A.O. Smith GAHH-40, GAHH-50, 315456-002 Safe INSTALLATION, USE and Service, Safety Precautions

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SAFE INSTALLATION, USE AND SERVICE

Your safety and the safety of others is extremely important in the installation, use and servicing of this water heater.

Many safety-related messages and instructions have been provided in this manual and on your water heater to warn you and others of a potential hazard. Read and obey all safety messages and instructions throughout this manual. It is very important that the meaning of each safety message is understood by you and others who install, use or service this water heater.

This is the safety alert symbol. It is used to alert you to potential personal injury hazards. Obey all safety messages that follow this symbol to avoid possible injury or death.

DANGER

 

result in death or injury.

 

 

DANGER indicates an imminently hazardous situation which, if not avoided, will

 

 

 

 

 

result in death or injury.

WARNING

 

 

WARNING indicates a potentially hazardous situation which, if not avoided, could

 

 

 

CAUTION

 

result in minor or moderate injury.

 

 

CAUTION indicates a potentially hazardous situation which, if not avoided, could

 

 

 

CAUTION

 

situation which, if not avoided, could result in property damage

 

 

CAUTION used without the safety alert symbol indicates a potentially hazardous

 

 

 

All safety messages will generally tell you 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 of California to publish a list of substances known to the State of California to cause cancer, birth defects, or other reproductive harm, and requires businesses to warn of potential exposure to such substances.

WARNING: This product contains a chemical known to the State of California to cause cancer, birth defects, or other reproductive harm.

This appliance can cause low-level exposure to some of the substances included in the Act.

IMPORTANT DEFINITIONS

Qualified Technician: A qualified technician must have ability equivalent to a licensed tradesman in the fields of plumbing, air supply, venting, and gas supply, including a thorough understanding of the requirements of the National Fuel Gas Code as it relates to the installation of gas fired water heaters. The qualified technician must also be familiar with the design features and use of flammable vapor ignition resistant water heaters, and have a thorough understanding of this instruction manual.

Service Agency: A service agency also must have ability equivalent to a licensed tradesman in the fields of plumbing, air supply, venting and gas supply, including a thorough understanding of the requirements of the National Fuel Gas Code as it relates to the installation of gas fired water heaters. The service agency must also have a thorough understanding of this instruction manual, and be able to perform repairs strictly in accordance with the service guidelines provided by the manufacturer.

Gas Supplier: The Natural Gas or Propane Utility or service who supplies gas for utilization by the gas burning appliances within this application. The gas supplier typically has responsibility for the inspection and code approval of gas piping up to and including the Natural Gas meter or Propane storage tank of a building. Many gas suppliers also offer service and inspection of appliances within the building.

SAFETY PRECAUTIONS

FLAMMABLES

Flammable Vapors

WARNING

FIRE AND EXPLOSION HAZARD

Can result in serious injury or death

Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. Storage of or use of gasoline or other flammable vapors or liquids in the vicinity of this or any other appliance can result in serious injury or death.

Read and follow water heater warnings and instructions.

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Contents Residential GAS Water Heaters Table of Contents Safety Precautions Safe INSTALLATION, USE and ServiceFire or Explosion Hazard GET to Know Your Water Heater GAS Models Typical InstallationConsumer Information Installing Your GAS Water HeaterUnpacking the Water Heater Excessive Weight Hazard Important Information About This Water HeaterLocation Requirements Site LocationCarbon Monoxide Poisoning Hazard State of California Clearances and AccessibilityGas Piping Gas Pressure TestingGAS Supply Gas RequirementsGas Pipe Capacity Table Minimum Btuh Input Combustion AIR & VentilationUnconfined Space Confined SpaceAll Air from Inside the Building All Air from OutdoorsLouvers and Grilles Vent Pipe System Draft Hood InstallationVertical Exhaust Gas Vent Vent ConnectorsVent Pipe Size Chimney ConnectionWater System Piping Piping InstallationClosed System/Thermal Expansion Temperature and Pressure Relief ValveDischarge Line Temperature & Pressure Relief ValveRelief Valve and Pipe Insulation Combination Space Heating/Potable Water SystemSolar Installation Wiring DiagramElectrical Connections Important Information about this Water Heater Installation ChecklistOperating Instructions Operating Your Water HeaterWater Heater Operation Checking the DraftBurn Hazard Water Temperature Regulation Burner FlamesEmergency Shut Down Water Heater Sounds Safety Shut-offOperational Conditions CondensationRoutine Preventive Maintenance Powered Anode OperationDraining and Flushing Removing the Burner from the Manifold/ Burner Assembly Maintenance of Your Water HeaterReplacement Parts Removing the Manifold/Burner AssemblyReplacing the Flame Sense/Hot Surface igniter Assembly Cleaning the Combustion Chamber and Air Diverter AssemblyReplacing the Manifold/Burner Assembly Removing and Replacing the Gas Control Valve/Thermostat Removing the Gas Control Valve/ThermostatReplacing the Gas Valve Troubleshooting Chart Pressurized Combustion Chamber System Operational ChecklistCont Control Display Status Problem Solution Control Display TroubleshootingControl Display Status Problem Solution FV-SENSE and Open Flashing YES Troubleshooting FlowchartRepair Parts Illustration Repair Parts ListListed Parts Kits and Illustrations Page Page Page Year Limited Residential GAS WarrantyImportant Information