Check to be sure that the source of power for the shelter and the air conditioner are compatible.
h. Connect the power cable to the input power source (208 volt, 3 phase, 60 hertz) and the air conditioner.
i. Run operational checks in accordance with paragraph 2-6.
The refrigerant compressor and its drive motor are hermetically sealed in a canister. The compressor
crankcase has a lifetime supply of oil and the drive motor has permanently lubricated, sealed bearings. The
evaporator and condenser fan motors also have permanently lubricated, sealed bearings. No lubrication of
these items is required.
4-9. MECHANICAL LUBRICATION
The only mechanical items which may require lubrication are the conditioned air supply and return louvers,
the condenser air discharge louver and control linkages and the devices which operate the fresh air damper
door. These points should be checked and lubricated, as necessary, during preventive maintenance service. A
few drops of light oil should be applied to pivot points, bearing surfaces, and linkages to prevent or eliminate
stiffness or binding. Be sure to wipe off all excess oil with a cloth or paper towel. These items are in an area of
high volume airflow and excess oil will tend to attract and accumulate dust particles from the passing air.
Graphite may be used as an alternate lubricant during extreme cold weather operation.
PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS)
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 organizational maintenance. All
defect S and deficiencies discovered during maintenance inspections must be recorded, together with
corrective action taken, on DA Form 2404 (Equipment inspection and Maintenance Worksheet).
4-11. lNSPECTION AND SERVICE
a. A schedule for organizational 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.
b. Table 4-1 lists the organizational preventive maintenance checks and services that should be performed
at quarterly (or otherwise established) intervals. Figure 4-7 shows the location of PMCS items. The PMCS items