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ARMY TM 9-4120-381-14
NAVY EE-000-CA-MMA-010/7053-AC
AIR FORCE TO 35E9-136-31
Section IV. OPERATION UNDER UNUSUAL CONDITIONS
2-15.
GENERAL. The air conditioner is designed to operate normally within a wide range of climatic conditions.
However, some extreme conditions require special operating and servicing procedures to prevent undue loading and
excessive wear in the equipment.
2-16.
OPERATION IN EXTREME HEAT. The air conditioner is designed to operate in temperatures up to 125°F
(52°C). Extra care should be taken to minimize the cooling load when operating in extremely high temperatures. Some
of the steps that may be taken are:
NOTE
Weather stripping, the installation of storm doors and windows (if appropriate), and
insulation of surfaces exposed to the outside is recommended when operating in
extremely high temperatures for extended periods is anticipated.
a.
Check all openings in the shelter or enclosure, especially doors and windows, to be sure they are tightly
closed. Limit in and out traffic, if possible.
b.
When possible, use shades or awnings to shut out direct rays of the sun.
c.
Limit the use of electric lights and other heat producing equipment.
d.
Limit the amount of hot, outside air introduced through the fresh air inlet to that needed for ventilation.
2-17.
OPERATION IN EXTREME COLD. The air conditioner is designed to operate in temperatures down to -40°F (-
40°C). Extra care should be taken to minimize the heating load when operating in extremely low temperatures. Some
steps that may be taken are:
CAUTION
Do not disturb electrical wiring that has been exposed to extremely low
temperatures. Both the wire and insulation become brittle when cold and are easily
broken.
Before operating the air conditioner, ensure that MODE SELECT SWITCH is in the
OFF position and that ac power has been applied to air conditioner for at least 30
minutes (can take up to 24 hours). This is necessary so that the crankcase heater
has sufficient time to operate. Heating the compressor is necessary to remove all
liquid refrigerant from the crankcase thereby eliminating the possibility of damage
during starting operations at low ambient temperatures.
If compressor begins to slug, turn MODE SELECT SWITCH to OFF, wait a few
minutes, then turn MODE SELECT SWITCH to AUTO position. Turning the MODE
SELECT SWITCH to OFF then to AUTO mode prevents the compressor from
slugging, thereby eliminating the possibility of damage during starting operations at
low ambient temperatures.
NOTE
Weather stripping, the installation of storm doors and windows, (if appropriate), and
insulation of surfaces exposed to the outside is recommended when operating in
extremely low temperatures for extended periods is anticipated.
2-14
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