Section XII. MAINTENANCE OF HEATERS AND THERMOSTATIC SWITCH

TM 5-4120-352-14

4 - 3 3 . Wiring Harnesses and Leads.

terminate in an electrical connector, disconnect

connector from corresponding receptacle connector

a. General. The electrical circuits in the air

or plug connector. Touch the test probes of a con-

conditioner are completed either by individual wire

tinuity tester, or multimeter set on low ohms to

leads or by wire leads laced or enclosed in a loom to

ends of wire or corresponding pin of connector. If

form a wiring harness. All of the wiring carries code

continuity is not indicated, repair or replace wire.

numbers. When testing, repairing or replacing the

d. Repair. Remove insulation to expose 1/2 inch

wiring harness or individual wires, refer to the wir-

of bare wire on each side of break. Twist the wire

ing diagram (1-5) and schematic diagram (1-4).

ends and solder the splice. Cover the splice with

b. Inspection. Inspect all wiring installation

PVC electrical tape, making certain to cover all the

for cracked or frayed insulation material. Pay par-

repaired area. Replace broken terminal lugs with

ticular attention to wires passing through holes in

exact duplicates. To replace electrical connectors,

the frame or around sharp edges. Repair or replace

unsolder wires from solder wells to inserts. Install

defective wiring. Inspect electrical connectors and

fittings for damage or broken condition. Replace de-

new connector and insert ends of wires in solder

wells. Solder wires in place. Check connections care-

fective connectors and fittings.

fully. Refer to wiring diagrams.

c. Testing. Test for continuity in leads or wiring

harnesses by disconnecting each end. Where wires

Section XII. MAINTENANCE OF HEATERS AND THERMOSTATIC SWITCH

front cover.

4 - 3 4 . Heater Thermostatic Switch.

(2) Refer to figure 4-9 and remove two screws

a. General The heater thermostatic switch,

(1) to remove bracket and switch from center cover.

mounted in a bracket under the housing center cov-

er, protects the air conditioner from overheating if

(3) Remove two screws (2) and lockwashers

(3) and remove bracket (4).

the heating element circuit is actuated and the air

flow is restricted or stopped.

(4) Remove switch screws (5) and disconnect

leads (6) from thermostatic switch (7).

b. Removal. Remove the switch as follows:

(1) Refer to figure 4-5 and remove housing

4-21