TM 9-4120-395-14&P
4-41. HEATER ELEMENT.
This task covers:
a. Inspection
b. Testing
c. Removal
d. Installation
INITIAL SETUP:
TooIs:
Tool Kit, service, refrigeration unit
Equipment Conditions:
Power off at power source.
General Safety Instructions:
Disconnect input power to the unit before performing any internal maintenance.
Voltages used can kill. Shutting the unit off at the thermostat does not disconnect
unit power.
a.
Inspection.
(1) Remove the three screws (1, Figure 4-37) and lift off the heater access door (2) on the upper right side
of the air conditioner.
(2) Check the wiring and heater element (3) for damage and loose mounting screws (4).
(3) Replace the heater access door (2) and secure with the three screws.
b.
Testing.
(1) Remove the three screws (1, Figure 4-37) and lift off the heater access door (2) on the upper right side
of the air conditioner.
(2) Use the multimeter to check the element (3). Place rnultimeter probes on red and black wires connected
to heater element. An open or direct short to ground indicates a defective heater element which must be
replaced.
(3) Install the heater access door (2) and secure with the three screws.
c.
Removal.
(1) Remove the three screws (1, Figure 4-37) and lift o-f the heater access door (2) on the upper right side
of the air conditioner.
(2) Tag and remove the wires on the heater element (3).
(3) Remove the two screws (4) and lift out the heater element.
d.
Installation.
CAUTION
The rod on the end of the heater element must be inserted in the proper hole on the
left side of the air conditioner. To be properly mounted the heater element must be
parallel to the other components in the air conditioner. Mismounting the heater
element can cause the heater element to malfunction.
(1) Place the heater element (3, Figure 4-37) into position in the heater assembly (2) and secure with the two
mounting screws (4).
(2) Connect the wires as marked and remove the tags.
(3) Install the heater access door (2) and secure with the three screws (1).
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