TM 9-4120-388-14
4-39. TEMPERATURE CONTROL THERMOSTAT (S2) - Continued.
Test.
c.
(1)
Using multimeter, place probes on the red and blue terminals.
(2)
Turn Temperature control thermostat shaft fully clockwise.
(3)
Check continuity. If temperature at sensing bulb is above 40F (5C), there should be no continuity.
(4)
Slowly turn shaft counterclockwise until continuity is indicated. Turn shaft back and forth slightly to be sure
that switch contacts open and close on a very narrow band.
Place multimeter probes on the red and yellow terminals.
(5)
Turn TEMPerature control thermostat shaft fully counterclockwise.
(6)
(7)
Check continuity with multimeter. If temperature at sensing bulb is below 90F (32C) there should be no
continuity.
(8)
Slowly turn shaft clockwise until continuity is indicated. Turn shaft back and forth slightly to be sure that
switch contacts open and dose on a very narrow band.
Replace TEMPerature control thermostat if it fails any of the above tests.
(9)
Removal.
d.
(1) Tag and disconnect leads.
(2) Remove four screws and lock nuts.
(3) Remove Temperature control thermostat.
Installation.
e.
(1) Secure Temperature control thermostat to rear panel with four screws and lock nuts.
(2) Place capillary line through notch and split grommet in rear panel.
(3) See tags and wiring diagram, Figure 4-16, and connect leads.
NOTE
Take care that sensing bulb capillary line is not kinked or mashed.
(4) Insert rear panel into box and align holes.
(5) Secure rear panel with four screws and lock nuts.
(6) Place Temperature control thermostat knob on shaft and align setscrew with flat on shaft.
(7) Tighten setscrew.