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TM 5-4120-377-14
(3) Check continuity. If temperature at sensing bulb is above 40°F (5°C), there should be no continuity.
(4) Slowly turn shaft counterclockwise until continuity is indicated. Turn shaft back and forth slightly to
check that switch contacts open and close on a very narrow band.
(5) Place multimeter probes on the red and yellow terminals.
(6) Turn TEMPerature control thermostat shaft fully counterclockwise.
(7) Check continuity. If temperature at sensing bulb is below 90°F (32°C) there should be no continuity.
(8) Slowly turn shaft clockwise until continuity is indicated. Turn shaft back and forth slightly to check
that switch contacts open and close on a very narrow band.
(9) Replace TEMPerature control thermostat if it fails any of the above tests.
d. Removal
(1) Tag and disconnect leads.
(2) Using screwdriver and wrench, remove four screws and lock nuts.
(3) Remove TEMPerature control thermostat.
e. Installation
(1) Using screwdriver and wrench, 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 4-20, and connect leads.
NOTE
Take care that sensing bulb capillary
(4) Insert rear panel into box and aline holes.
line is not kinked or mashed.
(5) Using screwdriver and wrench, secure rear panel with four screws and lock nuts.
(6) Place TEMPerature control thermostat knob on shaft and aline setscrew with flat on shaft.
(7) Using allen wrench, tighten setscrew.
Follow-on procedure:
Install control panel. (See para 4-37.)
4-81
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