Carrier 58MSA Installation, Start-up, And Operating Instructions Manual

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Carrier 58MSA Installation, Start-up, And Operating Instructions Manual Manual pdf 29 page image

8. Chamfer outside edge of pipe for better distribution of primerand cement.9. Clean and dry all surfaces to be joined.10. Check dry fit of pipe and mark insertion depth on pipe.NOTE: It is recommended that all pipes be cut, prepared, andpreassembled before permanently cementing any joint.11. After pipes have been cut and preassembled, apply generouslayer of cement primer to pipe fitting socket and end of pipeto insertion mark. Quickly apply approved cement to end ofpipe and fitting socket (over primer). Apply cement in a light,uniform coat on inside of socket to prevent buildup of excesscement. Apply second coat.12. While cement is still wet, twist pipe into socket with 1/4 turn.Be sure pipe is fully inserted into fitting socket.13. Wipe excess cement from joint. A continuous bead of cementwill be visible around perimeter of a properly made joint.14. Handle pipe joints carefully until cement sets.15. Support vent piping a minimum of every 5 ft (3 ft for SDR-21or -26 PVC) using perforated metal hanging strap.16. Slope vent pipe downward toward furnace a minimum of 1/4in. per linear ft with no sags between hangers.17. Use appropriate methods to seal openings where vent pipepasses through roof or sidewall.EXTENDED EXPOSED SIDEWALL PIPESSidewall vent pipe termination may be extended beyond areashown in Fig. 40 in outside ambient by insulating pipe as indicatedin Table 7.1. Determine vent pipe diameter, as stated above, using total pipelength and number of elbows.2. Find appropriate temperature for your application and furnacemodel using winter design temperature (used in load calcula-tions).3. Determine required insulation thickness for exposed pipelengths.NOTE: Pipe length (ft) specified for maximum pipe lengthslocated in unconditioned spaces cannot exceed total allowable pipelength as specified in Table 6.Step 3—Vent TerminationVent pipe must terminate either through roof or sidewall. SeeTable 8 for required clearances. See Fig. 39, 40, and 41 for exteriorpiping arrangements.Consideration of the following should be made when determiningan appropriate location for termination:1. Comply with all clearance requirements stated in Table 8.2. Termination should be positioned where vent vapors will notdamage plants/shrubs or air conditioning equipment.3. Termination should be positioned where it will not be dam-aged by or subjected to foreign objects such as stones, balls,etc.4. Termination should be positioned where vent vapors are notobjectionable.Fig. 38—Short Vent (5 to 8 Ft) SystemA96189HORIZONTAL TO ROOF HORIZONTAL TO SIDEWALLVERTICAL TO SIDEWALLVERTICAL TO ROOFVENT PIPE VENT PIPEVENT PIPEVENT PIPE12″ MIN12″ MIN12″ MIN12″ MINNOTE: A 12-In. minimum offset pipe section is recommended withshort (5 to 8 ft) vent systems. This recommendation is to reduceexcessive condensate droplets from exiting the vent pipe.29