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TM5-4120-376-14
4-24. HEATER, TRANSFORMER, RECTIFIER AND RELATED PARTS/Inspect, Test, Replace
(Cont)
LOCATION/ITEM
THERMOSTATIC SWITCH (HEATER) and MOUNTING BRACKET
Inspect:
1. Inspect for damage.
2. Repair or replace if damaged.
Test:
1. Using a multimeter check continuity of the wire leads attached to terminals 1 and 2, of
the heater thermostat. Continuity is not indicated if thermostatic switch (heater) is defective.
2. Replace defective thermostatic (heater).
3. Tape the bulb of a thermometer or junction of a thermocouple to the body of the heater
thermostat, and leave the continuity tester connected to terminals one and two. Gradually
apply heat, and observe both the thermometer and the continuity tester. Continuity should drop
out at 194 + 9°F (90 + 5°C). While still continuing to watch the thermometer and the continuity
tester, let the heater thermostat cool. Continuity should be re-established at 142 + 17°F (61 +
9°C).
4. Repeat step 1 with the meter connected to terminal
5. If the heater thermostat does not meet temperature
defective.
6. Replace defective thermostatic switch (heater).
Installation:
3 and 4.
and continuity requirements, it is
1. Align heater thermostatic mounting bracket (12) with holes in housing and secure with
three screws (17) and three lock washers (18).
2. Align sensor bulb (16) and one clamp (15) with holes in
with one screw (13) and one lock washer (14).
3. Attach wire to appropriate terminals on thermostat in
remove tags.
mounting bracket (12) and secure
accordance with Appendix E and
4-143
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