Wolf WKGX 126623, WKGDX 126624, WKGC 126622 Oven Cool Cycle Solid State Temperature Control

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

a.Power to one side of hold thermostat.

NOTE: When temperature is above 160°F (±12) the hold thermostat contacts are open.

3)Motor speed relay (R1) de-energized, (R1) contacts change state and the normally open (N.O.) contacts OPEN.

a.Convection fan motor stops and centrifugal switch (N.O.) on motor OPENS.

a)Heat relay (R3) de- energized, relay (R3) contacts open and oven heating stops.

NOTE: This is considered second stage cooking in the ROAST & HOLD cycle where the stored heat in the oven continues to cook the product.

4.Oven temperature falls below 160°F (±12) and hold thermostat contacts close.

A.Heat light comes ON.

B.Motor speed relay (R1) is energized, (R1) contacts change state and the normally open (N.O.) contacts CLOSE.

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

C.Power is also applied to one side of the centrifugal switch on the convection fan motor through the temperature control internal relay (N.O.) contacts.

D.When the convection fan motor reaches operating speed, the centrifugal switch on the motor closes.

1)Heat relay (R3) is energized.

a.Heat relay (R3) contacts (N.O.) close and the heating circuit is powered.

a)Ignition 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.

5.Oven reaches the FIXED hold temperature and hold thermostat opens.

A.Heat light goes out.

B.Power removed from heat relay (R3) and the contacts open (N.O.).

1)Ignition control module de-energized.

a.Power removed from 2nd valve (main) on the gas valve and gas flow to the burner stops.

C.Power is also removed from motor speed relay (R1).

1)Convection fan motor de-energized and fan stops rotating.

6.The oven will continue to cycle on the hold thermostat until the ROAST & HOLD timer is turned to the OFF position and the function switch (S3) is change back to ROAST (normal cooking) or the power switch (S1) is turned to the OFF or OVEN COOL position.

Oven Cool Cycle (Solid State Temperature Control)

NOTE: The electrical sequence of operation for the OVEN COOL cycle is written for ovens with the ROAST & HOLD option.

1.Conditions.

A.Oven is ON.

B.Oven cavity temperature needs to be lowered.

C.Doors are open.

1)Door switch contacts OPEN.

D.Roast and Hold timer in the OFF position.

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

F.Function switch (S3) set to either Normal ROAST cycle or ROAST & HOLD cycle.

Page 43 of 64 F32700 (February 2006)