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 TM9 4120-423-14&P
TESTING
1
Inspect for cracks, loose connections, and obvious damage. Replace if defective.
2
Tape the bulb of a thermometer or junction of a thermocouple to the body of a thermostatic
switch, and connect the multimeter to terminals one and two. Use a 150-watt bulb or a heat
source. Gradually apply heat while observing both the thermometer and the multimeter.
Continuity should drop out at 185 to 190Ε F (85 to 88Ε C). Remove heat source and let the
thermostat cool while observing the thermostat and multimeter. Continuity should be re-
established at 140 to 160Ε F (60 to 71Ε C).
3
Repeat step 2 with meter connected to terminals 3 and 4.
4
If the thermostatic switch does not meet the above requirements, replace it.
5
Check condition of thermostatic switch bracket. Replace the bracket if it is badly bent, cracked,
or otherwise damaged. If the rivets or plate nuts are loose, missing, or damaged, repair or
replace them.
END OF TASK
0020 00-5
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