Carrier 59SC5B Installation, Start-up, Operating And Service And Maintenance Instructions

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43required by National code authorities. Allowable vent terminationsare shown in Fig. 55. The combustion air pipe terminates in awell--ventilated attic or crawl space. Follow the clearances asshown in Fig. 57.The combustion air pipe cannot terminate in attics or crawl spacesthat use ventilation fans designed to operate in the heating season.If ventilation fans are present in these areas, the combustion airpipe must terminate outdoors as a Direct Vent System.Non-Direct Vent / 1-Pipe SystemThe vent pipe for a Non Direct Vent (1--pipe) system mustterminate outdoors. See Fig. 53 for references to vent clearancesrequired by National Code authorities. Allowable ventterminations are shown in Fig. 55.A combustion air inlet pipe to the outdoors is not required for aNon--Direct (single--pipe) Vent System. A 12--in. long section ofpipe with a tight radius 2--in. (51 mm) 90 degree elbow is requiredto be attached to the furnace. See Fig. 56. This short inlet air pipehelps to ensure stable combustion, as well as allow for soundattenuation. To aid sound attenuation, point the inlet air pipe awayfrom occupants. An extra elbow and/or five feet of pipe may beused to accomplish the sound attenuation function.Termination Requirements for the Provinces of Alberta andSaskatchewanThe Provinces of Alberta and Saskatchewan require a minimumunobstructed distance of 4 ft. (1.2 M) from the foundation to theproperty line of the adjacent lot for vent termination of anyappliance with an input over 35,000 btuh. If there is less than 4 ft.(1.2 M) of unobstructed distance to the property line of theadjacent lot, no type of vent termination is permitted for applianceswith inputs greater than 35,000 btuh.There are no additional restrictions on unobstructed distancesgreater than 8 ft. (2.4 M). All single, two-pipe and concentric ventsmay be used, providing all other Code and manufacturer’srequirements in these instructions are adhered to. Refer to theappropriate Vent Termination section above for locating the ventterminationIf the unobstructed distance from the foundation to the propertyline of the adjacent lot is no less than 4 ft. (1.2 M) and no greaterthan 8 ft. (2.4 M), it will be necessary to re-direct the flue gasplume. In this situation, a concentric vent kit cannot be used. A2-pipe termination (or single pipe termination when permitted) thatre-directs the flue gas away by use of an elbow or tee, certified toULC S636 from the adjacent property line must be used. See Fig.56.The concentric vent kit currently cannot be modified to attach anelbow to the vent portion of the rain cap. A tee attached to the raincap could potentially direct the flue gas plume toward the intake airstream and contaminate the incoming combustion air for thefurnace.Refer to Fig. 56 for terminations approved for use in Alberta andSaskatchewan.Size the Vent and Combustion Air PipesGeneralFurnace combustion air and vent pipe connections are sized for2-in. (50 mm ND) PVC/ABS DWV pipe. The combustion air andvent pipe connections also accommodate 60 mm polypropyleneventing systems with outside diameters of approximately 60 mm(2--3/8 inches). Any pipe diameter change should be made outsidefurnace casing in vertical pipe. Any change in diameter to the pipemust be made as close to the furnace as reasonably possible. SeeFig. 41.The Maximum Vent Length for the vent and combustion air pipe(when used) is determined from the Maximum Equivalent VentLength in Table 16 minus the number of fittings multiplied by thededuction for each type of fitting used from Table 17.OPTIONAL CONFIGURATION FOR COMBUSTIONAIR INLET PIPEIn applications where there is a risk of excessive moistureentering the combustion air inlet pipe, a moisture trap may beadded to the inlet pipe to help prevent moisture from enteringthe furnace from the combustion air inlet pipe. See Fig. 40.When sizing venting systems, the equivalent length of theoptional moisture trap (15 feet/5 M) must be taken intoaccount.NOTICEEXAMPLE FORUPFLOW INSTALLATIONS.MAY BE APPLIED TOOTHER CONFIGURATIONS.A12220Fig. 39 -- Sample Inlet Air Pipe Connection for PolypropyleneVenting Systems