Wolf WKG 126620, WKGDX 126624, WKGX 126623, WKGC 126622, WKGCX 126625 Roast and Hold Cycle

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

Roast and Hold Cycle

NOTE: Refer to the Owner's Manual for a detailed explanation of ROAST & HOLD cooking.

1.Conditions.

A.Oven connected to correct voltage.

1)L1 (HOT) to power switch (S1).

2)L2 (NEUTRAL or SECOND LINE) to one side of the following components: power ON light, heat light, temperature control board terminal 9 (120VAC) or terminal 10 (208- 240VAC), oven cavity lights, buzzer, ROAST timer motor (normal cooking), ROAST & HOLD timer motor, heat relay coil (R3), convection fan motor common (C), transformer primary (T1), motor speed (Hi/Low) relay coil (R1), hold relay coil (R2) and the component cooling fan.

B.Oven properly grounded.

C.Gas supply valve ON.

D.Gas combination control valve ON.

E.Power switch (S1) OFF.

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

G.Oven light switch (S2) ON/OFF (position has no affect on the function of the ROAST & HOLD cycle).

H.Temperature control dial set to lowest temperature (fully counterclockwise).

I.High limit switch CLOSED.

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 temperature control dial to desired ROAST then Hold temperature (Roast & Hold cooking).

3.Power switch (S1) turned ON.

A.Component cooling fan energized.

B.Power ON light (Amber) comes ON.

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

a.Motor speed relay (R1) is energized through hold relay

(R2) normally closed contacts (N.C.). Relay contacts (R1) change state and the normally open (N.O.) set of contacts close.

a)Power is connected through the function switch (S3) contacts and convection fan motor is 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 (N.O.) on the motor closes.

c)Power to normally open (N.O.) side of internal relay contacts (terminal 7) on the temperature control board.

3)Power is also connected back through a second set of contacts on the power switch (S1) to terminal 8 on the temperature control board.

Page 41 of 64 F32700 (February 2006)