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TM 5-4120-259-15
57. Evaporator Fans and Motor
58. Condenser Fans and Motor
a. Removal and Installation. Remove and
a. Removal and Installation. Remove and
install the evaporator fans and motor as shown
install the condenser fans and nmtor as shown
by figure 16.
by figure 17.
b. Testing. Test the motor for continuity
b. Testing. Test
and shorts with a multimeter. Replace a de-
and shorts with a
fective motor.
fective motor.
Section IX. ELECTRICAL SYSTEM
the motor for continuity
multimeter. Replace a de-
59. General
This section contains the maintenance infor-
mation for the main control box, rotary control
switch, thermostat, junction box, circuit break-
er, motar contractors, thermal delay relay, ter-
minal board, solenoid valve coil, main power
connector, and wiring harnesses.
Caution: All testing and other work to the
electrical system must be done with power
plug disconnected.
60. Control Box, Rotary Control Switch,
and Thermostat
a. Adjust thermostat by turning adjusting
knob as shown by figure 18.
b. Remove and install the control box, ro-
tary control switch, and thermostat as shown
by figure 18.
61. Electrical Junction Box
Remove and install the electrical junction
box as shown by figure 19.
62. Circuit Breaker
a. Testing. Use a multimeter and test be-
tween terminals 1 and 4, 2 and 5, and 3 and
6 with the circuit breaker in the ON position.
If continuity does not exist in any of the three
test positions the circuit breaker is defective.
b. Removal and Installation. Remove and
install the circuit breaker as shown by figure
20.
63. Motor Contractors and Thermal
Delay Switch
a. Testing. Test across each of the three
motor contractors with a multimeter set on
26
ohms. Continuity should not be inidicated in
any of the test positions except between ter-
minals 4 and 8 of the compressor motor con-
tactor. If continuity does not exist acrow ter-
minals 4 and 8 of the compressor motor com-
tracts, the thermal delay switch is defective
and must be replaced. Check motor contactor
coil continuity. Replace motor contactor if de-
fective.
b. Removal and Installation. Remove and
install the contractors and relay as shown by
figures 20, 21 and 22.
c. Contacts Replacement. Replace the con-
tacts and coil as shown by figures 21 and 22
d. Thermal Delay
Switch Adjustment.
Make timing adjustment as shown by figure
23.
64. Terminal Board
Remove and install the terminal board as
shown by figure 20.
65. Solenoid Valve Coil
a. Testing. Test the solenoid coil for con-
tinuity and shorts with a multimeter. Replace
defective coil.
b. Removal and Installation. Remove and
install the solenoid valve coil as shown by
figure 24.
66. Main Power Connector and Box
Remove and install the main power con-
nector and box as shown by figure 25.
67. Wiring Harnesses
a. General. Except for connecting wires at-
tached to miscellaneous components, the com-
plete wiring system is composed of two main
harnesses. Each harness is individually re-
placeable.
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