TM 9-4120-370-14
TO 35E9-229-1
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 on the equip-
ment.
2-16. OPERATION IN EXTREME HEAT
NOTE
Unit Preventive Maintenance Checks and Services (PMCS) should be performed at dai-
ly intervals.
a.
General. The model F36T4-2S, F36T4-2SA, and F36T-2S air conditioners are designed to operate in tempera-
tures up to 120F (49C). The models F36T4-2SB and F36T-2SA air conditioners are designed to operate in
temperatures up to 125F (52C). Extra care should be taken to minimize the cooling load when operating in
extremely high temperatures.
Protection.
b.
(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 in-
sulation of surfaces exposed to the outside is recommended when operating in extreme-
ly 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 wiring that has been exposed to extremely low tempera-
tures. Both the wire and insulation become brittle when cold and are easily bro-
ken.
The air conditioner is designed to operate at temperatures down to -50F (-45C). 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
Weatherstripping, the installation of storm doors, and windows, if appropriate, and in-
sulation of surfaces exposed to the outside is recommended when operating in extreme-
ly high temperatures for extended periods.