Table of Contents
Advertisement
WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATION
SSR1 & SSR2 (WKGC/
WKGCX) . . . . . . . . . . . . .
Ignition Control
Module . . . . . . . . . . . . . . .
Igniter/Flame Sense . . . Ignites the gas and senses the presence of a flame. The flame presence generates a
Power On Light . . . . . .
Heat Light . . . . . . . . . . . .
No Ignition Light . . . . .
Temperature Probe . . .
Gas Valve (Dual
Solenoid) . . . . . . . . . . . . .
Cooling Fan . . . . . . . . . .
Mechanical
Temperature Control
KX thermostat WKG/
WKGX . . . . . . . . . . . . . . . .
Hold Thermostat (KX) . . . Holds the oven cavity temperature at 160°F after ROAST (then hold) time expires. For
F32700 Rev. B (0315)
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.
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.
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.
Lit whenever the power switch (S1) is turned to ON or Cool Down mode.
Lit whenever temperature control is calling for heat.
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.
Senses the oven temperature for the solid state temperature control or the computer
control. On WKGD/WKGDX 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 WKGC/WKGCX models, the probe is a J type thermocouple.
Allows gas flow to the burner when the 1st valve (safety) and 2nd valve (main) solenoid
coils are both energized.
Circulates cooler air from rear of oven forward to cool components in the control area.
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.
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
Page 38 of 74
Fig. 72
Advertisement
Table of Contents
