Raypak XFyre 300A Installation & Operating Instructions Manual

Combustion Air FilterThis heater is supplied with an integral combustion airfilter. This filter will reduce the amount of particulatesthat pass through the combustion system and heatexchanger but will not protect against chemical insideair contamination (See Appendix). The filter must bechecked periodically to verify that adequate combus-tion air is being supplied to the heater. See theMaintenance section of this manual for information onchecking the filter and establishing service intervals.Direct VentIf outside air is drawn through the intake pipe directlyto the unit for combustion:1. Install the combustion air ducting kit.2. Install combustion air direct vent in accordancewith Fig. 24 (horizontal) or Fig. 26 (vertical) of thismanual.3. Ventilation of the space occupied by the heater(s)is recommended and can be provided by an open-ing(s) for ventilation air at the highest practicalpoint communicating with the outdoors. The totalcross-sectional area should be at least 1 in² of freearea per 20,000 BTUH (111 mm² per kW) of totalinput rating of all equipment in the room when theopening is communicating directly with the out-doors or through vertical duct(s). The totalcross-sectional area should be at least 1 in² of freearea per 10,000 BTUH (222 mm² per kW) of totalinput rating of all equipment in the room when theopening is communicating with the outdoorsthrough horizontal duct(s). Damage to the equip-ment due to inadequate ventilation of the space isnot a warrantable failure.4. In cold climates, and to mitigate potential freeze-up, Raypak highly recommends the installation ofa motorized sealed damper on the air intake toprevent the circulation of cold air through theheater during the non-operating hours.TruSeal™ Combustion AirIn addition to the 4 previous steps, combustion air maybe ducted directly to the heater by using PVC, CPVCor sealed single-wall galvanized ducting. The duct willattach directly to the air collar located on the rear of theheater when the combustion air ducting kit is installed,using three or four sheet metal screws (not supplied)equally positioned around the circumference of theduct. The screws and duct connection point must besealed with RTV (not supplied). TruSeal is generallyused when damaging contaminants are present in themechanical room. All ducting must be self-supported.Conventional Combustion AirSupplyU.S. InstallationsAll Air from Inside the BuildingThe confined space shall be provided with TWO per-manent openings communicating directly with anadditional room(s) of sufficient volume so that the com-bined volume of all spaces meets the criteria for aroom large in comparison (NFGC). The total input of allgas utilization equipment installed in the combinedspace shall be considered in making this determina-tion. Each opening shall have a minimum free area of1 in.2 per 1,000 BTUH (2,225 mm 2 per kW) of the totalinput rating of all gas utilization equipment in the con-fined space, but not less than 100 in.2 (645 cm 2 ). Oneopening shall commence within 12 in. (305 mm) of thetop, and one opening shall commence within 12 in.(305 mm) of the bottom of the enclosure. The mini-mum dimension of air openings shall be not less than3 in. (76 mm) in any direction.All Air from OutdoorsThe confined space shall communicate with the out-doors in accordance with one of the methods below.The minimum dimension of air openings shall not beless than 3 in. (76 mm) in any direction. Where ductsare used, they shall be of the same cross-sectionalarea as the net free area of the openings to which theyconnect.1. Two permanent openings, one commencingwithin 12 in. (305 mm) of the top, and one com-mencing within 12 in. (305 mm) of the bottom ofthe enclosure, shall be provided. The openingsshall communicate directly, or by ducts, with theoutdoors or spaces (crawl or attic) that freely com-municate with the outdoors.CAUTION: Use TruSeal combustion air ifdamaging airborne contaminants are or may bepresent in the boiler area. See the Appendix of thismanual regarding air contamination.NOTE: To ensure proper cooling and ventilation ofcomponents, do not block any air openings in thecabinet11