POWER PANEL-PART REPLACEMENT
A. CONTACTOR
The 3-pole motor contactor is used
on units equipped with 3-phase motors. It is energized
when the power is on and the door is closed but also
when the door is open but the auxiliary fan switch is
depressed to the "ON" position.
To replace, remove the two mounting screws and
disconnect the leads.
B. RELAY
The S.P.S.T. relay provides power to the
blower motor, on units equipped with auxiliary fan
switch, in order to over-ride the door interlock.
To replace, follow item A procedure.
C. BUZZER
Signaled by the timer, the buzzer sounds
when the pre-set time is completed.
To replace, cut both wires approximately 3" from the
buzzer and strip the ends. Remove the bracket holding
the defective buzzer. Install the new buzzer equipped
with mounting bracket and lead, and connect the wires
with wire nuts.
D. CIRCUIT BREAKER
The circuit breakers in 208,
240, 480 volt models provide protection for the control
circuits and the lights. The circuit breakers are
constructed with internal time delay. They detect short
circuit or overload conditions in the equipment and trip
to "OFF" position.
E. TRANSFORMER
The control transformer is used
to step down the available supply voltage from 480 to
240 volt on the electric models and from either 480 or
240 to 120 volt on the gas models for the use of the
control and oven light circuits. The jumper straps (or
wires) are used to change the input and output
voltages to the required ratio. Below is the schematic
showing the 3 connections used in different models. In
replacing the old transformers with new ones care must
be taken to follow the required connections accurately.
SHUT-OFF VALVE SERVICE
The gas shut-off valve is located at the rear of the unit
and should be used to shut the unit down when service is
required to gas components. This valve should also be
used to turn all gas off to the unit when the unit is being
shut down for an extended period of time.
If the shut-off valve requires service this may be ac-
complished only by turning off the gas supply upstream
of the valve.
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