PS Magazine - TB 43-PS-619
PS, The Preventative Maintenance Monthly
ISSUE 619
JUNE 2004
PS 619
JUN 04
41
F18H-MPI, AC Unit…
I
t’s dark and it’s your job to shut off the 18,000 BTU horizontal air conditioner,
F18H-MPI, NSN 4120-01-327-1316. You turn the MODE switch all the way clock-
wise to the end position and head for some serious sack time.
The next morning, your AC unit is NMC because the heater blower that was run-
ning all night has gone kaput!
What went wrong?
Well, the switch fooled you
as it has a lot of folks. Turning
the switch all the way to the
end position should turn it off.
That’s how most switches
work. But not this one. The end
position turns on the heater
blower. The OFF position is
the stop before the last stop.
There’s only one way to prevent this from happening and that’s by educating your
operators. Show ‘em the switch in the light of day and let ‘em know about the prob-
lem.
One more tip: Tell them when they shut down the AC to listen. If they hear some-
thing running—like a blower motor—chances are they stopped too late!
PS 619
JUN 04
40
MEP-802A,-803A…
Dear MSG Half-Mast,
Could you verify something I know, but can’t get some guys to believe?
On the 5-KW and 10-KW
generators used as part of the
MEP-802A and -803A, I
believe that keeping the
access doors closed keeps
the generators cooler. I think
the generators were designed
to have air flow pass over
them and help cool them when
the doors are closed.
Some guys want to keep the
doors open. They think that
keeps the engine cooler. They
also say that the only thing in
the TM about keeping the
doors closed is to keep the
noise down.
So, who’s right?
SSG Matthew J. Zweibohmer
234th Sig Bn
Iraq
Dear Sergeant Zweibohmer,
You are right!
Keep the access doors on your gener-
ators closed. This keeps the generator
cooler, keeps down the noise, and keeps
the interior of the generator cleaner.
what’s wrong
with him? I
thought you
said he’d be
cooler.
Keep doors
closed!
MODE
TEMPERATURE
FAULTS
WARM
COOL
TEMPERATURE
PRESSURE
OVER
CURRENT
OVER/UNDER
VOLTAGE
HOT MOTOR
CONTROLLER
HEAT
OFF
RESET
VENT
COOL
No one’s getting
cool today—the
dadblamed thing
is NMC!
hmmm…
lessee,
“OFF”
is probably
the upper
setting…
nothing
burns me up
like open
doors!
Why was
this AC unit
turned to
heat!?
keeping your cool
619. 40-41 (C)
4/29/04
5:31 PM
Page 1
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