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 TM 5-4120-35S5-14
b. Removal. Refer to figure 4-10 and remove the heater elements.
c. Inspection and lasting.
(1) Inspect for broken or damaged elements.
(2) Test for continuity across elements with multimeter set on OHMS. Refer to wiring diagram figure 1-3 to
establish points of continuity.
d. Installation. Refer to figure 4-10 and install heating elements.
a. General. The high pressure switch prevents the compressor from operating if the head pressure exceeds 445
psig (fig. 4-13).
b. Inspection and Tasting.
(1) Inspect for broken or damaged leads and kinked or broken capillary tubing.
(2) Test for continuity across switch with multi meter set on OHMS. Refer to wiring diagram figure 1-3 to
establish points of continuity.
4-36. Lo Pressure Switch.
a. General. The low pressure switch prevents the compressor from operating if the suction pressure drops below
25 psig (fig. 4-13).
b. Inspection and Tasting.
(1) Inspect for broken or damaged leads and kinked or broken capillary tubing.
(2) Test for continuity across switch with multiimeter set on OHMS. Refer to wiring diagram figure 1-3 to
establish points of continuity.
4-37. Fan Speed Pressure Switch.
a. Inspect for broken or damaged contacts (fig. 4-11).
b. Test for continuity with multi meter set on OHMS. Refer to wiring diagram figure 1-3 to establish points of
continuity.
a. General. The outside air thermostat is mounted to the rear housing of the air conditioner. It prevents the com-
pressor from starting when the outside temperature is below 50 degrees F. This prevents the unit from being operated
at a time when low condensing and suction pressures will hamper system operation.
b. Removal. Refer to figure 4-13 and remove the outside air thermostat.
c. Testing. Test the thermostat for continuity with a multimeter set on OHMS. Refer to wiring diagram figure
1-3 for points to establish continuity.
d. Installation. Refer to figure 4-13 and install outside air thermostat.
4-39. Electric Heatar Thermostat.
a. General. The electric heater thermostat (fig. 4-1 O) protects the heater elements from overheating.
b. Removal. Refer to figure 4-10 and remove the electrical heater thermostat.
4-24
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