Raypak 122-322 Section C Combustion and Ventilation AIR, Direct Combustion AIR

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SECTION C: COMBUSTION AND VENTILATION AIR

COMBUSTION AND VENTILATION AIR (Indoor Units)

The heater must be supplied with sufficient quantities of non-contaminated air to support proper combustion and equipment ventilation. Combustion air can be supplied via conventional venting, where combustion air is drawn from the area immedi- ately surrounding the heater, or via direct vent, where combustion air is drawn directly from outside. All installations must comply with the requirements of NFGC (U.S.), B 149.1 and .2 (Canada), and all local codes.

CAUTION:

Combustion air must not be contaminated by corrosive chemical fumes which can damage the heater and void the warranty. See appendix A.

DIRECT COMBUSTION AIR

If outside air is drawn through the intake pipe directly to the unit for combustion:

1.Install combustion air direct vent in accordance with Section J of this manual.

CONVENTIONAL COMBUSTION AIR SUPPLY (FOR U.S. INSTALLATION ONLY)

(a)All Air from Inside the Building. The confined space shall be provided with two permanent openings communicating directly with an additional room(s) of sufficient volume so that the combined volume of all spaces meets the criteria for an unconfined space. The total input of all gas utilization equipment installed in the combined space shall be considered in making this determination. Each opening shall have a minimum free area of 1 square inch per 1,000 Btu per hour (22 cm2 per kW) of the total input rating of all gas utilization equipment in the confined space, but not less than 100 in.² (645 cm2). One opening shall commence within 12 in. (30 cm) of the top, and one opening shall commence within 12 in. (30 cm) of the bottom, of the enclosure. The minimum dimension of air openings shall be not less than 3 in. (8 cm) in any direction.

(b)All Air from Outdoors. The confined space shall communicate with the outdoors in accordance with methods 1 or 2. The minimum dimension of air openings shall not be less than 3 in. (8 cm) in any direction. Where ducts are used, they shall be of the same cross-sectional area as the free area of the openings to which they connect.

1.Two permanent openings, one commencing within 12in. (30 cm) of the top, and one commencing within 12in. (30 cm) of the bottom, of the enclosure shall be provided. The openings shall communicate directly, or by ducts, with the outdoors or spaces (crawl or attic) that freely communicate with the outdoors.

a. Where directly communicating with the outdoors or where communicating to the outdoors through vertical ducts, each opening shall have a minimum free area of 1 sq in. per 4000 Btu per hr (5.5 cm2 per kW) of total input rating of all equipment in the enclosure.

b. Where communicating with the outdoors through horizontal ducts, each opening shall have a minimum free area of 1 sq in. per 2000 Btu per hr (11 cm2 per kW) of total input rating of all equipment in the enclosure.

2.One permanent opening, commencing within 12 in. (30 cm) of the top of the enclosure, shall be permitted where the equipment has clearances of at least 1 in. (2.5 cm) from the sides and back and 6 in. (16 cm) 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 (crawl or attic) that freely communicate with the outdoors, and shall have a minimum free area of:

a. 1 sq in. per 3000 Btu per hr (7 cm2 per kW) of the total input rating of all equipment located in the enclosure, and b. Not less than the sum of the areas of all vent connectors in the confined space.

WARNING:

Do not use one permanent opening method if the equipment room is under negative pressure condition or the equipment is common vented with other gas-fired appliances.

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Contents Operating Installation Instructions Table of Contents Page Product Receipt Section a Before Installing the HeaterRatings and Certifications Model IdentificationHI Delta Component Location General Information Equipment Base Section B Heater InstallationInstallationcodes Heater Side 122-322 ModelsHeater Side 120-322 OutdoorinstallationsOutdoor Installation Minimum Clearances Heater ModelDirect Combustion AIR Section C Combustion and Ventilation AIRCombustion and Ventilation AIR Indoor Units Page Reliefvalve Piping LOW Temperature SystemTemperature & Pressure Gauge Section D Water Piping GeneralSection E Hydronic Heating Piping Page Table F-1 Domestic Water Heater Flowrate Requirements Section F Domestic HOT Water PipingSingle Heater Domestic HOT Water with ONE Storage Tank Pooland SPA Water Chemistry Section G Pool HeatingAutomatic Chlorinators and Chemicalfeeders Winterizingyou HeaterGAS Supply Pressure Section H GAS Supply ConnectionsGAS Supply Connection GAS Pressure Regulator Surge Protection Section I Electrical Power ConnectionsCheck the Power Source Check Power SourceMaking the Electrical Connections Field Wiring ConnectionShockhazard Electrical Connections Domestic HOT WaterDefinition ofAppliance Categories Section J Venting ConnectionsTable J-1 Vent Terminal Location General Support of Vent StackVenting Configurations Venting Installation TipsNatural Draft Verticalvent Section J-1 Natural Draft Vertical Venting CategoryNatural Draft Vertical Vent Termination Natural Draft Vertical Venting System InstallationPage HORIZONTALTHRU-WALLVENTING Category III Table Section J-2Horizontal Thru-wall Direct Vent Termination HORIZONTALTHRU-WALLVENTING Table Section J-3 Direct VentHorizontal Thru-wall Direct Vent Termination Verticalventing Table Direct VentVertical Direct Vent Termination Vertical Direct Vent System InstallationSection J-5 Section K Controls Operating Control Ignitionmodule High Limit Manual ResetManual Reset High Limit Flow Switch Ignition Control ModuleLOW Water CUT-OFF LOW Water CUT OFF OptionalWire Diagram Models TIME/TEMPERATURE Relationships in Scalds Section L General Safety PrecautionsSection M PRE-START-UP Turn Off Main Gas Valve Section N Initial START-UPTools Needed Preparation for START-UPYour Hi Delta is tuned START-UPSection O Post START-UP Check Toturn Offgastoappliance Section P OperationSuggested Minimum Maintenance Schedule Section Q MaintenanceInsidecombustionaircontamination Appendix aFig # Heat Exchanger Detail Page Page Page Corporate Headquarters
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122-322 specifications

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