ISSB-1 SERVICE MANUAL August 2011
Contents
1. YO4 IHLLNI IHL ONNOYV A lddV 901 dN HOLVW SNOILOSS LINA SJIVAANS OL AlddV 0 0 404 2 49 OL 5 335 SNOIL94S 318A3SSV OL G3YINOAY STANNVHO GITIVISNI MU al lt 2 COOH 3XVLNI b 21 JUNSOTONA 0 0 00 NOILOAS H4MO 18 INTI SOM 3NIGf 1 TONI LINN 076 685 466 485 WOldAL ON SNOILdO GIOHINVW HLIM AHVA TIM SLNIOd NOISN3dS S JILON NOILOJS 01 NOILOAS HINHNA SINIOd ANY 59071 NII alc M1 WHOSLV Id 39IAM3S INION IINI LINA HOOANI HONOYHL 211 1 814 95 11 85 IVDIHAL 222. 3 0 AG 31 55030 10 AG LIMSVI 3 40 3 3 NO G3TIVLSNI 38 OL 13XSV9 8 1 lt HONOYHL lt ANY 86 HINOYHL ZIL 083 810 856 H9 OMHL 211 95 404 8409 4004 vl ON 3380913 JIN T 6161 12 OG 66 5 0 0 0 3 5 4004 3 10 NOILVfSNI SM3HLO A8 1 5 LNVO 0 AMO12V 3 GALNNOWNN 3 10 NIHSY14 0 9 13MSV9 I 1 0 IVNOILdO IVNOILdO SM3HLO A8 0 3 3 1509915 XNV8 A 03 SI 9 00 4 SM3HLO SYSHLO GAGIAOYd 1375 9 GSTIVLSNI 03119915 INIHSV 13 a NJ 3M3LN39 SM3HLO TINNVHO LINN IVIIW 133HS 3
3. I 2 imped 3 333 3333 1 11 9 Valve ACJUSIMONIS sins a 0 of Operations bet 1 K Installation of Roof Curbs eee e ee TK SECTION 3 Trouble Shooting L Trouble Shooting the Direct Gas Fired Trouble Shooting the Electric nh N Trouble Shooting the Steam or Hot Water SECTION 4 Illustrations Unit Assembly Figure Torere 3 3 11 1 2 3 3 3 3 317 1 1 1 1 0 Unit S spension Figure S ua e 0 2626 0 Unit Assembly and Suspension Figure 5 6 Unit Assembly and Suspension Figure 6 4 2 10 TK Duct Connections Figure 7 1 86 2 60 TK h KH Ki K Ki kh Ki Remote Control Panel Figure 8 TS SH T
4. 0 13NI8V2 9NIHSV14 TANVd 3015 LINN 33 138 INIMINVD HASTINGS GL HVAC EEE 3606 Yost Avenue Hastings Nebraska 68901 1966 Phone 402 463 9821 Fax 402 462 8006 www hastingshvac com E mail sales hastingshvac com
5. is set to 1 0 w c Units equipped with filter sections will have a clogged filter or blocked intake light in remote control panel If filter light is on and blower light is off check for a Dirty filters b Blocked intake If blower starts and remote control panel blower light comes on operates for a short time and then stops check a Starter reset and possible motor overloading b To see if unit equipped with low outlet temperature shut off with cold start time delay 1 Low limit control setpoint too high 2 Over riding timer completing its cycle before burner operates 3 Burner fails to operate If blower operates and blower signal light is on but burner fails to operate check to see if Season switch in remote control panel is in winter position Auxiliary starter contact in magnetic motor starter closed Programming relay in safety lockout Intake air temperature controller set point above outdoor ambient temperature Ignition transformer functioning properly o Air proving switch is open due to under or over velocity See Item 2b note Spark gap is approximately 3 8 gt Flame rod wire and spark ignition wire for loose connections and or reversed wires Any electrode insulators are cracked replace as required j Pilot gas valve is open and that pilot has been lit purge pilot gas line to eliminate any air A three to four micro amp reading for pilot is being attained
6. winter position Air proving switch is closed check to see if 1 Discharge is blocked 2 Belt s are loose and slipping 3 Blower is running backwards 4 Sensing tube is blocked or crimped Heating relay coil is energized and contacts closed Standard modulating step controller has power check to see if 1 Step controller power transformer fuses are in electrical circuit 2 Power transformer supplying 115 volts 3 Automatic reset thermal cutout is closed Step controller is functioning Any or all sub circuiting heating element fuses in circuit Magnetic heating element contractor coils are energized and contacts are closed Thermally operated heat limiters are in power legs to heating elements 17 If unit does not heat air check to see if a Modulating step controller is operating through all heating steps b Sub circuit heating element fuses in circuit c Allmagnetic heating element contactors are operational d Heat limiters and in the electrical circuit NOTE Electric heating SBE units may not be furnished with a disconnect switch or circuit breaker If service work is to be required opening more than one disconnect switch may be required to com pletely de energize system Make no attempt to re wire any heating element circuits if a failure occurs Con tact home office N TROUBLE SHOOTING THE STEAM OR HOT WATER SB UNIT 1 If blower fails to operate check to see
7. Main gas valve s open If unit does not heat air check to see if a Modulating valve is functioning properly b All gas cocks are in full open position c Inlet pressure to unit agrees with unit specification plate d Gas pressure at burner is 4 1 2 W C If not adjust main gas pressure regulators on unit until there is 4 1 2 W C at burner If unit is designed for reduced manifold pressure correct pressure to agree with that shown on unit specification plate If burner ignites but modulating valve fails to open check to see if a Temperature selector dial is set at proper temperature range b Motor and controller are wired properly c Setting of discharge temperature selector dial or modulating room thermostat If unit is equipped with motorized pre mix burner and burner does not operate check to see if a Burner relay or starter coil energized b Burner starter if required needs resetting c Differential burner proving switch closing blower must run for switch to close 16 9 1 If burner flame is not consistent across the entire burner length and darker areas are noticed burner orifice openings are blocked and require cleaning contact factory for orifice drill size TROUBLE SHOOTING THE ELECTRIC SB UNIT If blower fails to operate check to see if a b 0 Optional main disconnect switch or circuit breaker closed All main fuses if disconnect switch used are in
8. SECTION 2 E INSTALLATION PROCEDURE The following recommendations not intended to supplant any requirements of federal state or local codes having jurisdiction This equipment shall be installed and wired in accordance with regulations of the National board of Fire Underwriters National Electric Code and local governing bodies In Canada equipment should be installed in accordance with the applicable provincial regulations 1 Handling the Equipment The units have been designed for rigging and handling through the units channel base frame and or special lifting lug hooks installed on the unit All lifting operations must be accomplished with a load spreader of sufficient width to insure that the lifting cables clear the side of the unit If this type of spreader is not available wood strips should be inserted between the cables and unit where necessary See Figure No 1 and No 2 in this manual Units are suspended from same lifting lugs as used for handling See Figure No 3 and Figure No 4 To be properly set the unit should be placed on a solid flat and level foundation and set exactly as detailed later in the installation guide During the transit unloading and setting of the unit bolts and nuts may have become loosened particularly in the pillow block ball bearing assemblies on blower section It is recommended that all nuts and set screws be tight ened Turn blower fan shaft by hand to make certain that no rubbing occur
9. rises above 65 F If unit is to be test run when outside temperature is above 65 F this setting will have to be raised for burner to operate After unit has been test run reset controller at 65 F Close gas hand valves and pilot cock Set all switches to Off position 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Wait five minutes Push reset button on electronic relay Push manual reset button on gas pressure switches starters and limit control if necessary Check if limit control is locked at 180 deg F discharge temperature Close main disconnect switch to turn power on Standard units are operated from the toggle switches in the remote control panel If it is necessary to check blower motor rotation from the unit jumper the respective electrical terminals at the unit as shown on the electrical wiring diagrams Move blower switch to on position White signal light marked blower should indicate that the blower is operating If blower runs but light does not come on blower may be running in reverse direction All applicable safety controls are in series with blower motor starter coil and must be in the electrical circuit for proper unit operation see appro priate electrical wiring schematic All three phase motors were properly phased during factory testing If rotation is reversed interrupt main power supply and interchange any two of the incoming power leads Re e
10. 165 3 25 Ibs K INSTALLATION OF ROOF CURBS Units can be supplied with an optional roof curb The curb greatly facilitates installation thereby reducing installation costs All connections to the unit ductwork piping and electrical power and control wiring can be made through the roof opening The curb may be shipped prior to unit shipment or may accompany the unit to the jobsite All roof curbs are shipped knocked down from factory The curb is 3 1 2 thick and includes a 2 high wood nailer strip curb adaptor and seal ing tape Curb is made from 18 gauge galvanized steel Curb does not include insulation or cant strip may be re quired to adapt to all types of roofing including gypsum See Figure No 13 and Figure No 14 Use extreme caution in handling the curb Proper handling and positioning will insure a water tight curb unit installa tion Re check approval prints prior to installation Be sure that there are no obstructions to ducting and that proper plan ning has been exercised in connection of piping and or electrical services The curb assembly must be supported by roof trusses at intervals no greater than eight feet It may be bolted or welded to either trusses or roof decking however connection to roof trusses is recommended The curb is designed to carry the weight of the unit Additional support is required for certain applications Placement of the curb is critical in squareness and leveling Shims for le
11. discharge arrangement must have discharge ductwork supported from building support members and not supported from the equipment NO DISCHARGE DUCTWORK IS TO BE SUPPORTED BY EQUIPMENT DISCHARGE OPENING CONNECTIONS Connect discharge air duct or discharge grill to unit outlet If unit is installed outdoors be sure that duct opening to building is adequately flashed and sealed to prevent leakage All air to the heater must be ducted directly from the outdoors Recirculation of room air is not permitted Adequate instructions shall be provided to address heater installations where a duct work system is attached to the inlet of the heater to purge the volume of the duct system with at least four air changes prior to an ignition attempt If in doubt regarding the application consult the heater manufacturer 7 Remote Control Panel a Standard remote control panel This panel is furnished with two heavy duty toggle switches and three 115 volt signal lights The switches control the blower blower switch and the burner Season switch The signal lights indicate supply blower operation white light marked blower burner operation amber light marked heating and safety lockout red light marked lockout See typical remote control panel illustrated in Figure No 8 in this manual b Optional remote control panel s Same as described above but with the addition of lights and switches de pending upon options ordered 8 Remote Control Panel Specificat
12. flame or flame simulating conditions occurs if there is a failure to ignite main flame or on a loss of flame while burner is running The alarm lockout terminals will energize the safety lock out relay which will open the lockout relay contacts and shut down the blower and burner Safety lockout light in remote control panel will be operational Burner flame is controlled by the modulating valve and discharge air controller Flame is increased and decreased as discharge temperature rises and falls above and below setpoint of discharge air controller Typical sequence of operation electric units Closing optional main disconnect switch supplies 115 volt power to control circuit through 115 volt control transformer Unit is ready for operation Summer Operation If three position season switch is in the summer position and the three position blower switch is in the on posi tion power is supplied to the blower motor starter Blower relay and blower delay timer must be operational Blower motor will run if blower motor overloads are not tripped Heater is inoperative System white light in remote control panel will be on if auxiliary blower motor starter contacts are closed Optional clogged filter light in remote control panel will be operational if a blocked intake or clogged filter situation occurs Winter Operation If three position season switch is in the winter position heating control relay is operational and air fl
13. left open for continuous venting Vent air lines should not be re turned to the condensate return main 10 If condensate must be lifted above coil return level into overhead mains or if return mains are pressurized a pump and receiver should be installed between condensate traps and return mains Most of the common causes of trouble have been covered and one or more remedies suggested to correct the malfunc tion but if SB unit still fails to operate properly notify the nearest Hastings service representative 19 0 IHL ONNOYV A lddY 43 1 3901 dN HILVW SNOIL 3S LINA 4HAHM S429VAHANS 1VI1 OL AlddV wa 3 1051 P lt V 5 gt gt PAR NOILOJS kuwa M3 AO 18 NJ 334250 8 GOOH JMVINI 20 AlddV 3 NOILONYLSNOO S NI 5 ONICGNIONI 13 0 V NI 8 H9 nOMHL 821 093 H9 OMHL 11 0893 ATEWASSV LINN 816 485 HONOYHL lt 4 INVI ON
14. line Control transformer is supplying 115 volts to control circuit Blower switch in remote control panel is on if unit used for make up air or in the on or auto position if unit is being used for space heating or heating ventilating NOTE If blower switch is in auto position blower will operate for approximately 90 seconds after switch is turned off Blower start relay coil energized and contact closed Fan delay timer heating element energized and contacts closed Magnetic motor starter is in circuit manual reset starter There are any loose wires or connections in blower circuit at either terminal block or control components Also check the following optional controls if used to see if a b 0 Damper motor and end switch is closed damper motor must be full open Low limit temperature control setting too high or n c over riding timer contacts open Access door switch es open NOTE If other optional controls are supplied on special applications check to see if they are in the electrical circuit 2 If blower runs but remote control panel blower light doesn t come on auxiliary starter contact in magnetic motor starter not closing Units equipped with filter sections will have a clogged filter or blocked intake light in remote control panel If blower operates but electric heater fails to operate check to see if a b e Season switch in remote control panel is in
15. of parts and accessories The purpose of this manual is to supplement but not to replace the services of qualified field service personnel to supervise the initial start up and adjustment of the SB unit Per sons without previous experience with large commercial and industrial make up air equipment should not at tempt the initial adjustment and check out procedure essential before such installations be considered as ready for operation C EQUIPMENT SERVICING AND SHIPPING INFORMATION 1 Periodic Service Periodic service on any piece of mechanical equipment is necessary for efficient operation Hastings has a na tionwide service organization available to make quick and dependable servicing of make up air return air heat ing ventilation or air handling type equipment Representatives of this service organization are trained at the factory by qualified engineering and service per sonnel In addition the company has trained service engineers who are always available for consultation on any service problems in the field 2 Factory Start Up Service This service includes the presence of a factory service engineer to perform the initial start up and adjustment of the equipment instruction of the owner s maintenance personnel in proper operation and maintenance and re turn calls for any adjustments required to a particular unit excluding any parts failures within a period of ninety 90 days after start up is complete Customer s loss
16. position 10 H VALVE ADJUSTMENTS MR 212 Valve High Fire Manifold Adjustments 1 Disconnect wires from amplifier terminal 4 This causes the valve to call for continuous high fire 2 Remove seal cal a and turn regulator pressure adjusting screw to obtain desired mainfold pressure Clockwise rotation increases pressure 3 Reconnect hte wires to amplifier terminal 4 M411 511 611 VALVE High Fire Manifold Adjustments Disconnect wires from amplifier terminal 4 this causes the valve to call for continuous high fire Adjust the pressure regulator to obtain the desired manifold pressure 7 w c maximum Reconnect the wires to amplifier terminal 4 NOTE If low fire bypass is Low Fire ro Bypass maximum the desired high fire outlet Adjustments pressure may not be achieved Low Fire or Bypass Adjustments Disconnect wire from amplifier terminal 8 this causes valve to call for continuous low fire Remove cap B and loosen lock screw C Turn D to desired low fire adjustment Clockwise rotation reduces minimum flow rate Tighten set screw C replace cap B and reconnect wire to amplifier termnial 8 MR 212 VALVE 1 Disconnect wire from amplifier terminal 8 this causes the valve to call for continuous low fire Remove cap A and turn adjusting screw B to desired low fire adjustment Clockwise rotation reduces minimum flow rate Replace ca
17. 155 1 August 2011 EE HVAC EEE Installation and Service Instructions DIRECT GAS FIRED ELECTRIC STEAM AND HOT WATER NOTICE Read These Instructions before installation Project Location Installer Phone No Date Installed FOR YOUR SAFETY If you smell gas Open windows 2 Don t touch electrical switches 3 Extinguish any open flame 4 Immediately call your gas supplier WARNING Improper installation adjustment alteration service or maintenance can cause property damage injury or death Read the installation operating and maintenance instructions thoroughly be fore installing or servicing this equipment FOR YOUR SAFETY The use and storage of gasoline or other flammable vapors and liq uids in open containers in the vicinity of this appliance is hazardous TABLE OF CONTENTS SECTION 1 General Information A B Installation and Service InstructionsS Notice to Equipment 0 21 21 1 1 1 40 66 000 Ki Ki 0 Equipment Servicing and D Specifications lt 2 i 2 3 0 SECTION 2 Installation Installation Proce edUr s c Q00 00002 1 P 6 StdFtIHSDGGLIOH 2726445310502 dati 5
18. 4 TANNVHO 25 8 NOILOSS 0 14 8164 01 HONOYHL 1 11 ANY 85 HINOYHL lt 0 NOILVTIVISNI LINA IVOILM3A TVOIHAL 29 LAN 11 8 6 LL ON AIEWSSSV YSNYOO 1 8 6 T L L LL 8 ole Hi 9 8446 65 3 IBN3d3SSV ONIL JAVd3 LINN IVOIGAL 30 Sais A 1 LAN LL 8 S eae Oe 52 0 8 5 1108 OVIH Z L L Il 8 6 455 109 E pss LINO e D se CA 03 LON dIMLS LNV2 03 LON 1734 00 03 3 LON 0 03 3 M3LdvdY 3HSINMn 4 QOOM 0 sr HZ 3809134 1 JI8A3SSV OL Gyno
19. IGURE NO 8 TYPICAL REMOTE CONTROL PANEL REMOTE CONTROL PANEL DEPTH 3 1 2 LID 15 16 GA BRUSHED STAINLESS STEEL ALL LETTERS ARE SILKSCREENED BLACK NOTE FILTER LIGHT MAY NOT BE REQUIRED ON ALL APPLICATIONS 27 TYPICAL REMOTE CONTROL PANEL INSTALLATION STUD OR PROVIDE MOUNTING HOLES amp CONDUIT HOLE S AS FIELD CONDITIONS REQUIRE TYPICAL INSTALLATION IN WEB OF BLDG COL CONDUIT OR FLEX NOT BY UNIT MANUFACTURER TO MAIN CONTROL PANEL CONTROL PANEL CUT IN WALL FOR WIRING BOX WALL PLATE USE ONLY WHEN WIRING BOX IS TO BE RECESS MOUNTED WALL PLATE OPTIONAL SUPPLIED ON REQUEST FIGURE NO 9 28 LHOIL 43LVM 404 43L3WI43d 4HILNA ONNOHV M31HI39OL dA HOLVW SNOIL94S LINA SYSHM S49V4HNS 1914 OL ONMINVD 9 9 9 Ove 8 LS 8 15 9 62 002 y y 9812 20 2 V S3HONI NI 3215 OL ON 41 OZ NIW 8 N332SdaIg8 CNIW NOILOSS NOILOSS AMTEWASSVY 01315 YO 1 1 oyz z1l TINNVHO 401 812 21 STANNVHO MO 2 222 JWVH
20. S KT Ki Ki uy KH Remote Control Panel Installation Figure 9 Unit Figure 10 tics sete RR tu 31 0 Vertical Unit Base Frame Figure Th 28 Vertical Unit Base Frame 2 3 ee 23 3 3 rr Root Curbs FIgUrI 92 U u La Roof Curbs Figure 14 VE ek N N N A SECTION 1 General Information A INSTALLATION AND SERVICE INSTRUCTIONS The purpose of the following instruction is to present a guide for proper installation and operation of said equip ment and to act as a supplement to the services of a qualified field service engineer at initial start up of a Hast ings piece of equipment We recommend that this manual be readily available to operating personnel for refer ence as an aid for trouble diagnosis and proper maintenance Information for installation of the heater 1 in airplane hangars in accordance with the Standard for Aircraft Hangers ANSI NFPA 409 and 2 public garages in accordance with the standard for Parking Structures ANSI NFPA 88A or the Standard for Repair Garages ANSI NFPA 88B and with CAN CGA B149 Installation Codes The installation shall conform with local codes or in the absence of local codes in accordance with the National Fuel Gas Code AN
21. SI Z223 1 or the CAN CGA B149 Installation Codes Instructions require that if the failure or malfunction of this heater creates a hazard to other fuel burning equip ment in the building e g when the heater is providing the make up air to a boiler room the unit is to be inter locked to open inlet air dampers or other such devices Authorities having jurisdiction should be consulted before installations are made Local codes may require addi tional safety controls and or interlocks B IMPORTANT NOTICE TO EQUIPMENT USERS Models SBD 112 through SBD 218 EBD 112 through EBD 128 and LU 112 through LU 218 are shipped with burner section and blower section assembled Intake hood and birdscreen filter section intake or discharge damper sections or other large accessories are assembled but shipped as individual items Models SBD 222 through SBD 240 are shipped as separate sections SBE SBDR SBS SBW and vertical units are shipped in the same manner as explained above All options and accessories are shipped mounted and wired whenever possible within the limitations of ship ping and handling Any accessories which include wiring that are shipped separate i e intake or discharge dampers require no additional conduit or wiring in the field All wire leads will be tagged for reconnection in the field The SB unit is designed to simplify field installation All parts have been designed in module form to facilitate field installation
22. and remove paper shipping block re install cover and adjust manual reset Refer to heater rating plate for determining the minimum gas supply pressure for obtaining the maximum gas ca pacity for which this heater is specified Prior to starting the heating sequence of the system air needs to be purged from gas supply line up to the Hast ings equipment CAUTION The use of soap bubbles or an electronic leak detector is recommended to check for leaks Do not check for leaks with gas flame torch Do not check for leaks with gas flame torch Do not depend on sensing the odor of gas to determine if the air has been purged from the gas line The unit is equipped with an electronic modulating gas valve which is controlled by a discharge sensor located in the discharge opening Check to see that the sensor is properly positioned Set the selector dial for desired dis charge temperature factory set at 70 If 70 F discharge temperature is not desired move appropriate discharge selector dial to new position and set inlet air controller to a temperature at least 5 F below this setting Note No adjustment required on modulating gas valve High and low fire positions are factory set for proper operation In some cases it may be possible or desirable to reduce the low fire be sure to keep continuous flame the full length of burner Check setting of inlet air controller This is factory set at 65 F to shut down burner when outside temperature
23. des Control panel is furnished with components wired to coded terminal strip Installer to connect numbered ter minal blocks on remote control panel to corresponding terminal block s in master control panel on unit i following table should be followed for proper low voltage wiring of remote control panel based maxi mum voltage drop of two 2 volts 6 j Wire Size Maximum Wire Length in Feet PUN TI au c 160 yu 245 115 395 Wiring diagram level referencing shielded cable for remote temperature dial connection 10 Miscellaneous Installation Guidelines a All sections not shipped attached must be assembled in the field by 1 4 20 x 5 8 sheet metal screws provided in the cloth bag with each ship along section See previous instructions Important Notice to Equipment Users or follow general arrangement drawing provided for this unit to determine which items are crated and shipped separately Figure No 1 through Figure No 4 show typical unit assemblies For outdoor or weather proof models a water proof caulking is provided to seal all joints between optional sec tions as they are bolted together Perimeter caulking on each ship along section must be completed to insure a water tight unit If filter section is used bolt to appropriate section by sheet metal screws provided Provide caulking as re quired Filter
24. e blower motor starter Blower motor will run if blower motor overloads are not tripped Heating coil is inoperative System white light on remote control panel will be on if air proving switch is closed Optional clogged filter light on remote control panel will be operational if a blocked intake or clogged filter situation occurs 12 Winter Operation lf the entering air temperature is below the entering air controller setpoint and the blower is operating the heating coil valve is energized and powered open and the heat on light is energized on the remote control panel Discharge air temperature is controlled by discharge air controller If the entering air temperature is above the entering air controller setpoint the heat is de energized and the blower continues 10 operate d MISCELLANEOUS MAINTENANCE 1 Filters check filters at least once each season and clean or replace as necessary Standard filters are of the heavy duty fiberglass mesh throw away type No attempt should be made to clean and re use these filters Replacement filters should be an equivalent to the type supplied standardly with the unit See bill of material for size type and number required The optional cleanable filters are of the high velocity aluminum mesh type These filters may be washed with water as the mesh is originally coated with a water soluble oil solution The filters should be dried and recoated with oil solution such as Evans Filte
25. f blower discharge arrangements are available on request Cabinet All cabinet parts are made from coated steels All outside surfaces are primed and finish coated Lifting lugs are provided for ease in handling see Figure No 1 and Figure No 2 Blower s There are one or two centrifugal DWDI forward curved fan s SB 240 provided with 2 backward incline fans with a one piece solid shaft or self aligning prelubricated ball bearings on each unit Blower wheel s are stati callv and dvnamicallv balanced Adjustable drives are standard on all units through 10 HP An open drip proof ball bearing squirrel cage induction T frame motor is provided as standard for all voltages Gas Burner The burner is a direct fired non premix design with cast iron manifold and stainless steel mixing plates A spark ignited intermittent pilot for natural or propane gas at inlet pressure from 6 ounces through 1 pound is standard The burner is capable of a 22 1 turndown ratio Maximum temperature rise is 119 F Gas and electric Controls The following are furnished as standard components on all direct gas fired units NEMA 1 control box remote control station with switches and indicating lights electronic flame safeguard svstem with ignition transformer pilot controls and electric safetv shut off valve main gas hand shut off valve main and pilot gas pressure regu lators motor starter control transformer high temperature limit switch air flow switch automat
26. ic mild weather burner cut out and a modulating gas control svstem If the low temperature control svstem is not an integral part of the heater then it is recommended that a low temperature limit control be installed in areas where freeze up protection is needed in the event of burner shut down Electric Heating The following are furnished as standard components on all SBE electric heating units the heating section is UL listed with open tvpe electric heating elements control panel circuit fuses step controller and transformer with primarv and secondarv fusing automatic reset thermal cut out heat limiter tvpe secondarv safetv protection de energizing contactors and connecting block s for wiring of power supply All fusing and UL Control transformer and disconnecting means are optional Steam or Hot Water Heating The following is standard on all SBS and SBW units coil section for indicated pressure or water temperature Heating units shall have standard type coil Heating ventilating and make up air units shall have steam distribut ing type coil s Steam or hot water valves linkage and valve motors are shipped for field mounting and wiring Control System The standard control system permits the unit to operate for make up air heating or heating and ventilating pur poses or run the blower s only for summer ventilation Refer to the detailed sequence of operation included with this manual for exact unit operation
27. if a Main disconnect switch or circuit breaker closed b All main fuses if disconnect switch used are in line c Control transformer is supplying 115 volts to control circuits d Season switch in remote control panel in summer position or if in winter position that heating control relay coil is energized and contacts are closed Freezestat s are n c and in the electrical circuit Freezestat control relay coil energized and contacts are closed Also check the following optional controls if used to see if a Damper motor end switch is closed damper motor must be full open If blower runs but remote control panel blower light doesn t come on air proving switch is faulty discharge is blocked belt s are loose and slipping or blower is running backwards Also check to see if air proving sensing tube is plugged or has been crimped If blower operates and blower signal light is on but system fails to heat air to desired temperature check to see if a Season switch in remote control panel is in winter position Heating relay contacts are closed Two position or modulating valve and controller if modulating system is functioning properly All steam and hot water lines are open and free flowing Steam pressure water temperature and flow rates are per specifications o On two coil systems that outside air temperature controller is functioning properly NOTE We cannot guarantee coi
28. ion control system is not directly exposed to water spray rain or dripping water Identify the entry location s for field installed wiring and control wiring Adequate instructions shall be provided for field wiring of equipment if applicable An electric disconnect switch having adequate ampacity see marking on the heater for voltage and ampacity if not provided as part of the heater shall be installed in accordance with Article 430 of the National Electrial Code ANSINFPA 70 c If not supplied by the factory provide a disconnect switch having adequate ampacity see specification plate on heater for voltage and ampacity and install in accordance with Article 430 of the National Electrical Code ANSI NFPA 70 d Install heater such that the ignition system is not directly exposed to water spray rain or dripping water e Refer to markings on heater control box for locations for field installed wiring and control wiring 5 Piping Connections a All gas piping connections are not shown in this manual because of the many manifold arrangements available due to approval codes and types of gas modulation All gas piping must comply with Standard of National Board of Fire Underwriters and all applicable local codes Contact factory if exact gas piping dimensions are required Standard pipe caps are furnished on manifold for shipment from factory Run correctly sized gas line to unit Install manual shut off valve and regulator if not already i
29. ions Signal Lights Pilot lights are rectangular neon type for 115 V A C service Lights are UL approved and have 18 AWG 16 30 standard 105 C plastic wire leads Bezel is chrome finished Switches On Off and On Off ON switch action with screw terminals Rated at 15 AMPS at 115 V A C service with 3 4 HP rating at 115 V A C Lids and Cover Remote control panel lids are 16 gauge brushed stainless steel 1 8 high letters are screen painted using Wornoy Duwell Enamel series 10 000 ink Wiring box dimensions are 8 x 5 x 3 1 2 deep Terminal Blocks Blocks are medium duty 15 AMP screw type All terminals are numbered according to corre sponding wiring diagram Wiring All wiring is 16 AWG 16 30 standard 105 C thermoplastic or equivalent Wiring is color coded per corresponding wiring diagram 9 Remote Control Panel Installation a Refer to Figure No 9 b Align box with spirit level c If box is to be surface mounted three 3 mounting holes in back of box are recommended One in each top corner and one at bottom center d If mounting holes are to be located in side of box as shown four 4 holes are recommended Two at top and two at bottom e If wiring box is to be recessed install so that open edge of box will be flush with finish Install optional flush mounting wall plate f Examine wiring box and control panel for clearance before providing conduit hole s All wiring must comply with applicable electric co
30. ith the applicable building code provisions for ventilation air Provide the following clearances Control Side 48 from unit mounted Main Control Panel Opposite Control Side 12 Top 12 Bottom 12 from combustibles Front 36 Rear 36 If main disconnect switch is shipped unmounted or provided by installer a minimum clearance of 48 is required and must be within sight of the unit Location of Accessories The remote control panel will be located in the burner or electric section of the unit and must be removed and in stalled by the electrical contractor Remote control panels for air handling units will be located in the blower sec tion for shipment See remote control panel details in this bulletin Field constructed intake accessories should be properly designed to minimize the entry of snow and rain Instructions should be given that adequate building relief must be provided so as to not over pressurize the building when the heating system is operating at its rated capacity It should be noted that this can be accomplished by taking into account through standard engineering methods the structure s designed infiltration rate by providing properly sized relief openings or by interlocking a powered exhaust system or by a combination of these methods Electrical Connections a All wiring must comply with all applicable local state provincial and national electric codes Prior to running power to the u
31. ls against freezing but the likelihood of freezing can be minimized if the installer I takes the following precautions Provide adequate sizing of condensate return lines traps and vents to provide for speedy flow of condensate from the coil Do not bush or reduce return trapping size Do not drain steam mains or branch lines through coils Steam lines should always be drained ahead of control valves When more than one coil section is installed a separate steam trap must be provided for each Use only bucket or float and thermostatic traps for condensate removal Use thermostatic traps for venting only Steam traps should be sized for three 3 times the calculated condensate load at coil design conditions Traps should be selected for the pressure differential across the trap not boiler pressure Strainers should be installed ahead of traps to prevent dirt and sludge from affecting operation 18 9 Vacuum breakers should be provided 1 2 15 degree swing check valve is recommended installed close 10 the coil as possible The vacuum breaker line can be vented to atmosphere or connected into the return line on the distant side of the steam trap on low pressure systems steam systems at 15 PSIG and above and condensable gases should be continuously vented from the return by a 1 4 petcock in a riser off the condensate return ahead of the trap petcock should be
32. nal 8 SEQUENCE OF OPERATION 1 Typical sequence of operation direct gas fired units Closing fused disconnect switch supplies 115 volt power to control circuit through 115 volt control transformer Unit is ready for operation Summer Operation If three position season switch is in the summer position and two position blower switch is on power is supplied to the two position fresh air discharge air damper motor After approximately one minute the damper motor has reached its full open position closing the damper proving switch Power is supplied to blower motor starter Blower motor will run if blower motor overloads are not tripped Burner is inoperative System white light in remote control panel will be operational Winter Operation If three position season switch is in the winter position and if the high limit switch is operational blower starts as explained in summer operation above If air flow is sensed by the air proving switch and auxiliary starter contacts are closed power is supplied to burner protectorelay If entering air temperature is below the setting of the entering air temperature controller protectorelay powers igni tion transformer and pilot valve opens When pilot is lit flame rod detects pilot flame and ignition transformer drops out of electrical circuit Main gas solenoid valve opens and pilot lights main burner The alarm safety switch lock out terminals will close if detection of
33. nce with local and national codes Again check supply voltage against unit voltage If an electric heating section is supplied check supply voltage against element voltage Check all electrical connections in the main control panel and remote control panel Check that all fuses are installed and that fuse sizing agrees with the unit bill of material If optional steam hot water or chilled water coils are supplied check to see that all piping connections are secure and that face areas of coil s have not been damaged or blocked Tr n 8 Check to see if all gas connections are tight and that all joints been properly lubricated 9 Check to see if all condensate drain piping has been completed if required 10 Insure that all insulation is fastened securely to walls ceiling and floor areas 11 Check blower supply area to insure freedom of shaft rotation and proper belt tension Remove any shipping blocks and isolation support frame securing bolts if ordered 12 Check blower motor to insure that pulleys are secure and drive belts are tight 13 Check filters for cleanliness and in the case of throw away filters make certain that they are free of moisture Note Wet filters will collapse under static pressure and the media will be sucked into the downstream sections of the unit 14 lf any optional dampers are supplied make certain that all dampers linkage is free to move and that no binding will occur If dampers a
34. nit visually inspect all nameplates control voltage wiring control transformer and main fused disconnect switch on the unit cross check with bill of material to insure that the voltage option on the order is the voltage option received If optional motorized dampers used connect electrical wires supplied factory furnished conduit with unit to damper motor shown on electrical wiring diagram Adjust linkage so that damper will close when blower switch in remote control panel is in off position For Series 14 or Series 44 selectra modulation with tempera ture selector dial which is shipped unmounted or mounted on remote panel the wiring for the dial must be shielded cable or ran in separate conduit Complete all wiring to any optional accessories as shown on unit bill of material and electrical wiring diagram as required before applying voltage to the unit b The total amperage of the main fused disconnect switch blower motor and control circuit transformer fusing is affected by the addition of 25 to the full load amps as required by the National Electric Code Check the supply voltage before energizing the unit The maximum voltage variations should not exceed 10 Phase voltage unbalance must not exceed 2 Use proper wire sizing practices when running wires for the re mote control panel If the automatic gas ignition control system is exterior to the heater the heater shall be in stalled such that the gas ignit
35. nstalled Note gas line pressure must be as shown on specification plate when unit is operating at full input Vent pressure regulator s and vent valve if included with unit to outside of building With vent pipe outside install a proper vent cap and or screen to prevent entrance of foreign material and plugging The heater and its individual shutoff valve must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures in excess of 1 2 psi 3 5 kPa The heater must be isolated from the gas supply piping system by closing its individual manual shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or less than 1 2 psi 3 5 kPa b If steam hot water or chilled water coils are used all piping connections must be made according to accepted trade practices or the general arrangement drawings furnished with the unit Because of the many variations of supply and drain connections required it is not possible to include all piping connections in this manual Piping must comply with Standards of National Board of Fire Underwriters and all applicable local codes Standard pipe caps are furnished on manifold for shipment from factory c Pipe couplings for connection of condensate drains on applicable units are furnished Standard pipe caps are furnished for shipment from factory A trap must be installed in the drain line to minimize the loss of conditi
36. of power fuel or misuse will not constitute need for any return calls 3 Factory Operations Test All air handling heating ventilating and make up air units are given complete operations test and control cir cuit check out before final shipment A copy of the flame test report and bill of material with testers certifications stamp is included with each unit shipped Inspection of Shipment Upon Arrival Shipments are made F O B Hastings Nebraska by truck unit is securely strapped tied and blocked to prevent shipping damage All shipments are checked by an inspector before they are accepted by the carrier Parts that are shipped unmounted are noted on the bill of materials These parts where feasible are packaged and shipped with the units Upon receipt of shipment all units should be checked against the bill of lading to insure all items have been received The units should be checked carefully for physical damage in the presence of the carriers representative If parts are missing or damage has occurred a claim should be filed immediately with the carrier Widely varying conditions under which the units are transported to the jobsite unloaded and installed make it impossible for Hastings to assume responsibility for handling of equipment in transit D SPECIFICATIONS 1 General Units are of the horizontal type with choice of HR 1 HR 2 and HR 3 blower discharge arrangements Vertical units and units with a variety o
37. ol components Also check the following optional controls if used to see if a Main gas cock is open units equipped with manual reset low gas pressure switch must have gas at switch for proper switch operation Low gas pressure switch in circuit manual reset switch High gas pressure switch in circuit manual reset switch Damper motor end switch is closed damper motor must be full open Low limit temperature control setting too high or n c over riding timer contacts open Access switch es open NOTE If other optional controls are supplied on special applications check to see if they in the electrical circuit 2 If blower runs but remote control panel blower light doesn t come on air proving switch is faulty discharge is blocked belt s loose and slipping or blower is running backwards Also check to see if air proving switch sensing tube is plugged or has been crimped Also check to see if RPM and CFM required match specification plate on unit Confirm burner profile opening dimensions contact factory for data a Ifa pre purge timer separate from programming relay is used blower light won t come on until unit has purged 15 3 7 8 b light in remote panel will not function until all air proving safety controls are operational NOTE Units that have SP L and AP H air proving switches are factory set and not to be tampered with AP L is set to 25 w c
38. oned air d Refer to heater rating plate for determining the minimum gas supply pressure for obtaining the maximum gas capacity for which this heater is specified 6 Duct Connection s a Indoor Units See Figures No 3 and No 4 1 Lifting lugs serve as suspension points on all indoor type units see Figures No 5 and 6 2 Make required opening in wall and line with an angle frame Inside should be completed before outside is started to avoid any crumbing of penetrated wall see Figure No 7 Insert insulated fresh air collar through the opening with flanges turned out to provide rigidity Anchor intake hood with birdscreen to outside of wall Caulk perimeter of opening to make connection water tight 5 6 Units with VUR 1 HR 3 vertical upblast discharge arrangement must have discharge ductwork sup ported from building support members and not supported from the equipment NO DISCHARGE DUCT WORK IS TO BE SUPPORTED BY EQUIPMENT DISCHARGE OPENING CONNECTIONS NOTE On indoor units intake hood and birdscreen and any appropriate ductwork must be full size of unit opening b Outdoor Units See Figures No 1 and No 2 1 Prior to assembly of unit sections accessories caulking must be applied to the flat surfaces where the pre punched fastener holes are located See Figures No 1 2 and 10 on each section Caulk pe rimeter of opening to make connection watertight 2 Units with a vertical upblast
39. osition Then gradually reduce low fire stop or bypass till fire tends to go out Increase to the smallest stable 1 1 1 2 flame length full length fire If a local weak spot appears check for clogged low fire air ports or extreme turbulence at affected portion Make low fire adjustments patiently Due to low gas flow rate re sponse to adjustments will be slow Modulation System a Unit with Selectra Modulation See page 11 for valve information 1 Standard selectra system Series 14 a MR212 valve high fire manifold adjustments 1 Disconnect wires from terminal 4 in the amplifier see page 11 this causes the valve to call for continuous high fire 2 Remove seal regulator pressure adjusting screw 10 obtain desired manifold pres sure Clockwise rotation increases pressure see page 11 3 Reconnect the wires to terminal 4 b MR212 valve low fire or by pass adjustment 1 Disconnect wire from terminal 8 in the amplifier see page 11 This causes the valve to call for continuous low fire 2 Remove seal cap B and loosen lock screw C Turn D to desired low fire adjustment Clockwise rotation reduces minimum flow rate see page 11 3 Tighten set screw C replace cap B and reconnect wire to terminal 8 c MR611 valve high fire manifold adjustment 1 Disconnect wires from terminal 4 in the amplifier see page 11 This causes the valve to call for continuou
40. ow through unit has been proven by blower air proving switch the electronic sequencer will modulate for desired heat if power is supplied to sequencer through sequencer control transformer and automatic reset thermal cutout Heating is controlled by the modulating sequencer through the action of the over riding modulating room thermo stat If the discharge temperature of the unit falls below the setting of the modulating discharge air controller the over riding room thermostat is over ridden and heating output is increased until the modulating discharge air con troller is satisfied If the discharge temperature of the unit rises above the setting of the modulating high limit control the over riding room thermostat is over ridden and heating output is decreased until the modulating high limit control is satisfied The sequencer automatically recycles to the off position on any interruption of power System heating light in remote control panel will be on when season switch is in the winter position Typical sequence of operation steam hot water units Closing optional main disconnect switch supplies 115 volt power to control circuit through 115 volt control transformer Unit is ready for operation Summer Operation If three position season switch is in the summer position and the three position blower switch is in the posi tion and the entering air temperature is above the freezestat setting power is supplied to th
41. p A and reconnect wire to amplifier terminal 8 M411 511 611 VALVE High Fire Manifold Adjustments ia Fire Manifold Adjustments 1 Disconnect wires from amplifier terminal 2 amp 4 This causes the valve to go to continuous high fire 2 Remove seal cap a and turn MODULATOR regulator pressure adjusting screw to obtain desired manifold pressure Clockwise rotation increases pressure 3 Reconnect the wires to amplifier terminal 2 amp 4 NOTE l low fire bypass is on maximum the desired high fire outlet pressure may not be achieved Low Fire or Bypass Adjustments Disconnect wire from amplifier terminal 8 this causes valve to go to continuous low fire Remove cap B and loosen lock screw C Turn D to desired low fire adjustment Clockwise rotation reduces minimum flow rate Tighten set screw replace B and reconnect wire to amplifier terminal 8 11 Disconnect wires from amplifier terminal 2 and 34 this causes the valve to go to continuous high fire Adjust the pressure regulator to obtain the desired manifold presure 7 w c maximum Reconnect the wires to amplifier terminal 2 8 4 amplifier terminal 8 this causes the valve to go to continuous low fire Remove cap A and turn adjusting screw B to desired low fire adjustment Clockwise rotation reduces minimum flow rate Replace cap and reconnect wire to amplifier termi
42. r Fluid Replacements for damaged filters should be of an equivalent type as originally supplied with the unit See bill of material for size type and number required The oil coating solution is available from the filter manufacturer Filter racks as supplied with some sizes of SB units may have at least one filter spacer to eliminate the by passing of unfiltered air These spacers if used must be re installed after the completion of any maintenance work Blowers check blower and related components at least twice yearly Blower motor bearings need periodic lubrication Motor bearings vary with size and type of application Refer to motor instructions for proper maintenance schedule Belts must be tightened as explained previously if so required Check pulleys for proper alignment Lubricate main fan bearing with a high grade lithium base grease Perform at least every quarter three months or schedule according to equipment use Blower belts should be checked twice a year for wear and adjustment See data below Burner Check orifice openings annually contact factory for proper orifice drill size for cleaning 13 MOTOR ADJUSTING BOLT AND BELT TENSION FOR BELT DEFLECTION TABLE BELOW TOO TIGHT SLIGHT BOW TOO LOOSE MOTOR ADJUSTING BOLT DEFLECTION TABLE Deflection Force Belt Cross Section marked Motor Pulley Pitch Diameter Minimum 3 0 3 6 2 62
43. rating Amber signal light marked heating should indicate that the burner is operating If pilot does not light depress reset button on programming relay If it becomes necessary to adjust pilot flame check the micro ampere reading Adjust to obtain a micro am pere reading of 2 Make sure all gas cocks are open and gas pressure switch es if required are reset for burner operation Unit is factory pre set to provide gas pressure as specified on unit spec data plate mounted on unit for standard burner when firing at full input Before making any regulator adjustments be sure there is sufficient inlet pressure The burner will come on at high fire initially then gradually modulate down While the unit is on high fire check the flame length It must be approximately 14 18 beyond end of burner Check the manifold pressure should not exceed operating pressure and noted on unit spec plate Check temperature rise and or gas rate If too high set at desired rate by reducing high fire setting for MR or M modulating valve If no high fire adjustment is available reset modulating control to design temperature rise plus current outdoor temperature to approximate full input l input is too low increase setting on main regulator M valve only but not past point where no further pressure crease is evident With burner running reset modulating control point less than incoming air temperature to drive valve to low fire p
44. re No 10 Unit base assembly is shipped separately for field connection to mounting channels and anchoring to floor Op tional filter and or inlet damper section s mount in base assembly see Figures No 11 and 12 All 1 2 bolts and splice plates for unit assembly in the field are included with each unit The vertical SB and LU units are designed to simplify field installation All parts have been designed in module form to facilitate field installation of parts and accessories The purpose of this manual is to supplement but not to replace the services of qualified field personnel to supervise the initial start up and adjustment of vertical SB and LU units Persons without previous experience with large commercial and industrial make up air equip ment should not attempt the initial adjustment and check out procedure essential before such installations may be considered as ready for operation F PRE START INSPECTION This inspection is extremely important and should be completed with greatest care given to detail A good pre start in spection will insure against possible unit damage on start up and will save valuable analysis time in the event malfunc tions occur on start up and check out 1 N m N Check to see that all factory installed plastic pipe plugs have been removed from gas valve inlet and any shipped along gas pressure regulators and manual hand valves Make sure all field wiring and gas piping are in accorda
45. re of the modulating type check control capillary tubes to insure that the tubes will not rub against any stationary objects 15 Check all areas for cleanliness 16 Secure all access doors 17 Check all canvas connectors where used between the unit and any duct work used 18 Instructions specify that service personnel shall perform a gas leak check during heater start up to verify the gas tightness of the heater s components and piping under normal operating conditions 19 Adequate instructions shall be provided for adjusting the pilot flame 20 Adequate instructions shall be provided for checking the gas tightness of the safety shut off valve s 21 Check blower shaft coupler alignment on units with backward incline fans or split fan sets 22 Follow all list pre checks prior to start up as listed on factory start up information form sent with equipment G START UP All safety and operating controls have been checked during the factory test period however it is advisable to complete a similar check when first operating the unit 1 Remove any shipping blocks from gas units only a High limit switch if mercury bulb type mounted on burner cabinet Remove limit switch cover remove paper blocking and tilt mercury bulb to reset b Gas pressure switch es if required may have shipping screws Remove screws if supplied c Unit programming controller may be shipped with a paper shipping block Remove programmer cover
46. s and filter spacer s if required will be shipped installed in filter rack wherever possible If filters are shipped separately install filters and filter racks see filter maintenance for details Filter spacer s will be banded to filter channel where shipping necessitates filters going separately from filter section If intake or discharge dampers are used bolt to appropriate section with sheet metal screws provided Provide caulking as required Re connect conduit and wiring to damper motor s as required Electrical wires for damper motor s have been tagged for ease in connecting in the field Vertical Unit Installation see Figure 10 All sections not shipped attached must be assembled in the field with splice channels and 1 2 bolts that are provided Models SB 112 through SB 218 are shipped with burner section and blower section assembled LU models are all produced with blower and burner in a common cabinet Intake hood and birdscreen filter sec tion intake or discharge damper sections or other large accessories are assembled but shipped as individual items Models SB 222 through SB 240 are shipped as separate sections All sections are shipped in a horizontal position SB 112 through SB 218 has top mounting channel and base channel shipped assembled with blower burner section SB 222 through SB 240 has top mounting channel shipped as one section but not physically attached to either blower or burner section see Figu
47. s and to check that bearing lock rings are tight Open the cover on the electrical control box located at the top on the side of the burner section blower section if air handling unit only Box can be opened by turning main fused disconnect switch to the off position disconnect is optional on air handling equipment Inspect all wire terminals and wiring terminations to ensure connections are tight If unit is supplied with an electric heating section check the separate electrical terminal box for any loose connections Locating the Unit Prior to locating the unit authorities having jurisdiction should be consulted before installations are made Ap proval permits should be checked against the unit received Locate the unit exactly level making certain there is enough clearance for opening and removing access doors Special attention should be given to supply if required and discharge duct connections Electrical power and control hook up points and steam or hot water supply and return lines if required should also be noted This in formation should be cross checked with the position of support beams and stand pipes to insure that support structure dimensions coincide with those of the unit Under structure beam spacing should also be checked to preclude any interference with air ducts Allow adequate clearance on both sides of unit for access to bearings motor and all internal components The heater inlet shall be located in accordance w
48. s high fire 2 Adjust the pressure regulator to obtain the desired manifold pressure 7 WC Max 3 Reconnect the wires to terminal 4 d MR611 valve low fire or by pass adjustment 1 Disconnect wire from terminal 8 in the amplifier see page 11 This causes the valve to call for continuous high fire 2 Remove cap A and turn adjusting screw B to desired low fire adjustment see page 11 3 Replace A and wire to terminal 8 NOTE If calibration of the amplifier or remote temperature selector is necessary place an accurate tem perature measuring device as near the discharge air sensor as possible Set the remote temperature at least 10 F above the outside air temperature 1 If calibrating at the amplifier adjust calibration potentiometer A see page 11 until temperature reads the same as the set temperature If the temperature is below the set point then rotate cali bration potentiometer A clockwise If the temperature is above the set point rotate the calibration potentiometer counter clockwise 2 If calibrating the remote temperature selector rotate the calibration potentiometer A see page 11 until the correct temperature is obtained If the temperature is above the set point the calibration potentiometer A should be turned counter clockwise 24 Once start up is complete set temperature selector dial at desired temperature Turn Summer Off Winter switch to the
49. stablish power and re check blower operation On three phase unit the starter contacts should pull in and hold quietly without clatter relays serve as starters on single phase units If they do not operate quietly check immediately for proper line voltage Even temporary low voltage at start up will cause constant operating trouble and must be corrected before SB unit is placed in service If the motor current is excessive adjust the variable speed pulley standard through 10 hp on the motor to lower the amp draw on the motor Caution Current readings should be taken with the access door in place Re check all set screws on motor sheave blower sheave and blower wheel s Check alignment of belts and pul leys Lubricate blower bearings prior to start up per instructions in section Miscellaneous Maintenance ltem 3 Run blower for a few minutes and adjust motor take up if necessary Do not over tighten belts since excessive tension will reduce belt life and cause excessive load on bearings After initial start has been made give the belts a few days running time to become seated in pulley grooves re adjust take up bolt s as necessary Run drive at full speed and adjust take up until only a slight bow appears in the slack side of the belts Do not roll belts over grooves or sheaves as this results in permanent belt damage Open hand valve and pilot cock Move season switch to winter position to light pilot blower must be ope
50. veling must be applied to the curb applica tion of shims to the unit will tend to destroy the sealing effect after installation Make sure sealing tape and adaptor strip are in place before unit is set A bubble level must be used in the leveling process Squareness must be checked by measuring diagonals Allowable tolerance is 1 4 difference between diagonal measurements Double check approval prints before setting of unit Upon completion of setting the curb apply roofing material and flashing as required The unit manufacturer will not assume responsibility for leaks if the curb adaptor gasket provided by others and sealing tape provided by others are not used Be careful not to allow gaps where two pieces of sealing tape meet Unit is now ready for setting on the roof SBD 222 227 233 and 240 require a field fabricated sheet metal skirt around base of unit Contact factory for de tails SECTION 3 L TROUBLE SHOOTING THE DIRECT GAS FIRED UNIT 1 If Blower Fails to Operate Check to See If a Main disconnect switch or circuit breaker closed b All main fuses if disconnect switch used are in line c Control transformer is supplying 115 volts to control circuit d Blower switch in remote control panel is on e High limit control is in circuit manual reset switch f Magnetic motor starter is in circuit manual reset starter g There are any loose wires or connections in blower circuit at either terminal block or contr
51. y ON 38 9131 HIANLOVJANVA LINN GHHSINHN4 LON SOY NOISN3dSfS SNOLdO 0 ANY GIOJINVW HLIM ANYA TIIM SLNIOd NOISN3dS S WNHOJLV Id 39IAM3S ILON 23 NOIL 3S 235 HINHNA SINIOd NOISN3dS S S NI 1 39IAM3S ONIGNIONI LINA 930339505 000 Ovc 8S HONOYHL 000 8565 380913 HINANLIVINNVW LINQ GSHSINYN4A LON 500 NOISNJdSAS SNOILdO IOMINO5 GIOJINVWA ANYA TIM SLNIOd NOISN3dSfS ALON NOILOAS 235 1 SLNIOd NOISN3dSf S 5901 ONIGNION 1 355 LINA 86 01 HONOYSHL CLL N1 816 95 HINOYHL 214 6865 IVOldAl 24 CHINNLIVANNVW LINN GIHSINHNI LON 5004 NOISNIANS SNOILdO IOYLNOJ IOHINVN 4VA TIIM SLNIOd NOISNSdSNS NOILOAS 0 0 9 ON NOILOAS HINANA SINIOd NOISNSdSNS 5901 ONIOfTIONI A I A3SSV LINN 801 0684 HONOYHL 11 083 Or 85 HONOYHL 8S 25 TYPICAL DUCT CONNECTON INDOOK UNITS ANCHOR TO WALL BIRVOCREE 2 WALL 2 NGLE FRAME DUC ENER RESH AIR DUCT FIGURE NO 7 26 SUMMER WINTER BLOWER SEASON F
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