9
1.8. M22A and M33C Condensate Drain Test
Procedure
CAUTION
Make sure that drain piping is properly routed and insu
-
lated in order to prevent both leaks and condensation.
IMPORTANT
Drain should have a slope of at least ¼ inch per foot and
should be approved corrosion-resistant pipe. You must
confirm operation of every drain and pump in the system
as part of the commissioning procedure.
1.
Use a field-provided hose clamp to secure the drain line
stub on the side of the cassette base to a field-supplied
1” (25 mm) drain line.
NOTE:
Take care not to over-tighten the hose clamp as
this may damage the drain line stub.
2.
See figure below for applications using the unit’s internal
condensate pump to provide lift into a drain. Ensure that
the main drain line is properly sloped (no less than 1/4
inch per foot (18 mm per m)).
3. Drain should be as short as possible and should not have
any droops or kinks that would restrict condensate flow
and shall be approved resistant pipe.
NOTE:
There must be a 2-inch (51 mm) space between
the end of the condensate drain and the final
termination point (ground, open drain, etc.) to
ensure that the line will drain freely.
After system installation is complete, the condensate
drain line must be checked for leaks and the condensate
pumps must be checked to ensure proper operation.
This check is part of the commissioning sequence. Pour
water into the evaporator drain pan to ensure proper
condensate drainage. See figure right. If a leak is found,
shut down power to the unit at once and do not restore
power to the unit until the problem has been resolved.
Drain Plug
Drain Pan
Cassette Base
Pour water
here for test
Cap
(Remove for test)
Figure 3. Condensate Drain Test
Cassette
Unit
7-7/8in.
2~3-15/16 in.
Drain
(slope of at least ¼ inch per foot)
Max.
28"
3 ft. (1 m)
SUPPORT
STRAPS
Figure 4. Indoor Unit Condensate Drain
