TM 9-4120-402-14
4-6.
INPUT POWER CABLE.
a.
Determine length.
b.
Fabricate input power cable. (See appendix F, figure F-50.)
Section IV UNIT PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS)
4-7.
INTRODUCTION, INSPECTION, AND SERVICE.
a.
Systematic, periodic, preventive maintenance checks and services (PMCS) are essential to insure that the
air conditioner is ready for operation in any mode 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 training of operators to report all unusual
conditions noted 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 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 4-2 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. The paragraph
reference column on the right side of the table provides the paragraph number where detailed, step-by-step
disassembly/reassembly maintenance procedures may be found. The item number column will be used as a source of
item numbers for the TM Number Column on DA Form 2404.
WARNING
Disconnect input power before disassembly of the air conditioner for PMCS to prevent
dangerous, possibly fatal, electrical shock.
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