INSPECTION - TM-5-4120-393-140270

TM 5-4120-393-14

5-27. Low (S6) and High (S5) Pressure Cutout Switches (cont)

Using wrench, loosen and disconnect high pr essure switch (5) capillary tubing flare nut (6) from compressor discharge

line and low pressure switch (7) capillary tubing flare nut (6) from compressor suction line.

Remove plug P16 from connector.

Using screwdriver, remove screw, washer, and clamp holding capillary line to the fan housing.

Carefully work capillary lines and switch assembly enclosure out of unit.

INSPECTION

NOTE

The following procedures apply to both switches.

Check that mounting screws and terminal attachment screws are in place and secure. Tighten if loose. Replace if

missing.

Check that capillary line is not kinked, mashed, or broken. Replace switch if capillary line is damaged.

Press and release the reset button to be sure switch is not tripped.

NOTE

The low pressure switch is normally open, therefore a pressure greater than 35

psig must be in the system or used for bench testing before checking (S6) for

continuity.

4. 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.

DISASSEMBLY

Using screwdriver, remove two screws (3) and washers (4) (from each switch).

Tag and disconnect wire leads from pressure switch.

Remove pressure switch (5) or (7), grommet (8), and capillary with flare nut (6) from unit.

INSTALLATION

Using screwdriver, secure pressure switch (5) or (7) to box with two screws (3) and washers (4).

Insert capillary through opening in box and position grommet (8).

See tags and wiring diagram, para 4-13, and connect wire leads.

Remove tags.

Carefully feed capillary tubing down to flare connection on discharge line for high pressure cutout switch and to flare

connection on suction line for low pressure cutout switch.

5-64