TM 9-4120-398-14
Section IV. OPERATING UNDER UNUSUAL CONDITIONS
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.
The air conditioner is designed to operate in temperatures up to 120 F
2-16. OPERATION IN
EXTREME HEAT.
(48.9C). 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 shutout 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
Weatherstripping, 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.
2-17. OPERATION IN
EXTREME COLD
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 F (-45 C). Extra care should be taken to minimize the
heating load when operating in extremely low temperatures. Some of the steps that maybe taken are:
a. Check all openings in the enclosure, especially doors and windows, to be sure they are tightly closed. Limit in and out
traftic, if possible.
b. Open shades and awnings to permit entry of direct rays of the sun, if appropriate.
c, Limit the amount of cold, outside air introduced through the fresh air damper to that needed for ventilation.