Wolf WKG SERIES User manual

WOLF RANGE
DIVISION OF ITW FOOD EQUIPMENT GROUP, LLC LOUISVILLE, KY 40201-0696
F32700 (February 2006)
WKGD2 WITH ROAST & HOLD
SHOWN
SERVICE MANUAL
WKG SERIES
FULL SIZE
GAS CONVECTION OVENS
MODEL ML
WKG 126620
WKGD 126621
WKGC 126622
WKGX 126623
WKGDX 126624
WKGCX 126625
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.
- 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
attendedaWolfRangeServiceSchoolforthisproduct,youshouldread,
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.

FULL SIZE GAS CONVECTION OVENS
F32700 (February 2006) Page 2 of 64
TABLE OF CONTENTS
GENERAL ................................................................................4
Introduction ............................................................................4
Installation ............................................................................4
Operation .............................................................................4
Cleaning ..............................................................................4
Lubrication ............................................................................4
Specifications ..........................................................................4
Tools.................................................................................4
REMOVALANDREPLACEMENTOFPARTS ....................................................5
Covers and Panels ......................................................................5
Control Panel Components ...............................................................6
Component Panel Components ............................................................7
Temperature Probe (WKGD/WKGDX) .......................................................8
GasBurner............................................................................8
GasOrifice ............................................................................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
DoorSwitch ..........................................................................15
Mechanical Kx Thermostat (WKG/WKGX) ..................................................16
HighLimitThermostat ..................................................................16
InteriorLights .........................................................................16
CoolingFan ..........................................................................17
SERVICEPROCEDURESANDADJUSTMENTS.................................................18
SolidStateTemperatureControlCalibration(WKGD/WKGDX)...................................18
Mechanical Thermostat Calibration (WKG/WKGX) ............................................19
SolidStateTemperatureControlTest(WKGD/WKGDX)........................................19
Temperature Probe Test (WKGD/WKGDX) ..................................................20
GasPressureAdjustment................................................................21
VerificationofSparkatIgnitor ............................................................22
DoorSwitchAdjustment.................................................................22
BlowerAdjustment .....................................................................23
DoorAdjustment.......................................................................24
Door Catch Ball Adjustment (Independent Doors) .............................................24
Door Chain Adjustment (Simultaneous Doors) ................................................25

FULL SIZE GAS CONVECTION OVENS
F32700 (February 2006)Page 3 of 64
ComputerControl(WKGC/WKGCX) .......................................................26
ComputerControlCalibration(WKGC/WKGCX) ..............................................27
ELECTRICALOPERATION..................................................................28
Component Function ...................................................................28
Component Location ...................................................................30
Sequence of Operation ..................................................................35
WKG, WKGX with Roast & Hold Option (Mechanical KX Thermostat) .........................35
WKGD,WKGDXwithRoast&HoldOption(SolidStateTemperatureControl)...................39
OvenCoolCycle(SolidStateTemperatureControl) .......................................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,WKGDXSolidStateTemperatureControl ........................................49
WKGD,WKGDXSolidStateTemperatureControl,Roast&HoldOption .......................50
WKGC, WKGCX Computer Control (Roast & Hold Standard) ................................51
WIRINGDIAGRAMS ...................................................................52
WKG, WKGX Mechanical (KX) Controls ................................................52
WKG, WKGX Mechanical (KX) Controls, Roast & Hold Option ...............................54
WKGD,WKGDXSolidStateTemperatureControl ........................................56
WKGD,WKGDXSolidStateTemperatureControl,Roast&HoldOption .......................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

FULL SIZE GAS CONVECTION OVEN - GENERAL
F32700 (February 2006) Page 4 of 64
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
MODEL
FEATURES OPTIONS
CAVITY
DEPTH TEMPERATURE CONTROL DOORS (50/50)
NORMAL
(ROAST)
TIMER
NORMAL
TIMER OR
HOLD
TIMER
ROAST
&
HOLD
BLOWER
208/240/60/1
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
Digital Built in Built in Optional
WKGCX 30.5" Computer Independent 1, 3 24-Hour
Digital Built in Built in Optional
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
Refer to the Owner's Manual for specific operating
instructions.
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
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
Propane - Recommend (in. W.C.) 11.0, Min 11.0
Maximum 14.0 in. W.C. (Nat. or Prop.)
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

FULL SIZE GAS CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS
F32700 (February 2006)Page 5 of 64
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.

FULL SIZE GAS CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS
F32700 (February 2006) Page 6 of 64
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.

FULL SIZE GAS CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS
F32700 (February 2006)Page 7 of 64
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.

FULL SIZE GAS CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS
F32700 (February 2006) Page 8 of 64
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.

FULL SIZE GAS CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS
F32700 (February 2006)Page 9 of 64
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.
3. Remove the gas orifice from the spud on the
manifold and replace with the correct orifice for
the given altitude.
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.

FULL SIZE GAS CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS
F32700 (February 2006) Page 10 of 64
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.