American Water Heater ABCG3 instruction manual Unconfined Space, Confined Space, Venting

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Never obstruct the flow of ventilation air. If you have any doubts or questions at all, call your gas supplier. Failure to provide the proper amount of combustion air can result in a fire or explosion and cause property damage, serious bodily injury or death.

Unconfined Space

An Unconfined Space is one whose volume IS NOT LESS THAN 50 cubic feet per 1,000 Btu/hr (4.8 cubic meters per kW) of the total input rating of all appliances installed in the space. Rooms communicating directly with the space, in which the appliances are installed, through openings not furnished with doors, are considered a part of the unconfined space.

Makeup air requirements for the operation of exhaust fans, kitchen ventilation systems, clothes dryers and fireplaces shall also be considered in determining the adequacy of a space to provide combustion, ventilation and dilution air.

Unusually Tight Construction

In unconfined spaces in buildings, infiltration may be adequate to provide air for combustion, ventilation and dilution of flue gases. However, in buildings of unusually tight construction (for example, weather stripping, heavily insulated, caulked, vapor barrier, etc.) additional air must be provided using the methods described in the Confined Space section that follows.

Confined Space

A Confined Space is one whose volume IS LESS THAN 50 cubic feet per 1,000 Btu/hr (4.8 cubic meters per kW) of the total input rating of all appliances installed in the space.

Openings must be installed to provide fresh air for combustion, ventilation and dilution in confined spaces. The required size for the openings is dependent on the method used to provide fresh air to the confined space AND the total Btu/hr input rating of all appliances installed in the space.

Exhaust Fans

Where exhaust fans are installed, additional air shall be provided to replace the exhausted air. When an exhaust fan is installed in the same space with a water heater, sufficient openings to provide fresh air must be provided that accommodate the requirements for all appliances in the room and the exhaust fan. Undersized openings will cause air to be drawn into the room through the water heater’s vent system causing poor combustion. Sooting, serious damage to the water heater and the risk of fire or explosion may result. It can also create a risk of asphyxiation.

Louvers and Grilles

The free areas of the fresh air openings in the instructions that follow do not take in to account the presence of louvers, grilles or screens in the openings.

The required size of openings for combustion, ventilation and dilution air shall be based on the “net free area” of each opening. Where the free area through a design of louver or grille or screen is known, it shall be used in calculating the size of opening required to provide the free area specified. Where the louver and grille design and free area are not known, it shall be assumed that wood louvers will have 25% free area and metal louvers and grilles will have 75% free area. Non motorized louvers and grilles shall be fixed in the open position.

VENTING INSTALLATION

Venting

THE INSTRUCTIONS IN THIS SECTION ON VENTING MUST BE FOLLOWED TO AVOID CHOKED COMBUSTION OR RECIRCULATION OF FLUE GASES. SUCH CONDITIONS CAUSE SOOTING OR RISKS OF FIRE AND ASPHYXIATION.

Heater must be protected from freezing downdrafts.

Remove all soot or other obstructions from the chimney that will retard a free draft.

Type B venting is required with these heaters. For typical venting application see TECHNICAL DATA VENTING on pages 18 and 19.

This water heater must be vented in compliance with all local codes, the current revision of the National Fuel Gas Code (ANSI-Z223.1) and with the Category I Venting Tables.

If any part of the vent system are exposed to ambient temperatures below 40°F it must be insulated to prevent condensation.

Do not connect the heater to a common vent or chimney with solid fuel burning equipment. This practice is prohibited by many local building codes as is the practice of venting gas fired equipment to the duct work of ventilation systems.

figure 11.

figure 12.

Where a separate vent connection is not available and the vent pipe from the heater must be connected to a common vent with an oil burning furnace, the vent pipe should enter the smaller common vent or chimney at a point above the large vent pipe.

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Contents Commercial gas water heaters Table Of Contents Approvals Safe Installation, Use and ServiceFire and Explosion Hazard General Safety InformationGrounding Instructions Precautions Hydrogen Gas FlammableQualifications Qualified Installer or Service AgencyIntroduction Abbreviations UsedElectronic Ignition Control Eliminator self-cleaning systemHigh Limit Switch Low Gas Pressure SwitchRecovery CAPACITIES, based on 80% efficiency Installation considerationsRough In Dimensions ROUGH-IN-DIMENSIONSClearances Locating the Water HeaterInstallation on Combustible Flooring Insulation BlanketCirculation pumps High Altitude Installations Installation Requirements Thermal Expansion Temperature-Pressure Relief ValveDishwashing Machines Closed Water SystemsContaminated Air Air RequirementsValve Discharge Pipe Requirements Unconfined Space Confined SpaceVenting Outdoor Air Through One Opening Multiple Heater ManifoldFresh Air Openings for Confined Spaces Outdoor Air Through Two OpeningsAir From Other Indoor Spaces Outdoor Air Through Two Vertical DuctsMultiple Gas Fired Tank-Type Heaters Technical Data VentingTechnical Data Venting Water heater installation Water Line ConnectionsValve Discharge Pipe Tube Inlet Installation Installation Diagrams Top Inlet/Outlet UsageHeater Wiring Gas Meter Size Natural Gases Only Gas Line Leak TestingGas Piping PurgingStart Up Prior to Start UpInitial Start Up Checking the Input Water Temperature AdjustmentChecking Venting Gas ValvesLighting & Operation Label Sequence of OperationSequence of Operation Flow Chart Maintenance To Drain the Water Heater Storage Tank Hot Water OdorAnode Rod Inspection Draining and FlushingExample Tank Cleanout ProcedureDeliming Using FLO-JUG Method Deliming SolventsChemical Hazard System Diagnostics Ignition Module SystemElectrical Servicing Operational Conditions High Water Temperature Shut Off SystemFor Your Information Start Up ConditionsTroubleshooting Qualified Service AgencyComplaint Cause Remedy User Water Piping DiagramsTemperature & Pressure Temperature & Pressure Relief Valve Circulating Pump Multi Flue 2 Units Multi Flue 2 Units with Vertical Storage Tank Multi Flue 2 Units with Vertical Storage Tank Return from Multi Flue 2 Units TWO Temperature Multi Flue 2 Units with Booster TWO Temperature MULTI-FLUE 3 Units MULTI-FLUE 3 Units with Vertical Storage Tank MULTI-FLUE 3 Units with Horizontal Storage Tank Multi Flue Flue 4 Units MULTI-FLUE 4 Units with Vertical Storage Tank MULTI-FLUE 4 Units with Horizontal Storage Tank Manifold Kits Conditions and Exceptions Service and Repair ExpensesClaim Procedure ALL Other Parts