OPERATION IN EXTREME HEAT. - TM-5-4120-339-140022

TM 5-4120-339-14

CAUTION

Do not disturb the wiring during cold weather unless absolutely necessary. Cold

wiring and insulation is brittle and is easily broken.

2-6.

OPERATION IN EXTREME HEAT.

a. Extreme heat imposes an unusual load on the air conditioner. Do not set the selector switch to "COOL" if the

ambient (outside) temperature is in excess of 120F (49C).

b. Extra precautions must be taken to assure that the condenser air flow is not hampered by obstructions of the

air inlet grille. The condenser coil must be kept clean.

CAUTION

Do not restrict the flow of air at the intake and discharge openings of the unit.

Restrictions of air flow at these openings may cause damage to the unit.

c. Excessive ambient (outside) heat can cause the high pressure cut-out switch to trip during initial pulldown.

The reset button for the high pressure cut-out switch is located on the rear of the unit and is marked "HIGH PRESSURE

CUTOUT". (Refer to figure 2-2.). A few minutes should be allowed to elapse before pushing the reset button to allow the

system to cool down and lower the pressure.

2-7.

OPERATION IN DUSTY OR SANDY AREAS.

a. In very dusty or sandy areas, care must be taken to keep the air filter, evaporator coil and condenser coil fins

free of matter which would restrict the flow of air.

b. Coil fins should be inspected and cleaned when clogging is evident, using a fiber bristle brush.

The air filter should be removed from the unit and cleaned using a stream of fresh water.

2-8.

OPERATION UNDER RAINY OR HUMID CONDITIONS.

The air conditioner control panel must be protected to prevent direct contact with rain or heavy moisture.

2-9.

OPERATION IN SALT WATER AREAS.

a. Exposure to salt water and air may cause corrosion of exposed metal surfaces.

2-6