ARMY TM 9-4120-380-14
AIR FORCE TO 35E9-136-21
HEAT FAULT THERMOSTAT (S8) This task covers inspection, testing, adjustment, removal 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 Shuttng the unit off at the control panel does not
disconnect unit power.
(1) Disconnect air conditioner input power at source, and
Remove screw (6) from thermostat cover (5) (see fig 4-46)
Remove cover (5) from thermostat (4).
Check that leads are properly connected (see fig. FO-2 )
Check that sensing coil (7) is not damaged.
Check thermostat for signs of overheating or other obvious damage. Replace if damaged.
a. Using multimeter, place probes on red and yellow terminals.
b. Slowly turn shaft counterclockwise until continuity s indicated Turn dial back and forth slightly to check that
switch contacts open and close.
Adjust thermostat to nominal 110 degrees F (43 3 ).
Tag and disconnect leads
Remove two nuts (3), flat washers (1), and lockwashers (2).