the water meter These readings shall be recorded on a daily month to date and year to date basis Usage History The controller shall monitor and record water meter readings so as to provide a water consumption history Usage readings shall be recorded on a daily month to date and year to date basis Hard
98. eatWheelSS Binary Value Heat Wheel Start Stop no ExhaustFanSpeed Analog Value Exhaust Fan VFD Speed no ResetLockout Binary Value Reset After Alarm Lockout Yes OutdoorTemp Analog Value Outdoor Air Temperature no RunStoplInput Binary Value Shutdown Input no SpaceStaticPress Analog Value Space Static Pressure no LowLimit Binary Value Low Limit Output no EF_Alarm Binary Value Exhaust Fan Alarm no NetFanSpeed Analog Value Net Fan Speed Yes SF_SS Binary Value Supply Fan Start Stop no CO2 Analog Value Space CO2 no MinOADamperPos Analog Value Minimum Outside Air Damper Position Yes Duct Static SP Analog Value Duct Statis Pressure Setpoint Yes SpaceStaticSP Analog Value Space Static Pressure Setpoint Yes OADewptStpt Analog Value Outside Air Dewpoint Setpoint Yes Automated Logic Virginia 23 09 93 B 15 EF VFD Offset Setpoint SpaceRHSetPt UnOccDewptSP UnOccRHsetpt NetSpaceTemp NetSpaceRH HWFrstPrtctSP NetSpaceCO2 CO2 Sp NetStatic SpaceEnth OADewpoint OAEnthalpy DuctStaticPress ExhaustTemp DigitalScroll HPWaterviv A HPWaterviv B EffectSetPt FanStatus HghLwPressCtA HghLwPressCtB EffectOccup GasHeatEna GasHeatEnaStg2 SF Alarm EconoLockout CO2 DamperPos UnnOccHtgSP AFMS Setpoint AFMS IAQdamperPos Alarm Code HW VFD Speed NetOAT NetOARH HX FnB Damper NetDuctStatic ChilledWtrviv HPCktA Tmp HPCktB Temp MixeAirTemp HeadPressDO ReversingVlv HeadPressVFD Analog Value Analog Value An
99. eceive a signal from the loop water source monitor indicating that there is water flow and that the water temperature is within acceptable limits The controller shall measure the zone temperature and cycle the compressor to maintain its setpoint To prevent short cycling the stage shall have a user definable adj minimum runtime The compressor shall run subject to its own internal safeties and controls The heating shall be enabled whenever Automated Logic Virginia 23 09 93 B 12 e Outside air temperature is less than 65 F e AND the fan is on e AND the reversing valve is in heat mode The cooling shall be enabled whenever e Outside air temperature is greater than 60 F adj e AND the fan is e AND the reversing valve is in cool mode On mode change the compressor shall be disabled and remain off until after the reversing valve has changed position Alarms shall be provided as follows e Compressor Runtime Exceeded The compressor runtime exceeds a user definable limit adj Filter Hours The controller shall monitor the fan runtime Alarms shall be provided as follows e Filter Change Required Filter has been in use for more than 2200hr adj Discharge Air Temperature The controller shall monitor the discharge air temperature Alarms shall be provided as follows e High Discharge Air Temp If the discharge air temperature is greater than 120 F adj e Low Discharge Air Temp If th
100. ecification into divisions and sections is for the purpose of simplification alone Responsibility for the work of various trades shall rest with the Contractor The specifications and drawings establish the quality of materials equipment workmanship and methods of construction The Contract Documents are intended to secure for the Owner first class installation in every respect The work included under Division 23 of the specifications shall include complete mechanical systems as shown on the drawings and as specified herein Provide all supervision labor material equipment machinery and other items necessary to complete the mechanical system Labor shall be performed by skilled mechanics and the entire plant when delivered to the Owner shall be ready for satisfactory and efficient operation Minor details not usually shown or specified but necessary for the proper installation and operation shall be included in the work the same as if herein specified or shown Contractor shall coordinate all work in the building in order to facilitate the intelligent execution of the work Contractor shall assistance to the commissioning personal as needed and as required by the commissioning specification The following are approved by the owner the control system suppliers manufacturers and product lines Automated Logic Virginia Automated Logic Corporation WebCTRL The mechanical electrical contractors and the commissioning a
101. ed for up to 1 5 hp 120V 3 hp 240V or 30 amp pumps B Boiler modules shall be of gas fired condensing design with a modulating power burner and positive pressure discharge Each boiler shall be capable of 10 1 turndown of firing rate without loss of combustion efficiency Heat exchanger combustion chamber shall incorporate a helical fire tube design that will be self supporting baffle free and warranted to withstand thermal shock Heat exchanger shall be ASME stamped for working pressure not less than 150 psig Unit shall have an ASME approved relief valve with a setting of 75 psig Exhaust manifold shall be of corrosion resistant porcelain enameled cast iron with a 6 diameter flue connection Exhaust manifold shall have a gravity drain for the elimination of condensation with collecting reservoir C The flame monitoring system shall incorporate a UL recognized combustion safeguard system utilizing interrupted spark ignition and a rectification type flame sensor An electro hydraulic double seated safety shutoff valve shall be an inherent part of the gas train D Each boiler module shall incorporate electric probe type low water cutoff and dual over temperature protection including a manual reset in accordance with ASME section IV and CSD 1 Remote fault alarm contacts sensor failure detection and auxiliary contacts shall be standard equipment Boilers shall operate on 120 1 160 2 2 CONTROLS MULTIPLE CONDENSING BOILER HEATING PLANT 23
102. eed without such interferences Such coordination is of paramount importance and no request for additional payment will be considered where such request is based upon interferences between trades C Contractor shall carefully examine the Contract Documents and bring to the Owner attention any discrepancies 1 03 SITE EXAMINATIONS A All bidders prior to submitting a bid shall visit the site and thoroughly acquaint themselves with the conditions under which the work will be performed Particular attention shall be given to existing conditions B Examine all services equipment surfaces etc which this is in any way dependent upon and report to the Architect any condition which will result in less than a first class installation C Connections to existing work are shown diagrammatically These conditions shall be made as required by existing conditions D Waiver of responsibility or requests for additional payment based on lack of knowledge of conditions at the site will not be acceptable or considered 1 04 REFERENCES AND DEFINITIONS A References to catalogs standards codes specifications and recommendations etc means latest edition of such publications in effect at date of invitation to submit proposal Engineer means the SAS Directed means directed by Owner Provide means furnish and install Indicated means indicated in contract drawings Concealed means items referred to are hidden from
103. er differential pressure of 12lbj in adj The minimum speed shall not drop below 20 adj On dropping loop water differential pressure the VFDs shall stage on and run to maintain setpoint as follows e The controller shall modulate the lead VFD to maintain setpoint e Ifthe lead VFD speed is greater than a setpoint of 90 adj the lag VFD shall stage on e The lag VFD shall ramp up to match the lead VFD speed and then run in unison with the lead VFD to maintain setpoint On rising loop water differential pressure the VFDs shall stage off as follows e Ifthe VFD speeds then drops back to 60 adj below setpoint the lag VFD shall stage off e The lead VFD shall continue to run to maintain setpoint Alarms shall be provided as follows e High Loop Water Differential Pressure If the loop water differential pressure is 25 adj greater than setpoint e Low Loop Water Differential Pressure If the loop water differential pressure is 25 adj less than setpoint Loop Bypass Flow Control Shunt Flow Control The overall field flow cannot exceed 450 GPM The field bypass valve located in the shunt line shall modulate to maintain a maximum flow of 450 GPM at the main geothermal flow meter New Geothermal Field Control Automated Logic Virginia 23 09 93 B 4 Each of the 5 new geothermal field circuits shall have a freeze protection circulator pump This pump shall run to prevent freezing in the circuit manifold
104. erature transmitters shall each receive its power input and send its current output 4 20mA over the same pair of low voltage wires Each transmitter head shall be explosion proof The temperature probe shall use a platinum wire wound sensing element in a 316SS sheath spring loaded and inserted into a 3 4 NPT stainless steel thermowell with explosion proof process fittings and connection head The thermowell shall penetrate one half the pipe diameter The temperature range shall be 32 122 Deg F 0 50 Deg C for chilled or condenser water and 32 392 Deg F 0 200 Deg C for hot water For applications measuring the supply and return temperatures for a loop type water system the two probes shall be a matched pair The total system accuracy of the temperature transmitter probe assembly shall be 01 00 HYDRONIC SPECIALTIES 230524 3 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 of span the sensing element and the transmitter shall be individually calibrated and traceable to NIST The stability of the transmitter probe assembly shall be 0 01 of span Deg C change in ambient temperature 0 001 of span volt change in line voltage and 0 001 of span 100 ohms of lead resistance Wiring installed by the contractor between the control system and the transmitters shall be equal to Belden 9320 2 wire shielded twisted cable and shall not
105. es shall be direct drive without the use of belts or adjustable sheaves 2 Manufacturer shall provide a variable frequency drive for each fan section 3 4 Variable frequency drive shall be located in an enclosed compartment outside of the supply or Variable frequency drive shall be mounted wired and programmed by the manufacturer exhaust air stream Fan wheels shall have backward inclined blades constructed out of corrosion resistant fiber reinforced polyamide Fan wheel shall be tested in accordance to AMCA 210 4 2 Motors 1 2 Fan motor shall be VFD rated ODP type EPACT compliant Fan motor shall be of premium efficiency PE 5 DAMPERS 5 1 Motorized dampers 1 2 8 Frame shall be constructed of a 16 gage galvanized steel hat channel Blades shall be constructed of 16 gage galvanized steel strengthened by three longitudinal 1 inch deep vee grooves 3 Blades shall be symmetrical relative to its axle pivot point 4 Axle bearings shall be synthetic sleeve type and rotate inside extruded holes in the damper frame 5 Blade seals shall be extruded vinyl permanently bonded to the appropriate blade edges 6 7 Modulating spring return actuators shall be provided by the factory installed on the damper and Frame shall include flexible stainless steel compression type jamb seals wired to the control center Damper leakage shall be no more than 5 cfm sq ft at 1 in wg static pressure 6 FILTE
106. et fusion tvpe ASTM D 2683 3 Install as a U configuration at bottom of well U bend fitting shall be factorv installed C Acceptable Manufacturers 1 Charter Plastic 2 Performance Pipe 3 Endot Industries 4 Flying W Plastics D Joining and Sealant Materials Thread Sealant 1 Lake Chemical Co Slic Tite 2 Locite Corp pipe sealant with Teflon E Packing Materials for Building Construction Penetrations GEOTHERMAL SYSTEM 232113 33 4 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 1 Oakum FS A A 1186 2 2 TESTING MATERIALS A Test Equipment and Instruments Type and kind as required for the particular system under test B Test Media air gas water As specified for the particular piping or system being cleaned C Cleaning Agent chemical solution water As specified for the particular piping apparatus or system being cleaned PART 3 EXECUTION 3 1 INSTALLATION GENERAL A Install the work of this section in accordance with the manufacturer s printed installation instructions 3 2 MOBILIZATION DEMOBILIZATION A Mobilization shall consist of furnishing at the project site labor power supplies tools equipment and performing operations in connection with the completion of the pressure testing and connection of the existing geothermal heat exchanger to the new system B Demobilization shall consist of the
107. eturn manifold in the boiler room Work includes but is not limited to piping valves hangers fittings insulation and pumps Refer Mechanical Drawings and Specification for details This unit price shall apply to each functional geothermal well in Circuits 1 4 that is to be connected to the new manifold cy UNIT PRICE NO 2 CIRCUIT 5 ALTERNATE BID ITEM 5 Provide all materials and labor required to connect existing geothermal piping above ceiling capped off and identified by scope of work required by Alternate Bid to new supply and return manifold in the boiler room Work includes but is not limited to piping valves hangers fittings insulation and pumps Refer Mechanical Drawings and Specification for details This unit price shall apply to each functional geothermal well that is to be connected to the new manifold This unit price shall apply to each functional geothermal well in Circuit 5 that is to be connected to the new manifold cy AWARD OF BID Award will be based on the Total Base Bid amount entered on the BID FORM eT Oe My signature certifies that this firm or individual has no business or personal relationships with any other companies or persons that could be considered as a conflict of interest or potential conflict of interest to Arlington Public Schools and that there are no principals officers agents employees or representatives of this firm that have any business or personal relationships with any
108. fied sequence of operation stainless steel water level sensing electrodes with brass holder Schedule 40 PVC standpipe assembly with vent holes and all necessary stainless steel mounting hardware Provide PVC union directly below the control enclosure to facilitate the removal and access of electrodes and control enclosure The number and position of water level sensing electrodes shall be provided to sense the following high water level low water level high water alarm level and low water alarm A slow closing solenoid valve shall be provided with the electric water level control system for remote mounting either at the cooling tower or in the mechanical room as indicated on the mechanical drawings The solenoid valve shall supply makeup water to the open loop condenser water system on demand from the tower level controller The control panel shall come fully assembled internally wired and bench tested prior to shipment Provide an aluminum ladder for access to the top of the cooling tower Ladder shall extend from the roof to the top of the cooling tower Provide a safety cage attached to the top of the ladder Cooling tower performance shall be certified by the Cooling tower institute as provided in standard STD 201 or lacking such certification a field performance test shall be conducted within the one year warranty period and in accordance with CTI Acceptance Test Code ATC 105 The test shall be supervised by an independent test and
109. gent shall thoroughly coordinate their respective disciplines work with Automated Logic see specification sections 230900 and 230993 The owner will have a separate from this contract with Automated Logic The contractor should reference Spec Section 00700 Part 7 1 02 CONTRACT DOCUMENTS A The drawings and specifications cover the extent and general arrangement of the various systems subject to the individual characteristics of the mechanical equipment with the regard to size and arrangement The mechanical and electrical drawings shall be considered as being diagrammatic The attention of the Contractor is called to the fact that while these drawings are generally to scale and are made as accurately as the scale will permit all important dimensions shall be determined in the field They are not to be considered as erection or shop drawings They do not indicate every fitting elbow offset valve pullbox etc which is to complete the job Contractor shall prepare field erection drawings as required for the use of his mechanics to insure proper installation GENERAL CONDITIONS MECHANICAL 230010 1 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 B Interference between trades must be determined before the work is fabricated or installed The Contractor must coordinate the work during the preliminary stages to insure that actual erection will proc
110. ght through type as indicated Valve shall have adjustment features for balancing and memory stop for return to setting after shutoff Check valve disc shall be quiet operating and provide tight shutoff in closed position Valves shall have cast iron body bronze trim stainless steel stem teflon asbestos packing and shall be suitable for working pressures to 175 psi and temperature to 300 F Manufacturers Bell amp Gossett Mueller Taco Armstrong PRESSURE AND TEMPERATURE TEST PLUGS A Provide where indicated P amp T Test Plug Pete s Plug 1 4 MPT fitting to receive either a temperature or pressure probe 1 8 OD Fitting shall be solid brass with valve core of Nordel Max 275 degrees F fitted with a color coded and marked cap with gasket and shall be rated at 1 000 psig Provide two sets of temperature and pressure probes DIFFERENTIAL PRESSURE TRANSMITTERS A Provide complete self contained variable capacitance type differential pressure transmitters equal to a Rosemount Smart Transmitter No 1151 The transmitters shall be installed by the contractor where indicated on the drawings Wiring terminals and electronics shall be in separate compartments so the electronics remain sealed during installation Reverse polarity protection shall be included to keep wiring mishaps from damaging the transmitter Wiring between the control system and the transmitter shall be Belden 9320 two wire shielded twisted cable and shall no
111. glass reinforced polyester FRP D Steel cold water basin shall be self cleaning and include depressed center sump with drain and clean out connections Suction connection shall be provided with anti cavitation device and strainers E Hot water distribution basins shall be open gravitv tvpe with distribution weirs and plastic metering orifices to assure even distribution of water over wet deck surface F Wet deck shall be manufactured and performance tested by the cooling tower manufacturer and shall be 20 mils thick polyvinyl chloride wave formed sheets It shall have a flame spread rate of 5 per ASTM E84 77a and shall be Factorv Mutual approved G The drift eliminators shall be PVC as specified above Thev shall have a minimum of three distinct changes in air direction and limit drift loss to less than 0 2 of the total water circulated H Fans shall be cast aluminum fixed pitch with a minimum of six blades driven through a one piece multi groove POWERBAND or gear reducer Fan shall discharge through a steel fan cvlinder designed for streamlined air entrv and minimum tip loss for maximum fan efficiencv Fan discharge shall include a heavv gauge wire fan guard Fan shall be a low sound fan to keep tower noise down l Fan motor shall be totally enclosed 1800 RPM squirrel cage ball bearing type with special moisture protection on windings shafts and bearings J Louver Face Platform Easy access to the hot water basins for inspe
112. he heater plate shall be electrically heated and thermostatically controlled The surface shall be smooth with a high quality non stick coating The heater shall be capable of quick heat up and maintaining a constant surface temperature in the desired temperature range even in inclement conditions The heater plate shall be equipped with a thermometer to monitor proper temperature 3 7 PIPE CLEANING AND TESTING A Preliminary Work Thoroughly clean pipe and tubing prior to installation During installation prevent foreign matter from entering systems Prevent if possible or remove obstructions from piping and systems B Flushing Purging Pressure and Flow Testing GEOTHERMAL SYSTEM 232113 33 6 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 1 2 3 4 3111 003 00 All fusion joints and loops lengths shall be checked to verify that no leaks have occurred in shipping or in fusion joining All loops will be pressure tested Heat exchangers will be tested as specified in section 3 9 Cleaning Upon completion of the pressure testing completely flush the geothermal earth coupled heat exchanger with clean water Continue flushing at a velocity high enough not less than 2 ft sec to remove all air from piping system Do not use chemical cleaning solutions Keep the earth coupled heat exchanger completely disconnected from the indoor piping sys
113. hen the unit is commanded off Hardware Points Software Points Point Name Al AO BO AV BV Sched Trend Alarm Show On Graphic Zone Temp i PI s x Zone Setpoint Adjust gt Discharge Air Temp EN ENE SEM EE NEM Unit Fault Ix Po d gt Zone Override K Oo d gt Unit Status ian ee Pan Alarm ED ee ee Fan Start Stop EN EN are gt Compressor Start Stop mes BEEEXHE NE NEM Reversing Valve aes _ IEEE Heating Stage 1 Shutoff Valve H ef Environmental Index Percent of Time Satisfied x Compressor Soft Shutdown Schedule Heating Setpoint M EF SEE Cooling Setpoint 1 High Zone Temp Low Zone Temp MEME hts uper x Compressor Runtime Exceeded _ Filter Change Required xp ce High Discharge Air Temp ERE BE ho ug 8 Low Discharge Air Temp ps Fan Failure ERI fre 0 Fan Runtime Exceeded H Totals ESE ee Total Hardware 12 Automated Logic Virginia Total Software 31 23 09 93 B 14 1 5 Enegy Recovery Unit 1 5 amp 6 7 typical of 7 The energy recovery units shall run on their own internal controls The BAS shall command the unit enable and reset the unit discharge setpoints Additionally the BAS shall have the ability to override the start stop and speed of the fans and the positi
114. hold same steady positive pressure before and after opening drain valve Flushing shall continue until clean water is shown leaving open drain In no case shall flushing period be less than two hours Supplemental heater and circulation pump shall be shut off All drains and vents shall be opened to completely drain down system Short circuited supply and return run outs at each heat pump shall not be reconnected permanently to respective inlets and outlets on each machine A commercial brand of Teflon ribbon pipe thread sealer shall be used when making up connections to minimize fouling of tubes HEAT PUMP SYSTEM CLOSED CIRCUIT TYPE GEOTHERMAL SYSTEM 238146 4 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 System shall be refilled for operation under normal closed loop conditions Contractor shall add trisodium phosphate in an aqueous solution to the system prepared at proportions of one pound per 50 gallons of water in the system After system is filled with this solution the pump should be started trapped air vented drains closed and the supplemental heater set for 100 degrees F temporary setting for operating control and high limit Solution shall circulate for approximately three 3 hours Mechanical Engineer shall be given notice of this cleaning and if the Mechanical Engineer s representative deems necessary the cleaning operation shall be
115. hose 2 System shall be filled at city water make up connection with all air vents open After filling vents shall be closed 3 Contractor shall start main circulator with pressure reducing valve make up open Vents shall be checked in sequence to bleed off any trapped air in order to secure circulation through all components of the system 4 Contractor shall in turn energize supplemental heat source and set control to 90 degrees F loop temperature Power must be set off to all heat pumps and heat rejecter motors 3 03 CLEANING AND FLUSHING THE WATER CIRCULATION SYSTEM A Extreme caution shall be exercised by Contractor to prevent dirt and other foreign matter from entering pipes or components of system during construction Pipe stored on project shall have open ends capped and equipment shall have all openings fully protected Before erection each piece of pipe fitting or valve shall be visually examined and all dirt removed With system filled circulation established trapped air vented and supplemental heater on contractor shall check water thermostats installed at key points of system to determine that loop temperature is approximately 90 degrees F Any leaks in piping shall be repaired before proceeding Drain at lowest points of system which shall be opened for initial flush and blowdown making sure city water fill valves are set to make up water at same rate Check pressure gauge at pump suction and manually adjust make up to
116. imilar Threaded Piping Make up connection with a threaded coupling or with companion flanges b Joining Dissimilar Non Threaded Piping Make up connection with adapters recommended by the manufacturer s of the piping to be joined 3 6 INSTALLATION EQUIPMENT A The fusion machine shall encompass the following feature T Guide rods shall be in the plans that passes through the centerline of the pie thus canceling the bending forces in the machine caused by the fusion forces The combination butt saddle machine must have a mechanical advantage of at least 5 5 to 1 in the butt fusion mode and 2 5 to 1 in the saddle fusion mode A butt fusion only machine must have a mechanical advantage of at least 10 to 1 and saddle fusion only machine must be capable of applying at least 600 Ibs of thrust The pipe clamps shall have the strength to Around up the pipe close to the fusion joint They must be adjustable for removal of high low mismatch of pipe walls and clamp each piece on a continuing straight centerline The pipe facing device shall be capable of rapid facing of the pipe ends to a perfectly flat surface so when the ends are brought together there is 10096 plastic contact The facer shall be hand powered for pipe sizes up to 2 electrically powered up to 8 and hydraulically powered for sizes larger than 8 The facer shall have precisely machined stops to lock the facer squarely between the clamping jaws at the end of face off T
117. imit flow to maximum flow rate with 5 accuracy d Valve shall have EPDM O rings behind the seals to allow for a minimum close off pressure of 100 psi with 35 in Ibs of torque for 1 2 2 sizes e Actuator shall provide minimum torque required for full valve shutoff position 11 Isolation Ball Valve 1a Valve shall include a 600 WOG manual isolation ball valve 12 Pressure Independent Control Valves and Pressure Dependent Control Valves shall be by Belimo Controls or pre approved equal 13 The control valve actuator may be furnished by the ATC contractor The controls contractor is responsible for wiring and testing the valve actuators 14 All components shall be warranted by manufacturer for no less than one year from date of purchase U Calibrated Balance Valves geothermal circuits Circuit Setter Plus Bell and Gossett or approved equal V This is a composite list of valves all types may not be used on this project PART 3 EXECUTION 3 01 INSTALLATION A Install valves where required for proper operation of piping and equipment including valves in branch lines where necessary to isolate sections of piping Locate valves so as to be accessible and so that separate support can be provided when necessary B Install valves with stems pointed up in the vertical position where possible but in no case with stems pointed downward from a horizontal plane unless unavoidable Install valve drains with hose end adaptor for
118. in 5 then a passing test is indicated The following geothermal piping shall be tested under this contract Fifteen 15 geothermal circuits which connect the 56 boreholes East side to the geothermal manifolds in the mechanical room Thirty six 36 individual boreholes located on the South West and North sides of the building Refer to the new construction an existing as built drawings for the geothermal piping location END OF SECTION GEOTHERMAL SYSTEM 232113 33 8 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 SECTION 235216 MULTIPLE CONDENSING BOILER HEATING PLANT PART 1 GENERAL 1 1 DESCRIPTION A Manufacturer shall provide boilers in accordance with all codes and authorities having jurisdiction drawings schedules and specifications Mechanical contractor shall receive and install the boilers according with this specification drawings manufacturer and owner requirements Boilers shall be UL FM approved Boiler manufacturers Lochinvar AERCO International Inc or approved equal 1 2 SUBMITTALS A Submit manufacturer s data on showing complete performance capacity B Submit dimensioned drawings of boilers showing accurately scaled boilers and components include layouts and space relationships to associated piping and equipment C Provide appropriate Certificates of Shop Inspection and Field Assembly Inspection as
119. ing and superheat on circuit A with hot gas reheat valve open 100 after 15 minutes of steady state operation 6 3 Measure and record subcooling and superheat on circuit B after 15 minutes of steady state operation 12 4 Test report shall be included with unit and available from the factory upon request END OF SECTION ENERGY RECOVERY HEAT PUMP UNIT 237200 6 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 SECTION 238146 HEAT PUMP SYSTEM CLOSED CIRCUIT TYPE GEOTHERMAL SYSTEM PART 1 GENERAL 1 01 DESCRIPTION A Provide high efficiency heat pump system and equipment as shown on the drawings and in accordance with schedule and specifications Contractor shall install Owner provided water to air heat pump units where shown on plans and as listed in the schedule Heat Pump units shall be UL approved and carry UL re examination marker All units shall be furnished with random start control to insure staggered morning restart Basis of design Trane The following alternate manufacturers are acceptable if they fully comply with the specifications Carrier Water Furnace McQuay or Florida Heat Pump Equipment shall be completely assembled piped internally wired and computer run tested at the factory Equipment Manufacturer shall provide computer test results upon request of owner It shall be both ETL and ISO ARI 13256 1 Standard ISO
120. installed pressure gauges and thermometers are required to be installed on the geothermal circuits as indicated on the flow diagram drawing M5 1 The existing supply and return manifolds in the mechanical room shall be extended by 48 to accommodate the new circuits see the mechanical drawings Under the Base Bid the remaining thirty six 86 individual boreholes shall be disconnected from the existing console heat pump units and shall be abandoned in place Under the Alternative Bid 1 though 5 the thirty six 36 individual boreholes shall be pressure tested prior to connecting them to the new copper manifolds If the borehole piping is determined to be leaky it shall be capped Just the functional not leaky boreholes shall be connected to the new system A copy of the pressure test report shall be provided to the Owner Architect and Engineer Refer to the architectural spec for the Alternatives description The four 4 new copper manifolds should be installed in the crawl space existing steam tunnels The one 1 new copper manifold is located above ceiling in Area D 1 5 SEQUENCING AND SCHEDULING A Transmit written notification of proposed date and time of pressure and operational tests to the Owner s representative at least 5 days in advance of such tests Pressure test of the existing boreholes geothermal piping has to be conducted within the first 30 days of the contract B Perform cleaning and testing work in the presenc
121. ion Decisions of the Owner as to whether a product proposed for substitution is fully equal will be final and not subject to arbitration Where products are named in the specification but are unaccompanied by the phrases or equal or approved equal or their equivalent applications for approval of substitute products will not be considered at any time C When any specified item or approved equal item of equipment or material is submitted which required changes or additions to the designed structures finish or Plumbing Heating Ventilating and or Electrical services because its requirements exceed or are different from those shown on the Contract Documents such changes shall be made at no additional cost to the Owner and shall be itemized in writing and attached to the submittal No changes shall be made without approval in writing from the Owner The requirements of this paragraph apply also when no manufacturer is named and when more than one manufacturer is listed as acceptable D Coordinated shop drawings drawn to a scale of 2 inch to the foot shall be submitted for approval The mechanical contractor shall have employed or available for his use persons skilled in producing shop drawings coordination drawings and that are capable of producing these in a timely fashion so as not to impede progress or cause delay in execution of the work The coordinated shop drawings shall coordinate and show architectural features structural features
122. irginia Department of Professional and Occupational Regulation Virginia Board for Contractors to perform the scope of work included in this Bid Include license number below Registered as a Contractor under Title 54 1 Chapter 11 of the Code of Virginia Licensed Class Virginia Contractor No Valid until Date Classifications Bidder has examined copies of all the Contract Documents and of the following addenda and receipt of all is hereby acknowledged Addendum No Dated Addendum No Dated Addendum No Dated Addendum No Dated Addendum No __ Dated Addendum No Dated BID FORM 00420 3 TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 12 13 ANY NOTATION ON THE EXTERIOR OF THE ENVELOPE PURPORTING TO ALTER AMEND MODIFY OR REVISE THE BID CONTAINED WITHIN THE ENVELOPE SHALL BE OF NO EFFECT AND SHALL BE DISREGARDED BID SCHEDULE My Bid to provide all labor materials and equipment necessary to complete the work described in this Invitation to Bid is provided in this Bid Schedule BID ITEM 1 TOTAL BASE BID In Writing In Figures BID ITEM 2 PRICING BREAKDOWN FOR TOTAL BASE BID ABOVE Provide Lump Sum prices per Division as listed in the Project Manual Table of Contents A Division 1 Dollars B Division 2 Dollars Division 4 Dollars D Division 5 Dollars E Division 7 Dollars 7 F Division 9 Dollars G Division 23 Dol
123. itions without extra charge 2 Coordinate and schedule work with other work in the same area and with work dependent upon other work to facilitate mutual progress B Test and Balance 1 Provide Test and Balance Contractor a single set of necessary tools to interface to control system for testing and balancing 2 Test and Balance Contractor shall return tools undamaged and in working condition at completion of testing and balancing C Life Safety 1 Duct smoke detectors required for air handler shutdown are provided under Division 28 Interlock smoke detectors to air handlers for shutdown as specified in Section 23 09 93 Sequence of Operations for HVAC Controls 2 Smoke dampers and actuators required for duct smoke isolation are provided under Division 23 Interlock smoke dampers to air handlers as specified in Section 23 09 93 Sequence of Operations for HVAC Controls Automated Logic Virginia 23 09 23 12 APS Tavlor Renovation DIRECT DIGITAL CONTROL Section 23 09 23 SYSTEM FOR HVAC Date 11 11 2011 3 Fire and smoke dampers and actuators required for fire rated walls are provided under Division 23 Fire and smoke damper control is provided under Division 28 3 4 General Workmanship A Install equipment piping and wiring or raceway horizontally vertically and parallel to walls wherever possible B Provide sufficient slack and flexible connections to allow for piping and equipment vibration isolation C Install
124. kaged equipment shall be independently Third Party as a system for it s intended use by a Nationally Recognized Testing Laboratory NRTL in accordance with GENERAL CONDITIONS MECHANICAL 230010 3 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 OSHA Federal Regulations 29CFR1910 303 and 399 as well as NFPA Pamphlet 70 National Electric Code NEC Article 90 7 F All adhesives sealants and welding solvents shall have no more than the following VOC content PVC Welding 510 g L CPVC Welding 490 g L ABS Welding 325 g L Plastic Cement Welding 250 g L Adhesive Primer for Plastic 550 g L All Other Welding amp Installation Adhesives amp Sealants 250 g L 2 03 MECHANICAL SUBMITTALS SHOP DRAWINGS AND SAMPLES A Submit in accordance with the General Conditions of the contract and the additional stipulations and format set forth herein B Where one or more products are named in the specifications and the phrases or equal approved equal or their equivalent accompanies the listing requests for approval of substitute products will be considered after award of contract only Requests shall be made in writing including all information such as delivery dates and descriptive data and all samples required by the Owner together with the amount to be added to or deducted from the contract price for such substitut
125. l be six daily time periods in which the demand shall be adjusted on three levels These demand levels shall be available for facility equipment to utilize for demand limiting e Demand Level 1 Power consumption has exceeded the first demand level threshold adj e Demand Level 2 Power consumption has exceeded the second demand level threshold e Demand Level 3 Power consumption has exceeded the third demand level threshold adj A 2 Hardware Points Software Points Point Name al AO x kW Pulse Alarm Show On Graphic Current Demand Level kW Demand kW Peak Today kW Peak Month to Date kW Peak Year to Date kWh Today MWh Month to Date MWh Year to Date x Meter Failure x Demand Level 1 Automated Logic Virginia 23 09 93 B 17 Point Name Demand Level 2 Demand Level 3 2 Total Hardware 1 Total Software 12 Automated Logic Virginia 23 09 93 B 18 1 8 Gas Meter tvpical of 1 Gas Meter The controller shall monitor the gas meter for gas consumption on a continual basis These values shall be made available to the svstem at all times Alarm shall be generated as follows e Meter Failure Sensor reading indicates a loss of pulse output from the gas meter Peak Demand History The controller shall monitor and record the peak high and low demand readings from the gas meter Peak readings shall be recorded on a daily month to date and y
126. lable for use in providing accurate demolition pricing Answer Answered in Addendum 1 PB 012 Please provide which roofing contractor carries the warranty on the existing roof if there is one Answer Answered in Addendum 1 PB 013 Are the existing steam tunnels going to be considered confined space Answer The contractor is to verify the existing conditions affecting the work and shall comply as necessary refer to Specification Section 00700 General Conditions Part 12 PB 014 Please provide drawings or details showing actual location of existing geothermal wells Answer Refer to the as built drawing G 1 issued in Addendum 1 PB 015 Please provide drawings or details for geothermal circuit 5 Answer See revised sheet M5 1 included in this addendum PB 016 Page 2 of the invitation for bid scope of work advises the temperature controls contractor will be under a separate contract with APS Can their scope of work be issued to coordinate with equipment vendors Answer The controls Specification Sections 230900 and 230993 are included in this addendum ADDENDUM 2 TO BID 37FY12 Page 1 of 3 PB 017 Does the existing RUDD AC unit get removed from the site per drawing A2 0 Answer Yes all the existing split AC units shall be removed PB 018 The IFB Page 3 indicates the contractor shall work during unoccupied hours such as nights amp weekends until total building is available for construction on June 25th 2012 Can work i
127. lars H Division 26 Dollars l Total must equal base bid Dollars BID ITEM ADDITIVE BID ITEMS The undersigned proposed to modify the BASE BID as stated below The amounts to be added to the BASE BID reflect any modifications of work that the undersigned may be required to perform by reason of acceptance of the Alternate Bid Item Alternate Bid Items may or may not be accepted ALTERNATE BID ITEM NO 1 Following removal and disposal of the classroom heat pump units included in the Base Bid the work of Alternate No 1 includes Removal of all supply and return piping between the points of entry into the crawl space and the disconnected classroom heat pump unit pressure testing each of thirteen 13 wells in accordance with Specification Section 232113 33 identification of functioning non functioning wells capping of all geothermal piping after pressure testing and cleaning of the work area State the amount to be added to the Base Bid to provide all work described above BID FORM 00420 4 TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 ADD Dollars 00 ALTERNATE BID ITEM NO 2 Following removal and disposal of the classroom heat pump units included in the Base Bid the work of Alternate No 2 includes Removal of all supplv and return piping between the points of entrv into the crawl space and the disconnected classroom heat pump unit pressure testing each of four 4
128. ler mechanical room and steam tunnels March 30 2012 Total building available for construction work June 25 2012 Building Substantial Completion August 13 2012 Final Completion of the project August 31 2012 xdi i enr These dates are subject to adjustments of this Contract Period as provided in the Contract Documents b Owner and Contractor agree that as liquidated damages for delay but not as a penalty the Contractor shall pay Owner 1 000 00 for each day that expires after the time specified in Paragraph 5 of the Agreement between Owner and Contractor Section 00400 for substantial completion plus any approved time extensions until all of the Work is substantially complete and Contractor shall pay Owner 1 000 00 for each day that expires after the time specified in Paragraph 5 of the Agreement between Owner and Contractor Section 0400 for final completion plus any approved proper time extensions until all of the Work is finally complete The following documents are attached to and made part of this Bid a Required Bid Security in the form of either a certified check cash escrow or Bid Bond in the amount of five percent of the Bid amount b List of Subcontractors as required in Instructions to Bidders By submitting this Bid the Bidder certifies that the firm submitting this Bid and registered under that name has the appropriate license and or certification as determined by the Commonwealth of V
129. monstrate proper system operation shall be repeated after Contractor makes necessary repairs or revisions to hardware or software to successfully complete each test B Acceptance 1 After tests described in this specification are performed to the satisfaction of both Engineer and Owner Engineer will accept control system as meeting completion requirements Engineer may exempt tests from completion requirements that cannot be performed due to circumstances beyond Contractor s control Engineer will provide written statement of each exempted test Exempted tests shall be performed as part of warranty 2 System shall not be accepted until completed demonstration forms and checklists are submitted and approved as required in Section 23 09 23 Article 1 10 Submittals 3 18 Cleaning A Each day clean up debris resulting from work Remove packaging material as soon as its contents have been removed Collect waste and place in designated location B On completion of work in each area clean work debris and equipment Keep areas free from dust dirt and debris Automated Logic Virginia 23 09 23 17 APS Tavlor Renovation DIRECT DIGITAL CONTROL Section 23 09 23 SYSTEM FOR HVAC Date 11 11 2011 This page intentionally left blank Automated Logic Virginia 23 09 93 B 1 Section 23 09 00 Instrumentation and Control for HVAC Arlington Public Schools Taylor Elementary School HVAC Renovation Automated Logic Virginia 23 09 93 B 1
130. mp 5 The control valve shall accurately control the flow from 0 to 100 full rated flow 6 A flow tag shall be furnished with each valve 7 A universal mounting plate shall allow installation of actuators meeting the system electrical requirements and valve torque requirements as provided by Belimo ELO Drive Honeywell Invensys Johnson Controls KMC Neptronics or Siemens 8 The actuator and plate can be rotated after mounting 9 Pressure Compensating Cartridge PCC a PCC shall automatically compensate for pressure changes in valve and shall maintain a constant pressure drop across the flow limiting actuated ball o The operating pressure range shall be available with the minimum range requiring 5 8 PSID to actuate the mechanism c Valve internal control mechanism includes a diaphragm and full travel linear coil spring d Valves shall include an accessible replaceable cartridge e Dual pressure temperature test valves for verifying the pressure differential across the cartridge and flow limiting ball shall be standard 10 Actuated Ball Valve a Valve ball shall consist of chemically plated nickel brass or stainless steel VALVES 230523 3 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAVLOR ELEMENTARV SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 b Actuator stem shall be removable replaceable without removing valve from line c Manufacturer shall be able to provide ball insert to l
131. mp From Network Outside Air Humidity From Network Flat Plate Heat Exchanger Damper Position Duct static pressure input from network Chilled Water Valve Position Heat Pump Circut A Temperature Heat Pump Circut B Temperature Mixed Air Temperature Head Pressure Digital Output Heat Pump Reversing Valve Head Pressure VFD Speed Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes no no no no no no no no no no no no no no no no Yes Yes Yes Yes no no no no Yes Yes no Yes no no no no no no no 23 09 93 B 16 1 7 Electric Meter tvpical of 1 Electric Meter The controller shall monitor the electric meter for electric consumption on a continual basis These values shall be made available to the svstem at all times Alarm shall be generated as follows e Meter Failure Sensor reading indicates a loss of pulse output from the electric meter Peak Demand History The controller shall monitor and record the peak high and low demand readings from the electric meter Peak readings shall be recorded on a daily month to date and year to date basis Usage History The controller shall monitor and record electric meter readings so as to provide a power consumption history Usage readings shall be recorded on a daily month to date and year to date basis Demand Levels The controller shall set the system demand level adj based on the current power consumption readings from the electric meter There shal
132. n the mechanical room be done on normal hours since this area is accessible without entering the building Answer Yes but this work must be coordinated and approved in advance by Arlington Public Schools and the school administration PB 019 General Conditions Section 00700 page 15 section 5 9 E states there will need to be a chain link fence to enclose the construction area Will this only be required at the contractor s temporary facilities and storage area Answer Yes the area is defined on sheet G0 0 PB 020 Is the name of the geothermal contractor that performed the original installation of the wells and piping available Answer Yes it is Thermal Loop Corporation www thermalloopcorp com DRAWINGS FULL SIZE DRAWINGS SEE ATTACHMENT A Architectural 1 SHEET GO0 0 Revise Milestone Schedule to show August 13 as the date of Substantial Completion Revise Milestone Schedule to show August 31 as the date of Final Completion Mechanical SHEET M2 1 SHEET M2 2 SHEET M3 1 SHEET M5 1 mom SPECIFICATIONS FULL SPEC SECTIONS SEE ATTACHMENT B SECTION 000001 TABLE OF CONTENTS a Addcategory SPECIFICATIONS FOR INSTRUMENTATION AND CONTROL FOR HVAC SEPARATE CONTRACT Add section 230923 DIRECT DIGITAL CONTROL SYSTEM FOR HVAC c Add section 230993 SEQUENCE OF OPERATIONS FOR HVAC CONTROLS SECTION 00400 AGREEMENT BETWEEN OWNER AND CONTRACTOR a Revise paragraph 5 6 to read
133. nection 9 2 Units shall be wired according to NEC and listed per ETL 9 3 ETL listing shall cover all components of the ventilator and not be limited to the control panel 9 4 All major electrical components shall be UL listed 9 5 Unit shall be constructed with an integral control center isolated from supply airflow exhaust airflow compressors and heating elements 9 6 The following items shall be provided and wired within the control center by the factory 1 Non Fused disconnect 2 Sub circuit fusing 3 Low voltage transformers 4 Control circuit fusing 5 Terminal block 6 Fan motor variable frequency drives 9 7 Electrical panel must house all high voltage components such as terminal blocks variable frequency drives and fuse blocks 1 Control panel shall include a factory supplied and mounted 115V GFCI convenience outlet receptacle with a 12A circuit breaker Outlet shall be powered by factory 2 Unit shall include a factory supplied mounted and wired electric heating element in the control panel to maintain a minimum of OF in the panel 3 Unit shall include a factory supplied mounted and wired phase and voltage monitor 10 CONTROLS Coordinate with the control specifications sections 230900 and 230993 The control system will be installed under separate contract between the Owner and Automated Logic ALC ERU s control and control sequence should be coordinated between the manufacturer ALC and the Owner Any changes
134. neral Mount actuators and adapters according to manufacturer s recommendations B Electric and Electronic Damper Actuators Mount actuators directly on damper shaft or jackshaft unless shown as a linkage installation Link actuators according to manufacturer s recommendations 1 For low leakage dampers with seals mount actuator with a minimum 5 travel available for damper seal tightening 2 To compress seals when spring return actuators are used on normally closed dampers power actuator to approximately 5 open position manually close the damper then tighten linkage 3 Check operation of damper actuator combination to confirm that actuator modulates damper smoothly throughout stroke to both open and closed positions 4 Provide necessary mounting hardware and linkages for actuator installation C Valve Actuators Connect actuators to valves with adapters approved by actuator manufacturer 3 14 Identification of Hardware and Wiring A Label wiring and cabling per established owner requirements B Label identifiers shall match record documents 3 16 Control System Checkout and Testing A Startup Testing Complete startup testing to verify operational control system before notifying Owner of system demonstration Provide Owner with schedule for startup testing Owner may have representative present during any or all startup testing Automated Logic Virginia 23 09 23 15 APS Tavlor Renovation DIRECT DIGITAL CONTROL Section
135. normal sight This includes items in partly excavated or crawl spaces and in service tunnels used solelv for repairs and maintenance Exposed means items are not concealed B Where any device or piece of equipment is referred to in the singular number such reference shall be deemed to apply to as many devices as are required to complete the installation 1 05 CODES RULES AND PERMITS A Installation shall be made in compliance with all applicable state and local codes and regulations N E C and NFPA requirements and utility company rules all of which shall be considered a part of this specification and shall take precedence in the order of listing B Unless otherwise directed all connection fees to public utilities will be paid by the Contractor The Contractor shall obtain all required Certificates of Inspection for his work and deliver same to the Owner before request for acceptance and final payment for his work C Contractor shall pay for all cost of connections to and running from local utility lines whether the work is performed by this Contractor Utility Company or Government Agency 1 06 PROTECTION OF WORK AND MATERIALS A Contractor shall be responsible for the proper care and protection of all portions of all materials delivered and work performed by him until completion and acceptance of the work as a whole GENERAL CONDITIONS MECHANICAL 230010 2 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAYLOR
136. on of the dampers The sequence shall be by the unit manufacturer Units 1 5 shall control for values T H amp CO2 measured in the return air units 6 amp 7 shall control for values in the space Factory Point List Object Name Object Type Description Writeable CoolCoilTemp Analog Value Calibrated Cooling Coil Temp no OutdoorRH Analog Value Outdoor Air Relitive Humidity no SpaceRH Analog Value Space Relitive Humidity no SpaceTemp Analog Value Space Temperature no SupplyAirTemp Analog Value Supply Air Temperature no HotGasOutput Analog Value Hot Gas Reheat Valve Position no SupCoolingSP Analog Value Supply Cooling Setpoint Yes SupHeatingSP Analog Value Supply Heating Setpoint Yes UnOccClgSp Analog Value Night Cooling Setpoint Yes Compriss Binarv Value Compresor 1 Start Stop no Compr2SS Binary Value Compresor 2 Start Stop no Compr3SS Binary Value Compresor 3 Start Stop no Compr4SS Binary Value Compresor 4 Start Stop no OccSchedule Binary Value Net In Schedule Yes ElectricHeat Analog Value Electric Heat Percentage no ModGasHeat Analog Value Modulating Heat Percentage no FanOutput Analog Value Supply Fan Speed no DehumidMode Binary Value Dehumidification Mode no in alarm Binary Value Alarm Output no FilterStatus Binary Value Filter Status no OADamper Analog Value Outside Damper Position no DamperOpen Binary Value OA Damper End Switch no ExhaustFanstat Binarv Value Exhaust Fan Status no ExhaustFanSS Binary Value Exhaust Fan Start Stop no H
137. ooling tower shall be Baltimore Aircoil Company Marley Cooling Technologies Evapco or approved equal B UL Labels Provide electrical components that have been listed and labeled by Underwriters Laboratories C NEMA Compliance Comply with applicable portions of National Electrical Manufacturers Association standards pertaining to motors D The cooling tower manufacturer shall have a Management System certified by an accredited registrar as complying with the requirements of ISO 9001 2000 to ensure consistent quality of products and services E Manufacturer The cooling tower shall be Baltimore Aircoil Company Marley Cooling Technologies Evapco or approved equal F Warrantv fan fan shaft bearings mechanical equipment support and fan motor shall be warranted against defects in materials and workmanship for a period of five 5 vears from date of shipment SUBMITTALS A Submit manufacturer s data on cooling tower including certified drawings showing overall dimensions of complete assembly operating weights foundation requirements sizes and locations of connections accessories auxiliary support requirements and parts lists Include the following information 1 Performance certifications and reports 2 Wiring diagrams showing electric service for unit s electrical components safety devices and indicator lights 3 Written instructions for installation and assembly 4 Written operating instructions including start u
138. or and materials for specified control system free from defects for a period of 12 months after final acceptance Control system failures during warranty period shall be adjusted repaired or replaced at no additional cost or reduction in service to Owner Respond during normal business hours within 24 hours of Owner s warranty service request 2 Work shall have a single warranty date even if Owner receives beneficial use due to early system start up If specified work is split into multiple contracts or a multi phase contract each contract or phase shall have a separate warranty start date and period Automated Logic Virginia 23 09 23 5 APS Tavlor Renovation DIRECT DIGITAL CONTROL Section 23 09 23 SYSTEM FOR HVAC Date 11 11 2011 3 If Engineer determines that equipment and systems operate satisfactorily at the end of final start up testing and commissioning phase Engineer will certify in writing that control system operation has been tested and accepted in accordance with the terms of this specification Date of acceptance shall begin warranty period 4 Exception Contractor shall not be required to warrant reused devices except those that have been rebuilt or repaired Installation labor and materials shall be warranted Demonstrate operable condition of reused devices at time of Engineer s acceptance 1 12 Ownership Of Proprietary Material A Project specific software and documentation shall become Owner s property This inclu
139. oxide CO Carbon Dioxide CO2 10 of full scale see Note 1 5 of full scale 3 of full scale 25 Pa 20 1 in w g 3 Pa 0 01 in w g 2 of full scale see Note 2 1 of reading see Note 3 5 of reading 50 ppm Note 1 Accuracy applies to 10 100 of scale Note 2 For both absolute and differential pressure Note 3 Not including utility supplied meters Table 2 Control Stability and Accuracy Controlled Variable Air Pressure Space Temperature Duct Temperature Control Accuracy 50 Pa 0 2 in w g 3 Pa 0 01 in w g 10 of full scale 1 0 C 2 0 F 1 5 C 3 F 0 1 5 kPa 0 6 in w g 25 to 25 Pa 0 1 to 0 1 in w g Humidity Fluid Pressure 5 RH 10 kPa 41 5 psi 250 Pa 41 0 in w g Automated Logic Virginia MPa 1 150 psi 0 12 5 kPa 0 50 in w g differential 23 09 23 4 APS Tavlor Renovation DIRECT DIGITAL CONTROL Section 23 09 23 SYSTEM FOR HVAC Date 11 11 2011 1 10 Submittals A Product Submittal Requirements Provide shop drawings and other submittals on hardware software and equipment to be installed or furnished as electronic pdf files Provide submittals within 6 weeks of receipt of approved mechanical submittals 1 Direct Digital Control System Hardware a Complete bill of materials indicating quantity manufacturer model number and relevant technical data of equipment to be used b Manufacturer s desc
140. p routine and normal operations regulations and controls and shutdown for emergency PART 2 PRODUCTS 2 1 COOLING TOWER COOLING TOWER 236500 1 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 A Furnish and install as shown on the plans factory assembled Baltimore Aircoil induced draft cross flow cooling tower with vertical air discharge Unit construction shall be all hot dip galvanized steel with the Baltibond corrosion protection finish or stainless steel basin B The unit shall be suitable for applications requiring equipment anchorage to resist wind loads up to 30 psf acting on the full vertical projected area with 16 psf acting simultaneously on the full horizontal projected area or seismic forces of 161 of the operating weight acting in the horizontal direction and 24 of the operating weight acting in the vertical direction applied at the center of gravity Loads are appropriate for Seismic Zone 4 assuming an Importance factor of 1 0 and soil profile SD and rigid mounting to the supporting structure per current Uniform Building Code C Casing shall be constructed of steel panels supported by heavy gauge angle framework Access doors shall be provided for access to eliminator and plenum section Louvers shall prevent water splash out during fan cycling and be constructed of maintenance free corrosion resistant UV protected fiber
141. p Year to Dat Low Temp Today Low Temp Month to Date Low Temp Year to Date Sensor Failure Totals Total Hardware 2 Total Software 11 Automated Logic Virginia 23 09 93 B 21 This page intentionallv left blank Automated Logic Virginia 23 09 93 B 22
142. r brazed joints E Movement Stainless steel rotary type with geared adjustable micrometer pointer F Dial White background black lines and numerals G Range Select with normal operating pressure in the middle one third of scale H Manufacturers 1 Ashcroft No 1279A 2 Trerice No 450SS 3 Weiss Series UG 4 Weksler No AA1 Case P PART 3 EXECUTION 3 01 INSTALLATION A Install gauges on steam lines with coil syphon and tee handle cock B Install gauges on water lines with tee handle cock C Install gauges on pump discharges with pulsation dampener and tee handle cock D Coordinate with the control specifications sections 230900 and 230993 END OF SECTION PRESSURE GAUGES 230520 1 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 This page intentionally left blank PRESSURE GAUGES 230520 2 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 SECTION 230523 VALVES PART 1 GENERAL 1 01 DESCRIPTION A B Provide valves as shown on the drawings and as specified herein Valves shall be provided in main piping systems at their source in branches at mains and risers in lines to equipment in lines for proper servicing of accessories and in lines to groups of two or more fixtures 1 00 SUBMITTALS A Submit manuf
143. r output signal and field adjustable zero and span 2 Continuous operating conditions of positive or negative pressure 50 greater than calibrated span shall not damage transducer sensing elements 3 Water pressure transducer diaphragm shall be stainless steel with minimum proof pressure of 1000 kPa 150 psi Transducer shall have 4 20 mA output suitable mounting provisions and block and bleed valves 4 Water differential pressure transducer diaphragm shall be stainless steel with minimum proof pressure of 1000 kPa 150 psi Over range limit differential pressure and maximum static pressure shall be 2000 kPa 300 psi Transducer shall have 4 20 mA output suitable mounting provisions and 5 valve manifold K Differential Pressure Switches Differential pressure switches air or water service shall be UL listed SPDT snap acting pilot duty rated 125 VA minimum and shall have scale range and differential suitable for intended application and NEMA 1 enclosure unless otherwise specified 2 9 Wiring And Raceways A General Provide copper wiring plenum cable and raceways as specified in applicable sections of Division 26 B Insulated wire shall use copper conductors and shall be UL listed for 90 C 200 F minimum service C Class 2 wiring in concealed accessible areas shall may be plenum rated run without raceway D Wall runs for zone sensors etc on existing walls may be run in wire mould Automated Logic Virginia 23
144. rails shall be constructed of a minimum of 10 gage galvanized steel with 16 gage integral floor pan 2 Base shall have a minimum 4 overhang over the top of a roof curb to prevent water infiltration 3 All floor seams shall have a raised rib joint 4 There shall be no penetrations through the floor of the unit within the perimeter of the curb except for duct openings and utility chases 5 Penetrations through the floor shall have a 7 raised rib around each opening 3 3 Base pan 1 Base pan shall be insulated with 1 2 closed cell neoprene liner 3 4 Panels 1 Casing shall be constructed with minimum 2 inch foam injected double wall panels 2 Individual panels shall be constructed so that they are thermally broken there shall be no metal to metal contact between the interior and exterior sheet metal of each panel 3 Interior side of panel shall be 22 gage G 90 galvanized steel 4 Exterior side of panel shall be 22 gage painted steel rated for 1000 hours in accordance with ASTM B117 and ASTM D1654 5 nsulation 5 1 Insulation shall be 2 Ib ft foam insulation with an average R value of 6 per inch 5 2 Insulation water absorption must be no more that 0 038 Ib ft per ASTM D 2842 and show no growth per ASTM G21 biocide testing 5 8 Noinsulation shall be exposed to the air stream 5 4 Fiberglass insulation is not acceptable due to possibility of sloughing and moisture retention 3 5 Access doors ENERGY RECOVERY
145. range of 2096 8096 2 Duct sensors shall have a sampling chamber Automated Logic Virginia 23 09 23 10 APS Tavlor Renovation DIRECT DIGITAL CONTROL Section 23 09 23 SYSTEM FOR HVAC Date 11 11 2011 3 Outdoor air humidity sensors shall have a sensing range of 20 95 RH and shall be suitable for ambient conditions of 40 C 75 C 40 F 170 F 4 Humidity sensors shall not drift more than 1 of full scale annually G Relays 1 Control Relays Control relays shall be plug in type UL listed and shall have dust cover and LED energized indicator Contact rating configuration and coil voltage shall be suitable for application H Current Transmitters 1 AC current transmitters shall be self powered combination split core current transformer type with built in rectifier and high gain servo amplifier with 4 20 mA two wire output Full scale unit ranges shall be 10 A 20 A 50 A 100 A 150 A and 200 A with internal zero and span adjustment Unit accuracy shall be 1 full scale at 500 ohm maximum burden 2 Transmitter shall meet or exceed ANSI ISA S50 1 requirements and shall be UL CSA recognized 3 Unit shall be split core type for clamp on installation on existing wiring I Current Switches 1 Current operated switches shall be self powered solid state with adjustable trip current Select switches to match application current and DDC svstem output requirements J Pressure Transducers 1 Transducers shall have linea
146. rce Heat Pump tvpical of 1 Run Conditions Scheduled The unit shall run according to a user definable time schedule in the following modes e Occupied Mode The unit shall maintain e A 74 F adj cooling setpoint e A 7O F adj heating setpoint e Unoccupied Mode night setback The unit shall maintain e 85 F adj cooling setpoint e A 55 F adj heating setpoint Alarms shall be provided as follows e High Zone Temp If the zone temperature is greater than the cooling setpoint by a user definable amount adj e Low Zone Temp If the zone temperature is less than the heating setpoint by a user definable amount adj Zone Setpoint Adjust The occupant shall be able to adjust the zone temperature heating and cooling setpoints at the zone sensor Zone Optimal Start The unit shall use an optimal start algorithm for morning start up This algorithm shall minimize the unoccupied warm up or cool down period while still achieving comfort conditions by the start of scheduled occupied period Zone Unoccupied Override A timed local override control shall allow an occupant to override the schedule and place the unit into an occupied mode for an adjustable period of time At the expiration of this time control of the unit shall automatically return to the schedule Fan The fan shall run anytime the unit is commanded to run unless shutdown on safeties Heating and Cooling 1 Compressor Stage The controller shall r
147. removal from the construction site of all plant equipment supplies and personnel after completion of the work including the cleanup of all rubbish litter and waste materials generated by the Contractor s activities Drill cuttings are not to be utilized as part of borehole construction 3 5 INSTALLATION PIPING A Horizontal Piping 1 Separate pipes by a minimum of six 6 inches horizontally and vertically Tag header designation numbers a Minimum pipe depth 48 below finished grade b Insulate piping at wall penetrations 2 Separate supply and return lines or bundles a minimum of 6 12 inches to minimize thermal interference 3 Minimize the number of points where supply and return lines cross one another 4 Install piping of such lengths to minimize the number of fusion joints required 5 Avoid sharp bends in piping use elbows where required 6 Install bell reducing fittings or reducing tees at pipe reductions to eliminate trapped air GEOTHERMAL SYSTEM 232113 33 5 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 7 Cap open end of pipe to prevent entry of contaminants until final connections are made 8 Pressure test piping C Pipe Joint Makeup 1 Polyethylene Butt or Saddle side wall Fusion Pipe Joints Follow the manufacturer s printed installation instructions 2 Dissimilar Pipe Joints a Joining Diss
148. ription and technical data such as performance curves product specifications and installation and maintenance instructions for all provided control devices c Wiring diagrams and layouts for each control panel Show termination numbers d Floor plan schematic diagrams indicating controller locations and comm layout 2 Controlled Systems a Schematic diagram of each controlled system Label control points with point names Graphically show locations of control elements b Schematic wiring diagram of each controlled system Label control elements and terminals Where a control element is also shown on control system schematic use the same name c Instrumentation list Bill of Materials for each controlled system List each control system element in a table d Complete description of control system operation including sequences of operation Include and reference schematic diagram of controlled system List I O points and software points specified in Section 23 09 93 Indicate alarmed and trended points B Schedules 1 Adhere to the overall schedule of work Cooperate in the development of schedules to meet the owners substantial and final occupancy dates C Project Record Documents Submit three copies of record as built documents upon completion of installation for approval prior to final completion Submittal shall consist of standard APS Control As built packages 1 11 Warranty A Warrant work as follows 1 Warrant lab
149. s electrical interlocks Standard features include both manual and automatic operation internal power and control wiring selector switches control transformer and status indicating lights The electrical enclosure shall be a NEMA 3R steel cabinet with an ANSI 61 gray coating and include a HMCP and a disconnect switch with a lockable external operating handle The control power transformer shall step down primary voltage to 120 1 60 and include two fuses on primary side single fusing on secondary side The cabinet shall incorporate status indicating lights for POWER ON INVERTER BYPASS and HEATER ON The control panel shall include a factory mounted and wired pulse width modulating variable frequency drive VFD utilizing IGBT and microprocessor technology The VFD shall be sized for the cooling tower fan motor horsepower and include a three contactor bypass circuit Mode shall be selectable via an Inverter Off Bypass selector switch A thermostatically controlled heater shall be provided to inhibit condensation inside the control panel A thermostatically controlled cooling fan shall be provided to draw air across the VFD and provide cabinet air circulation The control panel shall include a terminal strip to interface with the cooling tower basin heater control devices the vibration cutout switch the electric water level controller and the ALC Automatic Logic Control system A terminal strip for the 120 volt control circuit sh
150. sections with couplings and according to code Make terminations in boxes with fittings Make terminations not in boxes with bushings 3 8 Communication Wiring A B Communication wiring shall be low voltage Class 2 wiring and shall comply with Article 3 7 Wiring Install communication wiring in separate raceways and enclosures from other Class 2 wiring 3 10 Installation of Sensors oU m Install sensors according to manufacturer s recommendations Mount sensors rigidly and adequately for operating environment Install room temperature sensors on concealed junction boxes properly supported by wall framing Air seal wires attached to sensors in their raceways or in the wall to prevent sensor readings from being affected by air transmitted from other areas Use averaging sensors in mixing plenums and hot and cold decks Install averaging sensors in a serpentine manner vertically across duct Support each bend with a capillary clip Install mixing plenum low limit sensors in a serpentine manner horizontally across duct Support each bend with a capillary clip Provide 3 m 1 ft of sensing element for each 1 m 1 2 of coil area Install pipe mounted temperature sensors in wells Install liquid temperature sensors with heat conducting fluid in thermal wells Install outdoor air temperature sensors on north wall at designated location with sun shield Differential Air Static Pressure 1 Supply Duct
151. self cleaning of the variable inlet ports over the full control range Valve bodies shall be rated for use at not less than 150 of system designed operating pressures Certified performance data for the flow control valve based on independent laboratory tests shall be available All flow control valves shall be supplied by in line strainer valves in a one piece configuration consisting of a union strainer blow down pressure temperature plug and ball furnished Correct flow shall be verified by establishing that the operating pressure differential across the valve tappings is within number The pressure measuring apparatus shall be portable and consist of a pressure gauge with a 4 1 2 diameter dial instruction hoses and connections and a pushbutton 3 way valve which transmits either of two pressures to a pressure gauge and a carrying case Temperature monitoring is to be by insertion of a thermometer into the fluid media T Pressure dependent Actuated Control Valves and Cartridge Belimo 1 The modulating control valves shall be pressure independent 2 The pressure independent modulating control valve shall include a Pressure Compensating Cartridge Actuated Ball Valve and Manual Isolation Ball in a single valve housing 3 Valve housing shall consist of forged brass rated at no less than 360 psi at 250 F 4 Valve shall have a fixed end or union end connection with factory installed air vent to allow for venting of the coil or heat pu
152. sible locations such as return air plenums shall be UL listed for the intended application Install wiring in raceway where subject to mechanical damage and at levels below 3 m 10ft in mechanical electrical or service rooms F Install Class 1 and Class 2 wiring in separate raceways Boxes and panels containing high voltage wiring and equipment shall not be used for low voltage wiring except for the purpose of interfacing the two through relays and transformers o m Automated Logic Virginia 23 09 23 13 APS Tavlor Renovation DIRECT DIGITAL CONTROL Section 23 09 23 SYSTEM FOR HVAC Date 11 11 2011 Size raceway and select wire size and type in accordance with manufacturer s recommendations and NEC requirements Conceal raceways except within mechanical electrical or service rooms Maintain minimum clearance of 15 cm 6 in between raceway and high temperature equipment such as steam pipes or flues Adhere to requirements in Division 26 where raceway crosses building expansion joints Flexible metal raceways and liquid tight flexible metal raceways shall not exceed 1 m 3 ft in length and shall be supported at each end Do not use flexible metal raceway less than 72 in electrical trade size Use liquid tight flexible metal raceways in areas exposed to moisture including chiller and boiler rooms Install raceway rigidly support adequately ream at both ends and leave clean and free of obstructions Join raceway
153. siness in Virginia by the SCC and such bidder s identification number issued to it by the SCC is 3 Bidder does not have and identification issued to it by the SCC and such bidder is not required to be authorized to transact business in Virginia by the SCC for the 00420 7 TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 16 following reason s Please attach additional sheets if you need to explain in further detail why such bidder is not required to be authorized to transact business in Virginia LIST OF SUBCONTRACTORS The Bidder submits the following names of Subcontractors to be used in performing the Work for Invitation to Bid with which this form is submitted The Bidder is responsible for listing any Subcontractors not identified below The Bidder certifies that all Subcontractors listed are eligible to perform the Work and that all Subcontractors performing more than five percent of the Work are listed Subcontractor s Work Subcontractors Name Acoustic Ceilings Mechanical Electrical This form should be submitted with the Bid END OF SECTION 00420 BID FORM 00420 8 TAVLOR ELEMENTARV SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 SECTION 230010 GENERAL CONDITIONS MECHANICAL PART 1 GENERAL 1 01 DESCRIPTION AND SCOPE A B These specification is applicable to and a part of Division 23 Mechanical Specifications Division of the sp
154. sions of NFPA and ASME boiler code standards Provide and install supply water temperature sensor manual reset hi limit temperature pressure indicator gauges flow balancing valves transformer and all necessary control wiring and devices Coordinate with other work plumbing heating and gas piping as necessary to interface installation of boilers with other components of the system MULTIPLE CONDENSING BOILER HEATING PLANT 235216 3 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 E Flush and clean boilers upon completion of installation in accordance with manufacturer s instructions F Start up cast iron boilers in accordance with manufacturer s written procedures and demonstrate compliance with requirements G Provide PVC condensate drains to floor drain 3 2 VENT SYSTEM A The vent system will include breechings and stacks System will be all stainless steel dual wall and UL approved for installation with condensing type boiler or PVC B The chimney support shall be specifically designed for the chimney and shall be tested approved and listed by the Underwriters Laboratories This support shall be capable of supporting four times the combined weight of the chimney installation C Provide ventilated roof thimble rain cap flashing storm collar assembly and accessories to complete chimney system D Installation shall comply with
155. ssarv material equipment machinerv apparatus transportation and labor as required to complete the project indicated on this BID FORM The Bidder certifies that he has not combined conspired or agreed to intentionallv rig alter or otherwise manipulate or to cause to be rigged altered or otherwise manipulated this Bid for the purpose of allocating purchases or sales to or among persons raising or otherwise fixing the prices of the goods or services or excluding other persons from dealing with Arlington Public Schools Arlington Public Schools requires that a minimum of 30 davs after receipt of an approved Application for Pavment invoice be allowed for pavment The Bidder certifies that it will complv with all provisions of the Virginia Public Procurement Act and with the regulations of Arlington Public Schools Bv submitting a Bid the Bidder represents that the Bidder understands the Insurance Requirements of these specifications and will comply in full if awarded the contract In submitting this Bid Bidder represents as more fully set forth elsewhere in the Bid and Contract Documents a Owner has recommended the Bidder examine the site and locality where the Work is to be the legal requirements federal state and local laws ordinances rules and regulations and the conditions affecting cost progress of performance of the Work and has made such independent investigations as Bidder deems necessary BID FORM 00420 1 TA
156. st engineering practice Manufacturer s instructions and recommendations shall be followed and all auxiliary piping water seals valves electric connections etc shall be provided D All piping ducts and conduits shall be run parallel with the lines of the building except as otherwise indicated E Provide approved shields to prevent the contact of dissimilar metals The shield shall provide a separation so that the electrical current is below one percent of the current which would exist with metal to metal contact 3 02 EXCAVATION AND BACKFILL A Trenches for Piping underground and under floor slabs shall be excavated to a uniform grade Holes shall be provided for hub and spigot piping so that each length of pipe shall have a solid bearing for the full length of the barrel B Organic materials leaf mold debris mud and other unstable material shall be removed to a depth sufficient to allow the construction of a stable foundation All cuts below the required trench grade will be refilled with compacted sand or fine gravel to insure a stable base for the piping GENERAL CONDITIONS MECHANICAL 230010 5 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAVLOR ELEMENTARV SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 C Trenches shall be braced and sheathed Water shall be removed as necessary to protect workmen and adjacent structures No pipe or masonry shall be laid under water D After piping has been
157. t be included in conduit containing AC circuit wiring Design range shall be as required by system External zero and span adjustments over pressure to 2 000 PSI and no humidity effects Minimum accuracy shall be 0 25 of calibrated span Includes combined effects of linearity hysteresis and repeatability Stability shall be 0 25 of upper range limit for six months No internal mechanical linkages shall be used in the transmitter s HYDRONIC SPECIALTIES 230524 2 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 2 07 FLOW METERS Provide dual turbine insertion type flow meter s equal to a Onicon SF1210 Wiring installed by the contractor between the control system and the meters shall be Belden 9320 two wire shielded twisted cable and shall not be included in conduit containing AC circuit wiring The meter shall have two contra rotating axial turbines each with its own rotational sensing system and an averaging circuit to reduce measurement errors due to swirl in undeveloped flow locations caused by short straight pipe runs Rotational sensing of each turbine shall be accomplished electronically by sensing impedance change and not with magnetic or photoelectric means Paddle type rotors will not be acceptable The sensor shall have a maximum operating pressure of 400 PSI maximum operating temperature of 180 deg F optional 300 deg F peak
158. t is not equal to the specified equipment Approved by the Owner or Engineer does not modify the requirements of the Contract Documents Deviations from these requirements must be specifically requested and approval received in writing from the Owner or Engineer before such deviation will be permitted The Approval stamp does not constitute such written approval J Shop drawings or submittals stamped Approved as Corrected give authority to proceed in accordance with the notes However final shop drawings bearing all corrections noted shall be resubmitted prior to receipt of that item on the job site K Submit all adhesives sealants and welding solvents used on site for review and approval 2 04 ACCESS PANELS A Panels to be Higgins Products Co Milcor Steel Co Karp Assoc Inc Walsh Spencer Co Wilkinson Co or Zurn Industries Inc and shall be set in frames with counter sunk screws and shall have cylinder locks All locks shall have one master key PART 3 EXECUTION 3 01 GENERAL CONSTRUCTION REQUIREMENTS A Contractor shall base all measurements both horizontal and vertical from established bench marks All work shall agree with these established lines and levels B Make provisions for easy access to valves strainers panels motors drives dampers filters controls devices and similar items requiring inspection or maintenance C All appliances and equipment shall be installed and connected in accordance with the be
159. tem while flushing operation is being performed Do not connect the heat exchanger to the indoor piping system until the indoor system has been thoroughly cleaned and flushed Flow rates and pressure drops will be compared to calculated values to assure that there is not blockage or kinking of any pipe A minimum velocity of 2 ft sec in each piping section must be maintained for a minimum of 15 minutes to remove all air A change of more than one inch in the level of fluid in the purge pump tank during pressurization indicates air still trapped in the system C Balancing Balance pipe loop flow to quantities indicated on drawings 3 8 SYSTEM IDENTIFICAITON AND INSTRUCTION TO WONERS PERSONNEL A Submit a shop drawing showing the dimensioned layout of the new installation 3 9 HIGH DENSITY POLYEHYLENE PIPE TESTING PROCEDDURE A High Density Polyethylene HDPE pipe testing should be conducted as required by ASTM F 2164 02 Procedure The purpose of the test is to insure that the ground heat exchanger GHEX does not have leaks The test process is under the ASTM 2164 02 guidelines and is the industry standard The basics of the test are a Flush and purge all air from the piping to be tested b Close off by valves the piping to be tested c Slowly add water with a positive displacement pump to raise the system pressure to the maximum determined by the responsible parties The maximum pressure is 1 5 times the design working press
160. tested and approved the trenches shall be backfilled by compacting each lift by whatever means necessary to assure the following percentages of maximum dry density Underlying lifts 95 Top 12 inches 95 E Backfill shall be compacted mechanically in layers not exceeding 6 inches deep Backfill shall be placed and sheathing removed in such a manner that pipes will not be disturbed F The Contractor shall provide barricades around all open trenches G The Contractor shall confirm to invert grades shown on the drawings and shall verifv the location of mains as indicated before trench excavation is started 3 08 UTILITY CONNECTIONS A Ascertain from the utility department or utility company the exact amount of work required in connection of utilities Work required which is not provided by the utility department or company shall be provided by the Contractor unless indicated otherwise Verify the location and depth of all utilities and call to the attention of the Owner any discrepancies which involve additional work before signing of the contract After the contract is signed any additional work required for the complete and working job shall be provided at no additional cost to the Owner unless indicated otherwise Locations depths sizes capacities etc of utility lines shall be verified by the Contractor prior to doing any other work on piping systems which are to connect to such utility lines Any work rendered unusable
161. testing Air to Refrigerant Coil The air to refrigerant coil shall contain copper tuber mechanically expanded into evenly spaced aluminum fins All coils are to be leak tested The proof must be performed at 450 psi operating pressure and the leak test at 125 psi operating pressure with helium The refrigerant coil distributor assembly shall be of orifice style with round copper distributor tubes The tubes shall be sized consistently with the capacity of the coil Suction headers shall be fabricated from rounded copper pipe Motor and Fan Assembly 1 All fan motors shall be ECM The motor shall have permanently lubricated and sealed bearings All motors shall have internal thermal overload protection 2 The fan assembly shall be arranged for front discharge or left discharge The discharge must also be capable of being changed from front to left or left to front in the field 3 Removal of the motor and fan wheel shall be made with the assistance of a factory provided orifice ring device This device shall attach the wheel and motor to the fan housing in one assembly providing single side service access Filters Filters shall be 2 inch 40 efficient MERV 8 rated filters Two sets total of filters shall be provided to the job Thermostats ATC contractor shall provide and install zone sensor with one setpoint and override button See detail on mechanical drawing for coil hook up detail Condensate hose shall extend to the exterior
162. the terms of the UL listing manufacturer s instructions and local building code 3 3 FIELD SERVICES A Contractor shall provide the services of a local factory authorized representative to supervise all phases of equipment start up A letter of compliance with all factory recommendations and installation instructions shall be submitted to the engineer with operation and maintenance instructions END OF SECTION MULTIPLE CONDENSING BOILER HEATING PLANT 235216 4 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 SECTION 236500 COOLING TOWER CROSS FLOW DESIGN PART 1 GENERAL 1 1 DESCRIPTION A Manufacturer shall provide cooling tower in accordance with the drawings schedules and specifications The extent of work is indicated by drawings and schedules and by requirements of this section Each unit is defined to include but not by way of limitation casing fans drives motors sump and controls and auxiliary components accessories and interconnecting piping Mechanical contractor shall receive and install one factory assembled induced draft crossflow cooling tower with vertical air discharge conforming in all aspects to the specifications schedules and as shown on the plans Overall dimensions shall not exceed approximately 12 ft long x 9 ft wide x 11 ft high The total connected fan horsepower shall not exceed 7 1 2 HP The c
163. uct Data Manufacturers catalog sheets specifications and installation instructions for each item specified 1 For piping including manufacturer s name schedule type or class of pipe and fittings and where optional materials are specified in the Pipe and Fitting schedule indicate the option selected C Quality Control Submittals 1 Geothermal System Installers Qualifications Data a Name of each person who will be performing the geothermal work and their employers name and business address b Names and addresses of 3 similar projects that each person has worked on C Copy of installers personal accreditation as a GEOTHERMAL INSTALLER from IGSHPA 2 Geothermal System Supervisors Qualifications Data a Name of person overseeing the geothermal work and their name and business address b Name and address of 3 similar projects that the supervisor has overseen during the past 5 years C Copy of installers personal accreditation as a GEOTHERMAL INSTALLER from IGSHPA 3 Geothermal System Contractor s Qualifications Data a Names and addresses of 3 geothermal projects of similar size and complexity that the Supplier has worked on during the past 5 years D Contract Closeout Submittals Warranty Copy of specified warranty 1 3 QUALITY ASSURANCE GEOTHERMAL SYSTEM 2011 SHW GROUP 232113 33 1 ARCHITECTS ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00
164. ure less the elevation hydrostatic head An example if the static water level in a vertical geothermal heat exchanger is one hundred feet below the surface one must reduce the testing pressures to not over pressure the vertical piping If the loops are 300 feet in depth the them maximum pressure for SDR 11 PE testing is 1 5 times the design 1 5 x 160 240 psig less 100 feet of dry borehole or 100 x 4335 43 35 psi reduction therefore it is 240 minus 43 35 or 196 65 psig maximum testing pressure Typical design pressures for SDR 9 is 200 psi for SDR 11 is 160 psi and SDR 13 5 is 128 psi and are to be reduced for higher temperatures GEOTHERMAL SYSTEM 232113 33 7 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAYLOR ELEMENTARY SCHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 Typically the design temperature for HDPE is 73 4 F Usually it is the horizontal sections of the GHEX that are above this temperature Consult the HDPE manufacturer for the temperature reductions for pressure ratings a Allow the test section of piping and test liquid to equalize in temperature b Add make up water as necessary for four 4 hours to maintain test pressure c Reduce pressure by ten 10 psi by letting water out and then closing the system d Monitor for one 1 hour do not increase pressure or add water e Pass Fail Criteria if no leakage is visually observed and the pressure remains steady with
165. utomatic reset include fan and filter status and low water temperature 5 The unit controller shall receive the following commands from the BAS mode occupied and unoccupied demand limiting sequence emergency shutdown time of day scheduling soft lockout from loss of water flow and high or low water temperature E A scroll compressor shall be provided externally isolated with internal thermal overload protected motors All refrigerant lines shall be fully insulated HEAT PUMP SYSTEM CLOSED CIRCUIT TYPE GEOTHERMAL SYSTEM 238146 2 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAVLOR ELEMENTARV SGHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 F Water to Refrigerant Heat Exchanger The water to refrigerant heat exchanger shall be of a high quality co axial coil for maximum heat transfer The cupro nickel coil shall be deeply fluted to enhance heat transfer and minimize fouling and scaling The coil shall have a working pressure of 450 psig on both the refrigerant and water sides The factorv shall provide rubber isolation to the heat exchanging device to enhance sound attenuation Refrigerant Metering The equipment shall be provided with a TXV terminal expansion valve to allow operation of the unit with entering fluid temperature from 25F to 125F Shrader Connections The refrigerant access ports shall be factory supplied on the high and low pressure sides for easy refrigerant pressure or temperature
166. vaporation of condensate provide room for coil cleaning and allow control system to monitor evaporator coil leaving air temperature 2 Hot gas reheat coil shall be constructed entirely of aluminum 3 Hot gas reheat shall be controlled through a factory supplied modulating control valve 8 6 Compressors 1 Compressors shall be hermetic scroll type and include the following items Short cycling control High and low pressure limits Crankcase heaters 2 Compressors shall be installed in an isolated compartment separate from supply airflow return airflow microprocessor controller non fused disconnect compressor relays fan motor VFD and all other electrical components inside the unit 3 Compressors shall be installed using manufacturer s recommended rubber vibration isolators 4 Lead refrigeration circuit shall utilize Digital Scroll compressor capable of 10 1 turndown 8 7 Water to refrigerant heat exchanger 1 Each independent refrigerant circuit shall be provided with a coaxial water to refrigerant heat exchanger 2 Each independent water to refrigerant heat exchanger shall be equipped with a factory supplied and mounted two way three way valve with modulating actuator 1 1 Suction and discharge service valves 1 2 Reverse rotation protection 1 3 Oil level adjustment 1 4 Oil filter 1 5 Rotary dirt trap 1 6 1 7 1 8 9 ELECTRICAL 9 1 Units shall be factory wired with a single point power con
167. vided Submit product data on filtration media used during construction and installed prior to occupancy 1 03 EQUIPMENT WARRANTY A two year parts warranty shall be provided for any part of the heat pump which becomes defective in normal operation with an additional parts only warranty of five years covering replacement of the HEAT PUMP SYSTEM CLOSED CIRCUIT TYPE GEOTHERMAL SYSTEM 238146 1 2011 SHW GROUP ARCHITECTS ENGINEERS PLANNERS TAVLOR ELEMENTARV SGHOOL ADDENDUM 2 NOVEMBER 11 2011 HVAC RENOVATION 3111 003 00 compressor Warranty shall commence when the system is totally operable and has been checked and approved by the Engineer A two year labor warranty shall be provided by the mechanical contractor PART 2 PRODUCTS 2 01 HIGH EFFICIENCY GROUND SOURCE HORIZONTAL AND VERTICAL WATER SOURCE HEAT PUMPS A Manufactured Units Provide Water Source Heat Pump WSHP factory assembled and pre wired consisting of galvanized steel cabinet with 1 inch fiberglass on interior front duct discharge collar and back return collar with hinged access filter rack to accommodate 2 thick 40 efficient pleated media filters rated at MERV 8 micro electronic unit control processor for high and low refrigerant pressure safety control scroll compressor water to refrigerant coil thermostatic expansion valve refrigerant access ports air to air refrigerant coil and motor and fan assembly B Provide four 4 rigid hanging brackets
168. ware Points Software Points Point Name Al AO BI BO AV BV Sched Trend Alarm Show On Graphic Water Flow Rate x Demand Peak Today Peak Month to Date Peak Year to Date Usage Today Usage Month to Date Usage Year to Date Meter Failure Totals 1 0 Total Hardware 1 Total Software 8 x ka e Automated Logic Virginia 23 09 93 B 20 1 10 Outside Air Conditions tvpical of 1 Outside Air Conditions The controller shall monitor the outside air temperature and humidity and calculate the outside air enthalpy on a continual basis These values shall be made available to the system at all times Alarm shall be generated as follows e Sensor Failure Sensor reading indicates shorted or disconnected sensor In the event of a sensor failure an alternate outside air conditions sensor shall be made available to the system without interruption in sensor readings If an OA Temp Sensor cannot be read a default value of 65 F will be used If an OA Humidity Sensor cannot be read a default value of 50 will be used Outside Air Temperature History The controller shall monitor and record the high and low temperature readings for the outside air These readings shall be recorded on a daily month to date and year to date basis Hardware Points Software Points Point Name Outside Air Temp Outside Air Humidity Outside Air Enthalpy High Temp Today High Temp Month to Dat High Tem
169. wer typical of 1 Central Plant The central plant acts as supplementary heating and cooling to the well fields The boilers and cooling tower shall operate in a mutually exclusive fashion Central plant pumps shall run in a lead lag fashion as required to supply supplemental heating or cooling to the main building heat pump loop BOILER SECTION Boiler System Run Conditions The boiler system shall be enabled to run whenever e definable number of hot water coils need heating e AND outside air temperature is less than 65 F adj e AND the well field supply temperature is insufficient to meet the heating load in the building The boilers shall be enabled by the BAS and shall have the setpoint reset to meet the building heating load The remainder of boiler controls shall be by the boiler control system The boiler shall run subject to its own internal safeties and controls Boiler 1 Safeties The following safeties shall be monitored e Boiler alarm e Low water level Alarms shall be provided as follows e Boiler alarm e Low water level alarm Boiler 2 Safeties The following safeties shall be monitored e Boiler alarm e Low water level Alarms shall be provided as follows e Boiler alarm e Low water level alarm Circulation Pumps The Circulation Pumps shall run anytime the associated boiler is called to run and shall have Automated Logic Virginia 23 09 93 B 6 a user definable delay adj on

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