OPERATION IN EXTREME HEAT - TM-5-4120-356-140024

TM 5-4120356-14

50 F (10 C), set the selector switch knob to "VENTILATE".

NOTE

The air conditioner can be operated on the heating mode

in ambient temperatures as low as -50 F.

c. Make sure that the electrical system is free of ice and moisture.

CAUTION

Do not disturb the wiring during cold weather unless

absolutely necessary. Cold wiring and insulation is

brittle and is easily broken.

26.

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.

2-7.

OPERATON IN DUSTY OR SANDY AREAS

NOTE

Unit Preventive Maintenance Checks and Services

(PMCS) should be performed at daily intervals.

2-6

Change 2