Wolf WKGD 126621, WKG 126620, WKGDX 126624, WKGCX 126625, WKGC 126622 User Manual

...
4 (1)

SERVICE MANUAL

WKG SERIES

FULL SIZE

GAS CONVECTION OVENS

MODEL ML

WKG 126620

WKGD 126621

WKGC 126622

WKGX 126623

WKGDX 126624

WKGCX 126625

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 you have the necessary tools, instruments and skills required to perform 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)

FULL SIZE GAS CONVECTION OVENS

 

TABLE OF CONTENTS

 

GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. 4

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4

Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4

Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4

Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4

REMOVAL AND REPLACEMENT OF PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5

Covers and Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5

Control Panel Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6

Component Panel Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7

Temperature Probe (WKGD/WKGDX) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8

Gas Burner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8

Gas Orifice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9

Gas Solenoid Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9

Ignition Control Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10

Spark Igniter and Flame Sense . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10

Blower and Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

11

Oven Doors and Bearings (Independent Doors) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

12

Oven Doors (Simultaneous Doors) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

13

Door Catch Ball Assembly (Independent Doors) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

14

Door Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

14

Door Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

15

Mechanical Kx Thermostat (WKG/WKGX) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

16

High Limit Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

16

Interior Lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

16

Cooling Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

17

SERVICE PROCEDURES AND ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

18

Solid State Temperature Control Calibration (WKGD/WKGDX) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

18

Mechanical Thermostat Calibration (WKG/WKGX) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

19

Solid State Temperature Control Test (WKGD/WKGDX) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

19

Temperature Probe Test (WKGD/WKGDX) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

20

Gas Pressure Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

21

Verification of Spark at Ignitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

22

Door Switch Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

22

Blower Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

23

Door Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

24

Door Catch Ball Adjustment (Independent Doors) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

24

Door Chain Adjustment (Simultaneous Doors) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

25

F32700 (February 2006)

 

Page 2 of 64

 

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

© Wolf Range 2006

 

Page 3 of 64

 

F32700 (February 2006)

 

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

 

 

 

 

 

 

 

 

 

 

MODEL

CAVITY

TEMPERATURE

DOORS

NORMAL

NORMAL

ROAST

 

 

TIMER OR

 

BLOWER

 

DEPTH

CONTROL

(50/50)

(ROAST)

HOLD

&

 

208/240/60/1

 

TIMER

HOLD

 

 

 

 

 

TIMER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

WKG

26.5"

Mechanical (KX)

Independent 1, 2

1-Hour Dial

5-Hour Dial

Optional

 

Optional

WKGX

30.5"

Mechanical (KX)

Independent 1, 2

1-Hour Dial

5-Hour Dial

Optional

 

Optional

WKGD

26.5"

Solid State

Independent 1, 3

1-Hour Dial

5-Hour Dial

Optional

 

Optional

WKGDX

30.5"

Solid State

Independent 1, 3

1-Hour Dial

5-Hour Dial

Optional

 

Optional

WKGC

26.5"

Computer

Independent 1, 3

24-Hour

Built in

Built in

 

Optional

 

 

 

 

Digital

 

 

 

 

WKGCX

30.5"

Computer

Independent 1, 3

24-Hour

Built in

Built in

 

Optional

 

 

 

 

Digital

 

 

 

 

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).

INSTALLATION

Refer to the Owner's Manual for detailed installation instructions on single or stacked ovens.

OPERATION

Input BTU Rating

 

Natural Gas

- 44,000

BTU input at 3.5 in. W.C.

Propane Gas

- 44,000

BTU input at 10.0 in. W.C.

Gas Line Pressures

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

Refer to the Owner's Manual for specific operating instructions.

Propane - Recommend (in. W.C.) 11.0, Min 11.0 Maximum 14.0 in. W.C. (Nat. or Prop.)

CLEANING

Refer to the Owner's Manual for specific cleaning instructions.

LUBRICATION

!Cavity blower motor has sealed bearings and requires no additional lubrication.

!Huskey’s TF1000 grease or equivalent high temperature Teflon grease.

SPECIFICATIONS

Electrical

Voltage

-

120/60/1

Amps

-

9.0 Amps

TOOLS

Standard

!Standard set of hand tools.

!VOM with A.C. current tester (Any quality VOM with a sensitivity of at least 20,000 ohms per volt can be used).

!Gear Puller to remove blower

Special

!Temperature tester (thermocouple type).

!Manometer

F32700 (February 2006)

 

Page 4 of 64

 

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.

2. Reverse the procedure to install.

Bottom Front Cover

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.

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.Remove the remaining six screws securing the right side panel.

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)

 

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

 

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)

 

FULL SIZE GAS CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS

TEMPERATURE PROBE (WKGD/WKGDX)

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 probe leads from the temperature control.

3.Remove the racks and right rack support.

4.Remove probe clips from probe.

5.Push the probe through the opening in cavity side 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.

6.Reverse the procedure to install the replacement probe.

7.Adjust the temperature control as outlined under SOLID STATE TEMPERATURE CONTROL CALIBRATION (WKGD/WKGDX) in SERVICE PROCEDURES AND ADJUSTMENTS.

GAS BURNER

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 lower front cover as outlined under COVERS AND PANELS.

2.Disconnect the ignition cable and the flame sense lead wire.

3.Remove the bolts securing the gas manifold and place manifold aside.

4.Remove the screws securing the burner cover then lift out.

5.Grasp the burner and lift out.

F32700 (February 2006)

 

Page 8 of 64

 

FULL SIZE GAS CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS

6.Reverse procedure to install the replacement burner.

NOTE: Ensure that burner positioning bracket (U shaped end) is inserted into slot at the rear of the burner chamber.

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.

1.Remove the bottom front cover as outlined under COVERS AND PANELS.

2.Remove the bolts securing the gas manifold to the oven and place the manifold to the side.

4.Reverse procedure to install and check for proper operation.

GAS SOLENOID VALVE

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.

1.Remove the control panel and 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 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)

 

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.

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

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 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.Loosen the screws securing the mounting bracket to the component panel and remove the bracket.

3.Disconnect the lead wires and igniter cable from the ignition module board.

4.Remove the ignition module board from the mounting bracket.

5.Reverse the procedure to install the replacement ignition module board.

SPARK IGNITER AND

FLAME SENSE

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 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)

 

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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.

1.Take out the racks and rack supports.

2.Remove screws securing the SNORKEL and remove the snorkel.

4.If replacing:

A.Blower Only - Loosen set screws on blower hub and using a bearing puller, remove blower from motor shaft.

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.

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FULL SIZE GAS CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS

6.Remove the nuts that secure the motor mounting plate to the rear wall.

7.Place a piece of cardboard on the bottom of the oven cavity to protect its surface from any damage during motor assembly removal.

8.Pull the motor assembly into the oven cavity and 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.

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.

NOTE: Check data plate on motor for wiring schematic. The motor must rotate clockwise when viewed from the shaft end.

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 (INDEPENDENT DOORS)

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

1.Remove the top front cover and bottom front cover as outlined under COVERS AND PANELS.

F32700 (February 2006)

 

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Wolf WKGD 126621, WKG 126620, WKGDX 126624, WKGCX 126625, WKGC 126622 User Manual

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.

4.Remove the two (2) lower sill bolts by the lower door shaft and the four (4) counter-sunk screws from the lower sill.

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.

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.

C.If replacing the bottom bearing, remove it from the door shaft or the lower sill opening.

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

1.Remove the top front cover and bottom front cover as outlined under COVERS AND PANELS.

2.Remove the door switch lever.

3.Remove the top bearing retainers and top bearings.

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.

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FULL SIZE GAS CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS

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.

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.

7.Reverse procedure to install door assembly and check for proper adjustment as outlined under DOOR ADJUSTMENT, DOOR CHAIN 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.

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.

DOOR CATCH BALL ASSEMBLY (INDEPENDENT DOORS)

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

1.Remove the top front cover as outlined under COVERS AND PANELS.

2.Remove the screws that secure the door catch assembly.

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.

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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.

3. Simultaneous doors:

5.Reverse procedure to install the replacement window.

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.

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.

4.Remove the screws securing the window TABS to the door bracket and lift the window assembly out from the door frame.

DOOR SWITCH

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

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.Reverse procedure to install the replacement switch and check for proper adjustment as outlined under DOOR SWITCH ADJUSTMENT in SERVICE PROCEDURES AND ADJUSTMENTS.

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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 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.

1.Take out racks from the oven.

2.Remove the high limit thermostat cover/mounting plate from inside the oven cavity at the top.

3.Disconnect lead wires from high limit thermostat then remove high limit thermostat from cover/mounting plate.

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

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.

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FULL SIZE GAS CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS

Lamp Assembly

WARNING: DISCONNECT THE

ELECTRICAL POWER TO THE

MACHINE AND FOLLOW LOCKOUT /

TAGOUT PROCEDURES.

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.

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.

7.Install the light bulb and lens.

8.Check for proper operation.

COOLING FAN

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 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.

4.Reverse the procedure to install the replacement fan and check for proper operation.

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.

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.

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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.

SOLID STATE TEMPERATURE CONTROL CALIBRATION (WKGD/WKGDX)

1.Place a thermocouple in the geometric center of the oven cavity.

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

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

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.

6.Calculate the differential by subtracting the temperature indicated when the lamp goes out from the temperature indicated when the lamp comes on.

A.The differential calculated should be less than 20 °F.

1)If the differential is less than 20 °F, the temperature control circuit is functioning properly.

a.Proceed to step 7.

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

a.Check the temperature probe as outlined under TEMPERATURE PROBE TEST (WKGD/WKGDX).

b.If the probe is functioning properly then temperature control is malfunctioning.

a)Install a replacement temperature control and check calibration.

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.

A.If the average temperature is less than 10 °F from the dial setting, the thermostat is properly calibrated.

B.If the average temperature is more than 10 °F from the dial setting, the thermostat calibration must be adjusted.

1)Loosen the temperature control knob set screw and remove the knob from the stem.

2)Loosen temperature control mounting screws only enough to rotate the control.

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 counterclockwise to decrease.

b.Center the stem in the opening and re-tighten the temperature control mounting screws.

c.Replace knob and re-tighten set screw .

d.Rotate the knob to the lowest temperature setting then back to 350°F.

e.Repeat the average temperature calculation in step 7.

NOTE: Allow the oven to cycle at least two times between adjustments before performing the calculation.

a)If the average temperature still differs more than 10 °F from the dial setting, adjust the thermostat calibration until the average temperature is within tolerance.

C.If the above adjustment cannot be obtained, replace the temperature control and check calibration.

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FULL SIZE GAS CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS

MECHANICAL THERMOSTAT CALIBRATION (WKG/WKGX)

1.Place a thermocouple in the geometric center of the oven cavity.

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.

a.Install a replacement thermostat and check calibration.

7.Calculate the average temperature by adding the temperature indicated when the heat lamp goes out to the temperature indicated when the heat lamp comes on and dividing this answer by 2.

A.If the average temperature is less than 15EF from the dial setting, the thermostat is properly calibrated.

B.If the average temperature is more than 15EF of the dial setting, the thermostat calibration must be adjusted.

1)Remove the thermostat knob.

2)Hold the thermostat shaft and turn the inner set screw clockwise to decrease temperature or counterclockwise to increase temperature (1/4 turn = 35EF).

8.Replace the knob and repeat step 7 until the average temperature is within tolerance.

NOTE: Allow the oven to cycle at least two times between adjustments before performing the calculation.

9.If the above adjustment can not be obtained, install a replacement thermostat and check calibration.

SOLID STATE TEMPERATURE

CONTROL TEST (WKGD/WKGDX)

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 in REMOVAL AND REPLACEMENT OF PARTS.

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.Place a thermocouple in the geometric center of the oven cavity.

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.

3.Set the temperature control to the maximum setting.

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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.

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

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).

7.Check relay voltages on the board:

A.For 120VAC controls - check across terminals 7 & 9 for input to the internal relay and 6 & 9 for output from the internal relay.

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.

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 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 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.

A.If correct, temperature control is functioning properly.

B.If incorrect, check temperature probe as outlined under TEMPERATURE PROBE TEST (WKGD/WKGDX).

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.

1.Remove the right side panel as outlined under COVERS AND PANELS in REMOVAL AND REPLACEMENT OF PARTS.

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.Place a shielded thermocouple in the geometric center of the oven cavity and determine the temperature in the oven cavity.

3.Remove the probe lead wires from the solid state temperature control.

4.Test the probe with an ohmmeter.

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.

1)Check oven for proper operation.

F32700 (February 2006)

 

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