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ARMY TM 9-4120-381-14
NAVY EE-000-CA-MMA-010/7053-AC
AIR FORCE TO 35E9-136-31
4-85. HEAT CONTROL THERMOSTAT (S9).
This task covers:
a.
Inspection
b.
Testing
c.
Adjust
d.
Removal
e.
Installation
INITIAL SETUP:
Tools
Tool kit, service, refrigeration unit (Item 1, Appendix B)
Personnel: 1
Material:
Varnish, moisture and fungus resistant (Item 16, Appendix E)
Equipment Conditions:
WARNING
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.
2.
Remove left front evaporator panel (para 4-23).
INSPECTION
1.
Check that leads are properly connected (see Figure 4-85 and Figure FO-3).
2.
Check that capillary line is not damaged.
3.
Check thermostat (5) for signs of overheating or other obvious damage. Replace if damaged.
TESTING
1.
Using multimeter, check continuity. Place probes on red and blue terminals.
2.
Slowly turn dial counterclockwise until continuity is indicated. Turn dial back and forth slightly to check that
switch contacts open and close on a very narrow band.
3.
If thermostat fails test, replace thermostat.
ADJUST
Set thermostat to 72°F (22°C).
REMOVAL
1.
Remove screw (6) and cover (7).
2.
Remove four screws (1), lockwashers (2), and flat washers (3).
3.
Gently pull thermostat (5) away from bracket (4) as far as harness will allow.
4.
Tag and disconnect leads.
5.
Remove thermostat (5).
4-166
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