PS Magazine - TB 43-PS-698

PS, The Preventative Maintenance Monthly

ISSUE 698

JANUARY 2011
PS Magazine - TB 43-PS-698 - Page 6 of 33
8
PS 698
JAN 11
s
tewart-Warner and Hupp
personnel heaters have been
around so long that most combat
vehicle crewmen have the start-
up procedures memorized. And
if you forget, most vehicles
have a decal mounted right
above the heater panel that tells
you what to do.
The instructions say to hold
the RUN-OFF-START switch
down to the START position
until the indicator light comes
on. That can be as long as 2
minutes for the Stewart-Warner
and as long as 4 minutes for the
Hupp.
Easy, huh? But what happens
if your old heater has been
replaced with the A-20 heater,
To start the A-20
heater the right way,
hold the RUN-OFF-
START switch on
START for 4 seconds,
then fip it to RUN. The
heater will go through
a quick self-diagnosis
and then start.
If it doesn’t, check out the troubleshooting procedures in TM 9-2540-207-14&P.
If your vehicle is an M1A2 SEP or M2/M3-series Bradley, refer to your TMs for
vehicle-unique starting instructions.
So make sure you
Fnd out what heater
your vehicle has
before
trying to start it. If it’s the
A-20, ignore the decal
instructions. Better yet,
scrape off the decal so you
and others aren’t fooled
into trying to start the A-20
heater the wrong way.
If you hold the
A-20’s switch
down for just 10
seconds, the heater
automatically goes
into a 4-minute purge
cycle to prevent
fooding. The heater’s
fuel supply is cut off
and all remaining fuel
inside the heater is
burned off.
If you hold it down
even longer, the
igniter can be fooded
and ruined.
Personnel Heaters…
heater
won’t
heat?
in most cases, drivers
try to start it the same
way. And
that’s
where
the trouble starts.
For A-20,
hold switch
to START for
4 seconds,
then flip to
RUN
Don’t
follow decal instructions for A-20 start-up
Man, it’s
cold!
That
personnel
heater will
sure feel
good!
Otherwise, we’re
both
in for a
long, cold day!
Only if
you start
it
right!
698.08-09.indd
1-2
12/6/10
11:46 AM
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