A.O. Smith On Demand 305 Series 100 Design Manual Download

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PRINTED 0209 186965-001

Design information for single and multiple unit
installations for residential, commercial, recircula-
tion and storage tank systems.

On-Demand Water Heater

System Design Manual

Summary of Contents for On Demand 305 Series 100

Page 1: ...PRINTED 0209 186965 001 Design information for single and multiple unit installations for residential commercial recircula tion and storage tank systems On Demand Water Heater System Design Manual...

Page 2: ...culation Systems 1 Water Heater Preferred H 1 Water Heater Optional H 1 RO 2 Water Heaters Preferred H 2 RP 2 Water Heaters Optional H 3 Water Heaters Preferred H 3 RP 6 Water Heaters Preferred H 6 RP...

Page 3: ...505 PI GT 505 PI ATO 505 N GTS 505 NE GT 505 NE ATO 505 P GTS 505 PE GT 505 PE ATI 705 N GTS 705 NI GT 705 NI ATI 705 P GTS 705 PI GT 705 PI ATO 705 N GTS 705 NE GT 705 NE ATO 705 P GTS 705 PE GT 705...

Page 4: ...rdance 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...

Page 5: ...the warnings in this section Site Location Select a location near the center of the water piping system Consider the exhaust vent system piping and combustion air supply requirements when selecting t...

Page 6: ...osive action of the water the tank will eventually leak after an extended period of time Also any external plumbing leak including those from improper installation may cause early failure of the tank...

Page 7: ...ter 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 wi...

Page 8: ...se 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 figu...

Page 9: ...oss through Tank water heater reference manufacturer s information All building supply and return plumbing in the circulation loop reference local plumbling codes standards or practices B Optional Met...

Page 10: ...sing a gas style water heater the efficiency of the tank must be taken into account Available Btu output Btu input of tank x efficiency Circulation loop heat loss Btu h Example 30 000 Btu input gas ta...

Page 11: ...nk 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...

Page 12: ...Loss psi Water Flow gpm 0 0 5 0 10 0 15 0 20 0 25 0 30 0 35 0 40 0 45 0 0 1 2 3 4 5 6 7 8 9 10 11 0 0 10 0 20 0 30 0 40 0 50 0 60 0 Pressure Loss ft head 305i 505 305e Figure 4 Pressure Loss Curves 10...

Page 13: ...3 Pressure Loss psi Water Flow gpm Pressure Loss ft head Figure 5 0 5 10 15 20 25 30 35 40 45 0 1 2 3 4 5 6 7 8 9 10 11 0 10 20 30 40 50 60 70 80 90 100 705 505 305 Pressure Loss Curves 200 201 Series...

Page 14: ...uilding 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 en...

Page 15: ...o 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...

Page 16: ...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...

Page 17: ...o 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 Contract...

Page 18: ...figuration 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 18 On Demand...

Page 19: ...in stalled It is the responsibility of the engineer or contractor to ensure that the installation is in accordance with all local building codes 19 Sub 1 Sub 2 Primary Sub 1 Sub 2 On Demand Equipment...

Page 20: ...ater NOTE outside building structure These are indicated by being above the dashed line line should be located inside the building structure The vacuum breaker line should be located inside the buildi...

Page 21: ...aters Electronic Connection Refer to On Demand Accessories and Model Applicability for electronic connection details NOTE Pipes and fittings can be installed inside a pipe enclosure or recess box and...

Page 22: ...Supply Line Outdoor On Demand Water Heater Route drain per local codes On Demand Equipment List QTY On Demand Outdoor 3 Water Heaters Electronic Connection Refer to On Demand Accessories and Model Ap...

Page 23: ...onal 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 t...

Page 24: ...Demand Water Heater with Gas or Electric Tank Preferred Piping Installation Expansion Tank Minimum 3 4 Cold Water Supply Line Minimum 3 4 Hot Water Supply Line Building Supply Gas Supply Line On Dema...

Page 25: ...rculationSystems 1 On Demand Water Heater Optional Piping Installation For this application Pump should be controlled by an Aquastat Timer or Combination Aquastat and Timer Pump to be sized to maintai...

Page 26: ...ion 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...

Page 27: ...and Model Applicability for electronic connection details Gas Supply Line On Demand Water Heater Primary On Demand Water Heater Sub 1 Optional 2 10 Gallon Storage Tank To eliminate cold water sandwic...

Page 28: ...tat 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 circu...

Page 29: ...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 b...

Page 30: ...or to ensure that the installation is in accordance with all local building codes 30 On Demand Equipment List QTY On Demand 1 Water Heaters Domestic Hot Water Backup Storage 1 On Demand Water Heater P...

Page 31: ...n is in accordance with all local building codes 31 On Demand Equipment List QTY On Demand 1 Water Heater Domestic Hot Water Backup Storage Circulation 1 On Demand Water Heater Preferred Piping Instal...

Page 32: ...stallation is in accordance with all local building codes 32 On Demand Equipment List QTY On Demand Commercial 2 Water Heaters Domestic Hot Water Backup Storage 2 On Demand Water Heater Preferred Pipi...

Page 33: ...ll local building codes 33 On Demand Equipment List QTY On Demand Commercial 2 Water Heaters Domestic Hot Water Backup Storage Circulation 2 On Demand Water Heater Preferred Piping Installation On Dem...

Page 34: ...tion is in accordance with all local building codes 34 On Demand Equipment List QTY On Demand 3 Water Heaters Domestic Hot Water Backup Storage 3 On Demand Water Heaters Preferred Piping Installation...

Page 35: ...al building codes 35 On Demand Equipment List QTY On Demand 3 Water Heaters Domestic Hot Water Backup Storage Circulation 3 On Demand Water Heaters Preferred Piping Installation On Demand Water Heater...

Page 36: ...l building codes 36 On Demand Equipment List QTY On Demand 6 Water Heaters Domestic Hot Water Backup Storage 6 On Demand Water Heaters Preferred Piping Installation Storage Tank No Burner or Heating E...

Page 37: ...uipment List QTY On Demand 6 Water Heaters Domestic Hot Water Backup Storage Circulation 6 On Demand Water Heaters Preferred Piping Installation Storage Tank No Burner or Heating Element Submersible A...

Page 38: ...e Hot Wa ter Line In l n i e F ilter Flush Procedure 1 Disconnect electrical power to the water heater and V4 3 Connect pump outlet hose H1 to the cold water line at service valve V2 4 Connect drain h...

Page 39: ...39 Notes...

Page 40: ...500 Tennessee Waltz Parkway Ashland TN 37015...

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