Manuals / A.O. Smith / Household Appliance / Water Heater

A.O. Smith Residential Power Vent Gas Water Heaters with Hot Surface Ignition Wiring cont’d

Models: Residential Power Vent Gas Water Heaters with Hot Surface Ignition

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Installing the New Water Heater (cont’d)

Wiring (cont’d)

OPTIONAL Field Installed Wiring (cont’d)

5.The water heater must be electrically “grounded” by the installer. A green ground screw has been provided on the water heaters junction box. Connect ground wire to this location. For complete grounding details and all allowable exceptions, refer to local codes or in the absence of local codes, with the National Electrical Code, ANSI/NFPA 70 (current edition).

6.Replace the wiring junction cover using the screw provided.

WIRING DIAGRAM

WIRE NUTS

CONDUIT

GREEN

GROUND SCREW

CAUTION

Label all wires prior to disconnection when servicing con- trols. Wiring errors can cause improper and dangerous operation. Verify proper operation after servicing.

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A.O. Smith Residential Power Vent Gas Water Heaters with Hot Surface Ignition Wiring cont’d, Wiring Diagram

Contents

NOT FOR USE IN MANUFACTURED MOBILE HOMES Must not be plugged or blocked General SafetyThe Discharge Pipe ILY INJURY, OR PROPERTY DAMAGE General Safety cont’da. DO NOT cover the temperature-pressure relief valve Table of Contents MANUAL BEFORE ATTEMPTING TO INSTALL OR OPERATE THE WATER HEATER Preparing for the New InstallationIntroduction Abbreviations Found In This Instruction ManualTypical Installation Some models are equipped with circulating loop fittingsLocating the New Water Heater Facts to Consider About the LocationCombustion Air and Ventilation Locating the New Water Heater cont’dFacts to Consider About the Location cont’d Figure 3a Locating the New Water Heater cont’dVenting Through Roof - Clearances Figure 3bLocating the New Water Heater cont’d b. ALL AIR FROM OUTDOORS see FiguresInstalling the New Water Heater Water Pipingthe temperature-pressure relief valve, and the discharge pipe Installing the New Water Heater cont’dTemperature-Pressure Relief Valve RELIEF VALVE OPENINGInstalling the New Water Heater cont’d WiringFilling the Water Heater OPTIONAL Field Installed WiringOPTIONAL Field Installed Wiring cont’d Wiring cont’dInstalling the New Water Heater cont’d WIRING DIAGRAMVENTING THROUGH AN OUTSIDE WALL VentingInstalling the New Water Heater cont’d See rating plate for BTU/HR ratingVENTING THROUGH AN OUTSIDE WALL cont’d Venting cont’dInstalling the New Water Heater cont’d 4″ PVC, ABS or CPVC Schedule 40 vent pipingVENTING SYSTEM EXAMPLE INSTALLATIONS FOR ALL MODELS Installing the New Water Heater cont’dThe vent piping may be installed as follows NOTE See pages 21 and 22 for vertical venting through a roofVENTING THROUGH AN OUTSIDE WALL cont’d Installing the New Water Heater cont’dVenting cont’d 40 AND 50 GALLON 40,000 BTU/HR MODELS 3″ VENT3″ DIA. VENT Installing the New Water Heater cont’dCementing PVC, ABS or CPVC Pipe and Fittings NUMBER OFINSTALLATION SHOWING USE OF PVC, ABS OR CPVC PIPE Installing the New Water Heater cont’dCUTTING OPENING THROUGH AN OUTSIDE WALL AND COLLAR INSTALLATION CONNECTING VENT TO BLOWER3″ PVC, ABS or CPVC Schedule 40 vent piping Installing the New Water Heater cont’dVENTING THROUGH A ROOF ALL MODELS 4″ PVC, ABS or CPVC Schedule 40 vent pipingVENTING THROUGH A ROOF cont’d Gas PipingInstalling the New Water Heater cont’d 3″ DIA. VENTGAS PIPING WITH ALL BLACK IRON PIPE TO GAS CONTROL Installing the New Water Heater cont’dGAS PIPING WITH FLEXIBLE CONNECTOR SEDIMENT TRAPBEFORE OPERATING THE HEATER Installation ChecklistInstalling the New Water Heater cont’d MODEL RATING PLATE75 GALLON 70,000 AND 75,000 BTU/HR OperatingBEFORE THE WATER HEATER WILL OPERATE OPERATIONMake sure gas and electric power are connected properly Operating cont’dTHIS WATER HEATER. FOR YOUR SAFETY IF YOU SMELL GAS AN ODORANT IS ADDED TO THE GAS USED BYOperating cont’d FOR YOUR SAFETY READ BEFORE OPERATINGWARNING TURN OFF ALL ELECTRIC POWER BEFORE SERVICING OPERATING INSTRUCTIONSTemperature Regulation Operational Conditions For Your InformationStart Up Conditions SMELLY WATER cont’d For Your Information cont’dVENTING MANUAL RESET SWITCH “AIR” IN HOT WATER FAUCET’SVenting System Inspection Periodic MaintenanceBurner Cleaning Burner InspectionHousekeeping Periodic Maintenance cont’dTemperature-Pressure Relief Valve Operation Anode Rod InspectionDraining Drain Valve Washer ReplacementService Periodic Maintenance cont’dLeakage Checkpoints faucet before turning “ON” gas to the water heaterTroubleshooting THERMOSTAT AND GAS SUPPLY CHECKTroubleshooting cont’d SYSTEMS CHECKSOLUTION Troubleshooting cont’dPROBLEM Thermostat problemsPVC, ABS or CPVC items for all models supplied locally Repair PartsBlower/Draft Hood Assembly for 40,000 Btu/Hr Models Only PART Repair Parts cont’dTHIS IS A REPAIR PARTS LIST, NOT A PACKING LIST DESCRIPTION