TM 9-4120-403-14
Section IV OPERATING 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 on the
equipment.
2-16. OPERATION IN EXTREME HEAT
The air conditioner is designed to operate in temperatures up to 120OF (48. 90C). 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:
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 damper to that needed for ventilation.
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. e. Perform Unit PMCS daily.
2-17. OPERATION IN EXTREME COLD
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. The air conditioner is designed to operate in
temperatures down to -50 (-45 ). Extra care should be taken to minimize the heating load when
F
C
operating in extremely low temperatures. Some of the steps that may be taken are:
a. Check all openings in the enclosure, especially doors and windows, to be sure they are tightly closed. Limit in
and out traffic, if possible.
2-26