TM 9-4120-405-13&P
2-19. OPERATION IN EXTREME COLD. When operating the air conditioner and generator set in temperatures down to
-50F (-45 C), extra care should be taken to minimize the heating load. Some of the steps that may be taken are:
a. Air Conditioner.
CAUTION
Do not disturb electrical wiring that has been exposed to extremely low
temperatures. When exposed to cold, both the wire and insulation become brittle
and can be easily broken.
(1) Check all openings in the enclosure, especially doors and windows, to be sure they are tightly closed. Limit
in and out traffic, if possible.
(2) Open shades and awnings to permit entry of direct rays of the sun, if appropriate.
NOTE
Weather stripping, the installation of storm doors and windows (if appropriate),
and insulation of surfaces, exposed to, the outside is recommended when
operation at extremely low temperatures for extended periods is anticipated.
b. Generator Set.
(1) Use correct lubricating oil in engine crankcase for temperature conditions, refer to TM 5-6115-585-12.
Change oil only when engine is warm.
(2) Use Arctic Grade diesel fuel.
(3) Keep batteries in a well-charged condition.
(4) Be certain air cleaner intake control is in cold weather position.
(5) Shutter blades should be fully closed for cold engine, open only partially under light load, open more as
load increases.
(6) Hold master switch in START position for 2 minutes after engine comes to operating speed.
c. Trailer.
(1) Be careful when placing the trailer in motion after a shutdown. Congealed lubricants can cause part failure.
(2) Tires may be frozen to the ground. If tires were under-inflated, they may have flat spots.
(3) If brake shoes are frozen to the brake drums, use a torch to heat drums.
(4) Refer to FM 207 and FM 21-305 for special instructions on driving hazards that may be encountered during
extreme cold weather conditions.
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