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TM 5-4120-376-14
2-11. OPERATION IN DUSTY OR SANDY CONDITIONS.
N O TE
Unit Preventive Maintenance Checks and Services (PMCS) 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.
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.
2-12. OPERATION UNDER RAINY OR HUMID CONDITIONS.
CAUTION
Make sure power is disconnected from air conditioner before touching any
wiring or other electrical parts.
a. Keep unit clean and dry.
b. Cover unit when not in use.
c. Remove cover during dry periods and allow unit to dry.
2-13. OPERATION IN SALT WATER AREAS.
CAUTION
Disconnect power source before washing air conditioner.
a. Rinse with clean water and dry as much of unit as possible to prevent corrosion.
b. Cover unit when not in use.
2-14. OPERATION IN HIGH ALTITUDES.
a. The operating efficiency of the unit will be reduced at higher altitudes.
b. The unit is designed to operate in altitudce up to 5000 feet.
* U.S. GOVERNMENT PRINTING OFFICE 1991 554-123/20240
2-12 Change 4
PIN: 057943-004
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