Wolf WKGDX 126624, WKGX 126623, WKGC 126622, WKGCX 126625 Timer Cycle Roast & Hold Cooking

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

a.Solid state temperature control energized. If the oven temperature is below set point, the temperature control will energize its internal relay. The normally open (N.O.) contacts close and apply power to the following components:

a)Heat light (clear) comes ON.

b)Power is connected through the centrifugal switch contacts on the convection fan motor, heat relay (R3) is energized, (R3) contacts (N.O.) close and the heating circuit is powered.

c)Ignition control module is energized.

d)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.

A.Temperature control de-energizes internal relay and the normally open (N.O.) contacts OPEN.

1)Heat light goes out.

2)Power removed from heat relay (R3).

a.R3 normally open (N.O.) contacts OPEN.

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

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

5.The oven will continue to cycle on the temperature control until one of the following occurs: ROAST & HOLD time (R & H cooking) expires which allows the oven to go into Hold mode; Power switch (S1) is turned to the OFF or OVEN COOL position or the doors are opened.

Timer Cycle (Roast & Hold Cooking)

NOTE: The ROAST & HOLD timer operates independently of the heating cycle until time expires. Regulation of the oven temperature is then turned over to the Hold thermostat until one of the following occurs: ROAST & HOLD timer is turned OFF; function switch (S3) is turned back to Normal ROAST (normal cooking) or Power switch (S1) is turned to the OFF or OVEN COOL position.

1.With the power switch turned ON, power is supplied to timer.

2.Set ROAST & HOLD timer to desired time (Roast & Hold cooking).

NOTE: To Roast then Hold the cooked product at a fixed temperature, the Roast & Hold timer must be used and the function switch (S3) must also be set to Roast & Hold as indicated under step1 conditions for the Roast & Hold cycle.

A.Contacts 1 & 3 close, timer motor is energized and timing DOWN begins.

3.Time expires on Roast & Hold timer.

A.Contacts 1 & 3 open, timer motor is de- energized and timing stops.

B.Contacts 1 & 4 close.

1)If the oven was heating, then the gas burner and heat light go out; If the oven was not heating, then the gas burner and heat light remain out.

NOTE: The Temperature control board remains powered and the internal relay contacts remain closed as long as oven cavity temperature is below the 175°F minimum set point temperature of the board and power is ON.

2)Power is connected through function switch (S3) --- Hold relay (R2) is then energized, R2 contacts change state and the normally open (N.O.) contacts close.

F32700 (February 2006) Page 42 of 64