Wolf WKG 126620, WKGDX 126624 Blower Motor, Motor Speed Relay R1, Solid State Temperature Control

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

Blower Motor	Operates the oven cavity blower (convection fan). Also, an internal
	centrifugal switch on the motor is utilized to allow the connection of power
	to the heat relay (R3) when the motor is at operating speed.
Motor Speed Relay (R1)	Supplies power to the blower motor through (R1) relay contacts. Available
	on models with Roast & Hold option only.

Hold Relay (R2) . . . . . . . . . . . . . . . . Hold relay (R2) supplies power to the Hold thermostat for maintaining the fixed hold temperature in the oven cavity, after the ROAST & HOLD time expires.

Transformer (T1) . . . . . . . . . . . . . . . Provides 24VAC power to the ignition control module and heating circuit.

Solid State Temperature Control

(WKGD/WKGDX) . . . . . . . . . . . . . . . Monitors temperature sensor and regulates the oven cavity temperature by controlling the heat relay (R3) through the blower motor centrifugal switch contacts.

High Limit Thermostat . . . . . . . . . . Protects the oven from temperatures above 550°F by removing power from the 1st valve (safety) on the dual solenoid gas valve which stops the flow of gas to the burner. Auto resets at 500°F.

Computer Control

(WKGC/WKGCX) . . . . . . . . . . . . . . . Monitors temperature sensor and regulates the oven cavity temperature by controlling the heat relay (R1) through the blower motor centrifugal switch contacts. Also, counts the ROAST time (normal cooking) of the product and signals the electronic alarm at the end of the cycle. If ROAST & HOLD mode is selected, when the ROAST (then hold) time expires, the oven heating stops and the oven enters HOLD mode. Once the oven cavity temperature drops to 150°F, the heat comes back on and the oven cycles at this temperature to hold the cooked product. Roast & Hold is standard on computer models.

SSR1 & SSR2 (WKGC/WKGCX) . . 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 Oven Cool 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.

Page 29 of 64 F32700 (February 2006)