PRESSURE SWITCHES. (Cont) - TM-5-4120-383-140227

TM5-4120-383-14

5-26.

PRESSURE

SWITCHES.-Continued

Inspect.

(1) Disconnect power at power source.

(2) Remove control module and junction box (para 4-21 and 4-

It is not necessary to totally remove all wire connections

26).

and capillary line so long as the junction box can be pulled out

enough to gain access to the pressure switches. Support the

junction box so that wires and capillary line are not damaged.

(3) Remove front and rear top covers (para 4-11).

(4) Inspect pressure switches for visible signs of damage.

Test.

(1) Tag and disconnect wires to pressure switches.

(2) Press reset button on the switch. Use a continuity

tester or multimeter to check for continuity between terminals 1

If there is continuity the switch is

and 2 on each switch.

If no continuity is found on either switch, press

properly closed.

If there is

and release the reset button again on that switch.

still no continuity, that switch must be replaced.

c. Removal. Assuming that steps a. (1), (2), and (3) and b.

(1) above have been done proceed as follows.

(1) Discharge and purge refrigeration system per paragraphs

5-11 and 5-12.

(2) If HIGH PRESSURE switch is to be replaced, remove

conditioned air supply louver (para 4-14) for access to mounting

screws.

(3) Disconnect flare nut at end of capillary line from switch

to be replaced.

(4) Remove two screws and lock washers from switch to be

replaced.

(5) Carefully remove switch and capillary line.

5-61