Raypak Hi Delta 302A-902A Installation And Operating Instructions Manual

12Fig. 8: Minimum Clearances from CombustibleSurfaces – Outdoor InstallationsCombustion and Ventilation AirIndoor UnitsThe heater must be supplied with sufficient quantitiesof non-contaminated air to support proper combustionand equipment ventilation. Combustion air can be sup-plied via conventional means where combustion air isdrawn from the area immediately surrounding theheater, or via direct vent, where combustion air isdrawn directly from outside. All installations must com-ply with the requirements of the NFGC (U.S.) andB149.1 (Canada), and all local codes.Reversing Air FilterFollow these instructions to change the air duct con-nection from the left-hand side (standard) to the right-hand side:1. Remove the four screws and the dust cover fromthe right-hand side of the heater.2. Remove the four screws and the air filter bracketfrom the left-hand side of the heater.3. Reverse the components and reattach in the newlocation, making sure that the air filter lockingbracket is on the bottom. (The air filter lockingbracket is reversible.)Direct VentIf outside air is drawn through the intake pipe directlyto the unit for combustion:1. Install combustion air direct vent in accordancewith Fig. 26 (horizontal) or Fig. 27 (vertical) of thismanual (pages 31 and 32, respectively).2. Provide adequate ventilation of the space occu-pied by the heater(s) by an opening(s) for ventila-tion air at the highest practical point communicat-ing with the outdoors. The total cross-sectionalarea shall be at least 1 in. 2 of free area per 20,000BTUH (111 mm 2 per kW) of total input rating of allequipment in the room when the opening is com-municating directly with the outdoors or throughvertical duct(s). The total cross-sectional areashall be at least 1 in. 2 of free area per 10,000BTUH (222 mm 2 per kW) of total input rating of allequipment in the room when the opening is com-municating with the outdoors through horizontalduct(s).3. In cold climates, and to mitigate potential freeze-up, Raypak highly recommends the installation ofa motorized sealed damper to prevent the circula-tion of cold air through the heater during the non-operating hours.Direct-Ducted Combustion AirIn certain applications it may be desirable to duct thecombustion air directly to the heater. This should bedone with PVC, CPVC or single-wall galvanized duct-ing. The duct will attach directly to the collar on the airfilter housing located on the side of the heater. Theducting is attached to the air filter housing collar usingCAUTION: Combustion air must not be contami-nated by corrosive chemical fumes which can dam-age the heater and void the warranty. (See theAppendix.)NOTE: It is recommended that the intake vent beinsulated to minimize sweating.NOTE: Use of the heater in construction areaswhere fine particulate matter, such as concrete ordrywall dust, is present may result in damage to theheater that is not covered by the warranty. If operat-ed in a construction environment, a clean source ofcombustion air must be provided directly to theheater.