American Water Heater HCG3 130T 300 instruction manual Fresh Air Openings For Confined Spaces

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Fresh Air Openings For Confined Spaces

The following instructions shall be used to calculate the size, number and placement of openings providing fresh air for combustion, ventilation and dilution in confined spaces. The illustrations shown in this section of the manual are a reference for the openings that provide fresh air into confined spaces only. Do not refer to these illustrations for the purpose of vent installation. See Venting Installation on page 21 for complete venting installation instructions.

Outdoor Air Through Two Openings

Figure 10

The confined space shall be provided with two permanent openings, one commencing within 12 inches (300 mm) of the top and one commencing within 12 inches (300 mm) of the bottom of the enclosure. The openings shall communicate directly with the outdoors. See Figure 10.

Each opening shall have a minimum free area of 1 square inch per 4,000 Btu/hr (550 mm2 per kW) of the aggregate input rating of all appliances installed in the enclosure. Each opening shall not be less than 100 square inches (645 cm2).

Outdoor Air Through One Opening

Figure 11

Alternatively a single permanent opening, commencing within 12 inches (300 mm) of the top of the enclosure, shall be provided. See Figure 11. The water heater shall have clearances of at least 1 inch (25 mm) from the sides and back and 6 inches (l50

mm)from the front of the appliance. The opening shall directly communicate with the outdoors or shall communicate through a vertical or horizontal duct to the outdoors or spaces that freely communicate with the outdoors and shall have a minimum free area of the following:

1.1 square inch per 3000 Btu/hr (700 mm2 per kW) of the total input rating of all appliances located in the enclosure, and

2.Not less than the sum of the areas of all vent connectors in the space.

Outdoor Air Through Two Horizontal Ducts

Figure 12

The confined space shall be provided with two permanent horizontal ducts, one commencing within 12 inches (300 mm) of the top and one commencing within 12 inches (300 mm) of the bottom of the enclosure. The horizontal ducts shall communicate directly with the outdoors. See Figure 12.

Each duct opening shall have a minimum free area of 1 square inch per 2,000 Btu/hr (1100 mm2 per kW) of the aggregate input rating of all appliances installed in the enclosure.

When ducts are used, they shall be of the same cross sectional area as the free area of the openings to which they connect. The minimum dimension of rectangular air ducts shall be not less than 3 inches.

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Contents Commercial gas water heaters Table Of Contents Safe Installation, Use and Service ANSI/NSF-5Optional General Safety Information PrecautionsHydrogen Gas Flammable Fire or Explosion Hazard Fire and Explosion HazardIntroduction Preparing For The InstallationQualified Installer or Service Agency Abbreviations UsedFeatures And Components Basic OperationTop View Top View ComponentsSide Views Recovery Capacities Installation ConsiderationsRough In Dimensions Gas Line Connection SizeClearance To Combustible Materials Service ClearanceLocating The Water Heater Intake Air and Vent Pipe ClearancesHard Water Extended Vent TerminationsOptional Concentric Terminations Circulation PumpsGas Pressure Requirements Installation RequirementsPower Supply Supply Gas LineClosed Water Systems Mixing ValvesDishwashing Machines Thermal ExpansionTemperature-Pressure Relief Valve Valve Discharge Pipe RequirementsContaminated Air Condensate DrainCombustible Material Storage Condensate Drain Water TrapAir Requirements Unconfined SpaceConfined Space Outdoor Air Through One Opening Fresh Air Openings For Confined SpacesOutdoor Air Through Two Openings Outdoor Air Through Two Horizontal DuctsPage Commonwealth of Massachusetts InspectionVenting Installation General Venting InformationGeneral Venting Instructions Venting Requirements Venting Installation Sequence Power Vent InstallationDirect Vent Installation Vertical Termination Installation Intake AIR Screen Balance PlateVertical Termination Direct Vent Sidewall Termination Installation Sidewall Termination InstallationConcentric Termination Installation Inch Concentric Termination Flat Roof ClearanceInch Concentric Termination Installation Inch Concentric Termination KITInch Concentric Termination Sidewall Installation Vent Pipe is 4 Inch Schedule 40 PVCFour Concentric Terminations TWO Concentric TerminationsThree Concentric Terminations Eight Concentric TerminationsMultiple Concentric Termination Arrangements Two Concentric TerminationsEight Concentric Terminations Power Vent Horizontal Venting ArrangementsDirect Vent Horizontal Direct Vent Vertical Vent Horizontal Intake Direct Vent Horizontal Vent Vertical IntakeDirect Vent Horizontal Concentric Termination Clearances Sidewall Power Vent Power VentTermination Clearances Sidewall Direct Vent Direct VentInstallation Notes Water Heater InstallationCondensate Drain Installation Installation InstructionsSupply Gas Line Sizing U. S. Units Supply Gas Line InstallationGas Line Sizing Supply Gas Line Sizing Metric UnitsSupply Gas Regulator Installation Gas Line Leak TestingGas Line Connection Enable/Disable Circuit Electrical WiringPower Supply Connections Connecting An External Supervisory ControlValve Discharge Pipe Water Piping DiagramsWater Line Connections Thermometers not SuppliedHigh Temperature Applications Temperature RegulationHigh Temperature Limit Control ECO Thermostat ControlControl System Navigation Control System OperationOverview User Input ButtonsStatus Icons Icon DescriptionControl System Menus Operating StatesState Description Menu DescriptionBack Help User Settings & Control System MenusUpdate Cancel Description/Action DisplayChange Back Help Display Settings Description/Action Heater Information Description/Action DisplayECO Back AdvancedView Back Help YESSelect Back Help UpdateService Contact Information NameStart Up Prior to Start upInitial Start Up Supply Gas Pressure Adjustment Multiple Appliance InstallationsManifold Gas Pressure Adjustment High Altitude Installations Checking The Firing RateTo Turn Off Gas Lighting The Water Heater Lighting & Operation LabelHoneywell Troubleshooting Installation ChecklistSequence Of Operation Sequence Of Operation Flow Chart YES noRough Starting, Rough Operation Operational ProblemsInstallation Errors Momentary IgnitionFault And Alert Conditions Fault And Alert Messages Possible Causes Check/Repair Displayed Fault/Alert MessageBlower Prover Failure General MaintenanceMaintenance Schedule Draining And FlushingFilling The Water Heater Sediment RemovalLime Scale Removal Temperature-Pressure Relief Valve Test Powered Anode RodsDrain Valve and Access Panels Vent SystemDiagrams CCB Central Control Board LayoutAHCG3 130T 300 Wiring Diagram User Interface ModulAHCG3 130T 400 Wiring Diagram UserCirculation Pump Wiring Diagrams Water Piping Diagrams Temperature & Pressure Tank Temperature ALT. Cold Water American Storage Tank Water Piping Diagrams Line Temperature Control HOT Water Outlet Pipe T&P to Open Drain Finished Floor Limited Warranty