Exhaust Vent And Intake Pipe Installation; Venting Drawings; Direct Vent Installation Of Exhaust And Intake - Westinghouse WGR050NG076 Installation Instructions Manual

G. EXHAUST VENT AND INTAKE PIPE INSTALLATION
All joints of positive pressure vent systems must be sealed completely to prevent leakage of flue products into living space.
1. Use only solid PVC or CPVC pipe or a Polypropylene vent system approved for use with Category IV appliances.
FOAM CORE PIPING IS NOT APPROVED FOR EXHAUST VENT APPLICATIONS. Foam core piping may be used on air inlet piping
only.
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 water 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.
Table 7 lists optional exhaust/intake terminations available from Westinghouse:
DESCRIPTION
2" PVC CONCENTRIC VENT TERMINATION KIT
3" PVC CONCENTRIC VENT TERMINATION KIT
2" STAINLESS STEEL VENT TERMINATION KIT
3" STAINLESS STEEL VENT TERMINATION KIT
Table 7
H. VENTING DRAWINGS

1. DIRECT VENT INSTALLATION OF EXHAUST AND INTAKE

If installing a direct vent option, combustion air must be drawn from the outdoors directly into the water heater intake, and exhaust must
terminate outside. There are three basic direct vent options detailed in this manual: 1. Side Wall Venting, 2. Roof Venting, and 3.
Unbalanced Venting.
Be sure to locate the heater such that the exhaust vent and intake pipe can be routed through the building and properly terminated.
Different vent terminals can be used to simplify and eliminate multiple penetrations in the building structure (see Optional Equipment in
Venting Section). The exhaust vent and intake pipe lengths, routing and termination methods must all comply with the methods and
limits given in the Venting section, Part 5 of this manual.
STOCK CODE
KGAVT0501CVT
KGAVT0601CVT
V500
V1000
WHL-001 REV. 9.3.14
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