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

A.O. Smith Residential Power Vent Gas Water Heaters with Hot Surface Ignition Troubleshooting

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

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Troubleshooting

WARNING

This troubleshooting guide has been supplied for use by qualified service personnel who have a complete under- standing of both electricity and gas.

WARNING

Label all wiring before disconnecting any wiring; to ensure correct reconnection. Failure to follow this instruction could cause improper and possible danger- ous operation, resulting in DEATH, SERIOUS BODILY INJURY, OR PROPERTY DAMAGE.

THERMOSTAT AND GAS SUPPLY CHECK

Turn “ON” gas supply.

Is gas being supplied to the thermostat?

Yes

Is thermostat calling for heat? Run (hot) water from heater and set adjustment button higher. Check using a manometer at thermostat pressure tap.

Yes

Is there a minimum gas pressure 4″ W.C. for natural gas or 10″ W.C. for propane (L.P.) gas?

	Call gas company to increase
		No
	gas pressure.

Yes

GO TO SYSTEMS CHECK

SECTION, PAGE 36

Page 35

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A.O. Smith Residential Power Vent Gas Water Heaters with Hot Surface Ignition instruction manual Troubleshooting

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 Abbreviations Found In This Instruction Manual Preparing for the New InstallationIntroduction MANUAL BEFORE ATTEMPTING TO INSTALL OR OPERATE THE WATER HEATERSome models are equipped with circulating loop fittings Typical InstallationFacts to Consider About the Location Locating the New Water HeaterCombustion Air and Ventilation Locating the New Water Heater cont’dFacts to Consider About the Location cont’d Figure 3b Locating the New Water Heater cont’dVenting Through Roof - Clearances Figure 3ab. ALL AIR FROM OUTDOORS see Figures Locating the New Water Heater cont’dWater Piping Installing the New Water HeaterRELIEF VALVE OPENING Installing the New Water Heater cont’dTemperature-Pressure Relief Valve the temperature-pressure relief valve, and the discharge pipeOPTIONAL Field Installed Wiring WiringFilling the Water Heater Installing the New Water Heater cont’dWIRING DIAGRAM Wiring cont’dInstalling the New Water Heater cont’d OPTIONAL Field Installed Wiring cont’dSee rating plate for BTU/HR rating VentingInstalling the New Water Heater cont’d VENTING THROUGH AN OUTSIDE WALL4″ PVC, ABS or CPVC Schedule 40 vent piping Venting cont’dInstalling the New Water Heater cont’d VENTING THROUGH AN OUTSIDE WALL cont’dNOTE See pages 21 and 22 for vertical venting through a roof Installing the New Water Heater cont’dThe vent piping may be installed as follows VENTING SYSTEM EXAMPLE INSTALLATIONS FOR ALL MODELS40 AND 50 GALLON 40,000 BTU/HR MODELS 3″ VENT Installing the New Water Heater cont’dVenting cont’d VENTING THROUGH AN OUTSIDE WALL cont’dNUMBER OF Installing the New Water Heater cont’dCementing PVC, ABS or CPVC Pipe and Fittings 3″ DIA. VENTCONNECTING VENT TO BLOWER Installing the New Water Heater cont’dCUTTING OPENING THROUGH AN OUTSIDE WALL AND COLLAR INSTALLATION INSTALLATION SHOWING USE OF PVC, ABS OR CPVC PIPE4″ PVC, ABS or CPVC Schedule 40 vent piping Installing the New Water Heater cont’dVENTING THROUGH A ROOF ALL MODELS 3″ PVC, ABS or CPVC Schedule 40 vent piping3″ DIA. VENT Gas PipingInstalling the New Water Heater cont’d VENTING THROUGH A ROOF cont’dSEDIMENT TRAP Installing the New Water Heater cont’dGAS PIPING WITH FLEXIBLE CONNECTOR GAS PIPING WITH ALL BLACK IRON PIPE TO GAS CONTROLMODEL RATING PLATE Installation ChecklistInstalling the New Water Heater cont’d BEFORE OPERATING THE HEATEROPERATION OperatingBEFORE THE WATER HEATER WILL OPERATE 75 GALLON 70,000 AND 75,000 BTU/HRAN ODORANT IS ADDED TO THE GAS USED BY Operating cont’dTHIS WATER HEATER. FOR YOUR SAFETY IF YOU SMELL GAS Make sure gas and electric power are connected properlyOPERATING INSTRUCTIONS FOR YOUR SAFETY READ BEFORE OPERATINGWARNING TURN OFF ALL ELECTRIC POWER BEFORE SERVICING Operating cont’dTemperature Regulation Operational Conditions For Your InformationStart Up Conditions “AIR” IN HOT WATER FAUCET’S For Your Information cont’dVENTING MANUAL RESET SWITCH SMELLY WATER cont’dBurner Inspection Periodic MaintenanceBurner Cleaning Venting System InspectionAnode Rod Inspection Periodic Maintenance cont’dTemperature-Pressure Relief Valve Operation HousekeepingPeriodic Maintenance cont’d Drain Valve Washer ReplacementService Drainingfaucet before turning “ON” gas to the water heater Leakage CheckpointsTHERMOSTAT AND GAS SUPPLY CHECK TroubleshootingSYSTEMS CHECK Troubleshooting cont’dThermostat problems Troubleshooting cont’dPROBLEM SOLUTIONPVC, ABS or CPVC items for all models supplied locally Repair PartsBlower/Draft Hood Assembly for 40,000 Btu/Hr Models Only DESCRIPTION Repair Parts cont’dTHIS IS A REPAIR PARTS LIST, NOT A PACKING LIST PART