TM 9-4120-399-14
PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS)
Section IV.
4-15. 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 cause
serious damage or complete failure of the equipment. Any effective preventive maintenance
program must begin with the indoctrination of operators to report all unusual conditions notes
during daily 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
When operating under unusual conditions, s u c h as a very dusty or sandy
conditions.
environment, it may be necessary to reduce the interval to monthly or even less if conditions are
extreme.
c. Table 4-2 lists the unit preventive maintenance checks and services that should be
performed at quarterly (or otherwise established) intervals. 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
Disconnect input power before disassembly of the air conditioner for
PMCS to prevent dangerous, possibly fatal, electrical shock.
Interval
Item
Item To Be
No.
Inspected
Procedure
1
Fresh Air
Remove and clean filter per para.
Ventilation
Filter
2
Remove any debris from louvers.
Intake
(return air)
Remove guards per para. 3-5 and clean
and Conditioned
Air Discharge
louvers.
Guard
