TM 9-4120-360-14
m. Fit the fabric cover over the back of the air conditioner. and secure it with 18 screws and washers on all four
sides.
Section XVIII. HEATING ELEMENTS
5.93. Description (See figure 5-10).
The six steel sheathed resistance heating elements are located immediately behind the evaporator coil, and extend all the
way across the width of the air conditioner. Three of the elements are energized when the selector switch is set at LO
HEAT, and all six elements are energized when the selectors switch is set at HI HEAT, The temperature control thermostat
controls only the elements energized by the LO HEAT setting. All six elements are protected against overheating by a
thermal overload protector (heater thermostat).
5.94. Access
a. Obtain access to the-heating elements as directed in the following steps:
Disconnect power from the air conditioner before performing maintenance on the electrical system.
The voltage used can be lethal.
b. Remove 18 screws and washers from the four sides of the fabric cover, and remove the cover.
c. Remove 15 screws and packing washers from the top surface of the top panel, and five screws from the rear
flange. Remove the top panel.
5.95. Removal
Remove the heating elements from the air conditioner in the following manner: (See figure 5-10).
a. Tag and disconnect wire leads from the ends of each element by unscrewing terminal nuts.
NOTE
Continuity testing of each element can be performed at this time if further disassembly is not required. (Refer
b. Unscrew the panel fastener screw in each hold down clamp and remove the clamp. Pull heating element
straight up to remove.
5.96. Inspection/Test
Visually inspect each heating element for damage. deformation. damaged terminal threads, cracked or broken sheath, or
burnt-out spots. If damaged, replace. Using an ohmmeter, multimeter or other continuity tester, check continuity of each
heating element. Replace elements that do not indicate continuity.
5.97. Installation
Install the heating elements in accordance with the following procedure:
a. Insert each heating element down between the heater mounting bar and the evaporator coil, with each
mounting arm equidistant from the panel fastener screw hole. Place hold-down clamp over both mounting arms, and
secure with the panel fastener screw.
b. Make proper wiring connections. (See wiring diagram, figure FO-1).
c. Position the top panel on the air conditioner. Secure it with 15 screws an packing washers in the top surface,
and five screws through the rear flange.
