KCM Series Manual 37
Condensate can form in high eciency direct vent
appliances. Without proper drainage, condensate will
damage the heat exchanger.
To prevent condensate damage, follow these
instrucons.
Do not connect the condensate drain pipe directly
to the rain sewer.
Do not connect the condensate drain line with an
air condioning evaporator coil drain.
Use only venng that is approved and idened as
acceptable for your parcular model.
Slope the venng toward the appliance according
to the vent manufacturer’s installaon
instrucons.
All condensate must drain and be disposed of
according to local codes.
Use only corrosion resistant materials for the
condensate drain lines such as PVC pipe or plasc
hose.
The condensate drain pipe (along its enre length)
must be at least the same diameter as the drain
line, (1/2 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 in outdoor
units, run the condensate drain line through an
interior wall or between insulaon and an interior
wall.
It is recommended that the condensate trap drain
line be insulated. A frozen condensate trap results
in a diagnosc code 25.
□ Verify proper clearances around the vents and air
intakes.
□ For indoor models, ensure SW4 in DIPSW2 is set
to the appropriate venng style.
□ Ensure you have used the correct venng
products for the model installed and that you
have completely followed the venng
manufacturer’s installaon instrucons and these
installaon instrucons.
□ Verify that the vent system does not exceed the
maximum length for the number of elbows used.
Water heaters have an integrated condensate
collector.
Regions of cold climate will create more
condensate in the vent system.
The condensate drain pipe should be as short as
possible and have a downward pitch.
If the condensate drain gets blocked, a diagnosc
code will display on the controller or status
monitor. If this occurs, the condensate drain must
be cleaned.
The condensate trap will automacally prime (self-
prime) during operaon of the unit as condensate
forms. Condensate draining from the unit
indicates that the trap is full and that there is no
blockage in the condensate drain. It is not
necessary to add water to the condensate trap.
A condensate neutralizer kit, 804000074, is
available from Rinnai. The kit allows condensate
to ow through neutralizing media that raises the
pH of the condensate to a level that will help
prevent corrosion of the drain and public sewer
system.
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