Intake Pipe And Exhaust Vent Guidelines - Westinghouse WGRT 150 Series Installation Start-Up Maintenance Parts

A. INTAKE PIPE AND EXHAUST VENT GUIDELINES
1. Vent system must be installed in accordance with local codes, or, in absence of local codes, the National Fuel Gas Code, ANSI
Z223.1 / NFPA 54 and/or CSA B149.1, Natural Gas and Propane Installation Code.
2. For installation in Canada, installer supplied plastic vent piping must comply
with CAN/CGA B149.1 and be certified to the Standard for Type BH Gas Venting
Systems, ULC-S636. Components of this listed system must not be interchanged
with other vent systems or unlisted pipes or fittings. All plastic components and
specified primers and glues must be from a single system manufacturer and must
not be intermixed with another system manufacturer's products. Clean and dry all
applicable surfaces before applying cement.
3. This water heater is designed to be installed in a power vent (using indoor air for
combustion and vented to the outdoors) type, or as a direct vent (sealed
combustion) type. In power vent installations, indoor air is used for combustion and
exhaust gases are vented directly to the outdoors through a sealed exhaust vent
piped through the wall or roof. In direct vent installations, combustion air must be
supplied directly from the outdoors to the burner, and the flue (exhaust) gases
should be vented directly to the outdoors through the wall or roof.
4. This water heater uses 2" or 3" diameter pipe for exhaust vent and intake pipe. It
is important to ensure an airtight seal from the water heater collar to the vent
terminations. It is EXTREMELY IMPORTANT that the maximum allowed combined
venting lengths are not exceeded. See Table 12 for a list of Approved Vent Materials and Table 13 for Approved Vent Lengths.
5. Do not install venting system components on the exterior of the building except as specifically required by these instructions.

Vent terminals must be at least 1 foot from any door, window, or gravity inlet into the building.

Maintain the correct clearance and orientation between the exhaust vent and intake pipe terminals.

The exhaust vent and air intake terminals must be at the same height and their center lines must be spaced apart 1 foot
minimum.

The bottom of the exhaust vent and intake pipe terminals must be at least 1 foot above the normal snow accumulation level. In
no case should these terminals be installed less than 1 foot above normal snow accumulation level.

Do not install the exhaust vent terminals directly above windows or doors.

Intake pipe terminal must not terminate in areas that might contain combustion air contaminants, such as near swimming
pools.

For sidewall venting, the minimum horizontal distance between adjacent exhaust vent terminations is 1 foot. It is
recommended this distance be greater than 1 foot to better avoid frost damage to building surfaces.

For roof venting, minimum horizontal distance between any adjacent exhaust vent termination is 1 foot.

If the exhaust vent is to be terminated in a walled off area (such as a roof with a parapet wall), ensure the exhaust vent
terminates a minimum of 10' from nearest wall and extends level with or above the top of the wall. This will ensure flue gas
does not get trapped and possibly recirculated into the intake air pipe, which could contaminate the combustion air.
All joints of positive pressure vent systems must be sealed completely to prevent leakage of flue products into living space.

Remove all burrs and debris from joints and fittings.

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.

Ensure the vent is located where it will not be exposed to prevailing winds.

In all roof venting applications, exhaust discharge must point away from the pitch of the roof.

To prevent water leakage, install adequate roof flashing where the pipe enters the roof.

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.

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.

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.

The exhaust vent must terminate where vapors cannot make accidental contact with people or pets, or damage shrubs or
plants.

In vacant chimney applications, install and seal a rain cap over existing chimney openings.

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.
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WHL-004 REV. 5.26.17