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CHAPTER 4
DIRECT SUPPORT AND GENERAL SUPPORT
MAINTENANCE INSTRUCTIONS
Section I. REPAIR PARTS, SPECIAL TOOLS
AND EQUIPMENT
4-1. Tools and Equipment.
direct or general support maintenance personnel to
Tools and equipment issued with or authorized for
maintain the air conditioner.
the air conditioner are listed in the basic items list,
4-3. Maintenance Repair Parts.
appendix C.
Direct and general support maintenance repair
4-2. Special Tools and Equipment.
parts
are
listed
in
T M 5 - 4 1 2 0 - 3 3 5 - 2 4 P.
There are no special tools or equipment required by
Section II. TROUBLESHOOTING
4-4. General.
The corrective action recommended is described
This section provides information useful in
opposite the probable cause. The troubleshooting
diagnosing and correcting unsatisfactory operation
operations shown in table 4-1 are only those which
or failure of the air conditioner or any of its
cannot be performed at organizational maintenance
components. Malfunctions which may occur are
levels (see table 3-2 for organizational maintenance
listed in table 4-1, Each malfunction stated is
troubleshooting). Refer to FO-3 (Located in the
followed by a list of probable causes of the trouble.
back of manual) for refrigeration schematic.
Table 4-1. Troubleshooting
Malfunction
1. Compressor will not start.
2. Cooling insufficient in cooling
position.
3. Cooling excessive in cooling
position.
4. Heater does not heat properly.
Probable Cause
a. Corn presser defective.
b. P o w e r s w i t c h , s w i t c h N o , 2
defective,
c. Selector switch, switch No. 2
defective.
d. Thermostatic switch defective.
e. Power relay defective.
f. Starting capacitor defective.
a. Evaporator fan motor defective.
b. Condenser fan motor defective.
c. Compressor defective.
d. Thermostatic switch defective.
?. Filter drier clogged.
a. Thermostatic expansion valve
defective.
b. Power relay defective.
c. Thermostatic switch defective.
a. Heater overtemperature protector,
thermostat defective.
b. Selectro switch, switch No. 3
defective.
c. Thermostatic switch defective.
Corrective Action
a. Replace compressor, (para 4-14).
b. Replace switch, (para 3-25).
c. Replace switch, (para 3-25).
d. Replace switch, (para 4-18).
e. Replace relay, (para 3-27).
f. Replace capacitor, (para 3-20).
a. Replace motor, (para 3-17).
b. Replace motor, (para 3-18).
c. Replace compressor, (para 4-14).
d. Replace switch, (para 4-18).
e. Replace filter drier, (para 4-12).
a. Replace valve, (para 4-17).
b. Replace relay, (para 3-27).
c. Replace switch, (para 4-18).
a. Replace heater over-temperature
protector, thermostat, (para 3-
24).
b. Replace switch No. 3, para 3-25).
c. Replace switch, (para 4-18).
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4-1
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