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A.O. Smith 186965-001 Water Heater User Manual

1. Gas Supply Cold Water Supply Line Hot Water Supply Line Optional Header Sized One Pipe Size Larger Than Hot Water Supply Line To eliminate cold water sandwich effect caused by frequent On Off operation Gas or Electric Tank Water Heater sized to Tank Water maintain circulation loop Heater temperature Aquastat Connection Smaller Return Line Can Be Used After The Last Fixture Expansion Tank Building Outlets Domestic Hot Water Circulation Systems 3 On Demand Water Heaters with Gas or Electric Tank Preferred Piping Installation Key 3 4 Ball Valve TNN Check Valve Y Pressure Regulator FA Boiler Drain Valve 3 4 Union K Pressure Relief Valve A Circulating Pump Sa Solenoid Valve o Mixing Valve NOTE This drawing is not intended to describe a complete system and is not a replacement for a pro Drawing Date fessional engineering drawing It is intended only as a guide and does not imply compliance with local September 07 2008 building code requirements Confer with local building officials before installation The Contractor or engineer is to determine the necessary components and configuration of the particular system to be in Drawing Number stalled It is the responsibility of the engineer or contractor to ensure that the installation is in accordance H 3 R P with all local building codes For this application On Demand
2. Typical water ii Line As water is heated it expands thermal expan piping installation K coi Water 7 Pressure Reducing Inlet vane K i with Gees sion In a closed system the volume of water will grow As the volume of water grows there 5 i i Hot Water Cold E Supply will be a corresponding increase in water pres Outlet west Water sure due to thermal expansion Thermal expan l l SES sion can cause premature tank failure leakage This type of failure is not covered under the Temperature and SR S P Relief Val limited warranty Thermal expansion can also SE cause intermittent temperature pressure relief valve operation water discharged from the valve R Storage due to excessive pressure build up The temper Tank ature pressure relief valve is not intended for the constant relief of thermal expansion This condition is not covered under the limited war Discharge line ranty 6 Max above drain A properly sized thermal expansion tank should 1 Min R Drain line 3 4 In be installed on all closed systems to control the Massachusetts Metal Drain Es harmful effects of thermal expansion Contacta Ean 134 ss GES in gold weier line per local plumbing service agency to have a thermal Section t2 MGL Lig expansion tank installed For Storage Tank System Installation Temperature and Pressure Relief Valve For protection against excessive pressure
3. Hot Water Supply Line On Demand Water Heater Sub 2 il y On Demand Equipment List QTY On Demand 4 Water Heaters Electronic Connection Refer to On Demand Accessories and Model Applicability for electronic connection details On Demand Water Heater Sub 3 Ze 1 A 2 L Gas Supply Stee Ge Cold Water Supply Line Domestic Hot Water Standard Installation 4 On Demand Water Heaters Preferred Piping Installation Key O 3 4 Ball Valve PA Check Valve 3 4 Union Pressure Relief Valve Pressure Regulator KX Boiler Drain Valve D Circulating Pump Solenoid Valve Mixing Valve Ko NOTE This drawing is not intended to describe a complete system and is not a replacement for a pro Drawing Date fessional engineering drawing It is intended only as a guide and does not imply compliance with local September 07 2008 building code requirements Confer with local building officials before installation The Contractor or engineer is to determine the necessary components and configuration of the particular system to be in Drawing Number stalled It is the responsibility of the engineer or contractor to ensure that the installation is in accordance H 4 with all local building codes On Demand Equipment List On Demand Water Heaters Electronic Connection Refer to On Demand Accessories and Model Applicability for electronic connec
4. O 3 4 Ball Valve PJ Check Valve Y Pressure Regulator KX Boiler Drain Valve 3 4 Union K Pressure Relief Valve A Circulating Pump Se Solenoid Valve Mixing Valve NOTE This drawing is not intended to describe a complete system and is not a replacement for a pro Drawing Date fessional engineering drawing It is intended only as a guide and does not imply compliance with local building code requirements Confer with local building officials before installation The Contractor or September 07 2008 engineer is to determine the necessary components and configuration of the particular system to be in Drawing Number stalled It is the responsibility of the engineer or contractor to ensure that the installation is in accordance with all local building codes H 6 E For this application Pump should be controlled by an Aquastat Timer or Combination Aquastat and Timer Pump to be sized to maintain circulation loop temperature The pump should be sized to overcome the pressure loss through the tank water heater and supply and return plumbing in the circulation loop Reference the section Pump Sizing for Circulation Pump to be of bronze or stainless construc tion On Demand Water Heater Sa a Minimum 3 4 Cold Water Supply Line Minimum 3 4 Hot Important On Demand Equipment List On Demand Water Heater as Supply Line Key O 3 4 Ball Valve 3 4 Union NOTE This draw
5. B 2 Determine the acceptable temperature drop at the last fixture in the loop For example if the supply temperature from the water heater is 120 F 49 C and an acceptable temperature at the last fixture is 100 F 38 C then the acceptable temperature drop is 20 F 7 C 3 Calculate the required pump flow rate using the following formula FLOW RATE gpm HEAT LOSS BTU h 500 X ACCEPTABLE TEMPERATURE DROP F 4 Based on the above calculations select a pump for the type of circulation system you will be utilizing A Preferred Method reference drawing H 1 RP Reference pump manufacturers flow vs pressure specifications to select a pump that can provide the flow rate calculated above while overcoming the pressure loss through e Tank water heater reference manufacturer s information e All building supply and return plumbing in the circulation loop reference local plumbling codes standards or practices B Optional Method H 1 RO Reference pump manufacturers flow vs pressure specifications to select a pump that can provide 3 gpm of flow or the flow rate calculated above whichever is greater while overcoming the pressure loss through e On demand water heater reference flow vs pressure curve of the model being used e Optional storage tank reference manufacturer s information e All building supply and return plumbing in the circulation loop reference local plumbling codes standards or pr
6. Equipment List Pump should be controlled by an Aquastat Timer or Combination Aquastat and Timer bad Pump to be sized to maintain circulation Water Heaters loop temperature H H Electronic Connection The pump should be sized to overcome the pressure loss through the tank water heater Refer to On Demand Accessories and Model Applicability for ano supply SEH e electronic connection details circulation loop Reference the section Pump Sizing for Circulation Pump to be of bronze or stainless construc tion ES g o o On Demand On Demand On Demand Water Heater On Demand On Demand On Demand Water Heater Water Heater Water Heater Water Heater Water Heater Sub 1 Sub 2 Primary Sub 2 Primary o o Io l IK l A Gas Supply di Bt E E Af A fk sd lt 1 ae J Pressure Regulator Set to 5 PSI Below Street Pressure Cold Water Supply Line Hot Water Supply Line Optional Header Sized One Pipe Size Larger Than Hot Water Supply Line To eliminate cold water sandwich effect Tank Water Gas or Electric Heater sized caused by frequent On Off operation Tank Water to maintain circulation loop Heater temperature Aquastat Connection Smaller Return Line Can Be Used After The Last Fixture E
7. 4 Union K Pressure Relief Valve E Circulating Pump d Solenoid Valve Mixing Valve NOTE This drawing is not intended to describe a complete system and is not a replacement for a pro Drawing Date fessional engineering drawing It is intended only as a guide and does not imply compliance with local September 07 2008 building code requirements Confer with local building officials before installation The Contractor or engineer is to determine the necessary components and configuration of the particular system to be in Drawing Number stalled It is the responsibility of the engineer or contractor to ensure that the installation is in accordance H 3 E with all local building codes IMPORTANT With electrical power supplied to a on demand water heater it will not freeze in enviornments as cold as 30 F when protected from direct wind exposure In the event of a power failure at temperatures below freezing the water heater should be drained of all water to prevent freezing damage The unit may be drained manually or through the installation of the Optional solenoid valves as shown The electrical connections for the two solenoid valves should be tied to the 120V power terminals provided on the PC Board of the water heater When the electrical power to the water heater fails the cold water supply solenoid valve closes stopping the flow of water into the heater and the drain down solenoid valve opens allowing the water heate
8. Place the drain hose H3 and the hose H2 to the pump inlet into the cleaning solution Open both service valves V1 and V2 on the hot water and cold water lines Operate the pump and allow the cleaning solution to circulate through the water heater for at least 45 minutes 9 Turn off the pump 10 Rinse the cleaning solution from the water heater by a remove the free end of the drain hose H3 from the pail b close service valve V2 and open shutoff valve V4 Do not open shutoff valve V3 c allow water to flow through the water heater for 5 minutes d close service valve V1 and open shutoff valve V3 11 Disconnect all hoses 12 Remove the in line filter at the cold water inlet and clean out any residue Place filter back into unit 13 Restore electrical power to the water heater Hot Water Line Circulating Pump Maintenace Scale Flush Procedure 1 On Demand Water Heater Key 101 3 4 Ball Valve PJ Check Valve Y Pressure Regulator KX Boiler Drain Valve 3 4 Union K Pressure Relief Valve A Circulating Pump Se Solenoid Valve Mixing Valve NOTE This drawing is not intended to describe a complete system and is not a replacement for a pro Drawing Date fessional engineering drawing It is intended only as a guide and does not imply compliance with local September 07 2008 building code requirements Confer with local building officials before installation The Contractor or engineer is to d
9. freezing the water Outdoor On Demand heater should be drained of all water to prevent freezing damage Water Heater The unit may be drained manually or through the installation of the Optional solenoid valves as shown The electrical connections for the two solenoid valves should be tied to the 120 V power terminals provided on the PC Board of the water heater When the electrical power to the water heater fails the cold water supply i solenoid valve closes stopping the flow of water into the heater and the GE MES Vacuum drain down solenoid valve opens allowing the water heater and Breaker associated piping to drain Ensure that you run the drain for the solenoids per local codes Outdoor On Demand Water Heater NOTE Pipes and fittings can be installed inside a pipe enclosure or recess box and packed with insulation for additional protection NOTE Freeze protect all water pipes and fittings located outside building structure These are indicated Gas Supply Line by being above the dashed line All pipes and fittings shown below the dashed line should be located inside the building structure Minimum 3 4 Hot Water 3 4 Minimum Minimum 3 4 Cold Water The vacuum breaker line should be located inside Supply Line Normally Closed S upply Line the building structure Solenoid Valve 1 4 Minimum Normally Open Solenoid Valve Route drain per local codes Domesti
10. mentally handicapped If anyone using hot Children disabled and elderly are at highest water in the home fits into one of these risk of being scalded groups or if there is a local code or state law requiring a certain temperature water at the Feel water before bathing or showering hot water tap then you must take special precautions AWARNING A Temperature limiting valves are available Installation In addition to using the lowest possible temperature setting that satisfies your hot water needs a means such as a mixing valve should be used at hot water taps used by these people or at the water heater Mixing valves are available at plumbing supply or hardware stores Follow manufacturer s instructions for installation of the valves Before changing the factory setting on the thermostat see table below Using the lowest hot water temperature that meets your needs will also provide the most energy efficient oper ation of the water heater Never allow small children to use a hot water h Temperature Time to Produce 2nd amp 3rd tap or to draw their own bath water Never Settings Degree Burns on Adult Skin leave a child or handicapped person un 160 F 71 C About 1 2 second attended in a bathtub or shower 150 F 66 C About 1 1 2 seconds NOTE A water temperature range of 120 F 140 F 49 C 60 C is recommended by most as O oreo o OU Table A The thermostat of the water heater has been factory
11. 66 gpm 30 head 55 gpm 25 head 12 72 gpm 30 head 60 gpm 25 head 13 78 gpm O 30 head 65 gpm 25 head 14 84 gpm 30 head 70 gpm 25 head 15 90 gpm 30 head 75 gpm 25 head Table C 11 100 101 Series Pressure Loss Curves Pressure Loss ft head udb moj 191eM LL La TT TAATITIA MODA ieee O A o O IO IO Pressure Loss psi Figure 4 12 200 201 Series Pressure Loss Curves Pressure Loss ft head 100 90 20 10 O O Q Q o O N LO Y 059 Q LO e LO N N Ke 45 40 35 3 10 5 0 Pressure Loss psi Figure 5 10 Water Flow gpm On Demand Equipment List On Demand Water Heaters On Demand Water Heater Gas Supply 3 4 Hot Water Supply Line 3 4 Cold Water Supply Line Domestic Hot Water Standard Installation 1 On Demand Water Heater Preferred Piping Installation Key O 3 4 Ball Valve Ny Check Valve Y Pressure Regulator FA Boiler Drain Valve 3 4 Union K Pressure Relief Valve A Circulating Pump d Solenoid Valve Mixing Valve NOTE This drawing is not intended to describe a complete system and is not a replacement for a pro Drawing Date fessional engineering drawing It is intended only as a guide and does not imply compliance with local September 07 2008 building code requirements Confer with local building officials before installation The Contractor or
12. Domestic Hot Water with Backup Storage Tanks 1 Water Heater H 1 T cccsssssccceeeesssssssesseeeeeeeessssssseeseeeeeess 1 Water Heater with Circulation H3 TC 2 Water Heaters H 2 2 Water Heaters with Circulation H 2 3 Water Heaters H 3 T sic Aa vee ate Ma ad A adv 3 Water Heaters with Circulation H 3 6 Water Heaters HG Ti 6 Water Heaters with Circulation H erch Maintenance Procedure Scale Flush Procedure MO Approvals ATI 305 N GTS 305 N ATI 305 P GTS 305 P ATO 305 N GTS 305 N ATO 305 P GTS 305 P ATI 505 N GTS 505 N ATI 505 P GTS 505 P ATO 505 N GTS 505 N ATO 505 P GTS 505 P ATI 705 N GTS 705 N ATI 705 P GTS 705 P ATO 705 N GTS 705 NI GT 705 N ATO 705 P GTS 705 P GT 705 P ATI 705A N GTS 705 NIA AGT 705 NI ATI 705A P GTS 705 PIA AGT 705 PI ATO 705A N GTS 705 NEA AGT 705 NE ATO 705A P GTS 705 PEA AGT 705 PE GT 305 N GT 305 P GT 305 N GT 305 P GT 505 N GT 505 P GT 505 N GT 505 P GI 705 N GI 705 P HHA D i Di DI r DI Di Gi D Di D D o DI D The models listed in this manual have received the following certifications except where noted Caminan to apple DIS A LEEI Air Conditioning Heating and standards for appliances using gas or other petroleum fuel FAR mu al Refrigeration Institute standards for appliances using Commission CEC standards CEN A gas or other petroleum fuel Certified to applicable Canadian Met the Cali
13. PRINTED 0209 On Demand Water Heater System Design Manual Design information for single and multiple unit installations for residential commercial recircula tion and storage tank systems 186965 001 Table of Contents Water Quality and Gcale nn Pump Sizing for Circulation Tank Water Heaters in a Circulation Loop Additional Guidelnes Pump Sizing for Storage Tank Applications Pressure LOSS Curves EEN Domestic Hot Water Standard Installation 1 Water Heater H 1 ccccsscsseecsssscsceesesssesseesnsscesessessaneeeeenssaess 2 Water Heaters E EE 3 Water Heaters H 3 oooooococonocooccccnonoconoconcnnconocononennncnnnoncnncnnccnninnss 4 Water Heaters HA EEN 5 Water Heaters Holcim dictan 6 Water Heaters Heb hasta ana ao Domestic Hot Water with Optional Freeze Protection on Outdoor Models 1 Water Heater H7EN ENEE 2 Water Heaters H 2 E cc cccsscsccsseseeseseecsseccesesceeessnserssseenees 3 Water Heaters H 3 EN 6 Water Heaters H 6 E cccssscccccccssseeseesesssceseesesseneeeesssseeseees Domestic Hot Water with Circulation Systems 1 Water Heater Preferred H 1 RP ccccssssssssssseeeeeeeseesseees 1 Water Heater Optional H 71 PRO 2 Water Heaters Preferred H 2 2 Water Heaters Optional H 2 RO ooooocccccnccoccncconocnnccononnnonccononoss 3 Water Heaters Preferred H 3 6 Water Heaters Preferred H 6 RP ccecce
14. Water Backup Storage Circulation 3 On Demand Water Heaters Preferred Piping Installation Key 3 4 Ball Valve PNN Check Valve Y Pressure Regulator H Boiler Drain Valve 3 4 Union K Pressure Relief Valve A Circulating Pump Se Solenoid Valve Mixing Valve NOTE This drawing is not intended to describe a complete system and is not a replacement for a pro Drawing Date fessional engineering drawing It is intended only as a guide and does not imply compliance with local September 07 2008 building code requirements Confer with local building officials before installation The Contractor or engineer is to determine the necessary components and configuration of the particular system to be in Drawing Number stalled It is the responsibility of the engineer or contractor to ensure that the installation is in accordance H 3 TC with all local building codes On Demand Equipment List On Demand Water Heaters Building Hot Water Supply Line On Demand On Demand On Demand On Demand On Demand On Demand Water Heater Water Heater Water Heater Water Heater Water Heater Water Heater Set water heaters 20 F above storage tank Aquastat Storage Tank No Burner or Gas Supply Heating Element Submersible Aquastat Reference the section on set 20 F below On SS E AN Pump Sizing for Storage Demand Temperature Tank Application Setting 9 Cold Water Supply Line Pump Aquastat Control
15. Wire Expansion Tank Domestic Hot Water Backup Storage 6 On Demand Water Heaters Preferred Piping Installation Key id 3 4 Ball Valve IN Check Valve Y Pressure Regulator KX Boiler Drain Valve 3 4 Union K Pressure Relief Valve D Circulating Pump di Solenoid Valve Mixing Valve NOTE This drawing is not intended to describe a complete system and is not a replacement for a pro Drawing Date fessional engineering drawing It is intended only as a guide and does not imply compliance with local September 07 2008 building code requirements Confer with local building officials before installation The Contractor or engineer is to determine the necessary components and configuration of the particular system to be in Drawing Number stalled It is the responsibility of the engineer or contractor to ensure that the installation is in accordance H 6 T with all local building codes On Demand Equipment List QTY On Demand 6 Water Heaters Po ai Supply Line z On Demand On Demand On Demand On Demand On Demand On Demand Water Heater Water Heater a Water Heater Water Heater Water Heater Water Heater Expansion Tank Set water Heaters 20 above storage tank Aquastat e Ia Storage Tank Gas Supply IIA Pg gs Seog Y Sn No Burner or Heating Element Reference the section on Pump Sizing for Storage Tank Application Submersible Aquastat set 20 F below On D
16. actices NOTE Only use pumps of brass or stainless steel construction Do not use pumps of iron construction as they will oxidize and clog the inlet filter on the appliance Tank Water Heaters in a Circulation Loop The following applies when using a tank water heater gas or electric to provide heat for a circulation loop Drawing H 1 RP is an example Reference page 5 Step 1 on calculating heat loss Electric Tank Water Heater Since the input and output are the same for an electric tank water heater this can be expressed as Electric Tank Input Kw gt Circulation loop heat loss Btu h 3413 1 Kilowatt 3 413 BTU Gas Tank Water Heater When using a gas style water heater the efficiency of the tank must be taken into account Available Btu output Btu input of tank x efficiency gt Circulation loop heat loss Btu h Example 30 000 Btu input gas tank 0 62 Efficiency 30 000 x 62 18 600 available Btu output Additional Guidelines On demand water heaters not recovering a storage tank In applications involving a commercial dishwasher a hot water circulation loop feeding the dishwasher is required On demand water heater recovering a storage tank In applications involving a commercial dishwasher a hot water circulation loop feeding the dishwasher may be required depending on the distance between the dishwasher and the storage tank Refer to local codes when determining the need for circulation loops to dishwash
17. alve 3 4 Union K Pressure Relief Valve B Circulating Pump d Solenoid Valve Mixing Valve NOTE This drawing is not intended to describe a complete system and is not a replacement for a pro Drawing Date fessional engineering drawing It is intended only as a guide and does not imply compliance with local September 07 2008 building code requirements Confer with local building officials before installation The Contractor or engineer is to determine the necessary components and configuration of the particular system to be in Drawing Number stalled It is the responsibility of the engineer or contractor to ensure that the installation is in accordance H 2 RO with all local building codes For this application On Demand Pump should be controlled by an Aquastat Equipment List Timer or Combination Aquastat and Timer REN Pump to be sized to maintain circulation Water Heaters loop temperature The pump should be sized to overcome the pressure loss through the tank water heater Refer to On Demand Accessories and supply and return plumbing in the and Model Applicability for circulation loop Reference the section electronig connection detalis Pump Sizing for Circulation Pump to be of bronze or stainless construc tion Electronic Connection On Demand On Demand On Demand Water Heater Water Heater Water Heater D Primary Sub 1 Sub 2
18. and Water Heater Preferred Piping Installation Key D 3 4 Ball Valve PJ Check Valve Y Pressure Regulator KX Boiler Drain Valve 3 4 Union K Pressure Relief Valve D Circulating Pump d Solenoid Valve Mixing Valve NOTE This drawing is not intended to describe a complete system and is not a replacement for a pro Drawing Date fessional engineering drawing It is intended only as a guide and does not imply compliance with local September 07 2008 building code requirements Confer with local building officials before installation The Contractor or engineer is to determine the necessary components and configuration of the particular system to be in Drawing Number stalled It is the responsibility of the engineer or contractor to ensure that the installation is in accordance H 2 TC with all local building codes On Demand Equipment List On Demand Water Heaters On Demand Set water heaters 20 On Demand On Demand Water Heater above storage tank Aquastat Building Hot Water Water Heater Water Heater Supply Line a Storage Tank Gas Supply No Burner or Heating Element Submersible Aquastat set 20 F below On Reference the section on Demand Temperature gt Pump Sizing for Storage Tank Setting Application __ Pump Aquastat Control Wire Cold Water Supply Line Expansion Tank Domestic Hot Water Backup Storage 3 On Demand Water Heaters Prefer
19. c Hot Water Optional Freeze Protection 1 Outdoor On Demand Water Heater Preferred Piping Installation key I i 3 4 Ball Valve PN Check Valve Y Pressure Regulator FAS Boiler Drain Valve T 3 4 Union K Pressure Relief Valve O Circulating Pump di Solenoid Valve Go Mixing Valve NOTE This drawing is not intended to describe a complete system and is not a replacement for a pro Drawing Date fessional engineering drawing It is intended only as a guide and does not imply compliance with local September 07 2008 building code requirements Confer with local building officials before installation The Contractor or engineer is to determine the necessary components and configuration of the particular system to be in Drawing Number stalled It is the responsibility of the engineer or contractor to ensure that the installation is in accordance H Es 1 si E with all local building codes IMPORTANT With electrical power supplied to a on demand water heater it will not freeze in enviornments as cold as 30 F when protected from direct wind exposure In the event of a power failure at temperatures below freezing the water heater should be drained of all water to prevent freezing damage The unit may be drained manually or through the installation of the Optional solenoid valves as shown The electrical connections for the two solenoid valves should be tied to the 120 V power terminals provided on the PC Board of the water heate
20. eck Valve O 3 4 Ball Valve 3 4 Union Y Pressure Regulator K Pressure Relief Valve A Circulating Pump NOTE This drawing is not intended to describe a complete system and is not a replacement for a pro fessional engineering drawing It is intended only as a guide and does not imply compliance with local building code requirements Confer with local building officials before installation The Contractor or engineer is to determine the necessary components and configuration of the particular system to be in stalled It is the responsibility of the engineer or contractor to ensure that the installation is in accordance with all local building codes HA Boiler Drain Valve o Mixing Valve September 07 2008 H 2 E Drawing Date Drawing Number IMPORTANT With electrical power supplied to a on demand water heater it will not freeze in enviornments as cold as 30 F On Demand when protected from direct wind exposure Equipment List In the event of a power failure at temperatures below freezing the water heater should be drained of all water to On Demand Outdoor prevent freezing damage Water Heaters The unit may be drained manually or through the installation of the Optional solenoid valves as shown The electrical connections for the two solenoid valves should be tied to the 120V power terminals provided on the Electronic Connection PC Board of th ter heater Ee Refer to On Demand Accessories When
21. eded to protect the on demand water heaters and water heating systems from scale Water analysis shows whether water is hard or soft Hard water unless treated will cause scaling or liming of the heat exchanger The rate of scaling increases with temperature and usage because calcium carbonate and other scaling compounds lose solubility fall out of solution at higher temperatures For example for every 20 F over 140 F the rate of scale increases by a factor of 2 See figure below Reference target water quality levels found in the operation installation manual and consider water treatment if these levels are exceeded BASED ON 10 grains gal HARDNESS 210 e 180F 5 lt 170 F 2 150 S 160F E 120 D O TT H 90 gt F 1509 3 60 Ge 140F 120 F o g 9 a Y y Gi B e 5 s s s s s WATER USAGE gal day Figure 3 Source 2003 ASHRAE Handbook HVAC Applications Pump Sizing for Circulation 1 Use the chart below or one appropriate for your conditions to determine the heat loss in the length of the hot water supply and return piping For example 100 ft of 1 1 2 in bare copper tubing results in a heat loss of 5300 Btu h Approximate Heat Loss from Piping at 140 F Inlet 70 F Ambient 1 2 in Glass Fiber Insulated Btu h ft Copper Tubing Btu h ft Z o TS 0 A a l IN IET E Source 2003 ASHRAE Handbook HVAC Applications Table
22. emand Temperature Setting Cold Water Supply Line A Pump Aquastat Control Wire Expansion Tank Building Hot Water ASA Return Line Building Circulation Pump Domestic Hot Water Backup Storage Circulation 6 On Demand Water Heaters Preferred Piping Installation key DN 3 4 Ball Valve IN Check Valve Y Pressure Regulator H Boiler Drain Valve 3 4 Union K Pressure Relief Valve A Circulating Pump Se Solenoid Valve Go Mixing Valve NOTE This drawing is not intended to describe a complete system and is not a replacement for a pro Drawing Date fessional engineering drawing lt is intended only as a guide and does not imply compliance with local September 07 2008 building code requirements Confer with local building officials before installation The Contractor or engineer is to determine the necessary components and configuration of the particular system to be in Drawing Number stalled It is the responsibility of the engineer or contractor to ensure that the installation is in accordance H 6 TC with all local building codes Flush Procedure Disconnect electrical power to the water heater Close the shutoff valves on both the hot water and cold water lines V3 and V4 Connect pump outlet hose H1 to the cold water line at service valve V2 Connect drain hose H3 to service valve V1 Pour approximately 4 gallons of virgin food grade white vinegar or citric acid into pail
23. engineer is to determine the necessary components and configuration of the particular system to be in Drawing Number stalled It is the responsibility of the engineer or contractor to ensure that the installation is in accordance H 1 with all local building codes On Demand Equipment List On Demand Water Heaters Electronic Connection Refer to On Demand Accessories and Model Applicability for electronic connection details On Demand On Demand Water Heater Water Heater Primary Sub 1 i Ll z dE Cold Water Supply Line y d Hot Water Supply Line Lo Gas Supply Domestic Hot Water Standard Installation 2 On Demand Water Heaters Preferred Piping Installation Key O 3 4 Ball Valve PJ Check Valve Y Pressure Regulator HA Boiler Drain Valve 3 4 Union K Pressure Relief Valve 6 Circulating Pump Se Solenoid Valve Mixing Valve NOTE This drawing is not intended to describe a complete system and is not a replacement for a pro Drawing Date fessional engineering drawing It is intended only as a guide and does not imply compliance with local September 07 2008 building code requirements Confer with local building officials before installation The Contractor or engineer is to determine the necessary components and configuration of the particular system to be in Drawing Number stalled It is the responsibility of the engineer or contractor to ensure that the i
24. ers 10 Pump Sizing for Storage Tank Application The following applies when using on demand water heaters to recover a storage tank Drawing H 1 TC is an example On Demand water heaters have a pressure loss which must be considered in the system design Reference the pressure loss curve for the heater model being used to determine the pump size for the desired recovery rate For recommended pump sizes use the table below Additional pressure losses in plumbing between the Heater s and the storage tank must also be taken into consideration The specified pump size is to provide maximum recovery of the storage tank A smaller pump size may be used but could result in longer recovery time of the tank Please contact the Tech Services department with any questions on pump sizing NOTE Only use pumps of brass or stainless steel construction Do not use pumps of iron construction as they will oxidize and clog the inlet filter on the appliance Pump Flow Requirements Number of On Demand 705 505 305 Water Heaters 1 6 gom 30 head 5 gpm 25 head 2 12 gom O 30 head 10 gom O 25 head 3 18 gom O 30 head 15 gom O 25 head 4 24 gom O 30 head 20 gpm O 25 head 5 30 gpm 30 head 25 gpm 25 head 6 36 gpm 30 head 30 gpm 25 head 7 42 gpm 30 head 35 gpm 25 head 8 48 gom 30 head 40 gpm 25 head 9 54 gpm 30 head 45 gpm 25 head 10 60 gpm 30 head 50 gpm 25 head 11
25. etermine the necessary components and configuration of the particular system to be in Drawing Number stalled It is the responsibility of the engineer or contractor to ensure that the installation is in accordance M P 0 1 with all local building codes Notes 39 e 500 Tennessee Waltz Parkway Ashland TN 37015
26. fornia Energy St Approved by the Commonwealth d of Massachusetts G1 0208 249 Certified by the Uniform Plumbing Code UPC Received New York City s Material ie BP and Equipment Acceptance MEA Certified by National Sanitation MEA 327 02 E Vol 09 Foundation NSF www nsf org MEA 327 02 E Vol 10 indoor models must use the MEA 327 02 E Vol 11 NSF approved top guard L Water heaters are built in accordance with the requirements of the ASME Boiler ke and Pressure Vessel Code and received the Certificate of Authorization from the National Board The heat exchanger has the NB and the HLW stamps The California Safe Drinking Water and Toxic Enforcement Act requires the Governor of California to publish a list of substances known to the State of California to cause cancer birth defects or other repoductive harm and requires businesses to warn of potential exposure to such substances WARNING This product contains a chemical known to the State of California to cause cancer birth defects or other reproductive harm This appliance can cause low level exposure to some of the substances included in the Act Installation Consumer Information The on demand water heaters must be installed according to all local and state codes or in the absence of local and state codes the National Fuel Gas Code ANSI 2223 1 NFPA 54 current edition CSA American Inc National Fire Protection Association 8501 Ea
27. in an area Figure Er where leakage of the tank or connections will not DA result in damage to the area adjacent to the storage SN EE tank or to lower floors of the structure Due to the normal corrosive action of the water the tank will eventually leak after an extended period of time Also Storage Tank any external plumbing leak including those from Ban improper installation may cause early failure of the tank due to corrosion if not repaired If the owner operator is uncomfortable with making the repair a qualified technician should be contacted A suitable metal drain pan should be installed under the storage A suitable metal drain pan tank as shown below to help protect the property should be installed under from damage which may occur from condensate form the storage tank Uat dra ation or leaks in the piping connections or tank The pan must limit the water level to a maximum depth of oe 1 3 4 and be two inches wider than the tank and nar piped to an adequate drain NOTE The pan must not restrict combustion air flow Locate the storage tank near a suitable indoor drain Outside drains are subject to freezing temperatures which can obstruct At least 2 greater than the drain line The piping should be at least 3 4 ID thestorage tank and pitched for proper drainage Closed System Thermal Expansion H Di CAUTION PROPERTY DAMAGE HAZARD Figure 2 Hot Water In a closed system use a AAT expansion tank
28. ing is not intended to describe a complete system and is not a replacement for a pro fessional engineering drawing It is intended only as a guide and does not imply compliance with local building code requirements Confer with local building officials before installation The Contractor or engineer is to determine the necessary components and configuration of the particular system to be in Water Supply Line Install return line to the hot supply line as close as possible Building Supply to the on demand water heater Gas or Electric Tank Water Heater Expansion Tank Domestic Hot Water Circulation Systems 1 On Demand Water Heater with Gas or Electric Tank Preferred Piping Installation N Check Valve Y Pressure Regulator KX Boiler Drain Valve K Pressure Relief Valve D Circulating Pump di Solenoid Valve stalled It is the responsibility of the engineer or contractor to ensure that the installation is in accordance with all local building codes dr Mixing Valve Drawing Date September 07 2008 Drawing Number H 1 RP For this application On Demand Pump should be controlled by an Aquastat Equipment List__ QTY Timer or Combination Aquastat and Timer n Demana 1 Pump to be sized to maintain circulation Water Heater loop temperature The pump should be sized to overcome the pressure loss through the tank water heater and supply and return plumbing in the circulation loop Reference the section Pump Si
29. k Valve Y Pressure Regulator KX Boiler Drain Valve 3 4 Union K Pressure Relief Valve A Circulating Pump d Solenoid Valve Mixing Valve NOTE This drawing is not intended to describe a complete system and is not a replacement for a pro Drawing Date fessional engineering drawing It is intended only as a guide and does not imply compliance with local September 07 2008 building code requirements Confer with local building officials before installation The Contractor or engineer is to determine the necessary components and configuration of the particular system to be in Drawing Number stalled It is the responsibility of the engineer or contractor to ensure that the installation is in accordance H 2 T with all local building codes On Demand Equipment List QTY On Demand Commercial 2 Water Heaters TPA Set water heaters 20 F Building Hot Water On Demand On Demand g Water Heater Water Heater above storage tank Aquastat Supply Line T L SEN T Gas Supply Y Submersible Reference the section on 1 Pump Sizing for Storage Tank Application Se d g Storage Tank No Burner or Heating Element Aquastat set 20 F below On Demand Temperature Setting Pump Aquastat Control Wire Cold Water Supply Line Building Expansion Tank Circulation Pump Building Hot Water n gt L Return Line Domestic Hot Water Backup Storage Circulation 2 On Dem
30. nstallation is in accordance H 2 with all local building codes On Demand Equipment List On Demand Water Heaters Electronic Connection Refer to On Demand Accessories and Model Applicability for electronic connection details On Demand On Demand On Demand Water Heater Water Heater Water Heater Primary Sub 1 Sub 2 a A Gas Supply dt Cold Water Supply Line Hot Water Supply Line Domestic Hot Water Standard Installation 3 On Demand Water Heaters Preferred Piping Installation Key O 3 4 Ball Valve WY Check Valve Y Pressure Regulator HA Boiler Drain Valve 3 4 Union K Pressure Relief Valve A Circulating Pump dai Solenoid Valve Go Mixing Valve NOTE This drawing is not intended to describe a complete system and is not a replacement for a pro Drawing Date fessional engineering drawing It is intended only as a guide and does not imply compliance with local September 07 2008 building code requirements Confer with local building officials before installation The Contractor or engineer is to determine the necessary components and configuration of the particular system to be in Drawing Number stalled It is the responsibility of the engineer or contractor to ensure that the installation is in accordance H 3 with all local building codes Z g 5 On Demand On Demand Water Heater Water Heater Primary Sub 1 A L 1
31. ponents and configuration of the particular system to be in Drawing Number stalled It is the responsibility of the engineer or contractor to ensure that the installation is in accordance H 2 R D with all local building codes For this application On Demand Pump should be controlled by an Aquastat Equipment List___QTY Timer or Combination Aquastat and Timer dm Demand 2 Pump to be sized to maintain circulation Water Heaters loop temperature A minimum of 3 GPM flow is recommended for the circulation system Refer to On Demand Accessories 2 and Model Applicability for The pump should be sized to overcome the electronic sr ANER pressure loss through the on demand water heater optional storage tank and supply and return plumbing in the circulation loop Reference the section Pump Sizing for Circulation Pump to be of bronze or stainless construc tion On Demand On Demand Water Heater Water Heater Electronic Connection In EG o Primary Sub Gas Supply Line Minimum 3 4 Hot Water Supply Line Minimum 3 4 Cold Water Supply Line Optional 2 10 Gallon Storage Tank To eliminate cold water sandwich effect caused by fre quent On Off operation Expansion Tank Building Outlets Domestic Hot Water Circulation Systems 2 On Demand Water Heater Optional Piping Installation Key 3 4 Ball Valve TNN Check Valve Y Pressure Regulator HAI Boiler Drain V
32. r When the electrical power to the water heater fails the cold water supply solenoid valve closes stopping the flow of water into the heater and the drain down solenoid valve opens allowing the water heater and associated piping to drain Ensure that you run the drain for the solenoids per local codes NOTE Freeze protect all water pipes and fittings located outside building structure These are indicated by being above the dashed line All pipes and fittings shown below the dashed line should be located inside the building structure The vacuum breaker line should be located inside the building structure Hot Water Supply Line Outdoor On Demand Water Heater Primary 1 4 Normally Open Solenoid Valve Route drain per local codes On Demand Equipment List QTY On Demand Outdoor 2 Water Heaters Electronic Connection Refer to On Demand Accessories and Model Applicability for electronic connection details Outdoor On Demand Water Heater Sub 1 NOTE Pipes and fittings can be installed inside a pipe enclosure or recess box and packed with insulation for additional protection Gas Supply Line Normally Closed Solenoid Valve Full size of supply line Cold Water Supply Line a Domestic Hot Water Optional Freeze Protection 2 Outdoor On Demand Water Heaters Preferred Piping Installation Key WY Ch
33. r and associated piping to drain Ensure that you run the drain for the solenoids per local codes sa oe Pl A Outdoor Outdoor Outdoor Outdoor Outdoor On Demand On Demand On Demand On Demand On Demand Water Heater Water Heater Water Heater Water Heater Water Heater Vacuum Breaker Primary ub Sub 2 Primary On Demand Equipment List On Demand Outdoor Water Heaters Electronic Connection Refer to On Demand Accessories and Model Applicability for electronic connection details Outdoor On Demand Water Heater Sub 2 MESE SSC Es Pressure Regulator Set to 5 PSI Below Street Pressure Hot Water Supply NOTE 1 4 Minimum Freeze protect all water pipes and fittings located Normally Open outside building structure These are indicated Solenoid Valve by being above the dashed line All pipes and fittings shown below the dashed line should be located inside the building structure Route drain The vacuum breaker line should be located inside per local codes the building structure Domestic Hot Water Optional Freeze Protection 6 Outdoor On Demand Water Heater Preferred Piping Installation Key Gas Supply Line Pipes and fittings can be installed inside a pipe en closure or recess box and packed with insulation for additional protection NOTE Cold Water Supply Line Normally Closed Solenoid Valve Full Size of Cold Water Supply Line
34. re The pump should be sized to overcome the pressure loss through the tank water heater Refer to On Demand Accessories and supply and return plumbing in the and Model Applicability for circulation loop Reference the section electronic connecion detalls Pump Sizing for Circulation Pump to be of bronze or stainless construc tion Electronic Connection JS D m o On Demand On Demand Water Heater Water Heater Primary Sub tL a iat RS Gas Supply Line Minimum 3 4 Cold Water Supply Line Important Install return line to the hot supply line as close as possible Gas or Electric to the on demand water heater Tank Water Heater Minimum 3 4 Hot Building Supply Water Supply Line Expansion Tank Domestic Hot Water Circulation Systems 2 On Demand Water Heaters with Gas or Electric Tank Preferred Piping Installation Key 3 4 Ball Valve IN Check Valve Y Pressure Regulator FA Boiler Drain Valve 3 4 Union K Pressure Relief Valve A Circulating Pump d Solenoid Valve Mixing Valve NOTE This drawing is not intended to describe a complete system and is not a replacement for a pro Drawing Date fessional engineering drawing It is intended only as a guide and does not imply compliance with local September 07 2008 building code requirements Confer with local building officials before installation The Contractor or engineer is to determine the necessary com
35. red Piping Installation Key 3 4 Ball Valve TNN Check Valve Y Pressure Regulator H Boiler Drain Valve 3 4 Union K Pressure Relief Valve E Circulating Pump d Solenoid Valve Mixing Valve NOTE This drawing is not intended to describe a complete system and is not a replacement for a pro Drawing Date fessional engineering drawing It is intended only as a guide and does not imply compliance with local September 07 2008 building code requirements Confer with local building officials before installation The Contractor or engineer is to determine the necessary components and configuration of the particular system to be in Drawing Number stalled It is the responsibility of the engineer or contractor to ensure that the installation is in accordance H El 1 TC with all local building codes On Demand Equipment List QTY On Demand Commercial 2 Water Heaters Building Hot Water On Demand On Demand Set water heaters 20 F Water Heater Water Heater above storage tank Aquastat Supply Line Storage Tank Gas Supply No Burner or Heating Element Submersible s Ac Ne Reference the section 70 on Pump Sizing for On Demand Temperature EY EE Setting Storage Tank Application Pump Aquastat Control Wire Cold Water Supply Line Expansion Tank Domestic Hot Water Backup Storage 2 On Demand Water Heater Preferred Piping Installation Key O 3 4 Ball Valve NY Chec
36. red Piping Installation WY Check Valve Y Pressure Regulator FR Boiler Drain Valve Pressure Relief Valve 6 Circulating Pump di Solenoid Valve Mixing Valve 3 4 Union K NOTE This drawing is not intended to describe a complete system and is not a replacement for a pro Drawing Date fessional engineering drawing It is intended only as a guide and does not imply compliance with local September 07 2008 Key O 3 4 Ball Valve building code requirements Confer with local building officials before installation The Contractor or engineer is to determine the necessary components and configuration of the particular system to be in Drawing Number stalled It is the responsibility of the engineer or contractor to ensure that the installation is in accordance H 3 T with all local building codes On Demand Equipment List QTY On Demand 3 Water Heaters On Demand On Demand On Demand Set water heaters 20 F Building Hot Water Water Heater Water Heater Water Heater above storage tank Aquastat Supply Line Storage Tank Gas Supply No Burner or Heating Element Submersible Aquastat S set 20 F below On Reference the section on Demand Temperature Pump Sizing for Storage Tank Setting Application al Building Hot Water Return Line Pump Aquastat Control Wire Cold Water Supply Line Expansion Tank Building Circulation Pump Domestic Hot
37. s and temperatures a temperature and pressure relief valve must be installed in the opening on the on demand storage tank This valve must be design certified by a nationally recognized testing laboratory that maintains periodic inspection of the production of listed equipment or materials as meeting the requirements for Releif Valves for Hot Water Supply Systems ANSI Z21 22 The function of the temperature and pressure relief valve is to discharge water in large quantities in the event of excessive temperature or pressure developing in the water heater The valve s relief pressure must not exceed the working pressure of the water heater as stated on the data plate IMPORTANT Only a new temperature and pressure relief valve should be used with your water heater Do not use an old or existing valve as it may be damaged or not adequate for the working pressure of the new water heater Do not place any valve between the relief valve and the tank AWARNING Explosion Hazard If the temperature and pressure relief valve is dripping or leaking have a qualified service technician replace it Examples of a qualified service technician include Licensed plumbers authorized gas company personnel and authorized service personnel Do not plug valve Do not remove valve Failure to follow these instructions can result in death or explosion Water Quality and Scale A complete water analysis and an understanding of system requirements are ne
38. set at 120 F to reduce the risk of scald injury It is adjustable and can be reset to the desired temperature setting Some states have a requirement for a lower setting If you need hotter water follow directions for temperature adjustment but beware of the warnings in this section Site Location e Select a location near the center of the water piping system e Consider the exhaust vent system piping and combustion air supply requirements when selecting the water heater location The venting system must be able to run from the water heater to the termina tion with a minimal length and number of elbows e Locate the water heater near the existing gas piping If installing a new gas line locate the water heater to minimize the pipe length and elbows NOTE This water heater must be installed according to all local and state codes or in the absence of local and state codes the National Fuel Gas Code ANSI Z223 1 NFPA 54 current edition The water heater should be located in an area not subject to freezing temperatures Water heaters located in unconditioned spaces i e attics basements etc may require insulation of the water piping and drain piping to protect against freezing The drain and controls must be easily accessible for oper ation and service Maintain proper clearances as specified on the data plate For Storage Tank System Installation CAUTION PROPERTY DAMAGE HAZARD The storage tank should be located
39. st Pleasat Valley Road 1 Batterymarch Park Cleveland OH 44131 Quincy MA 02269 Check your phone listings for the local authorities having jurisdiction over your installation Consumer Responsibilities This manual has been prepared to acquaint you trained service technician with the installation oper ation and maintenance of the on demand water heater and provide important safety information in these areas Read all of the instructions thoroughly before attempting the installation or operation of the water heater Service to the on demand system should only be performed by a trained service technician Massachusetts code requires this water heater to be installed in accordance with Massachusetts Plumbing and Fuel Gas Code 248 CMR Section 2 00 and 5 00 Water Temperature Regulation For systems with storage tanks the water temperature in certain situation may vary up to 30 F 16 7 C higher or lower at the point of use such as bathtubs showers sink etc HOTTER WATER CAN SCALD Water heat ers are intended to produce hot water Water heated to a temperature which will satisfy space heating clothes washing dish wash ing and other sanitizing needs can scald and permanently injure you upon contact Some people are more likely to be permanently in Water temperature over 125 F can cause jured by hot water than others These include severe burns instantly or death from scalds the elderly children the infirm or physically
40. ter Heater Preferred Piping Installation Key O 3 4 Ball Valve PJ Check Valve Y Pressure Regulator HA Boiler Drain Valve 3 4 Union K Pressure Relief Valve A Circulating Pump Se Solenoid Valve Mixing Valve NOTE This drawing is not intended to describe a complete system and is not a replacement for a pro Drawing Date fessional engineering drawing It is intended only as a guide and does not imply compliance with local September 07 2008 building code requirements Confer with local building officials before installation The Contractor or engineer is to determine the necessary components and configuration of the particular system to be in Drawing Number stalled It is the responsibility of the engineer or contractor to ensure that the installation is in accordance H 1 T with all local building codes On Demand Equipment List QTY On Demand 1 Water Heater Building Hot Water On Demand Set 20 F above Supply Line Water Heater storage tank Aquastat Storage Tank Gas Supply No Burner or Heating Element Submersible Reference the section on Aquastat ny Pump Sizing for Storage Tank J set 20 F below On Demand Temperature Setting Application 21 Pump Aquastat Control Wire Cold Water Supply Line Expansion Tank Building Circulation Pump Building Hot Water On Return Line Domestic Hot Water Backup Storage Circulation 1 On Demand Water Heater Prefer
41. the electrical power to the water heater fails the cold water supply solenoid valve closes stopping the flow of and Model Applicability for water into the heater and the drain down solenoid valve opens allowing the water heater and associated piping to electronic connection details drain Ensure that you run the drain for the solenoids per local codes x Pon Fy SI Vacuum Breaker Outdoor Outdoor Outdoor On Demand On Demand On Demand Water Heater Water Heater Water Heater Primary Sub 1 Sub 2 NOTE Pipes and fittings can be installed inside a pipe enclosure or recess box and packed with insulation for additional protection Gas Supply Line Normally Closed Solenoid Valve Hot Water Full Size of Cold Water Supply Line Supply Line Je NOTE Cold Water Supply Line Freeze protect all water pipes and fittings located MENTA outside building structure These are indicated 1 4 Minimum by being above the dashed line y Normally Open Solenoid Valve All pipes and fittings shown below the dashed line should be located inside the building structure Route drain The vacuum breaker line should be located inside per local codes the building structure Domestic Hot Water Optional Freeze Protection 3 Outdoor On Demand Water Heater Preferred Piping Installation Key 3 4 Ball Valve TNN Check Valve Y Pressure Regulator HO Boiler Drain Valve 3
42. tion details On Demand On Demand On Demand On Demand On Demand Water Heater Water Heater Water Heater Water Heater Water Heater Primary Sub 1 Sub 2 Sub 3 Sub 4 D y J o i a d T t i er gt ta i L L T Gas Supply on es 2 eee ee a Cold Water Supply Line L EN LG 6 SE L LG T T Hot Water Supply Line Domestic Hot Water Standard Installation 5 On Demand Water Heaters Preferred Piping Installation Key 3 4 Ball Valve TNN Check Valve Y Pressure Regulator H Boiler Drain Valve 3 4 Union K Pressure Relief Valve A Circulating Pump Se Solenoid Valve Mixing Valve NOTE This drawing is not intended to describe a complete system and is not a replacement for a pro Drawing Date fessional engineering drawing It is intended only as a guide and does not imply compliance with local September 07 2008 building code requirements Confer with local building officials before installation The Contractor or engineer is to determine the necessary components and configuration of the particular system to be in Drawing Number stalled It is the responsibility of the engineer or contractor to ensure that the installation is in accordance H 5 with all local building codes On Demand Equipment List On Demand Water Heaters Electronic Connection Refer to On Demand Accessories and Model Applicability for elec
43. tronic connection details En pS Se en PA L Ar a 2 On z On Dad a ei Demand Water Water Heater Heater Primary Sub 1 Primary d Oo Pressure Regulator Set to 5 PSI Below Street Pressure A Gas Supply 4 Hot Water Supply Line dt Cold Water Supply Line Domestic Hot Water Standard Installation 6 On Demand Water Heaters Preferred Piping Installation Key 3 4 Ball Valve Ps Check Valve Y Pressure Regulator ER Boiler Drain Valve 3 4 Union K Pressure Relief Valve 6 Circulating Pump d Solenoid Valve Mixing Valve NOTE This drawing is not intended to describe a complete system and is not a replacement for a pro Drawing Date fessional engineering drawing It is intended only as a guide and does not imply compliance with local September 07 2008 building code requirements Confer with local building officials before installation The Contractor or engineer is to determine the necessary components and configuration of the particular system to be in Drawing Number stalled It is the responsibility of the engineer or contractor to ensure that the installation is in accordance H 6 with all local building codes IMPORTANT With electrical power supplied to a on demand water heater it will not freeze On Demand in enviornments as cold as 30 F when protected from direct wind exposure Equipment List In the event of a power failure at temperatures below
44. xpansion Tank Building Outlets Domestic Hot Water Circulation Systems 6 On Demand Water Heaters with Gas or Electric Tank Preferred Piping Installation mess Check Valve Y Pressure Regulator FA Boiler Drain Valve 3 4 Union K Pressure Relief Valve 6 Circulating Pump Sa Solenoid Valve Mixing Valve NOTE This drawing is not intended to describe a complete system and is not a replacement for a pro Drawing Date fessional engineering drawing It is intended only as a guide and does not imply compliance with local September 07 2008 Key O 3 4 Ball Valve building code requirements Confer with local building officials before installation The Contractor or engineer is to determine the necessary components and configuration of the particular system to be in Drawing Number stalled It is the responsibility of the engineer or contractor to ensure that the installation is in accordance H 6 R D with all local building codes On Demand Equipment List On Demand Water Heaters Building Hot Water On Demand Set 20 F above Supply Line Water Heater storage tank Aquastat Storage Tank No Burner or Gas Supply Heating Element Submersible Aquastat set 20 F below On Reference the section on Demand Temperature Pump Sizing for Storage Tank Setting E oer pplication Pump Aquastat Control Wire Cold Water Supply Line Expansion Tank Domestic Hot Water Backup Storage 1 On Demand Wa
45. zing for Circulation Pump to be of bronze or stainless construc tion On Demand Water Heater Gas Supply Minimum 3 4 Hot Water Supply Line Minimum 3 4 Cold Water Supply Line Optional 2 6 Gallon Storage Tank To eliminate cold water sandwich effect caused by Expansion Tank fre quent On Off operation Building Outlets Domestic Hot Water Circulation Systems 1 On Demand Water Heater Optional Piping Installation Key O 3 4 Ball Valve PJ Check Valve Y Pressure Regulator HA Boiler Drain Valve 3 4 Union K Pressure Relief Valve D Circulating Pump Se Solenoid Valve Mixing Valve NOTE This drawing is not intended to describe a complete system and is not a replacement for a pro Drawing Date fessional engineering drawing It is intended only as a guide and does not imply compliance with local September 07 2008 building code requirements Confer with local building officials before installation The Contractor or engineer is to determine the necessary components and configuration of the particular system to be in Drawing Number stalled It is the responsibility of the engineer or contractor to ensure that the installation is in accordance H 1 cb RO with all local building codes For this application On Demand Pump should be controlled by an Aquastat Equipment List__QTY Timer or Combination Aquastat and Timer cda S Pump to be sized to maintain circulation Water Heaters loop temperatu

A.O. Smith 186965-001 Water Heater User Manual

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