Wolf Convection Oven WKG 126620 User Manual

SERVICE MANUAL

WKG SERIES

FULL SIZE

GAS CONVECTION OVENS

MODEL

WKG

126620

126621

126622

126623

126624

126625

WKGD

WKGC

WKGX

WKGDX

WKGCX

WKGD2 WITH ROAST & HOLD

SHOWN

- NOTICE -

This Manual is prepared for the use of trained Wolf Range Service

Technicians and should not be used by those not properly qualified. If

you have attended a Wolf Range Service School for this product, you

may be qualified to perform all the procedures described in this manual.

This manual is not intended to be all encompassing. If you have not

attended a Wolf Range Service School for this product, you should read,

in its entirety, the repair procedure you wish to perform to determine if

youhavethenecessarytools, instrumentsandskillsrequiredtoperform

the procedure. Procedures for which you do not have the necessary

tools, instruments and skills should be performed by a trained Vulcan

Service Technician.

Reproduction or other use of this Manual, without the express written

consent of Wolf Range, is prohibited.

For additional information on Wolf Range or to locate an authorized parts and service

provider in your area, visit our website at www.wolfrange.com.

WOLF RANGE

DIVISION OF ITW FOOD EQUIPMENT GROUP, LLC

LOUISVILLE, KY 40201-0696

F32700 (February 2006)

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS

Computer Control (WKGC/WKGCX) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Computer Control Calibration (WKGC/WKGCX) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

ELECTRICAL OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Component Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Component Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

WKG, WKGX with Roast & Hold Option (Mechanical KX Thermostat) . . . . . . . . . . . . . . . . . . . . . . . . . 35

WKGD, WKGDX with Roast & Hold Option (Solid State Temperature Control) . . . . . . . . . . . . . . . . . . . 39

Oven Cool Cycle (Solid State Temperature Control) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

WKGC, WKGCX (Roast & Hold Standard on Computer Model) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Oven Cool Cycle (Computer Control Model) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

SCHEMATICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

WKG, WKGX Mechanical (KX) Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

WKG, WKGX Mechanical (KX) Controls, Roast & Hold Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

WKGD, WKGDX Solid State Temperature Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

WKGD, WKGDX Solid State Temperature Control, Roast & Hold Option . . . . . . . . . . . . . . . . . . . . . . . 50

WKGC, WKGCX Computer Control (Roast & Hold Standard) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

WIRING DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

WKG, WKGX Mechanical (KX) Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

WKG, WKGX Mechanical (KX) Controls, Roast & Hold Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

WKGD, WKGDX Solid State Temperature Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

WKGD, WKGDX Solid State Temperature Control, Roast & Hold Option . . . . . . . . . . . . . . . . . . . . . . . 58

WKGC, WKGCX Computer Control (Roast & Hold Standard) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

All Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Computer Control Models Only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

CONDENSED SPARE PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Page 3 of 64

F32700 (February 2006)

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVEN - GENERAL

GENERAL

INTRODUCTION

Procedures in this manual will apply to all models unless specified. Pictures and illustrations can be of any model

unless the picture or illustration needs to be model specific.

Models

FEATURES

OPTIONS

NORMAL

TIMER OR

HOLD

MODEL

NORMAL

(ROAST)

TIMER

ROAST

HOLD

CAVITY TEMPERATURE

DOORS

(50/50)

BLOWER

208/240/60/1

DEPTH

CONTROL

TIMER

26.5"

30.5"

26.5"

30.5"

26.5"

Mechanical (KX) Independent ^{1, 2}

1-Hour Dial 5-Hour Dial Optional

Optional

WKG

WKGX

WKGD

WKGDX

WKGC

Solid State

Computer

Independent ^{1, 3}

24-Hour

Digital

Built in

30.5"

Computer

Independent ^{1, 3}

24-Hour

Digital

Built in

Optional

WKGCX

1. Simultaneous doors are optional (with or w/o window).

2. Stainless steel doors w/o window (standard).

3. Stainless steel doors with window (standard).

Input BTU Rating

Natural Gas - 44,000 BTU input at 3.5 in. W.C.

INSTALLATION

Refer to the Owner's Manual for detailed installation

instructions on single or stacked ovens.

Propane Gas - 44,000 BTU input at 10.0 in. W.C.

Gas Line Pressures

OPERATION

Natural - Recommend (in. W.C.) 7.0, Min 5.0

Propane - Recommend (in. W.C.) 11.0, Min 11.0

Maximum 14.0 in. W.C. (Nat. or Prop.)

Refer to the Owner's Manual for specific operating

instructions.

CLEANING

TOOLS

Refer to the Owner's Manual for specific cleaning

instructions.

Standard

! Standard set of hand tools.

LUBRICATION

! VOM with A.C. current tester (Any quality VOM

with a sensitivity of at least 20,000 ohms per volt

can be used).

! Cavity blower motor has sealed bearings and

requires no additional lubrication.

! Gear Puller to remove blower

Special

! Huskey’s TF1000 grease or equivalent high

temperature Teflon grease.

! Temperature tester (thermocouple type).

! Manometer

SPECIFICATIONS

Electrical

Voltage - 120/60/1

Amps

- 9.0 Amps

F32700 (February 2006)

Page 4 of 64

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS

REMOVAL AND REPLACEMENT OF PARTS

COVERS AND PANELS

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT

/ TAGOUT PROCEDURES.

Top Front Cover

1. The top front cover is secured with four (4)

screws, two on each side of cover. Remove these

screws then remove the cover from the oven.

NOTE: If the oven has a mechanical (KX type)

thermostat, it must be removed from the control

panel first, before removing the control panel.

2. Disconnect the temperature probe leads from the

solid state temperature control.

3. Unplug the wire harness connector to the control

panel components.

4. Reverse the procedure to install.

Right Side Panel

1. Remove the screws which secure the right side of

the top front cover, bottom front cover and control

panel.

2. Reverse the procedure to install.

Bottom Front Cover

2. Remove the remaining six screws securing the

right side panel.

1. The bottom front cover is secured with four (4)

screws, two on each side of cover. Remove these

screws then remove the cover from the oven.

2. Reverse the procedure to install.

Control Panel

1. Remove three (3) screws on the right side which

secure the control panel then pull the panel away

from the oven.

3. Pull the right side panel out at the bottom then

down to remove.

4. Reverse the procedure to install.

Page 5 of 64

F32700 (February 2006)

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS

CONTROL PANEL

COMPONENTS

Removable Components Procedure

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

1. Remove the control panel as outlined under

COVERS AND PANELS.

2. Remove the component being replaced.

3. Reverse the procedure to install the replacement

component, then check oven for proper

operation.

F32700 (February 2006)

Page 6 of 64

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS

COMPONENT PANEL

COMPONENTS

Removable Components Procedure

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

1. Remove the right side panel as outlined under

COVERS AND PANELS.

NOTE: If right side panel is not accessible, this

component can be serviced by removing the control

panel as outlined under COVERS AND PANELS.

2. Disconnect the wire leads to the component

being replaced.

3. Remove the component.

4. Reverse the procedure to install the replacement

component and check oven for proper operation.

Page 7 of 64

F32700 (February 2006)

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS

7. Adjust the temperature control as outlined under

TEMPERATURE PROBE

SOLID STATE TEMPERATURE CONTROL

CALIBRATION (WKGD/WKGDX) in SERVICE

PROCEDURES AND ADJUSTMENTS.

(WKGD/WKGDX)

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

GAS BURNER

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

1. Remove the right side panel as outlined under

COVERS AND PANELS.

NOTE: If right side panel is not accessible, this

component can be serviced by removing the control

panel as outlined under COVERS AND PANELS.

WARNING: SHUT OFF THE GAS BEFORE

SERVICING THE UNIT.

1. Remove the lower front cover as outlined under

COVERS AND PANELS.

2. Disconnect the probe leads from the temperature

control.

2. Disconnect the ignition cable and the flame sense

lead wire.

3. Remove the racks and right rack support.

4. Remove probe clips from probe.

3. Remove the bolts securing the gas manifold and

place manifold aside.

5. Push the probe through the opening in cavity side

wall and into the control panel area.

4. Remove the screws securing the burner cover

then lift out.

5. Grasp the burner and lift out.

NOTE: The hole in the oven cavity wall does not line

up straight with the oven cavity outer shell, therefore

the probe must be removed at an angle.

6. Reverse the procedure to install the replacement

probe.

F32700 (February 2006)

Page 8 of 64

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS

4. Reverse procedure to install and check for proper

operation.

6. Reverse procedure to install the replacement

burner.

GAS SOLENOID VALVE

NOTE: Ensure that burner positioning bracket (U

shaped end) is inserted into slot at the rear of the

burner chamber.

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

7. Check for proper operation.

GAS ORIFICE

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

WARNING: SHUT OFF THE GAS BEFORE

SERVICING THE UNIT.

WARNING: ALL GAS JOINTS DISTURBED

DURING SERVICING MUST BE CHECKED FOR

LEAKS. CHECK WITH A SOAP AND WATER

SOLUTION (BUBBLES). DO NOT USE AN OPEN

FLAME.

WARNING: SHUT OFF THE GAS BEFORE

SERVICING THE UNIT.

1. Remove the bottom front cover as outlined under

COVERS AND PANELS.

1. Remove the control panel and the right side panel

as outlined under COVERS AND PANELS.

2. Remove the bolts securing the gas manifold to

the oven and place the manifold to the side.

NOTE: If right side panel is not accessible, this

component can be serviced by removing the control

panel as outlined under COVERS AND PANELS.

2. Disconnect the lead wires.

3. Disconnect the compression fittings to the valve.

3. Remove the gas orifice from the spud on the

manifold and replace with the correct orifice for

the given altitude.

Page 9 of 64

F32700 (February 2006)

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS

4. Loosen the bolts securing the valve and bracket

assembly then remove the screws securing the

valve to the bracket.

3. Disconnect the lead wires and igniter cable from

the ignition module board.

5. Reverse the procedure to install the replacement

gas valve.

NOTE: Clean the pipe threads and apply pipe joint

compound to threads. Any pipe joint compound

used, must be resistant to the action of propane

gases.

6. Verify gas pressure as outlined under GAS

PRESSURE ADJUSTMENT in SERVICE

PROCEDURES AND ADJUSTMENTS and check

for proper operation.

IGNITION CONTROL MODULE

4. Remove the ignition module board from the

mounting bracket.

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

5. Reverse the procedure to install the replacement

ignition module board.

SPARK IGNITER AND

FLAME SENSE

WARNING: SHUT OFF THE GAS BEFORE

SERVICING THE UNIT.

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

1. Remove the right side panel as outlined under

COVERS AND PANELS.

NOTE: If right side panel is not accessible, this

component can be serviced by removing the control

panel as outlined under COVERS AND PANELS.

WARNING: SHUT OFF THE GAS BEFORE

SERVICING THE UNIT.

2. Loosen the screws securing the mounting bracket

to the component panel and remove the bracket.

1. Remove the gas burner as outlined under GAS

BURNER.

2. Remove the screws securing the ignitor and

flame sense to burner then remove the assembly.

F32700 (February 2006)

Page 10 of 64

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS

3. Reverse the procedure to install the assembly

and check for proper operation.

NOTE: Check to ensure the spark gap distance is

approximately 1/8". If the gap appears to be

excessive or poor sparking is occurring then adjust.

3. Remove screws securing baffle panel and

remove the panel.

BLOWER AND MOTOR

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

WARNING: SHUT OFF THE GAS BEFORE

SERVICING THE UNIT.

4. If replacing:

A. Blower Only - Loosen set screws on blower

hub and using a bearing puller, remove blower

from motor shaft.

1. Take out the racks and rack supports.

2. Remove screws securing the SNORKEL and

remove the snorkel.

1) Reverse procedure to install and adjust

blower position as outlined under

BLOWER ADJUSTMENT in SERVICE

PROCEDURES AND ADJUSTMENTS.

B. Motor - perform step 4A and continue

procedure.

5. Remove the screws securing the air baffle to the

rear wall at the lower right hand corner.

Page 11 of 64

F32700 (February 2006)

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS

NOTE: Check data plate on motor for wiring

schematic. The motor must rotate clockwise when

viewed from the shaft end.

6. Remove the nuts that secure the motor mounting

plate to the rear wall.

13. Slide blower onto motor shaft until hub is flush

with end of shaft then tighten set screws.

14. Adjust motor position until blower is parallel to

motor mounting plate as outlined under

BLOWER ADJUSTMENT in SERVICE

PROCEDURES AND ADJUSTMENTS.

15. Position motor mounting plate on the rear wall

and secure with nuts and washers.

16. Replace the baffle panel and SNORKEL.

17. Replace the air baffle on the rear wall at the

lower right hand corner.

18. Remove cardboard from the bottom of the

oven cavity.

19. Install rack guides and racks.

20. Check oven for proper operation.

OVEN DOORS AND BEARINGS

7. Place a piece of cardboard on the bottom of the

(INDEPENDENT DOORS)

oven cavity to protect its surface from any

damage during motor assembly removal.

8. Pull the motor assembly into the oven cavity and

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

place it on the cardboard.

9. Remove the junction box cover from the motor,

disconnect lead wires and remove the conduit.

10. Remove motor mounting bolts and flat

washers then lift the motor from the mounting

plate.

1. Remove the top front cover and bottom front

cover as outlined under COVERS AND PANELS.

11. Position the replacement motor on the motor

mounting plate and install mounting bolts and

washers. Hand tighten mounting bolts only.

12. Reconnect lead wires at the motor, replace

conduit and junction box cover.

F32700 (February 2006)

Page 12 of 64

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS

2. Remove the door switch lever.

8. Reverse procedure to install door assembly and

check for proper adjustment as outlined under

DOOR ADJUSTMENT and DOOR SWITCH

ADJUSTMENT in SERVICE PROCEDURES

AND ADJUSTMENTS.

OVEN DOORS

(SIMULTANEOUS DOORS)

Assembly Removal

3. Remove the lower door seal strip to expose the

mounting screws of the door assembly.

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

4. Remove the two (2) lower sill bolts by the lower

door shaft and the four (4) counter-sunk screws

from the lower sill.

1. Remove the top front cover and bottom front

cover as outlined under COVERS AND PANELS.

2. Remove the door switch lever.

NOTE: The door assembly is heavy and will drop

down once the last screw is removed. If removing

door assembly with-out assistance, the ignition

cable, flame sense lead and gas manifold should

also be removed to avoid damage to these

components.

3. Remove the top bearing retainers and top

bearings.

5. Tilt the top of the door slightly forward and lift the

door up until the bottom of the door shaft clears

the opening in the sill.

6. Lay the door flat to prevent damage.

7. The top and bottom bearings are now accessible

for inspection and/or replacement if needed.

A. If bearings are ok, proceed to step 8.

B. If replacing the top bearing, remove the top

bearing retainer and top bearing.

4. Remove the lower door seal strip to expose the

mounting screws of the door assembly.

A. Remove the two (2) lower sill bolts by the

lower door shaft and the four (4) counter-sunk

screws from the lower sill.

If replacing the bottom bearing, remove it

from the door shaft or the lower sill

opening.

Page 13 of 64

F32700 (February 2006)

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS

NOTE: The door assembly is heavy and will drop

DOOR CATCH BALL ASSEMBLY

(INDEPENDENT DOORS)

down once the last screw is removed. If removing

door assembly with-out assistance, the ignition

cable, flame sense lead and gas manifold should

also be removed to avoid damage to these

components.

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

5. Lift up on the door assembly and swing the right

side out then move the assembly to the left to

clear the slots in the upper door sill.

6. Lay the door assembly on a flat cushioned

surface for disassembly.

1. Remove the top front cover as outlined under

COVERS AND PANELS.

7. Reverse procedure to install door assembly and

check for proper adjustment as outlined under

DOOR ADJUSTMENT, DOOR CHAIN

2. Remove the screws that secure the door catch

assembly.

ADJUSTMENT (SIMULTANEOUS DOORS) and

DOOR SWITCH ADJUSTMENT in SERVICE

PROCEDURES AND ADJUSTMENTS.

Disassembly

1. Remove the door assembly as outlined in OVEN

DOORS (SIMULTANEOUS) under ASSEMBLY

REMOVAL.

2. Remove the door chain by loosening one of the

turnbuckles.

3. Loosen the set screw on the sprocket of door

being replaced.

4. Drive out the spiral pin from the sprocket of door

being replaced.

5. Remove the door from lower sill bearings and

sprocket.

3. Reverse procedure to install.

4. Adjust the ball catch as outlined under DOOR

CATCH BALL ADJUSTMENT (INDEPENDENT

DOORS) in SERVICE PROCEDURES AND

ADJUSTMENTS.

DOOR WINDOW

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

1. Remove the screws at the top and bottom of

door.

A. Door assembly parts are now accessible for

inspection and/or replacement if necessary.

6. Reverse procedure to re-assemble the door

assembly parts and check for proper adjustment

as outlined under DOOR CHAIN ADJUSTMENT

(SIMULTANEOUS DOORS) in SERVICE

PROCEDURES AND ADJUSTMENTS.

F32700 (February 2006)

Page 14 of 64

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS

2. Independent doors:

A. Remove the door handle then remove the

outer door panel.

B. Lift out the inner door panel and window

assembly.

NOTE: Left door only - remove door seal from the

inside edge of the door.

5. Reverse procedure to install the replacement

window.

3. Simultaneous doors:

DOOR SWITCH

A. If replacing window on the left door, remove

the handle from the front of the door then

remove door seal from the inside edge of the

door.

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

1) Lift out the inner door panel and window

assembly.

2) If replacing window on the right door,

remove the screws along the inside edge

(if applicable) of the door then remove the

inner door panel and window assembly.

1. Remove the top front cover as outlined under

COVERS AND PANELS.

2. Disconnect the lead wires to the door switch.

3. Remove the switch.

4. Remove the screws securing the window TABS

to the door bracket and lift the window assembly

out from the door frame.

4. Reverse procedure to install the replacement

switch and check for proper adjustment as

outlined under DOOR SWITCH ADJUSTMENT in

SERVICE PROCEDURES AND

ADJUSTMENTS.

Page 15 of 64

F32700 (February 2006)

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS

MECHANICAL KX THERMOSTAT

(WKG/WKGX)

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

1. Remove the racks and right rack support.

2. Remove the thermostat knob and mounting

screws from the control panel and then remove

3. Disconnect lead wires from high limit thermostat

then remove high limit thermostat from

cover/mounting plate.

the control panel.

3. Remove the probe guard from the oven cavity

wall.

NOTE: When installing, the probe should not extend

beyond the probe guard.

4. Remove the thermostat bulb from the oven cavity

by pushing it through the oven wall and into the

control panel area.

NOTE: The hole in the oven cavity wall does not line

up straight with the oven cavity outer shell, therefore

the probe must be removed at an angle.

5. Reverse the procedure to install.

6. Adjust the thermostat as outlined under

MECHANICAL THERMOSTAT CALIBRATION

(WKG/WKGX) in SERVICE PROCEDURES AND

ADJUSTMENTS.

HIGH LIMIT THERMOSTAT

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

NOTE: Remove the old RTV from the cover and

mating surfaces inside the oven cavity and apply

new RTV before installing.

4. Reverse procedure to install.

INTERIOR LIGHTS

1. Take out racks from the oven.

2. Remove the high limit thermostat cover/mounting

plate from inside the oven cavity at the top.

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

Lamp

1. Remove the racks.

2. Unscrew the glass lens for the light being

replaced then unscrew the bulb.

3. Replace bulb then reverse the procedure to

install.

F32700 (February 2006)

Page 16 of 64

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS

COOLING FAN

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

1. Remove the right side panel as outlined under

Lamp Assembly

COVERS AND PANELS.

NOTE: If right side panel is not accessible, this

component can be serviced by removing the control

panel as outlined under COVERS AND PANELS.

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

2. Disconnect the lead wires to the fan motor by

removing wire nuts.

3. Remove the screws securing the air deflector to

the fan then loosen the tab screw holding the fan

to the component panel. Rotate the tab so that

the fan will clear and remove the fan.

1. Remove the lens and bulb.

2. Remove the springs from the retaining tabs (2

places) on the socket.

3. Depress the retaining tabs and pull the socket out

from the oven, far enough to disconnect the lead

wires.

4. Remove the socket from the oven.

4. Reverse the procedure to install the replacement

fan and check for proper operation.

5. Attach the lead wires to the replacement socket.

6. Insert the socket into the hole in the oven and

push until the socket is held in place by the

retaining tabs.

NOTE: The fan must be installed so air is pulled from

the rear of the oven and blown into the control area.

The arrow on the fan body indicates AIR FLOW

direction and should be pointing toward the controls.

7. Install the light bulb and lens.

8. Check for proper operation.

NOTE: Ensure fan is seated SQUARELY against the

air tube and the oven bottom.

NOTE: The air deflector should be angled upwards

at approximately 30 degrees to properly direct the air

flow.

Page 17 of 64

F32700 (February 2006)

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS

SERVICE PROCEDURES AND ADJUSTMENTS

WARNING: CERTAIN PROCEDURES IN THIS SECTION REQUIRE ELECTRICAL TEST OR MEASUREMENTS

WHILE POWER IS APPLIED TO THE MACHINE. EXERCISE EXTREME CAUTION AT ALL TIMES. IF TEST

POINTS ARE NOT EASILY ACCESSIBLE, DISCONNECT POWER AND FOLLOW LOCKOUT/TAGOUT

PROCEDURES, ATTACH TEST EQUIPMENT AND REAPPLY POWER TO TEST.

A. If the average temperature is less than

SOLID STATE TEMPERATURE

10 °F from the dial setting, the thermostat

is properly calibrated.

CONTROL CALIBRATION

(WKGD/WKGDX)

B. If the average temperature is more than

10 °F from the dial setting, the thermostat

calibration must be adjusted.

1. Place a thermocouple in the geometric center of

the oven cavity.

1) Loosen the temperature control knob

set screw and remove the knob from

the stem.

2. Set the ON-OFF-OVEN COOL switch to ON.

3. Set the temperature control dial to 350°F.

2) Loosen temperature control mounting

screws only enough to rotate the

control.

4. Allow the oven temperature to stabilize

(normally 3 cycles).

5. Record the temperature at which the Heat lamp

goes OFF and comes ON for at least two

complete heating cycles.

a. Place thumb and forefinger on

the head of the mounting screws,

apply pressure and slightly rotate

the screw heads (body of control)

in the slot. Rotate clockwise to

increase temperature and

6. Calculate the differential by subtracting the

temperature indicated when the lamp goes out

from the temperature indicated when the lamp

comes on.

counterclockwise to decrease.

b. Center the stem in the opening

and re-tighten the temperature

control mounting screws.

A. The differential calculated should be less

than 20 °F.

c. Replace knob and re-tighten set

screw .

1) If the differential is less than 20 °F, the

temperature control circuit is

functioning properly.

d. Rotate the knob to the lowest

temperature setting then back to

350°F.

a. Proceed to step 7.

e. Repeat the average temperature

calculation in step 7.

2) If the differential is more than 20 °F:

a. Check the temperature probe as

outlined under TEMPERATURE

PROBE TEST

NOTE: Allow the oven to cycle at

least two times between

adjustments before performing

the calculation.

(WKGD/WKGDX).

b. If the probe is functioning

properly then temperature control

is malfunctioning.

a) If the average temperature

still differs more than 10 °F

from the dial setting, adjust

the thermostat calibration

until the average

a) Install a replacement

temperature control and

check calibration.

temperature is within

tolerance.

7. Calculate the average temperature by adding

the temperature indicated when the lamp goes

out to the temperature indicated when the lamp

comes on and dividing this answer by 2.

C. If the above adjustment cannot be

obtained, replace the temperature control

and check calibration.

F32700 (February 2006)

Page 18 of 64

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS

NOTE: Allow the oven to cycle at least two times

MECHANICAL THERMOSTAT

between adjustments before performing the

calculation.

CALIBRATION (WKG/WKGX)

9. If the above adjustment can not be obtained,

1. Place a thermocouple in the geometric center of

install a replacement thermostat and check

the oven cavity.

calibration.

2. Set the ON-OFF-OVEN COOL switch to ON.

3. Set the thermostat dial to 350°F.

4. Allow the oven temperature to stabilize

(normally 3 cycles).

5. Record the temperature when the thermostat

cycles OFF and ON for at least three complete

cycles.

6. Calculate the differential by subtracting the

temperature indicated when heat lamp goes out

from temperature indicated when heat lamp

comes on.

A. The differential calculated should be less

than 30EF.

1) If the differential is less than 30° F, the

thermostat is functioning properly.

a. Proceed to step 7.

2) If the differential is more than 30EF,

the thermostat is malfunctioning.

SOLID STATE TEMPERATURE

a. Install a replacement thermostat

and check calibration.

CONTROL TEST

7. Calculate the average temperature by adding

(WKGD/WKGDX)

the temperature indicated when the heat lamp

goes out to the temperature indicated when the

WARNING: DISCONNECT THE

heat lamp comes on and dividing this answer by

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

A. If the average temperature is less than

1. Remove the right side panel as outlined under

15EF from the dial setting, the thermostat is

properly calibrated.

COVERS AND PANELS in REMOVAL AND

REPLACEMENT OF PARTS.

B. If the average temperature is more than

NOTE: If right side panel is not accessible, this

component can be serviced by removing the control

panel as outlined under COVERS AND PANELS.

15EF of the dial setting, the thermostat

calibration must be adjusted.

1) Remove the thermostat knob.

2. Place a thermocouple in the geometric center of

the oven cavity.

2) Hold the thermostat shaft and turn the

inner set screw clockwise to decrease

temperature or counterclockwise to

increase temperature (1/4 turn =

35EF).

NOTE: Oven temperature must be below 450°.

NOTE: If oven is equipped with the Roast and Hold

option, turn it to Normal ROAST (normal cooking)

before continuing.

8. Replace the knob and repeat step 7 until the

average temperature is within tolerance.

3. Set the temperature control to the maximum

setting.

Page 19 of 64

F32700 (February 2006)

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS

4. Check machine data plate for correct voltage to

oven. Refer to diagram below for proper

terminal locations and voltages before checking

the control. Use the correct terminals for the

corresponding voltage.

A. If correct, temperature control is

functioning properly.

B. If incorrect, check temperature probe as

outlined under TEMPERATURE PROBE

TEST (WKGD/WKGDX).

5. Turn the ON-OFF-OVEN COOL switch to ON.

1) If temperature probe is ok, replace the

temperature control and check

calibration as outlined under SOLID

STATE TEMPERATURE CONTROL

CALIBRATION (WKGD/WKGDX).

TEMPERATURE PROBE TEST

(WKGD/WKGDX)

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

NOTE: The temperature probe used in conjunction

with the Solid State Temperature control is an RTD

(resistance temperature detector) of the Thermistor

type. As temperature increases the resistance value

decreases.

6. Check for proper voltage across terminals 8 & 9

(120VAC) or terminals 8 & 10 (208-240VAC) for

power to the control.

A. If correct, proceed to step 7.

B. If incorrect, problem is not with the

temperature control (See troubleshooting

section).

1. Remove the right side panel as outlined under

COVERS AND PANELS in REMOVAL AND

REPLACEMENT OF PARTS.

7. Check relay voltages on the board:

NOTE: If right side panel is not accessible, this

component can be serviced by removing the control

panel as outlined under COVERS AND PANELS.

A. For 120VAC controls - check across

terminals 7 & 9 for input to the internal

relay and 6 & 9 for output from the internal

relay.

2. Place a shielded thermocouple in the geometric

center of the oven cavity and determine the

temperature in the oven cavity.

B. For 208-240VAC controls - check across

terminals 7 & 10 for input to the internal

relay and 6 & 10 for output from the

internal relay.

3. Remove the probe lead wires from the solid

state temperature control.

4. Test the probe with an ohmmeter.

1) If input voltage to the internal relay is

correct, proceed to step 8. If input

voltage to the internal relay is not

present, problem is not with the

temperature control (See

A. If the measured resistance values are

inside the given tolerance then the probe is

functioning properly.

B. If the measured resistance values are

outside the given tolerance then replace

the probe and retest.

troubleshooting section).

2) If output voltage from the internal

relay is correct proceed to step 8. If

output voltage from the internal relay

is not correct, check temperature

probe as outlined under

1) Check oven for proper operation.

TEMPERATURE PROBE TEST

(WKGD/WKGDX).

8. Set the temperature control to the minimum

setting.

NOTE: Oven temperature must be above 300°F.

9. Check for zero (0) volts AC across terminals 6 &

9 (120VAC) or 6 & 10 (208-240VAC) for no

output from the internal relay.

F32700 (February 2006)

Page 20 of 64

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS

5. Reverse procedure to install.

TEMP (°F)

OHMS*

90000

4077

3016

2266

1726

1332

1041

TEMP (°F)

360

OHMS*

822

240

380

656

260

400

529

280

425

424

300

450

334

320

475

266

340

(*) Resistance in ohms ± 10%

GAS PRESSURE ADJUSTMENT

4. Remove adjustment screw cap from the gas

valve and turn gas supply to the oven back on.

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

5. Plug the unit in and turn the power switch ON.

6. Set the temperature control to its highest setting

and allow burner to ignite.

NOTE: Accurate gas pressure adjustments can only

be made with the gas on and the burner lit.

WARNING: SHUT OFF THE GAS BEFORE

SERVICING THE UNIT.

7. Turn the set screw to obtain the proper gas

pressure (clockwise = pressure increase;

counterclockwise = pressure decrease).

1. Remove the right side panel as outlined under

COVERS AND PANELS in REMOVAL AND

REPLACEMENT OF PARTS.

PRESSURE READINGS (IN W.C.)

NOTE: If right side panel is not accessible, this

component can be serviced by removing the control

panel as outlined under COVERS AND PANELS.

LINE

GAS

TYPE

MANIFOLD

RECOMMENDED MIN MAX

2. Remove the plug from the manifold pressure

port.

Natural

3.5

Propane

NOTE: If the incoming line pressure to the valve is

less than the minimum stated, then the manifold

pressure can not be set correctly.

3. Install hose barb adapter and attach manometer

tube.

Page 21 of 64

F32700 (February 2006)

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS

4. Plug the oven in and set the temperature control

VERIFICATION OF SPARK AT

to the maximum setting.

IGNITOR

5. Turn the power switch ON.

6. Sparking should occur after a 4 second delay,

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

for a duration of 7 seconds then repeat twice

after a 15 second purge time. Arching from the

MACHINE AND FOLLOW LOCKOUT /

ignition cable to the oven frame should be

TAGOUT PROCEDURES.

observed.

DOOR SWITCH ADJUSTMENT

WARNING: SHUT OFF THE GAS BEFORE

SERVICING THE UNIT.

WARNING: DISCONNECT THE

1. Remove the bottom front cover as outlined

under COVERS AND PANELS in REMOVAL

AND REPLACEMENT OF PARTS.

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

2. Disconnect the high voltage IGNITION CABLE

from the spark ignitor.

1. Remove the top front cover as outlined under

COVERS AND PANELS.

2. Door operation:

A. Independent doors - The switch actuator

should be operated by the switch lever

when the right door is between 1" and 1

1/2" from being closed.

B. Simultaneous doors - The switch actuator

should be operated by the switch lever

when the right door is 1/2" from being

closed.

3. If adjustment is necessary, bend the switch

actuator to obtain the proper setting.

WARNING: DO NOT HOLD THE WIRE WITH

YOUR HANDS FOR THIS TEST. THE MANUAL

GAS VALVE MUST BE CLOSED.

3. Clamp the ignition cable in a manner that will

position the end of the cable 3/16" from the

oven frame (bare metal surface).

NOTE: It is critical that the cable be held 3/16" away

from the surface of the oven frame or sparking may

not occur even though the sparking circuit is

functioning properly.

4. Install the top front cover.

5. Apply power to the oven and check for proper

operation.

F32700 (February 2006)

Page 22 of 64

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS

BLOWER ADJUSTMENT

WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AND FOLLOW

LOCKOUT / TAGOUT PROCEDURES.

WARNING: SHUT OFF THE GAS BEFORE SERVICING THE UNIT.

1. Remove the blower motor and mounting assembly by following steps 1 through 8 as outlined under BLOWER

AND MOTOR in REMOVAL AND REPLACEMENT OF PARTS.

2. Loosen the motor mounting bolts.

3. Adjust the motor position until the blower is parallel to and 1/4 inch away from the motor mounting plate.

Check for squareness of the blower to the motor mounting plate at the top, bottom, left and right of the

blower.

A. If the blower is square then tighten motor mounting bolts and proceed to step 4.

B. If the blower is not square continue adjusting until proper spacing is achieved then tighten motor

mounting bolts.

NOTE: If necessary, place shims between motor and frame.

4. Reverse the procedure to install.

Page 23 of 64

F32700 (February 2006)

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS

4. Move the door until proper alignment is

DOOR ADJUSTMENT

achieved then tighten the screws on the upper

door bearing hardware.

WARNING: DISCONNECT THE

5. Repeat step 3 and 4 on the opposite door, if

ELECTRICAL POWER TO THE

necessary.

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

DOOR CATCH BALL

ADJUSTMENT

1. Check the doors to make sure they have an

(INDEPENDENT DOORS)

equal gap between them and that the vertical

edge of the door is parallel to the vertical door

seal. If the doors are not positioned in this

manner, adjust the doors as described.

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

1. Remove top front cover as outline under

COVERS AND PANELS in REMOVAL AND

REPLACEMENT OF PARTS.

2. Open the doors and inspect door strike for

proper shape.

2. Remove the top front cover.

3. Loosen the screws that secure the upper door

bearings and related hardware, just enough to

allow door movement.

A. Replace if bent and adjust as outlined in

this procedure.

3. Open and close the doors several times while

observing the catch ball operation.

A. Replace if malfunctioning and adjust as

outlined in this procedure.

NOTE: Shims may be required under the

door strike, before the proper door tension

adjustment can be set.

F32700 (February 2006)

Page 24 of 64

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS

4. Apply lubricant at the top of the door catch

assembly to lubricate the internal spring. See

LUBRICATION under GENERAL.

5. Close the doors and check them for proper

alignment.

2) Continue adjustment until proper door

operation is achieved.

A. Doors should be centered and parallel at

the top and bottom in the oven cavity

opening as outlined under DOOR

ADJUSTMENT.

DOOR CHAIN ADJUSTMENT

(SIMULTANEOUS DOORS)

6. Open right side door and view the left side catch

ball and door strike position. Ensure catch ball

is resting upon the angular surface of door

strike. Repeat on opposite door.

Introduction

When the oven doors are in proper adjustment, as

the doors come together, the right door will lead the

left door in closing by about 1/4 inch. The doors will

feel like they are self closing the last 1/2 inch of

travel.

NOTE: If catch ball is striking the flat surface on door

strike, shims will be required under the door catch

assembly.

Procedure

NOTE: The catch ball should make contact near the

1. Remove the lower sill cover as outline under

COVERS AND PANELS in REMOVAL AND

REPLACEMENT OF PARTS.

center of door strike.

A. If adjustment is necessary, loosen

mounting screws then slide door strike

from front to back until roller ball rests upon

the angular surface of the door strike.

Tighten screws and check operation.

2. Close doors and check door chain for factory

setting.

A. Turnbuckles should be 5 to 5 1/2 inches

apart.

B. If proper adjustment cannot be achieved,

add shims beneath the door strike. Repeat

step 6. DO NOT BEND THE DOOR

STRIKE.

B. Short eye bolt should be connected to the

end of the chain that goes to the front of

the sprocket.

7. Each oven door should open with a force of 8 to

25 pounds when pulled at the handle. The

adjustment must allow the doors to remain

closed during normal operation and allow

opening without exertion by the user.

C. At the rear of the sprocket, one open link of

the chain should be partially engaged with

a tooth on the sprocket, the next open link

should not be engaged (completely empty),

and the last open link should be secured to

the long eye bolt.

NOTE: The amount of tension on catch ball

determines the opening force of door.

D. Chain must be tight enough that the doors

move simultaneously when opened or

closed.

A. Adjust catch ball tension as follows:

1) Turn set screw inside the catch

assembly housing clockwise to

increase tension on catch ball and

counterclockwise to decrease tension

on catch ball.

E. When the doors are opened, the

turnbuckles will move away from each

other.

Page 25 of 64

F32700 (February 2006)

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS

F. The stop cable must be positioned where it

COMPUTER CONTROL

moves freely and does not get pinched.

(WKGC/WKGCX)

3. Position door chain assembly to factory setting

if the conditions in step 2 are not met.

Operation

Refer to the Owner's Manual for specific operating

instructions.

Setup Mode

NOTE: Use the setup mode to verify that the control

is configured to the factory settings which result in

the proper operation of the oven. If the CAL1

parameter is other than zero, determine if it is still

needed before resetting to zero. See COMPUTER

CONTROL CALIBRATION (WKGC/WKGCX).

CAUTION: Changing the C_F, InP1, rL1 & rH1

parameters will default all menus.

1. Use this key sequence to access the setup

mode.

Up arrow; Rack 1; Temperature; Temperature;

Down arrow; Rack 1

2. Once in the setup mode the display will

alternate between the parameter and

programmed data.

4. If right door does not lead the left door in

•

To change data to the factory setting, use

the arrow keys.

closing:

A. Loosen locknut on both turnbuckles.

B. Loosen left turnbuckle.

C. Tighten right turnbuckle.

D. Tighten locknut on both turnbuckles.

To select the next parameter, press the

Rack 1 key.

After the last Parameter and Data is

viewed, press the Rack 1 key a final time

to exit the setup mode and return to

operations mode. The current set point

temperature will be displayed.

5. If the right door leads the left door by more than

3/8 inch:

A. Loosen locknut on both turnbuckles.

B. Loosen right turnbuckle.

•

After 1 minute of no key activations, the

control will return to operation mode.

C. Tighten left turnbuckle.

3. Listed are the parameters and data you should

find.

D. Tighten locknut on both turnbuckles.

6. Check doors for proper operation.

NOTE: The locknuts must be tight during testing or

the adjustment will not hold.

A. If doors do not close properly, repeat step

4, 5 and 6.

B. If doors operate properly, continue with

procedure.

7. Install the lower front cover.

F32700 (February 2006)

Page 26 of 64

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS

5. Re-assemble oven and check for proper

ALTERNATING ON

operation.

DISPLAY

PARAMETER

DATA

COMPUTER CONTROL

CALIBRATION

Celsius_Fahrenheit

Guard Band

C_F

4000

(WKGC/WKGCX)

Temperature

Compensation

tcnP

OFF

1. Place a thermocouple in the geometric center of

the oven cavity.

Input Type 1

Range Low 1

Range High 1

Hysteresis

InP1

rL1

500

2. Set the ON-OFF-OVEN COOL switch to ON.

A. If the set point temperature is 350°F,

proceed to step 4.

rH1

HYS1

CAL1

B. If the set point temperature is other than

350°F, proceed to step 3 to change the

temperature.

Calibration Offset

set point temperature is

displayed or if call for

heat, dashes (----)

displayed.

Exit Setup Mode and

return to Operation

Mode.

3. Press the set key then temperature key to enter

the temperature set mode.

A. The display will alternate between the term

StPt (set point) and the current oven

temperature setting.

Probe Test

1. Set the control to 350EF.

B. Press the up or down arrow keys to make

the proper selection.

2. Access the back of the control panel to

disconnect the probe lead wires.

C. Press the set key again to save the change

and exit the temperature set mode.

3. Install a jumper wire across the probe terminals.

This will simulate room temperature.

4. Allow the oven temperature to stabilize

(normally 3 cycles).

A. If the heat light comes on and the actual

temperature is room temperature, replace

the probe.

5. Compare the controls set point temperature to

the thermocouple meter reading when the heat

light goes out.

B. If the heat light does not come on or the

actual temperature is not room

A. A temperature variance more than 5°F

indicates an adjustment is needed.

temperature, replace the control.

Solid State Relay Test

1) To make the adjustment, proceed to

step 6.

1. Remove the right side panel as outlined under

COVERS AND PANELS.

2) If temperature variance is less than

5°F, computer control is functioning

properly.

2. Set the temperature to 350°F or high enough to

keep the heat ON for several minutes.

3. Check for +5 VDC on input side of SSR

(terminals 3 & 4).

6. Enter the setup mode as outlined in SETUP

MODE under COMPUTER CONTROL

(WKGC/WKGCX).

A. If +5 VDC is present, continue to step 4.

A. Advance through the menu until CAL1

(Calibration Offset) appears.

B. If no voltage is present, computer control is

not functioning properly.

1) If the thermocouple reading is higher

than set point temperature, press the

down arrow key and enter a negative

offset value that is equal to the

number of degrees above the 5°F

tolerance.

4. Check for 120 VAC at load side of SSR

(terminals 1 & 2).

A. If no voltage is present, solid state relay is

not functioning properly.

1) Replace the SSR and check for

proper operation.

B. If 120 VAC is present, component is

functioning properly.

Page 27 of 64

F32700 (February 2006)

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

2) If the thermocouple reading is lower

than set point temperature, press the

up arrow key and enter a positive

offset value that is equal to the

number of degrees below the 5°F

tolerance.

3) Exit the setup mode.

7. Allow the oven to cycle at least two times

between adjustments.

A. If the temperature variance still differs

more than 5°F from the set point, verify the

correct calibration offset value was entered

and retained.

1) Adjust the calibration offset value as

outlined in step 6, until the cycling

temperature is within tolerance.

B. If the above adjustment cannot be

obtained, replace the computer control and

check for proper operation.

ELECTRICAL OPERATION

COMPONENT FUNCTION

Power Switch (S1) . . . . . . . . . . . . . Determines the mode of operation; ON, OFF, or OVEN COOL.

Oven Light Switch (S2) . . . . . . . . . Controls the oven cavity lights.

Fan Speed Switch Hi/Low (S3) . . . Controls blower motor speed between Hi and Low settings. Available on

standard models WKG/WKGX or WKGD/WKGDX. On models with the

ROAST & HOLD option (S3) becomes the Function Switch.

Function Switch (S3) . . . . . . . . . . . Selects the cooking mode of the oven between Normal ROAST or ROAST

& HOLD and is used in conjunction with the ROAST & HOLD timer during

ROAST & HOLD cooking. The selected mode also determines the fixed

blower speed of Hi for Normal ROAST and Low for ROAST & HOLD. In

ROAST & HOLD mode only, energizes the hold relay (R2). Available on

models with ROAST & HOLD option only. On Standard models (S3)

becomes the Function Switch.

Buzzer . . . . . . . . . . . . . . . . . . . . . . . Signals the end of a Normal ROAST cycle (normal cooking) when time

expires on the Normal ROAST timer.

Normal Roast Timer . . . . . . . . . . . . Counts the ROAST time (normal cooking) of the product and signals the

buzzer at the end of the cycle. On ROAST & HOLD models only, when the

function switch (S3) is set to Normal ROAST, this timer is used.

Roast & Hold Timer . . . . . . . . . . . . When the function switch (S3) is set to ROAST & HOLD, this timer must

used for ROAST & HOLD cooking. When the ROAST (then hold) time

expires and the function switch is set to ROAST & HOLD, this timer is used

to transfer control of the oven temperature to the Hold thermostat. Available

on models with Roast & Hold option only.

Door Switch . . . . . . . . . . . . . . . . . . Allows the oven to operate when the doors are closed but stops the oven

from operating when the doors are opened.

F32700 (February 2006)

Page 28 of 64

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

Blower Motor . . . . . . . . . . . . . . . . . Operates the oven cavity blower (convection fan). Also, an internal

centrifugal switch on the motor is utilized to allow the connection of power

to the heat relay (R3) when the motor is at operating speed.

Motor Speed Relay (R1) . . . . . . . . . Supplies power to the blower motor through (R1) relay contacts. Available

on models with Roast & Hold option only.

Hold Relay (R2) . . . . . . . . . . . . . . . . Hold relay (R2) supplies power to the Hold thermostat for maintaining the

fixed hold temperature in the oven cavity, after the ROAST & HOLD time

expires.

Transformer (T1) . . . . . . . . . . . . . . . Provides 24VAC power to the ignition control module and heating circuit.

Solid State Temperature Control

(WKGD/WKGDX) . . . . . . . . . . . . . . . Monitors temperature sensor and regulates the oven cavity temperature by

controlling the heat relay (R3) through the blower motor centrifugal switch

contacts.

High Limit Thermostat . . . . . . . . . . Protects the oven from temperatures above 550°F by removing power from

the 1^stvalve (safety) on the dual solenoid gas valve which stops the flow of

gas to the burner. Auto resets at 500°F.

Computer Control

(WKGC/WKGCX) . . . . . . . . . . . . . . . Monitors temperature sensor and regulates the oven cavity temperature by

controlling the heat relay (R1) through the blower motor centrifugal switch

contacts. Also, counts the ROAST time (normal cooking) of the product and

signals the electronic alarm at the end of the cycle. If ROAST & HOLD

mode is selected, when the ROAST (then hold) time expires, the oven

heating stops and the oven enters HOLD mode. Once the oven cavity

temperature drops to 150°F, the heat comes back on and the oven cycles

at this temperature to hold the cooked product. Roast & Hold is standard on

computer models.

SSR1 & SSR2 (WKGC/WKGCX) . . When SSR1 is energized by computer control, connects power to blower

motor for Hi fan speed operation in normal ROAST mode. In ROAST &

HOLD Mode only, SSR1 is de-energized and SSR2 is energized by

computer control and connects power to blower motor for Low fan speed

operation.

Ignition Control Module . . . . . . . . . Controls the gas ignition cycle - Energizes the 2^ndvalve (main) on the dual

solenoid gas valve, generates spark for burner ignition, monitors the

presence of a flame and controls the No Ignition light. The ignition times

are: 4 second self diagnostic test (initial power ON); 7 second ignition trial;

3 ignition trials with a 15 second purge between each trial.

Igniter/Flame Sense . . . . . . . . . . . . Ignites the gas and senses the presence of a flame. The flame presence

generates a micro-amp FLAME SENSE current that is monitored by the

ignition control module. A flame sense current of 0.7 micro amp (minimum)

is required to maintain burner ignition.

Power On Light . . . . . . . . . . . . . . . . Lit whenever the power switch (S1) is turned to ON or Oven Cool mode.

Heat Light . . . . . . . . . . . . . . . . . . . . Lit whenever temperature control is calling for heat.

No Ignition Light . . . . . . . . . . . . . . . Lit when power is turned ON, during ignition trial & gas purge time and

when no flame is detected by flame sensor. If the oven fails to ignite after 3

attempts, it will remain lit until power is reset.

Page 29 of 64

F32700 (February 2006)

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

Temperature Probe . . . . . . . . . . . . Senses the oven temperature for the solid state temperature control or the

computer control. On WKGD/WKGDX models, converts the temperature

into a resistance valve which is monitored by the temperature control board.

The probe is an RTD (resistance temperature detector) of the Thermistor

type. As temperature increases the resistance value decreases.

On WKGC/WKGCX models, the probe is a J type thermocouple.

Gas Valve (Dual Solenoid) . . . . . . . Allows gas flow to the burner when the 1^stvalve (safety) and 2^ndvalve

(main) solenoid coils are both energized.

Cooling Fan . . . . . . . . . . . . . . . . . . . Circulates cooler air from rear of oven forward to cool components in the

control area.

Mechanical Temperature Control

KX Thermostat (WKG/WKGX) . . . . Regulates the oven cavity temperature by controlling the heat relay (R3)

through the blower motor centrifugal switch contacts. On ROAST & HOLD

models only, power is first connected through one set of (R4) normally

closed contacts (N.C.) then through the centrifugal switch contacts on the

motor.

Hold Thermostat (KX) . . . . . . . . . . Holds the oven cavity temperature at 160°F after ROAST (then hold) time

expires. For the oven to operate on the Hold thermostat, the ROAST &

HOLD timer must be used and the Function Switch (S3) must be set to.

Available on models with Roast & Hold option only.

COMPONENT LOCATION

F32700 (February 2006)

Page 30 of 64

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

WKG/WKGX - Plug, Socket and Components (Standard Controls)

Page 31 of 64

F32700 (February 2006)

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

WKGD/WKGDX - Plug, Socket and Components (Standard Controls)

F32700 (February 2006)

Page 32 of 64

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

WKG, WKGX/WKGD, WKGDX - Plug, Socket and Components (Roast & Hold Option)

Page 33 of 64

F32700 (February 2006)

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

WKGC/WKGCX - Plug, Socket and Components (Roast & Hold Standard)

F32700 (February 2006)

Page 34 of 64

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

C. Power ON light (Amber) comes ON.

SEQUENCE OF OPERATION

D. Power to one side of the following

components: Normal ROAST timer

terminal 1, ROAST & HOLD timer terminal

1, transformer primary (T1).

WKG, WKGX With Roast & Hold Option

(Mechanical KX Thermostat)

Schematic diagram 10832 will be used to explain the

electrical sequence of operation for both the Normal

ROAST cycle (normal cooking) and the ROAST &

HOLD cycle.

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).

Normal Roast Cycle

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, 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), relay coil

(R4), motor speed (Hi/Low) relay coil

(R1), hold relay coil (R2) and the

component cooling fan.

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 1^stvalve

(safety) on the dual solenoid gas

valve.

a) 1^stvalve (safety) on the gas

valve energized.

B. Oven properly grounded.

C. Gas supply valve ON.

NOTE: Gas does not flow to the

burner until the 2^ndvalve (main)

is energized.

D. Gas combination control valve ON.

E. Power switch (S1) OFF.

2) With door switch closed, power is

connected back 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

F. Function switch (S3) set to Normal ROAST

cycle.

G. Oven light switch (S2) ON/OFF (position

has no affect on the function of the Normal

ROAST cycle).

convection fan motor.

H. Control thermostat dial in the OFF position

(OPEN).

a. Heat light (clear) comes ON.

High limit switch CLOSED.

3) Power is also connected through the

other set of relay R4 normally closed

(N.C.) contacts to the other side of

motor speed relay (R1).

J. Roast timer (normal cooking) in the OFF

position.

K. Roast and Hold timer in the OFF position.

L. Oven doors CLOSED.

a. Motor speed relay (R1)

energized, contacts change state

and the normally open (N.O.) set

of contacts close.

1) Door switch contacts CLOSED.

M. Oven cavity temperature below 140°F.

a) Power is connected through

the function switch (S3)

contacts and the convection

fan motor is energized (fan

speed Hi).

2. Set thermostat to desired Normal ROAST

temperature (normal cooking).

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.

Page 35 of 64

F32700 (February 2006)

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

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

Timer Cycle (Normal Roast Cooking)

NOTE: The ROAST timer (normal cooking) operates

independently of the heating cycle. Additional time

can be set or the timer can be turned OFF

throughout the cooking cycle.

contacts normally open (N.O.)

close and the heating circuit is

powered.

1. With the power switch turned ON, power is

supplied to timer.

a) Ignition control module is

energized.

2. Set ROAST timer to desired time (normal

cooking).

b) No ignition light (red) comes

ON, module performs a self

diagnostic test for 4

A. Contacts 1 & 3 close, timer motor is

energized and timing DOWN begins.

3. Time expires on ROAST timer (normal cooking).

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.

A. Contacts 1 & 3 open, timer motor is de-

energized and timing stops.

B. Contacts 1 & 4 close.

1) Buzzer energized and sounds.

NOTE: The buzzer continues to sound until

the timer dial is set to the OFF position or

additional time is set.

Roast and Hold Cycle

NOTE: Refer to the Owner's Manual for a detailed

If a flame is not SENSED

after 7 seconds of sparking,

the NO IGNITION light

comes back on, 2^ndvalve

(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.

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, oven cavity

lights, buzzer, ROAST timer motor

(normal cooking), ROAST & HOLD

timer motor, heat relay coil (R3),

convection fan motor (C), transformer

primary (T1), relay coil (R4), motor

speed relay coil (R1), hold relay coil

(R2) and the component cooling fan.

4. Oven reaches set temperature and thermostat

opens.

B. Oven properly grounded.

C. Gas supply valve ON.

A. Heat light goes out.

B. Power removed from heat relay (R3).

D. Gas combination control valve ON.

E. Power switch (S1) OFF.

R3 normally open (N.O.) contacts

open.

a. Power removed from 2^ndvalve

(main) on the gas valve and gas

flow to the burner stops.

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).

5. The oven will continue to cycle on the

thermostat until the doors are opened or the

power switch (S1) is turned to the OFF or

OVEN COOL position.

H. Control thermostat in the OFF position

(OPEN).

High limit switch CLOSED.

F32700 (February 2006)

Page 36 of 64

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

J. Roast timer (normal cooking) in the OFF

a. Heat light (clear) comes ON.

position.

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).

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.

a. Motor speed relay (R1)

energized, contacts change state

and the normally open (N.O.) set

of contacts close.

2. Set controlling thermostat to desired ROAST

then Hold temperature (Roast & Hold cooking).

a) Convection fan motor

energized (fan speed low).

NOTE: This is considered first stage cooking in the

ROAST & HOLD cycle.

NOTE: In the ROAST & HOLD

cycle, the fan speed is fixed at

low.

A. Internal contacts close.

3. Power switch (S1) turned ON.

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

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.

contacts normally open (N.O.)

close and the heating circuit is

powered.

D. Power to one side of the following

components: Normal ROAST timer

terminal 1, ROAST & HOLD timer terminal

1, transformer primary (T1).

a) Ignition control module is

energized.

b) No ignition light (red) comes

ON, module performs a self

diagnostic test for 4

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).

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.

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 1^stvalve

(safety) on the dual solenoid gas

valve.

If a flame is not SENSED

after 7 seconds of sparking,

the NO IGNITION light

comes back on, 2^ndvalve

(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.

a) 1^stvalve (safety) on the gas

valve energized.

NOTE: Gas does not flow to the

burner until the 2^ndvalve (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

4. Oven reaches set temperature and controlling

thermostat opens.

A. Heat light goes out.

B. Power removed from heat relay (R3).

convection fan motor.

Page 37 of 64

F32700 (February 2006)

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

R3 normally open (N.O.) contacts

open.

NOTE: When temperature is above

160°F (±12) the hold thermostat

contacts are open.

a. Ignition control module de-

energized.

3) Relay R4 is energized, R4 contacts

change state and both sets of

a) Power removed from 2^nd

valve (main) on the gas

valve and gas flow to the

burner stops.

normally closed (N.C.) contacts

transfer to the normally open (N.O.)

position. Power is not transferred until

the hold thermostat contacts close.

NOTE: This is considered first

stage cooking in the ROAST

AND HOLD cycle.

NOTE: This is considered second stage

cooking in the ROAST AND HOLD cycle

where the stored heat in the oven

continues to cook the product.

5. The oven will continue to cycle on the

controlling thermostat 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.

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

through one set of R4 (N.C.) contacts.

Timer Cycle (Roast & Hold Cooking)

1) Convection fan motor energized (fan

speed low).

NOTE: The ROAST & HOLD timer operates

independently of the heating cycle until time expires.

Regulation of the oven temperature is then

transferred to the Hold thermostat until one of the

following occurs: ROAST & HOLD timer is turned

OFF and the function switch (S3) is turned back to

Normal ROAST (normal cooking) or power switch

(S1) is turned to the OFF or OVEN COOL position.

C. Power is applied to one side of the

centrifugal switch on the convection fan

motor through the other set of R4 (N.C.)

contacts.

D. When the convection fan motor reaches

operating speed, the centrifugal switch on

the motor closes.

1. With the power switch turned ON, power is

supplied to timer.

1) Heat relay (R3) is energized.

a. Heat relay (R3) contacts (N.O.)

close and the heating circuit is

powered.

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) Ignition control module is

energized.

b) No ignition light (red) comes

ON, module performs a self

diagnostic test for 4

A. Contacts 1 & 3 close, timer motor is

energized and timing DOWN begins.

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.

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.

2) Hold relay (R2) is energized, R2

contacts change state and the

If a flame is not SENSED

after 7 seconds of sparking,

the NO IGNITION light

normally open (N.O.) contacts close.

a. Power to one side of hold

thermostat.

comes back on, 2^ndvalve

(main) on the gas valve is

de-energized and gas flow

to the burner stops. Ignition

F32700 (February 2006)

Page 38 of 64

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

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.

E. Power switch (S1) OFF.

F. Function switch (S3) set to Normal ROAST

cycle.

G. Oven light switch (S2) ON/OFF (position

has no affect on the function of the Normal

ROAST cycle).

5. Oven reaches the fixed HOLD temperature and

the hold thermostat opens.

H. Temperature control dial set to lowest

temperature (fully counterclockwise).

A. Heat light goes out.

High limit switch CLOSED.

B. Power removed from heat relay (R3) and

the contacts open (N.O.).

J. Roast timer (normal cooking) in the OFF

position.

1) Ignition control module de-energized.

K. Roast and Hold timer in the OFF position.

L. Oven doors Closed.

a. Power removed from 2^ndvalve

(main) on the gas valve and gas

flow to the burner stops.

1) Door switch contacts CLOSED.

M. Oven cavity temperature below 140°F.

C. Power is also removed from motor speed

relay (R1).

2. Set temperature control dial to desired ROAST

then HOLD temperature (Roast & Hold

cooking).

1) Convection fan motor de-energized

and fan stops rotating.

3. Power switch (S1) turned ON.

6. The oven will continue to cycle on the hold

thermostat until the ROAST & HOLD timer is

turned to the OFF position, the function switch

(S3) is changed back to ROAST (normal

cooking) or the power switch (S1) is turned to

the OFF or OVEN COOL position.

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).

WKGD, WKGDX With Roast & Hold Option (Solid

State Temperature Control)

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).

Schematic diagram 10834 will be used to explain the

electrical sequence of operation for both the Normal

ROAST cycle (normal cooking) and the ROAST &

HOLD cycle.

Normal Roast Cycle

1. Conditions.

A. Oven connected to correct voltage.

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

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 1^stvalve

(safety) on the dual solenoid gas

valve.

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.

a) 1^stvalve (safety) on the gas

valve energized.

NOTE: Gas does not flow to the

burner until the 2^ndvalve (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).

B. Oven properly grounded.

C. Gas supply valve ON.

D. Gas combination control valve ON.

Page 39 of 64

F32700 (February 2006)

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

a. Motor speed relay (R1) is

energized through hold relay

(R2) normally closed contacts

(N.C.). Relay contacts (R1)

If a flame is not SENSED

after 7 seconds of sparking,

the NO IGNITION light

comes back on, 2^ndvalve

(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.

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 hi).

b) When the convection fan

motor reaches operating

speed, the centrifugal switch

(N.O.) on the motor closes.

4. Oven reaches set temperature.

A. Temperature control de-energizes internal

relay and the normally open (N.O.)

contacts OPEN.

c) Power to normally open

(N.O.) side of internal relay

contacts (terminal 7) on the

temperature control board.

1) Heat light goes out.

3) Power is also connected back through

a second set of contacts on the power

switch (S1) to terminal 8 on the

2) Power removed from heat relay (R3).

R3 normally open (N.O.)

contacts OPEN.

temperature control board.

a) Power removed from 2^nd

valve (main) on the gas

valve and gas flow to the

burner stops.

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:

5. The oven will continue to cycle on the

temperature control until the doors are opened

or power switch (S1) is turned to the OFF or

OVEN COOL position.

a) Heat light (clear) comes ON.

Timer Cycle (Normal Roast Cooking)

b) Power is connected through

the centrifugal switch

NOTE: The ROAST timer (normal cooking) operates

independently of the heating cycle. Additional time

can be set or the timer can be turned OFF

throughout the cooking cycle.

contacts on the convection

fan motor, heat relay (R3) is

energized, (R3) contacts

(N.O.) close and the heating

circuit is powered.

1. With the power switch turned ON, power is

supplied to timer.

A. Set ROAST timer to desired time (normal

cooking).

c) Ignition control module is

energized.

B. Contacts 1 & 3 close, timer motor is

energized and timing DOWN begins.

d) No ignition light (red) comes

ON, module performs a self

diagnostic test for 4

2. Time expires on ROAST timer (normal cooking).

seconds, 2nd valve (main)

on the gas valve is

energized. Gas starts to flow

to the burner, sparking

A. Contacts 1 & 3 open, timer motor is de-

energized and timing stops.

B. Contacts 1 & 4 close.

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.

1) Buzzer energized and sounds.

NOTE: The buzzer continues to sound until

the timer dial is set to the OFF position or

additional time is set.

F32700 (February 2006)

Page 40 of 64

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

Roast and Hold Cycle

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).

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).

1) Transformer (T1) energized.

2) L2 (NEUTRAL or SECOND LINE) to

one side of the following components:

power ON light, heat light,

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 1^stvalve

(safety) on the dual solenoid gas

valve.

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.

a) 1^stvalve (safety) on the gas

valve energized.

NOTE: Gas does not flow to the

burner until the 2^ndvalve (main)

is energized.

B. Oven properly grounded.

C. Gas supply valve ON.

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).

D. Gas combination control valve ON.

E. Power switch (S1) OFF.

F. Function switch (S3) set to ROAST &

HOLD cycle.

a. Motor speed relay (R1) is

energized through hold relay

(R2) normally closed contacts

(N.C.). Relay contacts (R1)

G. Oven light switch (S2) ON/OFF (position

has no affect on the function of the ROAST

& HOLD cycle).

change state and the normally

open (N.O.) set of contacts close.

H. Temperature control dial set to lowest

temperature (fully counterclockwise).

a) Power is connected through

the function switch (S3)

contacts and convection fan

motor is energized (fan

speed low).

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.

NOTE: In the ROAST & HOLD

cycle, the fan speed is fixed at

low.

1) Door switch contacts CLOSED.

M. Oven cavity temperature below 140°F.

b) When the convection fan

motor reaches operating

2. Set temperature control dial to desired ROAST

then Hold temperature (Roast & Hold cooking).

speed, the centrifugal switch

(N.O.) on the motor closes.

3. Power switch (S1) turned ON.

c) Power to normally open

(N.O.) side of internal relay

contacts (terminal 7) on the

temperature control board.

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).

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)

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

a. Solid state temperature control

energized. If the oven

a) Power removed from 2^nd

valve (main) on the gas

valve and gas flow to the

burner stops.

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:

NOTE: This is considered first

stage cooking in the ROAST &

HOLD cycle.

5. The oven will continue to cycle on the

a) Heat light (clear) comes ON.

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.

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.

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.

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.

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.

If a flame is not SENSED

after 7 seconds of sparking,

the NO IGNITION light

comes back on, 2^ndvalve

(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.

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.

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 is connected through function

switch (S3) --- Hold relay (R2) is then

energized, R2 contacts change state

and the normally open (N.O.) contacts

close.

2) Power removed from heat relay (R3).

R3 normally open (N.O.)

contacts OPEN.

F32700 (February 2006)

Page 42 of 64

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

a. Power to one side of hold

thermostat.

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, 2^ndvalve

(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.

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.

5. Oven reaches the FIXED hold temperature and

hold thermostat opens.

NOTE: This is considered

second stage cooking in the

ROAST & HOLD cycle where the

stored heat in the oven continues

to cook the product.

A. Heat light goes out.

B. Power removed from heat relay (R3) and

the contacts open (N.O.).

4. Oven temperature falls below 160°F (±12) and

hold thermostat contacts close.

1) Ignition control module de-energized.

a. Power removed from 2^ndvalve

(main) on the gas valve and gas

flow to the burner stops.

A. Heat light comes ON.

B. Motor speed relay (R1) is energized, (R1)

contacts change state and the normally

open (N.O.) contacts CLOSE.

C. Power is also removed from motor speed

relay (R1).

1) Convection fan motor energized (fan

speed low).

1) Convection fan motor de-energized

and fan stops rotating.

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.

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.

D. When the convection fan motor reaches

operating speed, the centrifugal switch on

the motor closes.

Oven Cool Cycle (Solid State Temperature

Control)

1) Heat relay (R3) is energized.

a. Heat relay (R3) contacts (N.O.)

close and the heating circuit is

powered.

NOTE: The electrical sequence of operation for the

OVEN COOL cycle is written for ovens with the

ROAST & HOLD option.

a) Ignition module is

energized.

1. Conditions.

A. Oven is ON.

b) No ignition light (red) comes

ON, module performs a self

diagnostic test for 4

B. Oven cavity temperature needs to be

lowered.

seconds, 2nd valve (main)

on the gas valve is

energized. Gas starts to flow

to the burner, sparking

C. Doors are open.

1) Door switch contacts OPEN.

D. Roast and Hold timer in the OFF position.

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

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)

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

2. Power Switch (S1) turned to OVEN COOL.

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 1^stvalve

(safety) on the dual solenoid gas

valve.

NOTE: With door switch contacts OPEN (doors

open), the convection fan motor will still run and

continue to cool the oven. However, power would be

removed from the following components: Power ON

light (goes out), Normal ROAST timer, ROAST &

HOLD timer, transformer T1 (de-energized) and to

the component cooling fan.

a) 1^stvalve (safety) on the gas

valve energized.

A. Power to motor speed (Hi/Low) relay (R1)

normally open (N.O.) contacts and to

common (C) on hold relay (R2). Power is

then connected through hold relay (R2)

normally closed (N.C.) contacts to motor

speed (Hi/Low) relay (R1) coil.

NOTE: Gas does not flow to the

burner until the 2^ndvalve (main)

is energized.

3) Component cooling fan.

1) Motor speed (Hi/Low) relay (R1) is

energized and contacts change state.

4. The oven will remain in this condition until the

power switch (S1) is turned to the OFF or ON

position.

a. Power is connected through

motor speed (Hi/Low) relay

normally open (N.O.) contacts,

through function switch (S3) to

Convection fan motor.

WKGC, WKGCX

(Roast & Hold Standard on Computer Model)

Schematic diagram 10835 will be used to explain the

electrical sequence of operation for both the ROAST

cycle (normal cooking) and the ROAST & HOLD

cycle.

a) Convection fan motor

energized.

NOTE: If function switch (S3) is

set to Normal ROAST cycle, fan

speed will be high; if set to

ROAST & HOLD cycle, fan

speed will be low.

Roast Cycle (Normal Cooking)

1. Conditions.

A. Oven connected to correct voltage.

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

b) When Convection fan motor

reaches operating speed the

centrifugal switch on the

motor closes but no power

is available for connection to

other components.

2) L2 (NEUTRAL or SECOND LINE) to

one side of the following components:

oven cavity lights, convection fan

motor common (C), transformer

primary (T1), component cooling fan

and the heat relay coil (R1).

B. Power to one side of the hold thermostat

contacts but is not transferred to other

components due to oven cavity

temperature above 160°F (thermostat

OPEN).

B. Oven properly grounded.

1) Ground (GND) to one side of the

following components: computer

control case, NO IGNITION light,

transformer secondary (T1), ignition

control module, the 1^stvalve (safety)

and 2^ndvalve (main) on the dual

solenoid gas valve and computer

control pin 9 (C3-9).

C. Power to terminal 7 on the solid state

temperature control but is not transferred

to other components due to temperature

control not being powered.

3. If door switch is CLOSED (doors closed), power

is supplied to one side of the following

components: Power ON light (Amber), oven

light switch (S2), Normal ROAST timer terminal

1, ROAST & HOLD timer terminal 1,

transformer primary (T1) and component

cooling fan.

C. Gas supply valve ON.

D. Gas combination control valve ON.

E. Power switch (S1) OFF.

F. Computer control is setup properly and

ready to use.

1) Power ON light (Amber) comes ON.

2) Transformer (T1) energized.

G. Oven light switch (S2) ON/OFF (position

has no affect on the function of the ROAST

cycle).

H. High limit switch CLOSED.

F32700 (February 2006)

Page 44 of 64

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

Oven doors Closed.

NOTE: Power is not applied

to the heat relay coil (R1)

until the centrifugal switch

contacts on the convection

fan motor close.

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).

c. The controls 5VDC output from

pins C2-2 (-) and C2-8 (+) is

activated and SSR1 relay is

energized.

NOTE: Power at pin 3 is not transferred to

other components until computer control is

energized and operating conditions are

met.

a) Convection fan motor is

energized (fan speed hi).

B. Power is available to the oven light switch

(S2).

b) When the convection fan

motor reaches operating

C. Power to terminal 1 on solid state relay 1

(SSR1 -load side) and solid state relay 2

(SSR2 -load side).

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).

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

1^stvalve (safety) on the dual solenoid

gas valve.

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.

a. 1^stvalve (safety) on the gas valve

energized.

c. Ignition control module is

energized.

NOTE: Gas does not flow to the

burner until the 2^ndvalve (main)

is energized.

a) No ignition light (red) comes

ON, module performs a self

diagnostic test for 4

2) Power (24VAC) to the oven computer

control.

seconds, 2nd valve (main)

on the gas valve is

energized. Gas starts to flow

to the burner, sparking

a. Control is energized and

performs a power ON self test

before energizing outputs.

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.

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.

If a flame is not SENSED

after 7 seconds of sparking,

the NO IGNITION light

comes back on, 2^ndvalve

(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.

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.

Page 45 of 64

F32700 (February 2006)

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

3. Oven reaches set point temperature.

3. At the end of the ROAST time, the electronic

beeper sounds momentarily to indicate the end

of first stage cooking (oven operates normally at

the temperature and time selected until time

expires).

A. Computer control de-activates the 120VAC

output to heat relay (R1).

1) Heat relay (R1) de-energized and the

normally open (N.O.) contacts OPEN.

4. The display flashes HOLD as the oven enters

HOLD mode. This is also considered second

stage cooking (oven heating stops but product

continues to cook on residual heat).

a. Power removed from ignition

control module.

a) The 2^ndvalve (main) on the

gas valve is de-energized

and gas flow to the burner

stops.

A. Convection fan motor is de-energized.

5. After the oven temperature drops below 150°F,

the heat comes back ON and cycles as needed,

to maintain the HOLD temperature of 150°F.

B. Oven HEAT LIGHT on the control goes

out.

A. Convection fan motor energized.

C. Oven READY LIGHT on the control comes

ON.

6. The oven continues to cycle in this manner until

one of the following occurs:

D. Electronic beeper sounds momentarily.

A. The ROAST & HOLD mode is turned OFF.

4. The oven will continue to cycle on the computer

control until the doors are opened or power

switch (S1) is turned to the OFF or OVEN

COOL position.

B. Power switch (S1) is turned to the OFF or

OVEN COOL position.

Oven Cool Cycle (Computer Control Model)

1. Conditions.

Temperature and Time Cycle (Cooking)

A. Oven is ON.

NOTE: The computers internal COOK timer operates

independently of the heating cycle. Additional time

can be set or the timer can be stopped and re-

started throughout the cooking cycle.

B. Oven cavity temperature needs to be

lowered.

C. Doors are open.

Refer to the Owners's Manual for specific operating

instructions of the oven Computer Control.

1) Door switch contacts OPEN.

D. Power switch (S1) set to either ON or OFF.

2. Power Switch (S1) turned to OVEN COOL.

Roast and Hold Cycle

NOTE: For a detailed explanation of the ROAST &

HOLD mode, refer to the Instructions Manual as

outlined under SETTING THE OVEN FOR ROAST &

HOLD and ROAST & HOLD OPERATION.

NOTE: With door switch contacts OPEN (doors

open), the convection fan motor will still run and

continue to cool the oven.

In ROAST & HOLD mode, the operation of the

computer control is identical to the normal Cook

Cycle with these exceptions:

A. Power is connected through power switch

(S1) to the convection fan motor high

speed terminal.

1. Oven ROAST & HOLD light on the control

comes ON.

1) Convection fan motor energized.

2) When Convection fan motor reaches

operating speed the centrifugal switch

on the motor closes but no power is

available for connection to other

components.

2. Convection fan speed changes from High to

Low.

A. The computer control 5VDC output from

pins C2-2 (-) and C2-8 (+) is de-activated

and SSR1 relay is de-energized.

3) The oven will continue to operate in

OVEN COOL mode until the power

switch (S1) is turned to the OFF or

ON position.

1) Power (120VAC) is removed from

convection fan motor high speed

terminal.

B. The computer control 5VDC output from

pins C2-1 (-) and C2-8 (+) is activated and

SSR2 relay is energized.

1) Power (120VAC) is applied to the

convection fan motor low speed

terminal.

F32700 (February 2006)

Page 46 of 64

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

SCHEMATICS

WKG, WKGX Mechanical (KX) Controls

Page 47 of 64

F32700 (February 2006)

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

WKG, WKGX Mechanical (KX) Controls, Roast & Hold Option

F32700 (February 2006)

Page 48 of 64

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

WKGD, WKGDX Solid State Temperature Control

Page 49 of 64

F32700 (February 2006)

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

WKGD, WKGDX Solid State Temperature Control, Roast & Hold Option

F32700 (February 2006)

Page 50 of 64

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

WKGC, WKGCX Computer Control (Roast & Hold Standard)

Page 51 of 64

F32700 (February 2006)

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

WIRING DIAGRAMS

WKG, WKGX Mechanical (KX) Controls

F32700 (February 2006)

Page 52 of 64

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

Page 53 of 64

F32700 (February 2006)

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

WKG, WKGX Mechanical (KX) Controls, Roast & Hold Option

F32700 (February 2006)

Page 54 of 64

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

Page 55 of 64

F32700 (February 2006)

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

WKGD, WKGDX Solid State Temperature Control

F32700 (February 2006)

Page 56 of 64

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

Page 57 of 64

F32700 (February 2006)

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

WKGD, WKGDX Solid State Temperature Control, Roast & Hold Option

F32700 (February 2006)

Page 58 of 64

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

Page 59 of 64

F32700 (February 2006)

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

WKGC, WKGCX Computer Control (Roast & Hold Standard)

F32700 (February 2006)

Page 60 of 64

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

Page 61 of 64

F32700 (February 2006)

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - TROUBLESHOOTING

TROUBLESHOOTING

WARNING: CERTAIN PROCEDURES IN THIS SECTION REQUIRE ELECTRICAL TEST OR MEASUREMENTS

WHILE POWER IS APPLIED TO THE MACHINE. EXERCISE EXTREME CAUTION AT ALL TIMES. IF TEST

POINTS ARE NOT EASILY ACCESSIBLE, DISCONNECT POWER AND FOLLOW LOCKOUT/TAGOUT

PROCEDURES, ATTACH TEST EQUIPMENT AND REAPPLY POWER TO TEST.

ALL MODELS

SYMPTOMS

POSSIBLE CAUSES

Blower motor doesn’t run with 1S in OVEN COOL

position.

1. Line voltage.

2. Power switch (S1) malfunction.

3. Switch (S3) malfunction.

4. Interconnecting wiring malfunction.

5. Motor inoperable.

Blower motor doesn’t run in ON position. OVEN

COOL functions OK.

1. Door switch malfunction.

2. Power switch contacts inoperative.

3. Interconnecting wiring malfunction.

Blower motor doesn’t run in OVEN COOL position.

Runs OK in ON position.

1. Power switch malfunction.

2. Interconnecting wiring malfunction.

Gas does not ignite; No spark; No Ignition Light ON.

1. Shorted electrode on ignitor/flame sense.

2. Ignitor cable (high voltage) OPEN.

3. Heat relay (R3) malfunction.

4. Transformer (T1) inoperative.

5. High limit thermostat open.

6. Interconnecting wiring malfunction.

7. Ignition Module malfunction.

Sparks but gas does not ignite.

1. Gas solenoid valve OFF or inoperative.

2. Manual gas valve CLOSED.

3. Gas supply OFF or Insufficient gas pressure.

4. Interconnecting wiring malfunction.

5. Ignition Module malfunction.

Gas ignites but will not maintain flame.

1. Igniter lead connections malfunction.

2. Ignitor ground inoperative.

3. Ignitor/flame sense malfunction.

4. Insufficient gas pressure.

5. Snorkel vent plugged, obstructed or missing.

6. Incorrect polarity from transformer (T1) to Ignition

module.

Excessive or low heat.

1. Temperature probe malfunction on models

WKGD, WKGDX. (Thermostat malfunction on

models WKG, WKGX)

2. Temperature control board malfunction.

3. Gas pressure Insufficient.

4. Gas orifice plugged or obstructed.

Mechanical Timer inoperative or not functioning

properly.

1. Interconnecting wiring malfunction.

2. Line voltage incorrect.

3. Timer malfunction.

F32700 (February 2006)

Page 62 of 64

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - TROUBLESHOOTING

SYMPTOMS

POSSIBLE CAUSES

Normal (Roast) mode OK, no Hold mode.

(Roast & Hold models only).

1. Roast and Hold switch (S3) malfunction.

2. R2 hold relay malfunction.

3. Roast & Hold timer malfunction.

4. Interconnecting wiring malfunction.

Component cooling Fan does not run.

Uneven Cooking.

1. Motor inoperable.

2. Interconnecting wiring malfunction.

1. Convection Fan motor speed/direction.

2. Poor combustion.

A. Gas pressure incorrect.

B. Exhaust vent plugged or obstructed.

C. Snorkel Vent plugged or obstructed.

3. Air flow Baffles missing or damaged.

Intermittent problems.

1. High ambient temperatures.

2. Wiring connections loose.

3. Cooling fan malfunction.

No power to temperature control.

1. Power switch (S1) in OVEN COOL.

2. Door or door switch open.

COMPUTER CONTROL MODELS ONLY

SYMPTOM

POSSIBLE CAUSES

Oven does not heat.

1. High limit switch open.

2. Probe malfunction.

3. Control malfunction.

High limit thermostat shutting off gas

burner.

1. Probe malfunction.

2. Control malfunction.

Oven not hot enough.

1. Probe malfunction.

2. Control range high (rH1) setting to low. See SETUP MODE

under COMPUTER CONTROL (WKGC, WKGCX).

3. Control malfunction.

Error Codes

In the display window, the error code will alternate between the code and the oven cavity temperature or dashes if

the oven is calling for heat (heat light on). When the condition causing the error is resolved, normal oven operation

can resume.

NOTE: To check a SETUP PARAMETER and its corresponding DATA VALUE, see SETUP MODE under

COMPUTER CONTROL (WKGC/WKGCX).

NOTE: If the cause of the error is not apparent, check for these conditions as they may also cause errors to occur:

Electrical noise or a noise event, excess environmental moisture or temperature, or vibration.

CODE & PROBLEM

Er01 - ROM checksum error

Er02 - RAM checksum error

Er03 - Ambient sensor error

PROBABLE CAUSE

Internal ROM malfunction

SOLUTION

Cycle power

Internal RAM malfunction

Ambient temperature is below 32EF

Check ambient temperature at the

control.

Er04 - Configuration error

Er05 - EEprom error

Microprocessor malfunction

Power loss while storing data

Cycle power

Page 63 of 64

F32700 (February 2006)

Download from Www.Somanuals.com. All Manuals Search And Download.

FULL SIZE GAS CONVECTION OVENS - CONDENSED SPARE PARTS LIST

CODE & PROBLEM PROBABLE CAUSE SOLUTION

• Incorrect sensor type

Er06 - Zone 1 A/D underflow

error

• Check the InP1 setup parameter.

Verify it matches your sensor.

• Measuring temperature outside the

sensor range

• Check sensor and connections for a

reversed or open sensor. If the

condition causing the error is

resolved, the error will clear.

Er07 - Zone 1 A/D overflow

error

Open sensor

• Check the InP1 setup parameter.

Verify it matches your sensor.

• Check sensor and connections for a

reversed or open sensor. If the

condition causing the error is

resolved, the error will clear.

Er10 - Stack overflow error

Er11 - Open sensor error

Microprocessor malfunction

Open sensor

• Cycle power.

• Check sensor and connections for a

reversed or open sensor.

• Check the InP1 setup parameter.

Verify it matches your sensor.

• Check sensor and connections for a

reversed or open sensor.

Er12 - Shorted sensor

• Incorrect sensor type

• Check the InP1 setup parameter.

Verify it matches your sensor.

• Measuring temperature outside the

sensor range

• Check sensor and connections for a

reversed or open sensor.

CONDENSED SPARE PARTS LIST

WKG SERIES

Part No.

340324-8

411506-3

353613-2

353589-1

411496-F1

497269-1

497269-2

427137-2

416535-6

346357-1

424194-1

411690-1

340324-9

358516-1

424846-1

920883-3

821875-2

421758-G1

Description

Main Power Switch (On/Off/Oven Cool)

Thermostat, KX (WKG, WKGX)

Temperature Control Board (WKGD, WKGDX)

Temperature Probe (WKGD, WKGDX)

Door Switch

Gas Valve, Natural

Gas Valve, Propane

Ignition Module

Heat Relay

High Limit Thermostat

Igniter/Flame Sensor

Timer - 60 Minute

Light Switch, Roast & Hold or Fan Speed

Blower Motor, 2Sp. 120 Volt

Computer Control (WKGC, WKGCX)

Temperature Probe (WKGC, WKGCX)

SST Relay (WKGD, WKGDX)

Transformer

F32700 (February 2006)

Printed in U.S.A.

Download from Www.Somanuals.com. All Manuals Search And Download.

Weed Eater Trimmer 530086922 User Manual
Wells Gardner Computer Monitor D9410 Series User Manual
Whirlpool Refrigerator WRX735SDBM User Manual
Whistler Radar Detector 1660 User Manual
Windmere Iron I 210 User Manual
Wolf Oven SO30 2U S User Manual
Woods Equipment Compact Loader 111877 User Manual
Wow Wee Baby Toy 4055 User Manual
Wyse Technology Webcam 060413 User Manual
Zanussi Plumbing Product 132642 User Manual