AIR CONDITIONER, HORIZONTAL, COMPACT
PREVENTIVE MAINTENANCE CHECKS AND SERVICES
Systematic, periodic, Preventative 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 preventative maintenance program is to discover and correct
defects before they can cause serious damage or complete failure of the equipment. An effective preventative maintenance
program must begin with training all operators to report to unit maintenance all unusual conditions noted during daily checks
or actual operation. All defects discovered during maintenance inspections must be recorded together with the corrective
action taken on DD Form 2404, Equipment Inspection and Maintenance Worksheet.
INSPECTION AND SERVICE
A schedule for the unit preventative 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 comes first,
is recommended for usual operating conditions. When operating under unusual conditions, such as a dusty or sandy
environment, it may be necessary to reduce the interval to monthly and even less if conditions are extreme.
Table 2 lists the unit preventative maintenance checks and services that should be performe d 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 minimal amount of required maintenance downtime. The item number column wi ll be used
as a source of item numbers for the TM Number Column on DA Form 2404.
Dangerous, possibly fatal electric shock is imminent. Be sure to disconnect input power before taking apart the air
conditioner for PMCS.
The refrigerant compressor and its drive motor are hermetically sealed in a canister. The compressor is supplied with a
complete charge of oil and requires no lubrication. The evaporator and condenser fan motors have permanently sealed and
lubricated bearings. No lubrication of these items is required.
The only mechanical items that may need lubrication are the conditioned air supply and return louvers, the condenser air
discharge louver and control linkages, and the devices that operate the fresh air damper door. These points should be checked
and lubricated, as necessary, during preventative maintenance service. A few drops of oil should be applied to the pivot
points, bearing surfaces, and linkages in order to prevent or eliminate stiffness or binding. Wipe off excess oil with a cloth or
a paper towel. These items are in a high- volume airflow, therefore, excess oil can attract and accumulate dust particles from
the passing air. Graphite may be used as an alternate lubricant during extreme cold weather operation.