HTP MC120 - Manual (Page 46)

46
LP-171 Rev. 4.10.14
H. EXHAUST VENT AND INTAKE PIPE INSTALLATION
1. The 2” exhaust vent connection is located on the top, right side of the unit, and the intake is on the top left side. Use only solid PVC
or CPVC pipe, AL29-4C Stainless Steel, or a Polypropylene vent system approved for use with Category IV appliances. FOAM CORE
PIPING IS NOT APPROVED.
All joints of positive pressure vent systems must be sealed completely to prevent leakage of flue products into living space.
2. Remove all burrs and debris from joints and fittings.
3. When using PVC or CPVC pipe, all joints must be properly cleaned, primed, and cemented. Use only cement and primer approved
for use with the pipe material. Cement must conform to ASTM D2564 for PVC and ASTM F493 for CPVC pipe. NOTE: DO NOT
CEMENT POLYPROPYLENE PIPE.
4. Ensure the vent is located where it will not be exposed to prevailing winds.
5. In all roof venting applications, exhaust discharge must point away from the pitch of the roof.
6. To prevent water leakage, install adequate roof flashing where the pipe enters the roof.
7. Do not locate vent over public walkways, driveways, or parking lots. Condensate could drip and freeze, resulting in a slip hazard or
damage to vehicles and machinery.
8. Due to potential moisture build-up, sidewall venting may not be the preferred venting option. To save time and cost, carefully
consider venting installation and location.
9. Horizontal lengths of exhaust vent must slope back towards the heater not less than ¼" per foot to allow condensate to drain from
the vent pipe.
10. The exhaust vent must terminate where vapors cannot make accidental contact with people or pets, or damage shrubs or plants.
11. In vacant chimney applications, install and seal a rain cap over existing chimney openings.
12. All piping must be fully supported. Use pipe hangers at a minimum of 4 foot intervals to prevent sagging of the pipe where
condensate may form.
13. Do not use the heater to support any piping.
14. A screened straight coupling is provided with the heater for use as an outside exhaust termination.
15. A screened inlet air tee is provided with the heater to be used as an outside intake termination.
The following information on Table 7 lists optional intake air/exhaust vent terminations available from HTP.
DESCRIPTION STOCK CODE
2 ” PVC CONCENTRIC VENT TERMINATION KIT KGAVT0501CVT
3” PVC CONCENTRIC VENT TERMINATION KIT KGAVT0601CVT
2” STAINLESS STEEL VENT TERMINATION KIT V500
3” STAINLESS STEEL VENT TERMINATION KIT V1000
4” STAINLESS STEEL VENT TERMINATION KIT V2000
3” POLYPRO VENT KIT 8400P-001
Table 7