OPERATION
2-6
NOTE: The hold temperature control system
consists of the temperature probe (19),
the hold temperature control board (4)
and the solid state potentiometer (20).
Power goes to the N.O. terminals of the DPDT
relay (6). Circuits should be made between the
N.O. and common terminals of the DPDT relay
(6) allowing power to run to the convection fan
motor (8) and one side of the centrifugal switch
(11). If the convection fan motor (8) is at full
speed the centrifugal switch (11) closes sending
power to the cook light (12) and one side of the
element contactor (13). When the contactor
closes the heating elements (14) power up.
NOTE: In cook and hold mode only, the conĆ
vection fan cycles on and off with the
hold thermostat system.
3. The 50 watt lamps (21) only receive power when
the light switch (22) is activated. These lamps
are 115 volt and are wired in series parallel.
NOTE: The potentiometer and probes for cook
and cook & hold are identical. The cook
and cook & hold temperature boards are
NOT interchangeable.
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 3.
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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