ARMY TM 9-4120-380-14
NAVY EE-000-BA-MMA-010/7053-AC
AIR FORCE TO 35E9-136-21
4.56
HEAT FAULT THERMOSTAT (S8) This task covers inspection, testing, adjustment, removal and
installation.
INITIAL SETUP
Tool:
Tool kit, service, refrigeration unit (Item 1, Appendix B)
Personnel: 1
Material:
Varnish, moisture and fungus resistant (Item 11, Appendix E)
Equipment Conditions:
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
(2) Remove return air filter (paragraph 4 26)
INSPECTION
a.
Remove screw (6) from thermostat cover (5) (see fig 4-46)
b.
Remove cover (5) from thermostat (4).
c.
Check that leads are properly connected (see fig. FO-2 )
d.
Check that sensing coil (7) is not damaged.
e.
Check thermostat for signs of overheating or other obvious damage. Replace if damaged.
TESTING
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.
ADJUSTMENT
Adjust thermostat to nominal 110 degrees F (43 3 ).
C
REMOVAL
a.
Tag and disconnect leads
b.
Remove two nuts (3), flat washers (1), and lockwashers (2).
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