ARMY TM 9-4120-380-14
AIR FORCE TO 35E9-136-21
THERMOSTAT (S2) This task covers inspection, testing, removal and installation.
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. Shuttmg the unit off at the control panel does
not disconnect unit power.
(1) Disconnect air conditioner input power at source, and
a. Check that leads are properly connected (see fig FO-2).
b. Check that capillary line and sensing bulb are not damaged (see fig 4-44).
c Check thermostat for signs of overheating or other obvious damage Replace if damaged.
a. Using multimeter, place probes on each set of red and blue terminals, m turn.
b. At each set, slowly turn dial back and forth slightly to check that switch opens and closes (see fig. FO-2)
c. Repeat Steps a and b with probes on red and yellow terminals.
b. Replace thermostat if it fails any of above tests
a. Tag and disconnect leads
b. Remove two screws (1), locknuts (3), flat washers (4), clamps (5), and sensing bulb (2).
c Remove four nuts (6) flat washers (8), and lockwashers (7).
Remove thermostat (9).