WAVEJET MICROWAVE OVEN
COMPONENT MAINTENANCE MANUAL
WITH ILLUSTRATED PARTS LIST
25-30-43
Page
3
March 15, 2003
3. Provide good circulation behind the unit with a separate fan that would
both supply fresh air for the intake and exhaust the warm air.
C.
Overheat Protection
The Wavejet Microwave incorporates Overheat Protection to deactivate the
microwave in the event of an overheat condition or to prevent an overheat
from occurring. There are 4 components to the overheat protection outlined
below.
Altitude Switch: The altitude switch prevents the microwave from operating
when a loss of cabin pressure has occurred. The altitude switch turns the
microwave OFF when the cabin pressure exceeds 10,000 feet. If the altitude
switch failed to open when the pressure exceeded 10,000 feet, the
microwave might overheat and result in tripping one or more of the following
thermostats.
High Voltage Transformer Overheat Thermostat – This Overheat Thermostat
is located within the high voltage transformer and turns power OFF when the
transformer exceeds its normal operating temperature. The overheat
automatically resets when the transformer cools down. The overheat is part
of the power supply assembly and is not field replaceable.
Magnetron Overheat Thermostat – This Overheat Thermostat is located on
the Magnetron and will trip if the magnetron exceeds its’ normal operating
temperature. This thermostat will turn the microwave OFF. If the magnetron
overheat thermostat does trip, the microwave must be removed from the
aircraft, the outer wrap removed from the microwave, and the overheat
manually reset.
Liner Overheat Thermostat – This Overheat Thermostat is located on the
exterior surface of the stainless steel oven liner and senses the temperature
of the inside of the cooking chamber of the microwave oven. The liner
overheat thermostat will deactivate the microwave oven if the cooking
chamber gets too hot and will automatically reset when the microwave cools.
