Exhaust Vent And Intake Pipe; Direct Vent Installation Of Exhaust And Intake; Indoor Combustion Air Installation In Confined Or Unconfined Space - Westinghouse WGR050NG076 Installation Instructions Manual


When raising the heater, fully support the entire bottom of the water heater.
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Locate or protect the heater so it cannot be damaged by a moving vehicle.
E. EXHAUST VENT AND INTAKE PIPE
The heater is rated ANSI Z21.10.3 Category IV (pressurized vent, likely to form condensate in the vent) and requires a special vent
system designed for pressurized venting.
NOTE: The venting options described here (and further detailed in Venting, Part 5 in this manual) are the lone venting options
approved for this water heater. Failure to vent the water heater in accordance with the provided venting instructions will void
the warranty.
Failure to vent the water heater properly will result in serious personal injury or death.
Do not attempt to vent this water heater by any means other than those described in this manual. Doing so will void the warranty, and
may result in severe personal injury or death.
Vents must be properly supported. Heater exhaust and intake connections are not designed to carry heavy weight. Vent support
brackets must be within 1' of the heater and the balance at 4' intervals. Heater must be readily accessible for visual inspection for the
first 3' from the heater.
The exhaust discharged by this water heater may be very hot. Avoid touching or other direct contact with the exhaust gases or the vent
termination assembly. Doing so may result in product damage, severe personal injury, or death.

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 piping 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 piping lengths, routing and termination methods must all comply with the methods and
limits given in the Venting section, Part 5 of this manual.
When installing a combustion air intake from outdoors, care must be taken to utilize uncontaminated combustion air. To prevent
combustion air contamination, see Table 1 – Contaminant Table.

2. INDOOR COMBUSTION AIR INSTALLATION IN CONFINED OR UNCONFINED SPACE

This heater requires fresh, uncontaminated air for safe operation and must be installed in a mechanical room where there is adequate
combustion and ventilating air. NOTE: To prevent combustion air contamination, see Table 1 – Contaminant Table.
Combustion air from the indoor space can be used if the space has adequate area or when air is provided through a duct or louver to
supply sufficient combustion air based on the water heater input. Never obstruct the supply of combustion air to the water heater.
If the water heater is installed in areas where indoor air is contaminated (see Table 1) it is imperative that the water heater be installed
as direct vent so that all combustion air is taken directly from the outdoors into the water heater intake connection.
Unconfined space is space with volume greater than 50 cubic feet per 1,000 Btu/hour (4.8 cubic meters per kW) of the total input
rating of all fuel-burning appliances installed in that space. Rooms connected directly to this space, through openings not furnished with
doors, are considered part of the space. See
Confined space is space with volume less than 50 cubic feet per 1,000 Btu/hour (4.8 cubic meters per kW) of the total input rating of
all fuel-burning appliances installed in that space. Rooms connected directly to this space, through openings not furnished with doors,
are considered part of the space.
When drawing combustion air from inside a conventionally constructed building to a confined space, such space should be provided
with two permanent openings: one located 6" (15 cm) below the space ceiling, the other 6" (15cm) above the space floor. Each opening
should have a free area of one square inch per 1,000 Btu/hr (22cm
than 100 square inches (645cm
, p. 34 for details.
Figure 14
2
).
2
/kW) of the total input of all appliances in the space, but not less
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WHL-001 REV. 9.3.14