OPERATION
2-8
SOLID STATE DIGITAL - 30070 REV B
Component Reference
NOTE: Refer to FIGURE 4 page 2-9 for compoĆ
nent locations.
1. MODE SELECTOR SWITCH
2. DOOR SWITCH
3. TIME AND TEMPERATURE CONTROLLER
4. AXIAL FAN
5. CENTRIFUGAL SWITCH
6. CONVECTION FAN MOTOR
7. HOT AIR ELEMENT CONTACTOR
8. HEATING ELEMENTS
9. TRANSFORMER
10. 50 WATT LAMPS
11. LIGHT SWITCH
Operation
1. Turn the mode selector switch (1) to the cook
position. Power goes to one terminal of the
door switch (2), terminal J8 of the temperature
controller (3), and the axial fan (4). The main
blower fan starts. If a temperature is proĆ
grammed into the controller, the power goes
from J9 to the centrifugal switch (5) in the conĆ
vection fan motor (6).
2. If the doors are closed, the door switch (2)
should also be closed, sending power to the
common terminal of the time and temperature
controller (3). The relay on this controller
should be closed since a temperature has
been programmed into the controller. A circuit
is made between common and N.O. sending
power to, and starting the convection fan moĆ
tor (6).
NOTE: The relay in the time and temperature
controller is not field repairable. If
diagnosed as defective, the entire
board must be replaced.
3. When the convection fan motor (6) reaches full
speed the centrifugal switch (5) closes sendĆ
ing power to the coil of the hot air element conĆ
tactor (7). When the contactor closes power is
sent to the heating elements (8).
4. The 50 watt lamps (10) only receive power when
the light switch (11) is activated. These lamps
are 115 volt and are wired in series parallel.
NOTE: Turn the mode selector switch to cool
down to bypass the door microswitch. This
allows the convection fan motor to operate
even when the doors are open.
NOTE: This oven may be converted from single to
three phase, however, contactors must be
changed due to the difference in amp
draw. Reference detail inset in FIGURE 4.
NOTE: The resistive values for the probes used in
this oven have descending temperature
coefficients. As the temperature increases
the resistive values decrease.
NOTE: Reference page 4-2 of the TroubleshootĆ
ing section for the reistive values of the
heating elements. The reading should be
taken in a cold state.
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