TM 9-4120-357-14
Section IX. MAINTENANCE OF CONTROL PANEL AND JUNCTION BOX.
4-31. Control Panel.
a. General. The control panel contains the mode selector switch, the temperature control thermostat and the elec-
trical receptacle through which the controls are connected to the junction box. (See figure 4-9.)
b. Removal. Remove the control panel in accordance with the following instructions:
(1) Unscrew four panel fastener screws, three along the top edge, and one near the center of the panel, and re-
move the front access panel by pulling it upward and outward.
(2) Remove 12 screws and washers from the frames of the evaporator intake grilles and remove the grilles.
(3) Remove the self-locking nut and screw from the loop clamp holding the thermostat sensor bulb to the bottom
of the air filter channel.
CAUTION
Be careful to avoid kinking the capillary tube of the thermostat sensor when
handling it.
WARNING
Disconnect power from the air conditioner before doing maintenance work on the
electrical system. The voltages used can be lethal.
(4) Disconnect wiring harness connector from receptacle on control panel assembly.
(5) Remove four screws (7, figure 4-9) from the corners of the control panel mounting plange, and carefully
withdraw the assembly from the unit.
c. Disassembly. Disassemble the control panel as directed in the following procedure: (See figure 4-9.)
(1) Remove four screws and self-locking nuts from the rear cover of the control panel assembly.
(2) Loosen the socket head setscrews in each of the knobs (14), and remove the knobs from their shafts.
(3) Press the shaft of temperature control thermostat (5) inward to push the end of rear cover (2) out of box.
Grasp the rear cover, and remove.
(4) Tag wire leads for identification, and disconnect them from the temperature control thermostat.
(5) Remove four screws and nuts from the mounting flange of the temperature control thermostat, and
remove it from the rear cover (5).
NOTE
If the control panel has been placed in a remote location, remove screw nut and
loop clamp from sensor bulb to release temperature control thermostat (5) from
cover (2).
(6) Tag wires for identification, and disconnect them from the selector switch (4).
(7) Remove the panel mounting nut and lock washer from the ferrule of the selector switch, and remove the
switch.
(8) Remove four screws and self-locking nuts from the corners of the receptacle of the wiring harness (9).
(9) Remove one self-locking nut (18), two aluminum flat washers (17), two steel flat washers (11), two lock
washers (12), a nut (18), and the grounding wire from the right-hand end of the box (15).
(10) Withdraw the receptacle of the wiring harness (9) from the box, and remove two beveled spacers (8).
d. Inspection Test. Visually inspect all parts for obvious physical damage. Repair or replace as required. Test
electrical functions as directed in the following procedure.
4-35
