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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 enc
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FULL SIZE GAS CONVECTION OVENS TABLE OF CONTENTS GENERAL ................................................................................ 4 Introduction ............................................................................ 4 Installation ............................................................................ 4 Operation ............................................................................. 4 Cleaning .............................................................................
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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 Opera
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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 MODEL NORMAL ROAST CAVITY TEMPERATURE DOORS TIMER OR BLOWER (ROAST) & DEPTH CONTROL (50/50) HOLD 208/240/60/1 TIMER HOLD TIMER 1, 2 WKG 26.5" Mechanical (KX) Independent 1-Hour Dial 5-Hour Dial Optional Optional 1, 2 WKGX 30.5" M
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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 contr
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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
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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. Remo
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FULL SIZE GAS CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS 7. Adjust the temperature control as outlined under TEMPERATURE PROBE SOLID STATE TEMPERATURE CONTROL (WKGD/WKGDX) CALIBRATION (WKGD/WKGDX) in SERVICE PROCEDURES AND ADJUSTMENTS. WARNING: DISCONNECT THE GAS BURNER ELECTRICAL POWER TO THE MACHINE AND FOLLOW LOCKOUT / WARNING: DISCONNECT THE TAGOUT PROCEDURES. ELECTRICAL POWER TO THE MACHINE AND FOLLOW LOCKOUT / TAGOUT PROCEDURES. 1. Remove the right side panel as outlined under COV
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FULL SIZE GAS CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS 4. Reverse procedure to install and check for proper 6. Reverse procedure to install the replacement operation. 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 7. Check for proper operation. MACHINE AND FOLLOW LOCKOUT / GAS ORIFICE TAGOUT PROCEDURES. WARNING: DISCONNECT THE WARNING: SHUT O
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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
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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
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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 ADJUSTMEN
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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 WARNING: DISCONNECT THE mounting screws of the door assembly. ELECTRICAL POWER TO THE MACHINE AND FOLLOW LOCKOUT / 4. Remov
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FULL SIZE GAS CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS NOTE: The door assembly is heavy and will drop DOOR CATCH BALL ASSEMBLY down once the last screw is removed. If removing (INDEPENDENT DOORS) 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 5. Lift up on the door assembly and swing the right MACHINE AND FOLLOW LOCKOUT / side out then m
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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 5. Reverse procedure to install the replacement inside edge of the door. 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 t
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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 3. Disconnect lead wires from high limit thermostat the control panel. then remove high limit thermostat from 3. Remove the probe guard from the oven cavity cover/mount
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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 WARNING: DISCONNECT THE component can be serviced by removing the control ELECTRICAL POWER TO THE panel as outlined under COVERS AND PANELS. MACHINE AND FOLLOW LOCKOUT / TAGOUT PROCEDURES. 2. Di
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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. A. If the average temperature is less than SOLID STATE TEMPERATURE 10 °F from the dial
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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 CALIBRATION (WKG/WKGX) calculation. 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
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FULL SIZE GAS CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS 4. Check machine data plate for correct voltage to A. If correct, temperature control is oven. Refer to diagram below for proper functioning properly. terminal locations and voltages before checking B. If incorrect, check temperature probe as the control. Use the correct terminals for the outlined under TEMPERATURE PROBE corresponding voltage. TEST (WKGD/WKGDX). 5. Turn the ON-OFF-OVEN COOL switch to ON. 1) If temperature probe
