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If a gas appliance is operating in a room with negative pressure, the flue products can be pulled back down the vent pipe and into the room. This reverse flow of the flue gas may result in incomplete combustion and the formation of carbon monoxide gas. This toxic gas might then be distributed throughout the house by the furnace duct system. Use fiberglass sealing strips, caulking, or equivalent sealing method between the plenum and the furnace cabinet to ensure a tight seal. If a filter is installed, size the return air duct to fit the filter frame. Pipe & Fittings Specifications All pipe, fittings, primer and solvent cement must conform with American National Standard Institute and the American Society for Testing and Materials (ANSI/ASTM) standards. The solvent shall be free flowing and contain no lumps, undissolved particles or any foreign matter that adversely affects the joint strength or chemical resistance of the cement. The cement shall show no gelation, stratification, or separation that cannot be removed by stirring. Refer to Table 4 below for approved piping and fitting materials. CAUTION Solvent cements for plastic pipe are flammable liquids and should be kept away from all sources of ignition. Do not use excessive amounts of solvent cement when making joints. Good ventilation should be maintained to reduce fire hazard and to minimize breathing of solvent vapors. Avoid contact of cement with skin and eyes. PIPING AND FITTINGS SPECIFICATIONS Schedule 40 PVC (Pipe) D1785 Schedule 40 PVC (Cellular Core Pipe) F891 Schedule 40 PVC (Fittings) D2466 Schedule 40 CPVC (Pipe) F441 Schedule 40 CPVC (Fittings) F438 SDR.21 PVC or SDR.26 PVC (Pipe) D2241 SDR.21 CPVC or SDR.26 CPVC (Pipe) F442 Schedule 40 ABS Cellular Core DWV (Pipe) F628 Schedule 40 ABS (Pipe) D1527 Schedule 40 ABS (Fittings) D2468 ABS.DWV (Drain Waste & Vent) (Pipe & Fittings) D2661 PVC.DWV (Drain Waste & Vent) Pipe & Fittings) D2665 PRIMER & SOLVENT CEMENT ASTM SPECIFICATION PVC & CPVC Primer F656 PVC Solvent Cement D2564 CPVC Solvent Cement F493 ABS Solvent Cement D2235 PVC/CPVC/ABS All Purpose Cement For Fittings & Pipe of the same material D2564, D2235, F493 ABS to PVC or CPVC Transition Solvent Cement D3138 CANADA PIPE & FITTING & SOLVENT CEMENT MARKING PVC & CPVC Pipe and Fittings ULCS636PVC & CPVC Solvent Cement ABS to PVC or CPVC Transition Cement TABLE 4 Page 12 of 48 Issue 1109 506725-01 IMPORTANT The exhaust and intake connections are made of PVC. Use PVC primer and solvent cement when using PVC vent pipe. When using ABS vent pipe, use transitional solvent cement to make connections to the PVC fitting in the unit. Use PVC primer and solvent cement or ABS solvent cement meeting ASTM specifications, refer to Table 4. As an alternate, use all purpose cement, to bond ABS, PVC, or CPVC pipe when using fittings and pipe made of the same materials. Use transition solvent cement when bonding ABS to either PVC or CPVC. Low temperature solvent cement is recommended during cooler weather. Metal or plastic strapping may be used as vent pipe hangers. Uniformly apply a liberal coat of PVC primer for PVC or use a clean dry cloth for ABS to clean inside socket surface of fitting and male end of pipe to depth of fitting socket. Canadian Applications Only Pipe, fittings, primer and solvent cement used to vent (exhaust) this appliance must be certified to ULC S636 and supplied by a single manufacturer as part of an approved vent (exhaust) system. When bonding the vent system to the furnace, use ULC S636 approved One-Step Transition Cement to bond the pipe to the flue collar. In addition, the first three feet of vent pipe from the furnace flue collar must be accessible for inspection. Table 5 Lists the available exhaust termination kits. All vent terminations are PVC. OUTDOOR TERMINATION KITS USAGE A95DF A93DF 95G1DF 92G1DF VENT PIPE DIA. (in.) STANDARD CONCENTRIC Outdoor Exhaust Accelerator (Dia. X Length) Outdoor Exhaust Accelerator (Dia. X Length) Flush- Mount Kit 1.1/2" Concentric Kit 2" Concentric Kit 3" Concentric Kit 1.1/2" X 12" 2" X 12" 51W11** 71M80 or 44W92 69M29 or 44W92 60L46 or 44W93 045 2 YES YES YES 2.1/2 YES YES YES 3 YES YES YES 070 2 YES YES YES 2.1/2 YES YES YES 3 YES YES YES 090 2 YES YES YES YES 2.1/2 YES YES YES YES 3 YES YES YES YES 110 2 YES YES YES YES 2.1/2 YES YES YES YES 3 YES YES YES YES *Requires field.provided and installed 1.1/2" exhaust accelerator. ** Kit 51W11 is provided with a 1.1/2" accelerator which must be used for all 45,000 and 70,000 furnace installations. †† The 44W92 Concentric kit is provided with a 1-1/2” accelerator which must be installed on the exhaust outlet when this kit is used with the 45,000 and 70,000 furnaces. TABLE 5 506725-01 Page 13 of 48 Issue 1109 Joint Cementing Procedure Venting Practices All cementing of joints should be done according to the specifications outlined in ASTM D 2855. NOTE: A sheet metal screw may be used to secure the intake pipe to the connector, if desired. Use a drill...
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