ARMY TM 9-4120-380-14
AIR FORCE TO 35E9-136-21
5.22. LOW REFRIGERANT PRESSURE SWITCH (S4). This task covers inspection, removal, testing/adjustment and
Tool kit, service, refrigeration unit (Item 1, Appendix B)
Varnish, moisture and fungus resistant (Item 11, Appendix E).
Disconnect input power
to the air conditioner before performing any internal
maintenance Voltages used can KILL Shutting the unit off at the control panel does not
disconnect unit power
Disconnect air conditioner input power at source,
a. Check that switch and cover are not dented, broken or cracked Replace switch and cover If defective (see fig.
b. Check that bracket IS not dented, broken or cracked. Replace bracket if defective
c. Check that wire leads are properly connected (see fig FO-2.)
Remove cover (6).
Tag and disconnect leads.
Disconnect high refrigerant pressure line (9).
Remove two screws (7), four flat washers (8), two locknuts (11), and two clamps (10).
Remove two screws (3), flat washers (2), and lockwashers (1)
Remove switch (4)