SSR1 & SSR2 (VC4GC/
6GC) .................
When SSR1 is energized by computer control, connects power to blower motor for Hi fan
speed operation in normal ROAST mode. In ROAST & HOLD Mode only, SSR1 is de-
energized and SSR2 is energized by computer control and connects power to blower
motor for Low fan speed operation.
Ignition Control
Module ...............
Controls the gas ignition cycle - Energizes the 2nd valve (main) on the dual solenoid gas
valve, generates spark for burner ignition, monitors the presence of a flame and controls
the No Ignition light. The ignition times are: 4 second self diagnostic test (initial power
ON); 7 second ignition trial; 3 ignition trials with a 15 second purge between each trial.
Igniter/Flame Sense ... Ignites the gas and senses the presence of a flame. The flame presence generates a
micro-amp "flame sense" current that is monitored by the ignition control module. A flame
sense current of 0.7 micro amp (minimum) is required to maintain burner ignition.
Power On Light ...... Lit whenever the power switch (S1) is turned to ON or Cool Down mode.
Heat Light ............ Lit whenever temperature control is calling for heat.
No Ignition Light ..... Lit when power is turned ON, during ignition trial & gas purge time and when no flame is
detected by flame sensor. If the oven fails to ignite after 3 attempts, it will remain lit until
power is reset.
Temperature Probe ... Senses the oven temperature for the solid state temperature control or the computer
control. On VC4GD/6D models, converts the temperature into a resistance valve which
is monitored by the temperature control board. The probe is an RTD (resistance
temperature detector) of the Thermistor type. As temperature increases the resistance
value decreases. On VC4GC/6C models, the probe is a J type thermocouple.
Gas Valve (Dual
Solenoid) .............
Allows gas flow to the burner when the 1st valve (safety) and 2nd valve (main) solenoid
coils are both energized.
Cooling Fan .......... Circulates cooler air from rear of oven forward to cool components in the control area.
Mechanical
Temperature Control
KX thermostat
(VC4GS/6GS) .........
Regulates the oven cavity temperature by controlling the heat relay (R3) through the
blower motor centrifugal switch contacts. On ROAST & HOLD models only, power is first
connected through one set of (R4) normally closed contacts (N.C.) then through the
centrifugal switch contacts on the motor.
Hold Thermostat (KX) ...Holds the oven cavity temperature at 160°F after ROAST (then hold) time expires. For
the oven to operate on the Hold thermostat, the ROAST & HOLD timer must be used and
the Function Switch (S3) must be set to. Available on models with Roast & Hold option
only.
COMPONENT LOCATION
Fig. 72
VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - ELECTRICAL OPERATION
F24682 Rev. C (0315) Page 38 of 74
