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TM5-4120-377-14
a. Inspection/Test
(1) Check to see that power has been disconnected.
(2) Using screwdriver, remove two screws and lock washers from switch.
(3) Carefully pull switch from box far enough to gain access to terminals. Remove protective clip-on cap.
(4) Check that wire leads and terminal attachment screws are in place and secure. Tighten if loose.
Replace if missing.
(5) Check that capillary line is not kinked, mashed, or broken. Replace switch if capillary line is
damaged.
NOTE
Check that refrigerant system is properly charged. (See para 5-12.)
(6) Press and release the reset button to be sure switch is not tripped.
(7) Use a continuity tester or multimeter to check for continuity between terminals 1 and 2 on switch. If
there is continuity, the switch is properly closed. If no continuity is found, switch must be replaced.
b. Removal
(1) Discharge the refrigerant system per paragraph 5-6.
(2) Using screwdriver, remove two screws and lock washers from pressure switch.
(3) Using wrench, loosen and disconnect pressure switch capillary tubing flare nut from low pressure
(suction) service valve line.
Carefully pull switch from box far enough to gain access to terminals. Remove protective clip-on cap.
Tag and disconnect wire leads from pressure switch.
Remove pressure switch and capillary with flare nut from unit.
c. Installation
Insert capillary with flare nut through hole in back of casing bulkhead.
See tags and wiring diagram (fig. 4-20) and connect wire leads.
Remove tags and install protective clip-on cap.
Using screwdriver, secure pressure switch to box with two screws and lock washers.
Using wrench, connect flare nut to low pressure (suction) service valve line.
Carefully coil excess capillary tubing and tape in place to eliminate vibration.
Replace the dehydrator. (See para 5-13.)
Leak test all newly connected joints and those in the repaired area. (See para 5-9.)
(9) Evacuate and charge the refrigerant system. (See para 5-10 and 5-11.)
Follow-on procedure: 1. Install rear panel. (See para 4-32.)
2. Press and release pressure switch reset buttons to be sure they are not tripped.
5-25
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