TM 5-4520-253-13
l N S P E C T / T E S T / R E M O V E / l N S T A L L R E S E T C I R C U I T B R E A K ER
TEST EQUIPMENT: Volt ohmmeter
GENERAL SAFETY INSTRUCTIONS:
Power off.
Heater cool.
INSPECTION:
1.
2.
3.
Death or serious injury could occur if precautions are not
taken when maintaining this equipment. Position HEATER-
OFF-FAN switch to OFF, remove power cable plug from
POWER RECEPTACLE, and ground capacitors C1 and C2
prior to gaining access to heater compartments. Terminals
of capacitors are accessible at end cover of combustion
blower. Always disconnect power cable before making con-
tinuity tests or before repairing heater. Always have
another person standing by who is trained in electric shock
first aid.
Allow sufficient time for heater to cool to room tempera-
ture before gaining access to heater compartments.
Check for cracked or broken body (1) and
damaged quick disconnect terminals (2).
NOTE
Removal of seal boot (3) allows
RESET circuit breaker to back out
of mounting hole. Hold circuit
breaker by hand during inspection.
Remove seal boot (3) and examine threads of RESET circuit breaker. Replace seal.
If circuit breaker is in tripped position, depress button (4),
TESTING:
1. Disconnect violet wires (5), yellow wires (6), and grey wire (7) at quick disconnect terminals (2).
2. Using volt ohmmeter, check RESET circuit breaker for continuity as follows:
a. Place one probe on terminal 1 and other probe on terminal 3. Meter should indicate continuity.
b. Place one probe on terminal 2 and other probe on terminal 3. Meter should indicate continuity.
3. If either test 2.a or b fails to indicate continuity, replace circuit breaker. Connect violet wires (5)
to terminal 1, yellow wires (6) to terminal 3, and grey wire (7) to terminal 2.
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