OPERATION IN DUSTY OR SANDY CONDITIONS

TM 9-4120-370-14

TO 35E9-229-1

2-18. OPERATION IN DUSTY OR SANDY CONDITIONS

NOTE

Unit Preventive Maintenance Checks and Services (PMCS) should be performed at dai-

ly intervals.

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 the compressor compartment may cause overheating of the refrigeration

system. Dust or sand may also clog the condensate trap and water drain lines.

Never operate the air conditioner without having the alr 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.

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 com-

ponents.

(3) In extreme conditions, daily cleaning of condenser, filters, and outside grilles maybe necessary.

2-19. OPERATION IN UNUSUALLY WET CONDITIONS

The air conditioner is designed for normal exposure to the elements, so it is reasonably waterproof. Some of the steps

that should be taken in an extremely wet climate are:

More frequent inspection and cleaning of the mist eliminator, condensate trap, and drain lines to insure proper

drainage and prevent accumulation of water inside the cabinet.

b. Roll down and secure the fabric cover on the back of the cabinet during periods of wet, windy weather when

the air conditioner is not in operation.

Roll up and secure the fabric cover during dry spells when the air conditioner is not in operation so that the

interior can dry out and condensation will not accumulate.

2-20. OPERATION IN SALT AIR OR SEA SPRAY

Salt air or sea spray may cause many of the same clogging problems as encountered when operating in a dusty or sandy

environment. In addition, the nature of salt presents serious corrosion problems. Frequent cleaning is necessary during

which all exposed surfaces should be thoroughly spray rinsed or sponged with freshwater to remove salt. The fabric cover

on the back of the cabinet should be rolled down and secured during all periods when the air conditioner is not in operation.