MARK V
2-5
COOK AND HOLD - 18791
Component Reference
NOTE: Refer to FIGURE 3 page 2-7 for compoĆ
nent locations.
1. MODE SELECTOR SWITCH
2. COOK TIMER
3. COOK TEMPERATURE CONTROL BOARD
4. HOLD TEMPERATURE CONTROL BOARD
5. AXIAL FAN
6. DPDT RELAY COIL
7. DOOR SWITCH
8. CONV ECTION FAN MOTOR
9. TEMPERATURE PROBE
10. SOLID STATE POTENTIOMETER
11. CENTRIFUGAL SWITCH
12. COOK LIGHT
13. ELEMENT CONTACTOR
14. HEATING ELEMENTS
15. TIMER MOTOR
16. BUZZER
17. COOK AND HOLD TIMER
18. COOK AND HOLD LIGHT
19. TEMPERATURE PROBE
20. SOLID STATE POTENTIOMETER
21. 50 WATT LAMPS
22. LIGHT SWITCH
Cook Operation
1. Turn the mode selector switch (1) to the cook
position. Power goes to terminal #1 of the
cook timer (2), terminals #6 and #8 of the cook
temperature control board (3), terminal #8 of
the hold temperature control board (4) and the
axial fan (5). Power is also applied to the N.C.
set of contacts in a DPDT relay (6).
NOTE: The coil of this relay will only be actiĆ
vated when the hold timer is set.
2. If the doors are closed the door switch (7)
should also be closed sending power to termiĆ
nal #3 of the mode selector switch (1). The
mode selector switch should already be made
between terminals #3 and N completing the
circuit to the convection fan motor (8).
NOTE: This motor has a built in centrifugal
switch (11) that closes when the motor
reaches full speed. If found faulty do
not bypass, the whole motor should be
replaced.
3. On a call for heat from the cook temperature
control system a circuit is completed between
terminals #6 and #7 of the temperature conĆ
trol board (3).
NOTE: The temperature control system conĆ
sists of the temperature probe (9), the
temperature control board (3) and the
solid state potentiometer (10)
Power is sent out of terminal #7 to the N.C. terĆ
minal of the DPDT relay (6). This relay should
be made between the N.C. terminal and the
common terminal sending power to 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.
4. When the cook timer (2) is set for a time a cirĆ
cuit is made between terminals #1 and #2
powering up the timer motor (15). At the expiĆ
ration of the set time the switch in the cook timĆ
er (15) toggles from 1-2 to 1-4 powering up
the buzzer (16).
NOTE: Put the timer in the home position to siĆ
lence the buzzer.
5. 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.
Cook and Hold Operation
1. Turn the mode selector switch (1) to the cook
and hold position. Power goes to terminal #1
of the cook and hold timer (17). When the cook
and hold timer is set power goes to terminal #6
of the hold temperature controller (4), the coil
of the DPDT relay (6) and the cook and hold
light (18). When the DPDT relay powers up the
switches in the relay toggle from the N.C. to the
N.O. position.
2. On a call for heat from the hold temperature
control system, a circuit is completed beween
terminals #6 and #7 of the hold temperature
control board (4).
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