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CAUTION
TM 5-4120-387-14
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
NOTE
Unit Preventive Maintenance Checks and Services (PMCS) should be
performed at daily intervals.
a. General. The air conditioner is designed to operate in temperatures up to 120°F (49°C).
Extra care should be taken to minimize the cooling load when operating in extreme high temperatures,
b. Protection.
(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)
When appropriate, use shades or awnings to shut out direct rays of the sun
(3)
When possible, limit the use of electric lights and other heat producing equipment
(4)
Limit the amount of hot, outside air introduced through the fresh air damper to that essential
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.
c. Cleaning.
(1)
Clean outside grilles, coils, filters, and mist eliminator more frequently
2-17. OPERATION IN EXTREME COLD
Do not disturb electrical wrong 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.
Change 3
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