Wolf WKGX 126623, WKGDX 126624, WKGC 126622 Full Size GAS Convection Ovens Electrical Operation

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

J.Roast timer (normal cooking) in the OFF position.

K.Roast and Hold timer in the OFF position.

L.Oven doors Closed.

1)Door switch contacts CLOSED.

M.Oven cavity temperature below 140°F.

2.Set controlling thermostat to desired ROAST then Hold temperature (Roast & Hold cooking).

NOTE: This is considered first stage cooking in the ROAST & HOLD cycle.

A.Internal contacts close.

3.Power switch (S1) turned ON.

A.Power to motor speed (Hi/Low) relay (R1) normally open (N.O.) contacts and hold relay (R2) common (C).

B.Component cooling fan energized.

C.Power ON light (Amber) comes ON.

D.Power to one side of the following components: Normal ROAST timer terminal 1, ROAST & HOLD timer terminal 1, transformer primary (T1).

NOTE: Power is available to the oven light switch (wire #20) to turn the oven cavity lights ON when the light switch is turned ON; and power is available to the normally open N.O. side (wire #28) of the door switch contacts and connects power to additional components when the door switch contacts are CLOSED (door closed).

1)Transformer (T1) energized.

a.Power (24VAC) to one side of the following components: heat relay (R3) 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)With door switch closed, power is connected through a second set of contacts on the power switch (S1), through the thermostat contacts, through one set of relay R4 normally closed (N.C.) contacts, to one side of the centrifugal switch on the convection fan motor.

a.Heat light (clear) comes ON.

3)Power is also connected through the another set of relay R4 normally closed (N.C.) contacts to the other side of motor speed relay (R1).

a.Motor speed relay (R1) energized, contacts change state and the normally open (N.O.) set of contacts close.

a)Convection fan motor energized (fan speed low).

NOTE: In the ROAST & HOLD cycle, the fan speed is fixed at low.

b.When the convection fan motor reaches operating speed, the centrifugal switch on the motor closes. The heat relay (R3) is then energized, R3 relay contacts normally open (N.O.) close and the heating circuit is powered.

a)Ignition control module is energized.

b)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.

4.Oven reaches set temperature and controlling thermostat opens.

A.Heat light goes out.

B.Power removed from heat relay (R3).

Page 37 of 64 F32700 (February 2006)