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TM 5-4120-259-15
30. Quarterly Preventive Maintenance
intervals. A quarterly interval is equal to 3
Services
calendar months, or 250 hours of operation,
whichever occurs first.
a. This paragraph contains an illustrated
b. The item numbers are listed consecutive-
tabulated listing of preventive maintenance
ly and indicate the sequence of minimum re-
services which must be performed by Organi-
quirements. Refer to figure 11 for the
zational Maintenance personnel at quarterly
Quarterly Preventive Maintenance Services.
Section IV. OPERATOR MAINTENANCE
31. General
paragraph 29, the operator will also perform
The instructions in this section are published
the service procedures covered in the section.
for the information and guidance of the oper-
ator to maintain the air conditioner. In addition
32. Cleaning Air Filters
to the maintenance responsibilities listed in
Refer to figure 12 and service the air filter.
Section V. TROUBLESHOOTING
33. General
followed by a list of probable causes of the
trouble. The possible remedy recommended is
This section provides information useful in
described opposite the probable causee. Any
diagnosing and correcting unsatisfactory opera-
trouble beyond the scope of organizational
tion or failure of the air conditioner and its
maintenance shall be reported to direct sup-
components. Each trouble symptom stated is
port maintenance.
34. Compressor Starts but Fan Motor(s) will not Run
Probable Cause
Possible Remedy
Control switch or motor defective.
Check fans to make sure they turn freely by hand.
Check wiring and terminals for loose connections.
Check control switch continuity with multimeter
(fig. 5). If switch is not defective check motor
(para 57 and 58) and remove and service if necessary.
35. Both Fan Motors Run-Compressor Motor will not Start (Selector Switch on COOL)
Probable Cause
Possible Remedy
Circuit breaker open.
Determine and correct cause of overload.
High pressure cut-out or compressor thermal pro-
If both fan motors operate but the compressor motor
tector open.
does not run, check the high pressure cut-out.
This cubout is a manual reset type. Check the com-
pressor thermal protector for continuity (fig. 5).
If the motor has cut-out on the above safety
devices, determine and correct the cause.
Open circuit.
Apply multimeter to compressor motor terminals
(wiring Diagram, fig. 5).
36. Condenser Fan Motor Runs-
Compressor will not Start (Selector Switch on COOL)
Probable Cause
Possible Ramedy
Circuit breaker open.
Determine and correct cawe of overload.
Thermal delay switch defective.
Repair or replace (para 63).
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