Westinghouse WGR-076 Series Installation, Start-Up, Maintenance, Parts, Warranty page 24

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Figure 15 - Condensate Piping
NOTES:
1. Condensate line must be pitched at least ¼" per foot to
properly drain. If this cannot be done, or a very long length
of condensate hose is used, increase the condensate line to a
minimum of 1" ID and place a tee in the line after the condensate
neutralizer to properly reduce vacuum lock in the drain line.
2. PVC or CPVC pipe should be the only material used for
condensate line. Steel, brass, copper, and other metals will be
subject to corrosion or deterioration.
3. A frozen condensate line could result in a blocked vent
condition. It is very important to protect the condensate line from
freezing temperatures or any type of blockage. In installations
that may encounter sustained freezing conditions, the use of
heat tape is recommended to avoid freezing of the condensate
line. It is also recommended to bush up the condensate line size
to 1" and terminate condensate discharge as close to the unit as
possible. Longer condensate runs are more prone to freezing.
Damages due to frozen or blocked condensate lines ARE NOT
covered by warranty.
4. Support of the condensate line may be necessary to avoid
blockage of the condensate flow.
To ensure proper condensate neutralization it is recommended
to check the condensate neutralizer cartridge every two
years. Gently shake the cartridge to ensure it is still filled with
neutralization media. Replace the condensate neutralizer
cartridge if it is empty. Failure to do so could result in improper
condensate neutralization. Please note that if not properly
neutralized the slightly acidic condensate could corrode
materials subject to corrosion (metals, concrete, stonework,
etc.)
WHL-001 Rev. 3.16.15
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Figure 16 - Removing and Installing the Condensate Neutralizer