PS Magazine - TB 43-PS-716
PS, The Preventative Maintenance Monthly
ISSUE 716
JULY 2012
47
PS 716
JUL 12
When you operate the environmental control unit (ECU) on COOL mode,
open the bafFe on the return duct port.
You see, the ECU is always stored or transported with the bafFe closed. That helps
keep debris out of the return duct and air ±lters.
The problem comes when some Soldiers run the ECU in COOL mode without
opening the bafFe. When this happens, not enough air passes through the return duct,
across the evaporator coil (where it’s cooled) and out the supply duct.
Without enough air Fow, the evaporator coil starts to freeze up. As the freezing
continues, less and less air Fows across the coil. ²inally, no air moves across it at
all—and no cool air goes into the shelter. Run the ECU too long in this condition and
you’ll damage the compressor or fan components.
Points of Contact
ECU General Startup Reminders
1.
Remove both duct caps.
2.
Completely open the bafFe on the return duct.
3.
Inspect the air filters.
4.
Install the return and supply ductwork.
5.
Make sure nothing blocks air Fow to and from
the ECU. Don’t put clothing and gear on top of
the fan or against the coils and louvers.
6.
On the control panel, set the MODE SELECT
switch to COOL.
1.
Shut off power to the ECU.
2.
Inspect the air filters. If they’re dirty and clogged,
they’ll block air Fow and cause the evaporator coil to
freeze. Clean or replace filters as needed.
To clean the filter, wash it in warm water and a
mild detergent. Rinse it thoroughly in clean water.
Then let it air-dry. Never use a high-pressure washer;
that can damage the filter. You can also clean
the filter with compressed air. But again, no high
pressure.
There are no replacement filters in the Army supply
system. To replace the filter, you need to contact DHS
Systems LLC, the company that makes DRASH shelters.
DHS points of contact are listed at the end of this
article. The filter’s DHS part number is PECU05T38.
3.
Completely open the bafFe on the return duct.
4.
Wait a full 30 minutes with the ECU power off. This
allows time to equalize the refrigerant temperature
and pressure in the evaporator and condenser. It also
lets the evaporator thaw.
5.
After 30 minutes, adjust the thermostat to around
70°±. Then power up the ECU.
Phone:
(877) 463-7274 or (850) 537-9947
Or email:
customersupport@drash.com
before
you
start up the
ecu to battle
summer heat,
remember
to…
so, if the ecu is
already up and running
in the cool mode,
but the shelter’s
not
getting cooler, try
this remedy…
need
more
help?
here are points
of contact for
any
issues concerning
drash.
there’s also a
website supporting
drash products:
Before setting ECU to cool mode…
Remove duct caps before starting ECU
…open bafFe on return duct
716 46-47.indd
1-2
5/25/12
11:26 AM
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