Assessments - 4, GPA: 4.3 ( )

Fabricante : Sears Arquivo Tamanho: 3.24 mb Arquivo Nome : Língua de Ensino:

If DWV elbows cannot be used, use two, 45 ° elbows when possible. • Commercial buildings. On horizontal runs the elbows can be slightly misaligned to provide the correct slope. • Buildings with indoor pools. 9. All horizontal pipe runs MUST be supported at least every • Furnaces installed in laundry rooms. five feet with galvanized strap or other rust resistant materi • Furnaces installed in hobby or craft rooms. al. NO sags or dips are permitted. • Furnaces installed near chemical storage areas. 10. All vertical pipe runs MUST be supported every six feet where accessible. • Permanent wave solutions for hair. 11. The minimum pipe run length is 2'. • Chlorinated waxes and cleaners. 12. The piping can be run in the same chase or adjacent to sup• Chlorine based swimming pool chemicals. ply or vent pipe for water supply or waste plumbing. It can also be run in the same chase with a vent from another 90+ • Water softening chemicals. furnace. • De-icing salts or chemicals. NOTE: In NO case can the piping be run in a chase where • Carbon tetrachloride. temperatures can exceed 140 ° F. or where radiated heat from adjacent surfaces would exceed 140 ° F. • Halogen type refrigerants. 13. The vent outlet MUST be installed to terminate in the same • Cleaning solvents (such as perchloroethylene). atmospheric pressure zone as the combustion air inlet. • Printing inks, paint removers, varnishes, etc. 14. The vent system can be installed in an existing unused • Hydrochloric acid. chimney provided that: • Sulfuric Acid. • Both the exhaust vent and air intake run the length of the chimney. • Solvent cements and glues. • No other gas fired appliance or fireplace (solid fuel) is • Antistatic fabric softeners for clothes dryers. vented into the chimney. • Masonry acid washing materials. • The top of the chimney MUST be sealed flush or crowned up to seal against rain or melting snow so ONLY the piping Vent and Combustion Air Piping Guidelines protrudes. • Thetermination clearances shown in Figure 7 & Figure This furnace is approved for venting with Schedule 40 PVC, are maintained. CPVC, ABS, Cellular Core pipe fittings and SDR-26 PVC. 15. Furnace applications with vertical vents requiring vent di- NOTE: All PVC, CPVC, ABS, and Cellular Core pipe fittings, solameter increaser fittings must have increaser fittings vent cement, primers and procedures MUST conform to American installed in vertical portion of the vent. Condensate will be National Standard Institute and American Society for Testing and trapped in the vent if the vent diameter is increased prior to Materials (ANSI/ASTM) standards. having an elbow turned upward. This could cause nuisance tripping of the pressure switch. • Pipe and Fittings -ASTM D1785, D2241, D2466, D2661, D2665, F-891, F-628 Piping InsulationGuidelines • PVCPrimerandSolventCement-ASTM D2564 NOTE: Use closed cell, neoprene insulation or equivalent. If Fiber• Procedure for Cementing Joints -Ref ASTM D2855 glass or equivalent insulation is used it must have a vapor barrier. Use R values of 7 up to 10', R-11 if exposure exceeds 10'. If Fiber- NOTE: All vent piping MUST be installed in compliance with local codes or ordinances, these instructions, good trade practices, and glass insulation is used, exterior to the structure, the pipe MUST be boxed in and sealed against moisture. codes of country having jurisdiction. 1. When the vent or combustion air pipe height above the roof 1. Determine the best routing and termination for the vent pipe exceeds 30", or if an exterior vertical riser is used on a hori and air inlet pipe by referring to all of the instructions and zontal vent to get above snow levels, the exterior portion guidelines in this Section. MUST be insulated. 2. Determine the size required for the vent pipe and air inlet When combustion air inlet piping is installed above a suspipe. pended ceiling, the pipe MUST be insulated with moisture 3. Loosely assemble all venting parts without adhesive (pipe resistant insulation such as Armaflex or other equivalent joint cement) for correct fit before final assembly. type of insulation. 44001102004 E!9 3. Insulate combustion air inlet piping when run in warm, humid spaces such as basements. Sizing Combustion Air and Vent Pipe Consult Table 3 or Table 4 to select the proper diameter exhaust and combustion air piping. Exhaust and combustion air piping is sized for each furnace Btuh size based on total lineal vent length (on inlet oroutlet side), and number of 90 ° elbows required. Two 45 ° elbows can be substituted for one 90 ° elbow. The elbow or el bows used for vent termination outside the structure ARE counted, including elbows needed to bring termination above expected snow levels. The elbow inside the furnace on the *9MPD IS NOT included in the count. Pipe Diameter Table N9MP1 & *9MPD Models 50,000, 75,000 & 80,000 Btuh Furnaces 40' & (5) 90 ° elbows with 2" PVC pipe or 70' & (5) 90 ° elbows with 3" PVC pipe 100,000 Btuh Furnace 40' & (5) 90 ° elbows with...

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