OPERATION UNDER RAINY OR HUMID CONDITIONS

TM 5-4120-356-14

a. General. Dusty and sandy conditions can seriously reduce the efficiency of the air

conditioner by clogging the air filter, mist eliminator, and coils. This will cause a restriction in the

volume of airflow. Accumulation of dust or sand in the condenser coil and/or in the compressor

compartment may cause overheating of the refrigeration system. Dust or sand may also clog the

condensate trap and water drain lines.

CAUTION

Never operate the air conditioner without having the air

filters in place.

b. Protection.

(1) Shield the air conditioner from dust as much as possible.

(2) Take advantage of any natural barriers which offer protection.

(3) Limit the amount of dusty or sandy outside air introduced through the fresh air

damper.

(4) Roll down and secure the fabric cover on the back of the cabinet during periods of

shutdown.

c. Cleaning.

(1) Keep the air conditioner as clean as possible.

(2) Pay particular attention to the outside grilles, condenser, filters, mist eliminator,

louvers, and electrical components.

(3) In extreme conditions, daily cleaning of condenser, filters, and outside grilles may

be necessary.

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.

[OPERATlON IN SALT WATER AREAS

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

b. Wash down the exterior of the unit with clean fresh water at frequent intervals. Take

care not to damage electrical components with water.

c. Inspect the unit daily and clean the evaporator and condenser coils and the air filter as

often as required to maintain proper operation.

2-10. OPERATION AT HIGH ALTITUDES

The air conditioner is designed to operate without special attention at altitudes up to 5,000 feet.

2-7/(2-8 blank)

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* U.S. GOVERNMENT PRINTING OFFICE: 1991 554-123/20229