PS Magazine - TB 43-PS-587

PS, The Preventative Maintenance Monthly

ISSUE 587

OCTOBER 2001
PS Magazine - TB 43-PS-587 - Page 11 of 32
If the heater won’t start when you do it the right way, check out the
troubleshooting procedures in TM 9-2540-207-14&P. While you’re
waiting for the new TM to arrive, check it out on-line at
If your vehicle is an M1A2
SEP (System Enhancement
Program) or M2/M3
Bradley, refer to your
TMs for vehicle-unique
starting instructions.
PS 587
20
Personnel Heaters…
A-20 HEATER WON’T START?
you can’t
start me like
a
stewart-
warner
or
a
hupp.
I’m
different!
T
he Stewart-Warner and Hupp person-
nel heaters have been around so long
that most combat vehicle crewmen have
the start-up procedures memorized.
You can hold the RUN-OFF-START
switch to START for up to 2 minutes for
the Stewart-Warner and no longer than 4
minutes for the Hupp. If the heater
won’t start in that time, you have to let it
cool down or risk burning out the ignitor
or ignition control resistor.
But those start-up procedures will
cause no end of trouble if you try to use
‘em on the new A-20 Global heater,
After holding the switch on START
for just 10 seconds, the heater automati-
cally goes into a 4-minute purge mode.
The heater’s fuel supply is cut off and
all remaining fuel inside the heater is
burned off.
Because the heater doesn’t start,
most operators assume it’s defective
and turn it in for repair.
But the heater’s not the problem! It’s
the improper start-up procedure that
causes all the trouble.
A-20 Global Personnel Heater…
Remove Before Welding
T
he brains of the A-20 Global personnel
heater are its electronic circuit boards.
That’s why it’s so important to
remove
the heater from your vehicle before
doing any welding.
If you don’t remove it, transient cur-
rent from the welder travels through the
hull of your vehicle to the heater and
destroys the circuit boards.
OCT 01
21
Here’s how
to start me
correctly!
c’mon!
It’s not
my
fault!
“hold the
run-off-start
switch on
start
for 5 seconds…”
“…then flip
it to
run
.”
“The heater
will go
through a
quick self-
diagnosis and
then start.”
587. 20-21 (C)
9/3/01
6:56 PM
Page 1
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