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Condensate
Condensate can form in the vent of high efficiency
direct vent appliances. Without proper drainage,
condensate will damage the heat exchanger.
To prevent condensate damage, follow these
instructions.
DO NOT
•
Do not allow condensate to enter the water
heater.
•
Do not connect the condensate drain pipe directly
to the rain sewer.
•
Do not connect the condensate drain line with an
air conditioning evaporator coil drain or.
•
Do not connect the condensate drain line to the
pressure relief valve/line of the appliance.
MUST DO
•
Use only venting that is approved and identified as
acceptable for your particular model.
•
For vertical terminations, install a condensate drain
and trap as close as possible to the appliance.
•
Slope the venting 1/4" per foot toward the
appliance according to the vent manufacturers
installation instructions. Dispose of condensate per
local codes.
•
All condensate must drain and be disposed of
according to local codes.
•
If the condensate collector is not used, the drain
pipe must be capped to prevent exhaust gases and
condensate from entering the building. The cap is
supplied on the appliance. In such an instance
slope the venting 1/4" per foot away from
appliance according to vent manufacturer's
installation instructions.
•
Use only corrosion resistant materials for the
condensate drain lines such as PVC pipe or plastic
hose.
•
The condensate drain pipe (along its entire length)
must be at least the same diameter as the drain
line, (5/8 inch NPT).
•
The end of the condensate drain pipe should be
open to the atmosphere. The end should not be
under water or other substances.
•
To minimize freezing of the condensate, run the
condensate drain line through an interior wall or
between insulation and an interior wall.
•
The condensate collector should be used for all
combination domestic/hydronic heating
applications.
INFORMATION
•
A condensate trap is available, P/N 222053.
•
Regions of cold climate will create more
condensate in the vent system. The condensate
collector should be used in cold climates.
•
The condensate drain pipe should be as short as
possible and have a downward pitch.
Checklist for Venting and
Condensate (indoor models only)
□
Verify proper clearances around the vent
terminations and air intakes.
□
Ensure you have used the correct venting
products for the model installed and that you
have completely followed the venting
manufacturer's installation instructions and these
installation instructions.
□
Verify that the vent pipe has a downward slope or
grade to the outside of 1/4 inch per foot (1.2° )
OR if the vent pipe is sloped toward the water
heater (as some local codes require), that a
condensate collector is installed to allow
condensation to drain away from the water
heater to a proper drain source.
□
Verify that condensate will not be allowed to
drain back into the water heater.
□
Verify that the vent system does not exceed the
maximum length for the number of elbows used.
Demand Duo™ 80
19
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