A.O. Smith GAHH-50, GAHH-40, 315456-002 installation instructions Fire or Explosion Hazard

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Fire or Explosion Hazard

Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.

Avoid all ignition sources if you smell Natural or LP gas.

Do not expose water heater control to excessive gas pressure.

Use only gas shown on rating plate.

Maintain required clearances to combustibles.

Keep ignition sources away from faucets after extended period of non-use.

Read instruction manual before

installing, using or servicing

water heater.

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Contents Residential GAS Water Heaters Table of Contents Safe INSTALLATION, USE and Service Safety PrecautionsFire or Explosion Hazard Typical Installation GET to Know Your Water Heater GAS ModelsInstalling Your GAS Water Heater Unpacking the Water Heater Excessive Weight HazardImportant Information About This Water Heater Consumer InformationSite Location Location RequirementsCarbon Monoxide Poisoning Hazard Clearances and Accessibility State of CaliforniaGas Pressure Testing GAS SupplyGas Requirements Gas PipingGas Pipe Capacity Table Combustion AIR & Ventilation Unconfined SpaceConfined Space Minimum Btuh InputAll Air from Outdoors All Air from Inside the BuildingLouvers and Grilles Draft Hood Installation Vent Pipe SystemVent Connectors Vent Pipe SizeChimney Connection Vertical Exhaust Gas VentPiping Installation Water System PipingTemperature and Pressure Relief Valve Closed System/Thermal ExpansionTemperature & Pressure Relief Valve Relief Valve and Pipe InsulationCombination Space Heating/Potable Water System Discharge LineWiring Diagram Solar InstallationElectrical Connections Installation Checklist Important Information about this Water HeaterOperating Your Water Heater Operating InstructionsChecking the Draft Water Heater OperationBurn Hazard Burner Flames Water Temperature RegulationEmergency Shut Down Safety Shut-off Operational ConditionsCondensation Water Heater SoundsPowered Anode Operation Routine Preventive MaintenanceDraining and Flushing Maintenance of Your Water Heater Replacement PartsRemoving the Manifold/Burner Assembly Removing the Burner from the Manifold/ Burner AssemblyCleaning the Combustion Chamber and Air Diverter Assembly Replacing the Flame Sense/Hot Surface igniter AssemblyReplacing the Manifold/Burner Assembly Removing the Gas Control Valve/Thermostat Removing and Replacing the Gas Control Valve/ThermostatReplacing the Gas Valve Pressurized Combustion Chamber System Operational Checklist Troubleshooting ChartCont Control Display Troubleshooting Control Display Status Problem SolutionControl Display Status Problem Solution FV-SENSE and Open Flashing Troubleshooting Flowchart YESRepair Parts List Repair Parts IllustrationListed Parts Kits and Illustrations Page Page Page Limited Residential GAS Warranty YearImportant Information