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TM 5-4120-377-14
2-18. OPERATION IN DUSTY OR SANDY CONDITIONS
Dusty and sandy conditions can seriously reduce the efficiency of the air conditioner by clogging the air filters
and thereby causing a restriction of 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 mist eliminator, condensate trap, and water drain lines. Some of the steps that may be taken are:
a. Frequent cleaning of filters and all other areas of dust and sand accumulation. In extreme conditions,
daily cleaning of filters may be necessary.
b. Limit the amount of dusty or sandy outside air introduced through the fresh air damper to that essential
for ventilation.
c. Roll down and secure the fabric cover on the back of the cabinet during periods of shut-down.
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:
a. 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.
c. 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
fresh water 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.
2-24
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