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2-15.
TM 5-4120-377-14
Section IV OPERATION UNDER UNUSUAL CONDITIONS
The Model F18T4-2S and Model 3788 Air Conditioners are 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 125°F (51.6°C). Extra care should be taken to
minimize the cooling bad 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.
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 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.
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.
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.
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