1. Manuals
  2. Brands
  3. Wolf Manuals
  4. Convection Oven
  5. WKG SERIES
  6. Service manual

Wolf WKG Series Service Manual

Hide thumbs Also See for WKG Series:
Table of Contents

Advertisement

Quick Links

Download this manual
This Manual is prepared for the use of trained Wolf Service
Technicians and should not be used by those not properly
qualified.
This manual is not intended to be all encompassing. If you have
not attended a Wolf 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 Wolf Service Technician.
The reproduction, transfer, sale or other use of this Manual,
without the express written consent of Wolf, is prohibited.
This manual has been provided to you by ITW Food Equipment
Group LLC ("ITW FEG") without charge and remains the property
of ITW FEG, and by accepting this manual you agree that you will
return it to ITW FEG promptly upon its request for such return at
any time in the future.
A product of Wolf
SERVICE MANUAL
WKG Series Full Size Gas
Convection Ovens
WKG
ML-126620
WKGD
ML-126621
WKGC
ML-126622
WKGX
ML-126623
WKGDX
ML-126624
WKGCX
ML-126625
- NOTICE -
3600 North Point Blvd Baltimore, MD 21222
F32700 Rev. B (0315)

Advertisement

Table of Contents
loading

Related Manuals for Wolf WKG Series

Summary of Contents for Wolf WKG Series

  • Page 1 ML-126624 WKGCX ML-126625 - NOTICE - This Manual is prepared for the use of trained Wolf Service Technicians and should not be used by those not properly qualified. This manual is not intended to be all encompassing. If you have...

  • Page 2: Table Of Contents

    WKG Series Full Size Gas Convection Ovens TABLE OF CONTENTS SERVICE UPDATES ..................4 SERVICE UPDATES - WKG .
  • Page 3 WKG Series Full Size Gas Convection Ovens OPERATION ..................34 SETUP MODE .

  • Page 4: Service Updates

    WKG Series Full Size Gas Convection Ovens - SERVICE UPDATES SERVICE UPDATES SERVICE UPDATES - WKG February 2015 Updated Photos Added to the Following Data Modules • GAS BURNER • GAS ORIFICE • GAS SOLENOID VALVE • ROLLER LATCH ASSEMBLY •...

  • Page 5: General

    WKG Series Full Size Gas Convection Ovens - 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.

  • Page 6: Tools

    WKG Series Full Size Gas Convection Ovens - GENERAL Propane Gas - 44,000 BTU input at 10.0 in. W.C. Units after Serial Number Break (WKGD 481835795) Propane Gas - 50,000 BTU input at 10.0 in. W.C. Gas Line Pressures Natural - Recommend (in. W.C.) 7.0, Min 5.0 Natural - Recommend (in W.

  • Page 7: Removal And Replacement Of Parts

    WKG Series Full Size Gas Convection Ovens - REMOVAL AND REPLACEMENT OF PARTS REMOVAL AND REPLACEMENT OF PARTS COVERS AND PANELS Disconnect the electrical power to the machine and follow lockout / tagout procedures. SHUT OFF THE GAS BEFORE SERVICING THE UNIT.

  • Page 8: Control Panel Components

    WKG Series Full Size Gas Convection Ovens - REMOVAL AND REPLACEMENT OF PARTS CONTROL PANEL COMPONENTS Disconnect the electrical power to the machine and follow lockout / tagout procedures. Removable Components Procedure Remove the CONTROL PANEL. Remove the component being replaced.

  • Page 9: Component Panel Components

    WKG Series Full Size Gas Convection Ovens - REMOVAL AND REPLACEMENT OF PARTS Fig. 7 Fig. 8 COMPONENT PANEL COMPONENTS Disconnect the electrical power to the machine and follow lockout / tagout procedures. Removable Components Procedure Remove the RIGHT SIDE PANEL.

  • Page 10: Temperature Probe (Wkgd/Wkgdx)

    WKG Series Full Size Gas Convection Ovens - REMOVAL AND REPLACEMENT OF PARTS Fig. 10 Fig. 9 TEMPERATURE PROBE (WKGD/ WKGDX) Disconnect the electrical power to the machine and follow lockout / tagout procedures. Remove the RIGHT SIDE PANEL. NOTE: If right side panel is not accessible, this component can be serviced by removing the CONTROL PANEL.

  • Page 11: Gas Burner

    WKG Series Full Size Gas Convection Ovens - REMOVAL AND REPLACEMENT OF PARTS Fig. 11 Fig. 13 Remove probe by pushing it through the oven Remove the bolts securing the gas manifold to wall and into the control panel area.

  • Page 12: Gas Orifice

    WKG Series Full Size Gas Convection Ovens - REMOVAL AND REPLACEMENT OF PARTS 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.
  • Page 13 WKG Series Full Size Gas Convection Ovens - REMOVAL AND REPLACEMENT OF PARTS CURRENT PRODUCTION SHOWN (After February 2015) FIRST GENERATION UNIT SHOWN (Before April 2005) Loosen the bolts securing the valve and bracket assembly then remove the screws securing the valve to the bracket.

  • Page 14: Ignition Control Module

    WKG Series Full Size Gas Convection Ovens - REMOVAL AND REPLACEMENT OF PARTS Verify gas pressure as outlined under GAS PRESSURE ADJUSTMENT (for units before February 2015) or GAS VALVE PRESSURE CHECK (for units after February 2015) and check for proper operation.

  • Page 15: Spark Igniter And Flame Sense

    WKG Series Full Size Gas Convection Ovens - REMOVAL AND REPLACEMENT OF PARTS 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. PREVIOUS PRODUCTION SHOWN Fig.
  • Page 16 WKG Series Full Size Gas Convection Ovens - REMOVAL AND REPLACEMENT OF PARTS Fig. 33 Fig. 31 Remove the nuts that secure the motor mounting Remove screws securing baffle panel and plate to the rear wall. remove the panel. Fig. 34 Fig.

  • Page 17: Oven Doors And Bearings (Independent Doors)

    WKG Series Full Size Gas Convection Ovens - REMOVAL AND REPLACEMENT OF PARTS 12. Reconnect lead wires at the motor, replace OVEN DOORS AND BEARINGS conduit and junction box cover. (INDEPENDENT DOORS) NOTE: Check data plate on motor for wiring schematic.

  • Page 18: Oven Doors (Simultaneous Doors)

    WKG Series Full Size Gas Convection Ovens - REMOVAL AND REPLACEMENT OF PARTS Fig. 38 Fig. 40 If replacing the bottom bearing, remove it Remove the lower door seal strip to expose the from the door shaft or the lower sill opening.

  • Page 19: Roller Latch Assembly (Independent Doors)

    WKG Series Full Size Gas Convection Ovens - REMOVAL AND REPLACEMENT OF PARTS Reverse procedure to install. DOOR CATCH BALL ASSEMBLY (INDEPENDENT DOORS) NOTE: For units with serial number starting with 48 made before 8/13/07 and serial number starting with 54 made before 8/27/07.

  • Page 20: Door Switch

    WKG Series Full Size Gas Convection Ovens - REMOVAL AND REPLACEMENT OF PARTS Fig. 45 Independent doors: Remove the door handle then remove the outer door panel. Lift out the inner door panel and window assembly. NOTE: Left door only - remove door seal from the inside edge of the door.

  • Page 21: Mechanical Kx Thermostat (Wkg/Wkgx)

    WKG Series Full Size Gas Convection Ovens - REMOVAL AND REPLACEMENT OF PARTS HIGH LIMIT THERMOSTAT Disconnect the electrical power to the machine and follow lockout / tagout procedures. Take out racks from the oven. Remove the high limit thermostat cover/mounting plate from inside the oven cavity at the top.

  • Page 22: Interior Lights

    WKG Series Full Size Gas Convection Ovens - REMOVAL AND REPLACEMENT OF PARTS Depress the retaining tabs and pull the socket out INTERIOR LIGHTS from the oven, far enough to disconnect the lead wires. Remove the socket from the oven.
  • Page 23 WKG Series Full Size Gas Convection Ovens - REMOVAL AND REPLACEMENT OF PARTS 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.

  • Page 24: Service Procedures And Adjustments

    WKG Series Full Size Gas Convection Ovens - SERVICE PROCEDURES AND ADJUSTMENTS SERVICE PROCEDURES AND ADJUSTMENTS Certain procedures in this section require electrical test or measurements while power is applied to the machine. Exercise extreme caution at all times and follow Arc Flash procedures.

  • Page 25: Mechanical Thermostat Calibration (Wkg/Wkgx)

    WKG Series Full Size Gas Convection Ovens - SERVICE PROCEDURES AND ADJUSTMENTS If the average temperature Calculate the average temperature by adding the still differs more than 10°F temperature indicated when the lamp goes out to from the dial setting, adjust...

  • Page 26: Temperature Probe Test (Wkgd/Wkgdx)

    WKG Series Full Size Gas Convection Ovens - SERVICE PROCEDURES AND ADJUSTMENTS Calculate the differential by subtracting the temperature indicated when heat lamp goes out from temperature indicated when heat lamp comes on. Differential = Heat lamp OFF - Heat lamp ON Example: 360°...

  • Page 27: Gas Pressure Adjustment (Units Up To February 2015)

    WKG Series Full Size Gas Convection Ovens - SERVICE PROCEDURES AND ADJUSTMENTS Test the probe with an ohmmeter. If the measured resistance values are inside the given tolerance then the probe is functioning properly. If the measured resistance values are outside the given tolerance then replace the probe and retest.

  • Page 28: Gas Valve Pressure Check (Units After February 2015)

    WKG Series Full Size Gas Convection Ovens - SERVICE PROCEDURES AND ADJUSTMENTS Set the temperature control to its highest setting and allow burner to ignite. NOTE: The burner must be lit during test and adjustment. Turn the set screw to obtain the proper gas pressure (clockwise = pressure increase;...

  • Page 29: Verification Of Spark At Ignitor

    WKG Series Full Size Gas Convection Ovens - SERVICE PROCEDURES AND ADJUSTMENTS Install hose barb adapter and attach manometer tube. Turn gas supply to the oven back on. Plug the unit in and turn the power switch ON. Set the temperature control to its highest setting and allow burner to ignite.

  • Page 30: Door Switch Adjustment

    WKG Series Full Size Gas Convection Ovens - SERVICE PROCEDURES AND ADJUSTMENTS not occur even though the sparking circuit is functioning properly. Fig. 62 Install the top front cover Fig. 61 Apply power to the oven and check for proper operation.

  • Page 31: Door Adjustment

    WKG Series Full Size Gas Convection Ovens - SERVICE PROCEDURES AND ADJUSTMENTS Fig. 63 Reverse the procedure to install. DOOR ADJUSTMENT Disconnect the electrical power to the machine and follow lockout / tagout procedures. Check the doors to make sure they have an equal gap between them and that the vertical edge of the door is parallel to the vertical door seal.

  • Page 32: Door Strike Adjustment (Independent Doors)

    WKG Series Full Size Gas Convection Ovens - SERVICE PROCEDURES AND ADJUSTMENTS Move the door until proper alignment is achieved Each oven door should open with a force of 8 to then tighten the screws on the upper door 25 pounds when pulled at the handle. The bearing hardware.

  • Page 33: Door Chain Adjustment (Simultaneous Doors)

    WKG Series Full Size Gas Convection Ovens - SERVICE PROCEDURES AND ADJUSTMENTS Apply lubricant at the top of the door catch Turn set screw inside the catch assembly to lubricate the internal spring. See assembly housing clockwise to LUBRICATION. increase tension on catch ball and counterclockwise to decrease tension on catch ball.

  • Page 34: Computer Control (Wkgc/Wkgcx)

    WKG Series Full Size Gas Convection Ovens - SERVICE PROCEDURES AND ADJUSTMENTS When the doors are opened, the Install the lower front cover. turnbuckles will move away from each other. COMPUTER CONTROL (WKGC/ The stop cable must be positioned where it WKGCX) moves freely and does not get pinched.

  • Page 35: Probe Test

    WKG Series Full Size Gas Convection Ovens - SERVICE PROCEDURES AND ADJUSTMENTS ALTERNATING ON DISPLAY COMPUTER CONTROL MENU PARAMETER DATA CALIBRATION (WKGC/WKGCX) Range Low 1 Place a thermocouple in the geometric center of Range High 1 the oven cavity. Hysteresis...
  • Page 36 WKG Series Full Size Gas Convection Ovens - SERVICE PROCEDURES AND ADJUSTMENTS Exit the setup mode. Allow the oven to cycle at least two times between adjustments. If the temperature variance still differs more than 5°F from the set point, verify the correct calibration offset value was entered and retained.

  • Page 37: Electrical Operation

    WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATION ELECTRICAL OPERATION COMPONENT FUNCTION Power Switch (S1) . . . Determines the mode of operation; ON, OFF, or COOL DOWN. Oven Light Switch (S2) Controls the oven cavity lights......

  • Page 38: Component Location

    WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATION SSR1 & SSR2 (WKGC/ When SSR1 is energized by computer control, connects power to blower motor for Hi fan WKGCX) ... . .
  • Page 39 WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATION WKG/WKGX - Plug, Socket and Components (Standard Controls) Page 39 of 74 F32700 Rev. B (0315)
  • Page 40 WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATION WKGD/WKGDX - Plug, Socket and Components (Standard Controls) F32700 Rev. B (0315) Page 40 of 74...
  • Page 41 WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATION WKG, WKGX/WKGD, WKGDX - Plug, Socket and Components (Roast & Hold Option) Page 41 of 74 F32700 Rev. B (0315)
  • Page 42 WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATION WKGC/WKGCX - Plug, Socket and Components (Roast & Hold Standard) F32700 Rev. B (0315) Page 42 of 74...

  • Page 43: Sequence Of Operation

    WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATION Power to motor speed (Hi/Low) relay (R1) SEQUENCE OF OPERATION normally open (N.O.) contacts and hold relay (R2) common ©). WKG, WKGX With Roast & Hold Option Component cooling fan energized.
  • Page 44 WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATION Power is connected through The oven will continue to cycle on the thermostat the function switch (S3) until the doors are opened or the power switch contacts and the convection...

  • Page 45: Convection Fan Motor Energized

    WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATION Control thermostat in the OFF position With door switch closed, power is (OPEN). connected through a second set of contacts on the power switch (S1), High limit switch CLOSED. through the thermostat contacts,...

  • Page 46: Power Switch (S1) Is Turned To The Off Or Cool Down Position

    WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATION If a flame is not NOTE: To Roast then Hold the cooked product at a "sensed" after 7 fixed temperature, the Roast & Hold timer must be seconds of sparking, used and the function switch (S3) must also be set to the "no ignition"...

  • Page 47: Wkgd, Wkgdx With Roast & Hold Option

    WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATION Heat relay (R3) contacts (N.O.) The oven will continue to cycle on the hold close and the heating circuit is thermostat until the "Cook & Hold timer is turned powered.
  • Page 48 WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATION Power switch (S1) turned ON. Power is also connected back through a second set of contacts on the power Component cooling fan energized. switch (S1) to terminal 8 on the Power ON light (Amber) comes ON.
  • Page 49 WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATION Heat light goes out. Oven properly grounded. Power removed from heat relay (R3). Gas supply valve ON. R3 normally open (N.O.) contacts Gas combination control valve ON. OPEN. Power switch (S1) OFF.
  • Page 50 WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATION NOTE: Gas does not flow to the burner until the 2nd No ignition light (red) comes valve (main) is energized. ON, module performs a self diagnostic test for 4 seconds,...
  • Page 51 WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATION occurs: ROAST & HOLD timer is turned OFF; function NOTE: This is considered second stage cooking in switch (S3) is turned back to Normal ROAST (normal the ROAST & HOLD cycle where the stored heat in cooking) or Power switch (S1) is turned to the OFF or the oven continues to cook the product.

  • Page 52: Oven Is On

    WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATION Oven reaches the "fixed" hold temperature and Power to motor speed (Hi/Low) relay (R1) hold thermostat opens. normally open (N.O.) contacts and to common ©) on hold relay (R2). Power is Heat light goes out.

  • Page 53: Wkgc, Wkgcx (Roast & Hold Standard On Computer Model)

    WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATION Component cooling fan. Power is available to the oven light switch (S2). The oven will remain in this condition until the power switch (S1) is turned to the OFF or ON Power to terminal 1 on solid state relay 1 position.
  • Page 54 WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATION When the convection fan The 2nd valve (main) on the motor reaches operating gas valve is de-energized speed, the centrifugal switch and gas flow to the burner (N.O.) on the motor closes.

  • Page 55: Cool Down Cycle (Computer Control Model)

    WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATION The display flashes HOLD as the oven enters Power switch (S1) set to either ON or OFF. HOLD mode. This is also considered second Power Switch (S1) turned to COOL DOWN.

  • Page 56: Wkg, Wkgx Mechanical (Kx) Controls, Roast & Hold Option

    WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATION Fig. 77 WKG, WKGX MECHANICAL (KX) CONTROLS, ROAST & HOLD OPTION F32700 Rev. B (0315) Page 56 of 74...

  • Page 57: Wkgd, Wkgdx Solid State Temperature Control

    WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATION Fig. 78 WKGD, WKGDX SOLID STATE TEMPERATURE CONTROL Page 57 of 74 F32700 Rev. B (0315)

  • Page 58: Wkgd, Wkgdx Solid State Temperature Control, Roast & Hold Option

    WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATION Fig. 79 WKGD, WKGDX SOLID STATE TEMPERATURE CONTROL, ROAST & HOLD OPTION F32700 Rev. B (0315) Page 58 of 74...

  • Page 59: Wkgc, Wkgcx Computer Control (Roast & Hold Standard)

    WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATION Fig. 80 WKGC, WKGCX COMPUTER CONTROL (ROAST & HOLD STANDARD) Page 59 of 74 F32700 Rev. B (0315)
  • Page 60 WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATION Fig. 81 F32700 Rev. B (0315) Page 60 of 74...

  • Page 61: Wiring Diagrams

    WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATION WIRING DIAGRAMS WKG, WKGX MECHANICAL (KX) CONTROLS Fig. 82 Page 61 of 74 F32700 Rev. B (0315)

  • Page 62: Wkg, Wkgx Mechanical(Kx) Controls, Roast & Hold Option

    WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATION Fig. 83 WKG, WKGX MECHANICAL(KX) CONTROLS, ROAST & HOLD OPTION F32700 Rev. B (0315) Page 62 of 74...
  • Page 63 WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATION Fig. 84 Page 63 of 74 F32700 Rev. B (0315)

  • Page 64: Wkgd, Wkgdx Solid State Temperature Control

    WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATION Fig. 85 WKGD, WKGDX SOLID STATE TEMPERATURE CONTROL F32700 Rev. B (0315) Page 64 of 74...
  • Page 65 WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATION Fig. 86 Page 65 of 74 F32700 Rev. B (0315)

  • Page 66: Wkgd, Wkgdx Solid State Temperature Control, Roast & Hold Option

    WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATION Fig. 87 WKGD, WKGDX SOLID STATE TEMPERATURE CONTROL, ROAST & HOLD OPTION F32700 Rev. B (0315) Page 66 of 74...
  • Page 67 WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATION Fig. 88 Page 67 of 74 F32700 Rev. B (0315)

  • Page 68: Wkgc, Wkgcx Computer Control (Roast & Hold Standard)

    WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATION Fig. 89 WKGC, WKGCX COMPUTER CONTROL (ROAST & HOLD STANDARD) F32700 Rev. B (0315) Page 68 of 74...
  • Page 69 WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATION Fig. 90 Page 69 of 74 F32700 Rev. B (0315)
  • Page 70 WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATION Fig. 91 F32700 Rev. B (0315) Page 70 of 74...

  • Page 71: Troubleshooting

    WKG Series Full Size Gas Convection Ovens - TROUBLESHOOTING TROUBLESHOOTING Certain procedures in this section require electrical test or measurements while power is applied to the machine. Exercise extreme caution at all times and follow Arc Flash procedures. If test points are not easily accessible, disconnect power and follow Lockout/Tagout procedures, attach test equipment and reapply power to test.

  • Page 72: Computer Control Models Only

    WKG Series Full Size Gas Convection Ovens - TROUBLESHOOTING SYMPTOMS POSSIBLE CAUSES Temperature probe malfunction on models WKGD, WKGDX. (Thermostat malfunction on models WKG, WKGX) Excessive or low heat. Temperature control board malfunction. Gas pressure Insufficient. Gas orifice plugged or obstructed.

  • Page 73: Error Codes

    WKG Series Full Size Gas Convection Ovens - TROUBLESHOOTING SYMPTOM POSSIBLE CAUSES Probe malfunction. Control range high (rH1) setting to low. See SETUP Oven not hot enough. MODE under COMPUTER CONTROL (WKGC, WKGCX). Control malfunction. Error Codes NOTE: If the cause of the error is not apparent, check...

  • Page 74: Wolf

    WKG Series Full Size Gas Convection Ovens - TROUBLESHOOTING CODE & PROBLEM PROBABLE CAUSE SOLUTION • Check the InP1 setup parameter. Verify it matches • Incorrect sensor type your sensor. Er12 - Shorted sensor • Measuring temperature outside • Check sensor and connections the sensor range for a reversed or open sensor.

Table of Contents