WIRING.

TM 5-4120-369-14

4-36.

WIRING.

I n s p e c t i o n . Inspect insulation for cracks and signs of deterioration. Pay particular

attention to wires passing through holes in the frame and over rough metal edges. If inspection

reveals a broken or cut wire, and the wire is exposed, it must be repaired. I f t h e b r e a k i n t h e

wire is in the wiring harness or in an inaccessible area, replace wire per 4-34 c. below).

Testing Test a wire for continuity by disconnecting each end from the camponent(s)

to which it is connected. Touch the test probes of a multimeter to the ends of the wire under

test. If continuity is not indicated, the wire is defective and must be repaired or replaced.

c. Replacement.

To replace a defective wire lead, disconnect both ends at the components

wire with an exact duplicate of wire being replaced. If the defective wire is

and install new

difficult to remove from wiring harness, cut the wire back from the components about two inches

and cover ends to outside of harness with electrical tape or plastic clamps.

HIGH PRESSURE CUT-OUT SWITCH (S-4) AND LOW PRESSURE CUT-OUT SWITCH (S-5).

General. The high pressure cut-out switch prevents the compressor from operating if

the &charge pressure exceeds 445 10 psig. The low pressure cut-out switch prevents the com-

pressor from operating if the suction pressure drops below 15 5 psig. Each is reset manually.

Inspect and test the switches if the compressor fails to operate after the switch is reset.

Inspection.

(1) Refer to paragraph 4-18, and remove the top covers

(2) Inspect for broken or damaged wire leads kinked or broken capiliary tubes.

Testing.

REFRIGERANT UNDER PRESSURE

is used in this equipment Organizational personnel

are not authorized to open the pressurized system.

(1) Using a multimeter, test for continuity between terminals 1 and 2 of each

pressure cut-out switch.

(2) If continuity is not indicated, the pressure cut-out switch is defective and must

be replaced. Report to Direct Support maintenance for replacement of defective switch.

LIQUID LINE SOLENOID VALVE (L1) .

General. The normally-open liquid line solenoid valve is electrically closed when the

mode selector switch is turned to COOL. When the temperature control thermostat is satisfied,

the liquid line solenoid valve opens placing the refrigerant system in the bypass condition.