Rheem Versa Heaters Operating Instructions - Page 10
Indoor Installation, Combustion & Ventilation Air
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Indoor Installation All Air From Inside the Building The heater is design-certified for indoor installation Each opening shall have a minimum net free area of when equipped with the approved drafthood. 130 sq. in. NOTE: For Canada, indoor installation is restricted to an enclosure that is not occupied and does not directly communicate with an occupied area. Refer to the latest edition of CAN/CSA-B149 for specific requirements. All Air From Outdoors When air is supplied directly from outside of building, each opening shall have a minimum net free area of 33 sq. in. Locate heater as close as is practical to a chimney or gas vent. Heater must always be vented to the outside. See Vent Piping section for details. Minimum allowable space is shown on the nameplate. Follow the installation instructions provided with the Indoor Drafthood Kit for installation. Indoor Drafthood NOTE: The indoor drafthood is optional equipment and does not come standard with the heater. Use the following part number: P/N 003723. CAUTION: Combustion air must not be contaminated by corrosive chemical fumes which can damage the heater and void the warranty. Do not store chlorine, bromine, baquasil or acid in the same room as the heater. Vent Piping Vent piping the same size as the drafthood outlet is recommended, however, when the total vent height is at least 10 ft (drafthood relief opening to vent terminal), the vent pipe size may be reduced as specified in the National Fuel Gas Code, ANSI Z223.1 (Canada CAN/CSA-B149). As much as possible, avoid long horizontal runs of vent pipe and too many elbows. Indoor Drafthood If installation requires horizontal runs, the vent pipe must have a minimum of 1/4 in. per ft rise and should be supported at not more than five foot intervals. Plumbers tape, criss-crossed, will serve to space both horizontal and vertical piping. Gas vents supported only by the flashing and extending above the roof more than five feet should be securely guyed or braced to withstand snow and wind loads. We recommend use of insulated vent pipe spacers through the roof and walls. Fig. 6: Indoor Drafthood Combustion & Ventilation Air (Indoor Units Only) The heater must have both combustion and ventilation air. Minimum requirements for net free air supply openings are one opening that is 12 inches from the ceiling for ventilation, and one opening that is 12 inches from the floor for combustion air as outlined in the latest edition of the National Fuel Gas Code, ANSI Z223.1(Canada-CAN/CSA-B149) and any local codes that may have jurisdiction. For protection against rain or blockage by snow, the vent pipe must terminate with a vent cap which complies with local codes or, in the absence of such codes, the latest edition of the National Fuel Gas Code, ANSI Z223.1 (Canada - CAN/CSA-B149). The discharge opening must be a minimum of 2 ft vertically from the roof surface and at least 2 ft higher than any part of the building within 10 ft. Vent stack shall be at least 5 ft in vertical height above the drafthood outlet. The vent cap location shall have a minimum clearance of 4 ft horizontally from, and in no case below, unless a 4 ft horizontal distance is maintained, from electric meters, gas meters, regulators and relief equipment. 10