ARMY TM 9-4120-380-14
NAVY EE-000-BA-MMA-010/7053-AC
AIR FORCE TO 35E9-136-21
4.29 PRIME UNIT SELECT SWITCH (S11). This task covers inspection, testing, removal and installation
INITIAL SETUP
Tool:
Tool kit, service, refrigeration unit (Item 1, Appendix B)
Personnel: 1
Equipment Conditions
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.
(1) Disconnect air conditioner input power at source; and
INSPECTION
a. Check that wire leads are properly connected (see fig. FO-2.)
b. Check that leads are not loose or broken. Tighten loose leads Replace if defective
c.
Check switch (3) for signs of overheating or other visible damage. If wires are damaged, replace as necessary
TESTING
a. Using multimeter, check continuity between center and outer terminals with wire connected. Set switch to
PRIMARY, then BACKUP.
b. If switch fails test, replace switch
REMOVAL
a. Tag and disconnect leads.
b. Remove nut (1), washer (2), and switch (3) from panel.
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