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TM 9-4120-389-14
(5)
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.
(6)
Place multimeter probes on the red and yellow terminals.
(7)
Turn temperature control switch shaft fully counterclockwise.
(8)
Check continuity. If temperature at sensing bulb is below 90 degrees F (32 degrees C) there
should be no continuity.
(9)
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.
(10)
Replace temperature control switch if it fails any of the above tests.
c.
Removal
(1)
Remove four screws that secure cover to control module.
(2)
Tag and disconnect wires.
(3)
Remove mounting frame (See para. 4-42).
(4)
Loosen set screw and remove temperature select knob from temperature control switch
shaft.
(5)
Remove four screws, flat washers and self-locking nuts. Remove switch.
(6)
Remove and retain clamp for installation of replacement switch. (Note location of clamp).
d.
Replacement
(1)
Install clamp on capillary tube.
(2)
Align hole pattern of switch to hole pattern on inside of frame.
(3)
Secure switch and clamp to frame with four screws, flat washers and self-locking nuts.
(4)
Install temperature select knob on shaft of temperature control switch shaft and tighten set
screw.
(5)
Reconnect wires and remove tags.
(6)
Secure cover to control module with four screws.
Follow-up procedures:
1.
Install mounting frame (See para. 4-42).
2.
Install control module (See para. 4-38).
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