Raypak HIDELTA 992B Installation & Operating Instructions Manual

Also see for HI DELTA 1262B: Specification sheet Installation & operating instructions Specifications Installation & operating instructions Brochure & specs

14b. Not less than the sum of the areas of all ventconnectors in the confined space.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 the outdoors. The total cross-sectional area ofsuch an opening(s) shall be at least 10% of thearea required in 2. and 3. (below), but in no caseshall the cross-sectional area be less than 10 in. 2(65 cm 2 ).2. For heaters using a barometric damper in the ventsystem there shall be a permanent air supplyopening(s) having a cross section area of not lessthan 1 in. 2 per 7,000 BTUH (320 mm 2 per kW) upto and including 1 million BTUH, plus 1 in. 2 per14,000 BTUH (160 mm 2 per kW) in excess of 1million BTUH. This opening(s) shall be eitherlocated at or ducted to a point not more than 18 in.(450 mm) nor less than 6 in. (152 mm) above thefloor level. The duct can also “goose neck” throughthe roof. The duct is preferred to be straight downand terminated 18 in. (450 mm) from the floor, butnot near piping. This air supply opening require-ment shall be in addition to the air opening forventilation air required in 1. (above).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 areaCAUTION: All combustion air must be drawn fromthe air outside of the building; the mechanical equip-ment room must communicate directly with theoutdoors.of not less than 1 in. 2 for each 30,000 BTUH mm 2per kW) of total rated input of the burner(s), andthe location of the opening(s) shall not interferewith the intended purpose of the opening(s) forventilation air referred to in (1). This opening(s)can be ducted to a point not more than 18 in. (450mm) nor less than 6 in. (152 mm) above the floorlevel. The duct can also “goose neck” through theroof. The duct is preferred to be straight down 18in. (450 mm) from the floor, but not near piping.4. Refer to B149 Installation code for additional infor-mation.Water PipingGeneralThe heater should be located so that any water leakswill not cause damage to the adjacent area or struc-tures.Reversing Water ConnectionsFollow these instructions to change the water connec-tions from the left-hand side (standard) to theright-hand side.1. Disconnect all electrical power from the heater (ifapplicable).2. Label all electrical connections and conduit lines.This may include the flow switch, low water cut-offprobe and/or pump.3. Disconnect or isolate the main gas pipe from theheater (if applicable).4. Remove both in/out and return header accesspanels by removing all sheet metal screws.WARNING: Care must be taken to ensure that theequipment room is not under negative pressureconditions or that the equipment is not common-vented with other gas-fired appliances.NOTE: For 87%-efficiency boilers, see specialinstructions on page 45.CAUTION: This heater requires forced watercirculation when the burner is operating. See TableG and Table H for minimum and maximum flow ratesand water pump selection. The pump must beinterlocked with the heater to prevent heateroperation without water circulation.NOTE: Minimum pipe size for in/out connections is2 1⁄2 in. Verify proper flow rates and ΔT as instructedin this manual.Canadian Installations