Wolf WKGCX 126625, WKGDX 126624, WKGX 126623 Full Size GAS Convection Ovens Electrical Operation

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

I.Oven doors Closed.

1)Door switch contacts CLOSED.

J.Oven cavity temperature below 140°F.

2.Power switch (S1) turned ON.

A.Power (120VAC) to computer control pin 3 (C3-3).

NOTE: Power at pin 3 is not transferred to other components until computer control is energized and operating conditions are met.

B.Power is available to the oven light switch (S2).

C.Power to terminal 1 on solid state relay 1 (SSR1 -load side) and solid state relay 2

(SSR2 -load side).

D.Component cooling fan energized.

E.Transformer (T1) is energized.

1)Power (24VAC) to one side of the following components: heat relay (R1) normally open (N.O.) contacts, high limit --- connected through the normally closed (N.C.) contacts to the 1st valve (safety) on the dual solenoid gas valve.

a.1st valve (safety) on the gas valve energized.

NOTE: Gas does not flow to the burner until the 2nd valve (main) is energized.

2)Power (24VAC) to the oven computer control.

a.Control is energized and performs a power ON self test before energizing outputs.

NOTE: If the control passes self test, then the outputs are energized and operation sequence continues. If control does not pass self test then the corresponding error code is displayed.

b.Computer control senses oven cavity temperature.

a)With the oven cavity temperature below set point, the controls 120VAC output from pin C3-2 is activated and power is connected to the common (C) side of the centrifugal switch contacts on the convection fan motor.

NOTE: The set point temperature of the computer control will be the last temperature that was set.

NOTE: Power is not applied to the heat relay coil (R1) until the centrifugal switch contacts on the convection fan motor close.

c.The controls 5VDC output from pins C2-2 (-) and C2-8 (+) is activated and SSR1 relay is energized.

a)Convection fan motor is energized (fan speed hi).

b)When the convection fan motor reaches operating speed, the centrifugal switch (N.O.) on the motor closes.

3)With the 120VAC output from the control activated and the centrifugal switch on the convection fan motor closed, power is applied to the heat relay coil (R1).

a.Heat relay coil (R1) is energized, (R1) contacts (N.O.) close and the heating circuit is powered.

b.Oven HEAT LIGHT on the control comes ON.

c.Ignition control module is energized.

a)No ignition light (red) comes ON, module performs a self diagnostic test for 4 seconds, 2nd valve (main) on the gas valve is energized. Gas starts to flow to the burner, sparking begins, the NO IGNITION light goes out and burner lights. Sparking continues for up to 7 seconds or until a flame is established. If a flame is SENSED, the NO IGNITION light stays out and burner remains lit.

If a flame is not SENSED after 7 seconds of sparking, the NO IGNITION light comes back on, 2nd valve (main) on the gas valve is de-energized and gas flow to the burner stops. Ignition trial cycle repeats after a 15 second purge between cycles for two additional tries before locking out. To reset after a lockout, turn power switch (S1) OFF then ON.

Page 45 of 64 F32700 (February 2006)