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TM 5-4120-387-14
2-18. OPERATION IN DUSTY OR SANDY CONDITIONS
NOTE
Unit preventive Maintenance Checks and Services (PMCX) should be
performed at daily intervals.
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.
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
2-19. 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.
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