A.O. Smith HWG-140, Instruction Manual

Page 1: ...ture reference HOT WATER GENERATING SYSTEMS Thank you for buying this water heater We appreciate your confidence in our products VERTICAL AND HORIZONTAL MODELS HWG 140 THRU HWG 1000 INSTALLATION OPERA...

Page 2: ...about the type of hazard what can happen if you do not follow the safety message and how to avoid the risk of injury The California Safe Drinking Water and Toxic Enforcement Act requires the Governor...

Page 3: ...perly may also cause erratic control system operation on ELECTRONIC CONTROL models This water heater must be connected to a grounded metal permanent wiring system or an equipment grounding conductor m...

Page 4: ...incipal components of the heater are identified on page 6 The model and rating plate on page 7 interprets certain markings into useful information Both of these references should be used to identify t...

Page 5: ...5 FEATURES COMPONENTS AND DIMENSIONS...

Page 6: ...6 TYPICAL WATER HEATER TRIM FIGURE 3 TYPICAL STEAM TO WATER PIPING FIGURE 4 TYPICAL WATER TO WATER 3 WAY PIPING...

Page 7: ...ampering Whether replacing an old water heater or putting the water heater in a new location the following critical points should be observed The water heater should be located 1 On a level surface Sh...

Page 8: ...ef valve and the tank Do not connect discharge piping directly to the drain unless a 6 15 2 cm air gap is provided To prevent bodily injury hazard to life or property damage the relief valve must be a...

Page 9: ...ease see attached wiring diagrams for appropriate wiring and connections thermal expansion As water is heated it expands thermal expansion In a closed system the volume of water will grow when it is h...

Page 10: ...10 WIRING DIAGRAMS WIRING DIAGRAMS WIRING DIAGRAM ELECTRONICALLY ACTUATED CONTROL VALVE FIGURE 5 WIRING DIAGRAM SELF ACTUATED CONTROL VALVE FIGURE 6...

Page 11: ...nce this type of use you should consider using lower temperature settings to reduce scald hazards HOT WATER CAN SCALD Water heaters are intended to produce hot water Water heated to a temperature whic...

Page 12: ...ater system the storage water heater acts as a settling basin for any foreign matter in the water which will deposit itself on the bottom of the storage section For this reason it is recommended to dr...

Page 13: ...tage and leaking or open hot water faucets Sediment or lime scale may be affecting water heater operation Refer to MAINTENANCE for details Water is too hot Refer to TEMPERATURE REGULATION Water leakag...

Page 14: ...storage Steam control valve out of calibration Adjust as necessary Valve may not close all the way due to loss of charge in thermostatic bulb ruptured bulb Check bulb and contact manufacturer of same...

Page 15: ...only a replacement water heater or part thereof The owner is responsible for all other costs Such costs may include but are not limited to a Labor charges for service removal repair or reinstallation...

Page 16: ...16 NOTES...

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Page 18: ...18 NOTES...

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Page 20: ...A DIVISION OF A O SMITH CORPORATION RENTON WASHINGTON Technical Support 800 527 1953 Parts Department 800 433 2515 www hotwater com...