Circuit Breaker. - TM-5-4120-355-140055

TM 5-4120-355-14

b. lnspection and Testing.

(1) lnspect for broken or cracked case and broken or damaged contacts.

(2) Test for continuity through both primary and secondary sides of transformer with multimeter seton OHMS.

Refer to wiring diagram, figure 1-3, to establish points of continuity.

c. Installation. Refer to figure 4-12 and install transformer.

a. General. The circuit breaker protects the compressor from continuous overcurrent and short circuits. located

in the lower right corner of the junction box. Refer to figure 4-12 and push switch lever up to reset.

b. Removal. Refer to figure 4-12 and remove the circuit breaker.

c. Testing. Refer to figure 4-12 and tag and disconnect the leads. Test the circuit breaker for continuity with a mul-

timeter set on OHMS. Refer to wiring diagram, figure 1-3, to establish points of continuity.

d. Installation. Refer to figure 4-12 and install circuit breaker.

4-32. Compressor Motor Relay and Electrical Heater Relay.

a. General. Both relays are located in the junction box, figure 4-12. A motor relay starts the compressor motor and

a heater relay is connected to the electrical heaters.

b. Removal. Refer to figure 4-12 and remove relays.

c. Inspection and Tasting.

(1) Inspect for pitted or burned contacts.

(2) Test for continuity across coil with a multimeter set on OHMS. Refer to wiring diagram, figure 1-3, to es-

tablish points of continuity.

d. Installation. Refer to figure 4-12 and install relays.

4-33. Rectifier.

a. General. The rectifier changes alternating current to direct current.

b. Removal. Refer to figure 4-12 and remove rectifier.

c. Inspection and Tasting.

(1) Inspect for cracked or broken casing and burned or damaged contacts.

(2) Test for continuity with multi meter set on OHMS. Refer to wiring diagram, figure 1-3, to establish points

of continuity.

d. Installation. Refer to figure 4-12 and install rectifier.

4-34. Heater Elements.

a. General. The electrical resistance heaters are mounted directly behind the evaporator coil. These heaters provide

the heat called for by the thermostat to maintain the required temperature of the conditioned air. The heaters provide

two ranges of heating and are manually controlled by placing the selector switch in the proper position (LO-HEAT or

HI-H EAT) to maintain the required temperature.

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