13
TROUBLESHOOTING
4b). Back-up toggle switch On
Circuit 1
24 volts (Blu # 12) through door switch to
motor contactor
coil.
Motor contactor closes, door switch closed, motor starts.
Motor centrifugal switch closes (for heat circuit).
Circuit 2
24 Volts to
Back-up thermostat
.
Temperature set on Back-up thermostat
24 volts from Back-up thermostat (Red # 21B) through safety thermostat, through motor
centrifugal switch, to main valve coil of
gas combination valve
.
Main valve opens.
Gas flows to main burners.
Main burners light.
ELECTRIC CONVECTION OVEN
1.)
Power switch turned on
Power to oven
light switch
.
208/240 volts to rows A and B of 24 pin
terminal block
.
240/208 to Line 3 points of
motor contactor
.
208/240 volts to terminal 1 on coil of
Back-up relay
.
240/24 volt transformer energized.
240/12 volt transformer energized.
24 volts to rows C and D of 24 pin
terminal block
.
24 volts through
door switch
to terminal 1 on coil of
motor contactor
.
24 volts to common connectors on
Back-up relay
.
12 volts to terminal 1 on
microprocessor
.
12 volts to center connector 1 of
Back-up toggle switch
.
208/240 volts to center connector 2 of
Back-up toggle switch
.
Reset circuit between power toggle switch and bottom of control panel closed (see page 9).
2A.) Back-up toggle switch Off
24 volts input to connector on
control panel
(see page 9).
12 volts to terminal 2 on
microprocessor
(see page 9).
Computer starts
Output from control panel to terminal 2 on coil of
motor contactor
(see page 9).
Motor contactor closes.
Motor starts.
24 volts through motor contactor points (from jumper on coil) to terminal 1 on coil of
heat
contactor
.
Product selected on control panel
24 volts from control panel through
Hi-limit thermostat
to terminal 2 on coil of
heat contactor
(see page 9).
Heat contactor closes.
208/240 volts to elements.
2B.) Back-up toggle switch On
208/240 volts to ternimal 2 on coil of
Back-up relay
.
