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 TM 55-1905-220-14-9
4-42. WASHER/DRYER - MAINTENANCE INSTRUCTIONS (Continued).
NOTE
When a fuse link is found to have an open circuit it is
recommended that the temperature control thermostat be
replaced along with the fuse link. This recommendation is made
because a relationship between open fuse links and intermittent
abnormal temperature control thermostat operation was found.
Thermostats have been observed to operate between normal
cutin and cutout temperatures for a number of cycles, then
remain closed to allow a higher than normal temperature to be
reached. This may occur at varying intervals causing the fuse
link to become opened. Whenever a fuse link is found open the
heater element should be checked for a grounded condition.
(5)
Safety limiter thermostat. A second "snap" action thermostatic switch provides a back-up to the
heat control thermostat. This thermostat is located in the back panel near the heating element and operates in
the same manner as the heat control thermostat. This provides the drying system with protection in the event
of blocked exhaust, clogged lint screen, an overloaded drum, etc.
(6)
Pushbutton starting switch and dryer door.
(a)
The pushbutton starting switch and dryer door switch are single pole single throw switches riveted
to a common mounting bracket
(b)
The start push button when depressed closes a circuit to the motor running and starting windings.
The button must be held in until the motor comes up to operating speed, approximately one second, at which
time the single-pole, double-throw, motor governor operated switch, changes contacts and allows the motor to
run without the start button.
(c)
The dryer door switch actuating arm extends through a slot in the front panel in the dryer door
opening. When its contacts are held closed by the dryer door it maintains a circuit to the dryer motor.
(7)
Cycle end buzzer.
(a)
The cycle end buzzer sounds for approximately 1 second at the end of either cycle indicating to
the user that the clothing should be removed from the dryer at that time, to avoid wrinkling. Cycle end buzzer
operation is as follows:
Change 1
4-1066
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