Raypak HD401 Installation & Operating Instructions Manual

Also see for HI DELTA HD101 THRU 2342B: Brochure & specs User's information manual User manual Installation & operating instructions Installation & operating instructions

WARNING: Do not use one permanent openingmethod if the equipment room is under negativepressure conditions or the equipment is commonvented with other gas-fired appliances.1. Ventilation of the space occupied by the heatershall be provided by an opening(s) for ventilationair at the highest practical point communicatingwith outdoors. The total cross-sectional area ofsuch an opening(s) shall be at least 10% of thearea required in (2) and (3), but in no case shallthe cross-sectional area be less than 10 in. 2 (6500mm2 .).2. For heaters using a barometric damper in the ventsystem, and when air supply is provided by naturalCAUTION: All combustion air must be drawn fromthe air outside of the building; the mechanicalequipment room must communicate directly with theoutdoors.Installations in CanadaWater PipingGeneralThe heater should be located so that any water leakswill not cause damage to the adjacent area or struc-tures.air flow from the outdoors for natural draft, partialfan assisted, fan-assisted or power draft-assistedburners, there shall be a permanent air supplyopening(s) having a cross section area of not lessthan 1 in.2 per 7000 BTUH (310 mm 2 per kW) upto and including 1 million BTUH, plus 1 in.2 per14000 BTUH (155 mm 2 per kW) in excess of 1 mil-lion BTUH. This opening(s) shall be either locatedat or ducted to a point not more than 18 in. (450mm) nor less than 6 in. (150 mm) above the floorlevel. The duct can also "Goose Neck" through theroof. The duct is preferred straight down 18” fromfloor, but do not place near piping. This air supplyopening requirement shall be in addition to the airopening for ventilation air required in (1).3. For heaters not using a barometric damper in thevent system, and when air supply is provided bynatural air flow from outdoors for a power burnerand there is no draft regulator, drafthood or similarflue gas dilution device installed in the samespace, in addition to the opening for ventilation airrequired in (1), there shall be a permanent air sup-ply opening(s) having a total cross-sectional areaof not less than 1 in.2 for each 30,000 BTUH (70mm2 per kW) of total rated input of the burner(s),and the location of the opening(s) shall not inter-fere with the intended purpose of the opening(s)for ventilation air referred to (1). This opening(s)can be ducted to a point not more than 18 in. (450mm) nor less than 6 in. (150 mm) above the floorlevel. The duct can also "Goose Neck" through theroof. The duct is preferred to be straight down 18”from floor, but do not place near piping.4. Refer to the latest version of the B149 for addition-al information.CAUTION: This heater requires forced watercirculation when the burner is operating. See Table Eand Table F for minimum and maximum flow ratesand water pump selection. The pump must beinterlocked with the heater to prevent heateroperation without water circulation.a. Where directly communicating with the out-doors or where communicating to theoutdoors through vertical ducts, each openingshall have a minimum free area of 1 in.2 per4000 BTUH (5.5 cm 2 per kW) of total input rat-ing of all equipment in the enclosure.b. Where communicating with the outdoorsthrough horizontal ducts, each opening shallhave a minimum free area of 1 in.2 per 2000BTUH (11 cm 2 per kW) of total input rating ofall equipment in the enclosure.2. One permanent opening, commencing within 12in. (30 cm) of the top of the enclosure, shall bepermitted where the equipment has clearances ofat least 1 in. (2.5 cm) from the sides and back and6 in. (16 cm) from the front of the appliance. Theopening shall directly communicate with the out-doors or shall communicate through a vertical orhorizontal duct to the outdoors or spaces (crawl orattic) that freely communicate with the outdoors,and shall have a minimum free area of:a. 1 in.2 per 3000 BTUH (7 cm 2 per kW) of thetotal input rating of all equipment located in theenclosure, andb. Not less than the sum of the areas of all ventconnectors in the confined space.12