Connecting multiple units to one trap often allows air to be
pulled through one or more of the units, bypassing the trap
as well. Each unit should have its own individual trap, and
some equipment makers recommend against installing the
trap more than 4 feet away from the coil.
Many manufacturers and trap makers recommend using
removable caps on tees and crosses for cleaning purposes.
Although I wouldn’t call
out the lack of a clean-out
a defect, I would suggest
to your client to have one
added during the next ser-
vicing
(see photo opposite
page, bottom right).
Commercial equipment sometimes is operated in the cooling
mode, producing condensate even during winter. When tem-
peratures drop below freezing outside, traps may freeze and
break. Rooftop units and similar equipment can be especially
susceptible to trap freezing. In most residential applications,
there tends to be enough time between freezing weather
and the need to operate the HVAC equipment in the cooling
mode for water in the trap to evaporate before it has a chance
to freeze. But, if freezing is a concern in your area, recom-
mend freeze protection for the trap in the inspection report.
The pipe
My personal experience has shown me that condensate drain-
pipes get little attention during system installation. They
often are thrown in place as if they were an afterthought
or were of little consequence to the overall operation of the
system. This, of course, could not be further from the truth.
Keeping this in mind, home inspectors should pay close at-
tention to the pipe and fit-
tings during their work.
Over the years, PVC pipe
has become the condensate
drain material of choice
for residential applications
in many areas. The 2006
International Mechanical Code (IMC) also allows cast iron,
galvanized steel, copper, polybutylene, polyethylene, ABS
and CPVC to be used. Though it’s rare to see plastic pipe
insulated, sometimes it does need to be wrapped close to
the equipment where the coolest water is exiting the pan to
prevent it from sweating. With metal drains such as copper,
failure to insulate the pipe and trap almost can guarantee
a complete soaking of the surrounding surfaces from the
secondary condensation generated by the cool water flowing
through the drainpipe.
“My personal experience has shown
me that condensate drainpipes get little
attention during system installation.”
44
22
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CONDENSATE continued from page 21