Repair manual

CTB and CTBR
3-7
TRIPLE SETPOINT THERMOSTAT - 22817 REV C
Component Reference
NOTE: Refer to FIGURE 14 page 3-14 for compoĆ
nent locations.
1. MODE SELECTOR SWITCH
2. COOL DOWN SWITCH
3. DOOR SWITCH
4. BLOWER MOTOR
5. TEMPERATURE CONTROL BOARD
6. SELECTOR SWITCH
7. MERCURY CONTACTOR
Operation
1. Power is delivered to various components
through the mode selector switch (1). When
the switch is turned to the cook position, power
is delivered to one terminal of a single pole
double throw cool down switch (2) and the
door switch (3).
2. If the door is closed, the door switch will also
be closed sending power to two other termiĆ
nals of the single pole double throw cool down
switch.
3. When the switch is in the position shown in
FIGURE 14, power is delivered to both the
blower motor (4) and to terminal 3 of the triple
set point temperature control board (5).
4. If the triple set point selector switch (6) is above
actual temperature, a set of contacts closes in
the control board sending power to the coil of
the mercury contactor (7).
NOTE: Should the temperature control board,
temperature probe or selector switch fail,
turning off a toggle switch on the board will
allow a backup thermostat to operate the
oven.