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TM 9-4120-389-14
SECTION III. PREVENTIVE MAINTENANCE
CHECKS AND SERVICES (PMCS)
4-9. INTRODUCTION, INSPECTION, AND SERVICE
a. Systematic, periodic, Preventive Maintenance Checks and Services (PMCS) are essential to ensure that
the air conditioner is ready for operation at all times. The purpose of a preventive maintenance program is to
discover and correct defects and deficiencies before they can seriously damage or cause complete failure of
the equipment. Any effective preventive maintenance checks or actual operation to Unit Maintenance. All
defects and deficiencies discovered during maintenance inspections must be recorded, together with corrective
action taken, on DA Form 2404 (Equipment Inspection and Maintenance Worksheet).
b. A schedule for Unit preventive maintenance inspection and service should be established immediately
after installation of the air conditioner. A quarterly interval, equal to three calendar months or 250 hours of
operation (whichever occurs first) is recommended for usual operating conditions. When operating under
unusual conditions, such as a very dusty or sandy environment, it may be necessary to reduce the interval to
monthly or even less if conditions are extreme.
c. Table 4-1 lists the unit preventive maintenance checks and services that should be performed at
quarterly intervals (or otherwise stated in table 4-1). The PMCS items in the table have been arranged and
numbered in a logical sequence to provide for greater personnel efficiency and least amount of required
maintenance downtime.
WARNING
Voltages used can kill. Always disconnect power cord to air conditioner before
performing any internal maintenance. Shutting unit off at its control panel does
not disconnect unit power.
4-13
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