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Wolf 126620, Service Manual, Page: 60 / 64

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Wolf 126620 Service Manual Download Page 60

FULL SIZE GAS CONVECTION OVENS - ELECTRICAL OPERATION

F32700 (February 2006)

Page 60 of  64

WKGC, WKGCX Computer Control (Roast & Hold Standard)

Summary of Contents for 126620

Page 1: ...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 th...

Page 2: ...s 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 Contro...

Page 3: ... 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 ...

Page 4: ...lt 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 ins...

Page 5: ...e 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 wi...

Page 6: ...S 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 ...

Page 7: ...OLLOW 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...

Page 8: ... 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 DISCON...

Page 9: ... 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 M...

Page 10: ...ING 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 ...

Page 11: ...GOUT 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 3 Remove screws securing baffle panel and remove the panel 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 positio...

Page 12: ...eplace 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 Po...

Page 13: ...arings 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 8 Reverse procedure to install door assembly and check for proper adjustment as outlined under DOOR ADJUSTMENT and DOOR SW...

Page 14: ... 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 prope...

Page 15: ...acing 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 5 Reverse procedure to install the replacement window DOOR SWITCH WARNING DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AND FOLLOW ...

Page 16: ... 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...

Page 17: ...T 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 ...

Page 18: ... 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 av...

Page 19: ...an 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 ...

Page 20: ...etting 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 outl...

Page 21: ... by removing the control panel as outlined under COVERS AND PANELS 2 Remove the plug from the manifold pressure port 3 Install hose barb adapter and attach manometer tube 4 Remove adjustment screw cap from the gas valve and turn gas supply to the oven back on 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 Accurat...

Page 22: ... even though the sparking circuit is functioning properly 4 Plug the oven in and set the temperature control to the maximum setting 5 Turn the power switch ON 6 Sparking should occur after a 4 second delay for a duration of 7 seconds then repeat twice after a 15 second purge time Arching from the ignition cable to the oven frame should be observed DOOR SWITCH ADJUSTMENT WARNING DISCONNECT THE ELEC...

Page 23: ...R 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 squar...

Page 24: ...t 4 Move the door until proper alignment is achieved then tighten the screws on the upper door bearing hardware 5 Repeat step 3 and 4 on the opposite door if necessary DOOR CATCH BALL ADJUSTMENT INDEPENDENT DOORS 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...

Page 25: ...s to remain closed during normal operation and allow opening without exertion by the user NOTE The amount of tension on catch ball determines the opening force of door 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 2 Continue adjustment until proper door ope...

Page 26: ...cover COMPUTER CONTROL WKGC WKGCX 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 C...

Page 27: ...tioning properly 1 Replace the SSR and check for proper operation B If 120 VAC is present component is functioning properly 5 Re assemble oven and check for proper operation COMPUTER CONTROL CALIBRATION WKGC WKGCX 1 Place a thermocouple in the geometric center of the oven cavity 2 Set the ON OFF OVEN COOL switch to ON A If the set point temperature is 350 F proceed to step 4 B If the set point tem...

Page 28: ...AST 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 ROA...

Page 29: ...ST 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 fa...

Page 30: ...afety and 2nd valve 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 s...

Page 31: ...FULL SIZE GAS CONVECTION OVENS ELECTRICAL OPERATION F32700 February 2006 Page 31 of 64 WKG WKGX Plug Socket and Components Standard Controls ...

Page 32: ...FULL SIZE GAS CONVECTION OVENS ELECTRICAL OPERATION F32700 February 2006 Page 32 of 64 WKGD WKGDX Plug Socket and Components Standard Controls ...

Page 33: ...FULL SIZE GAS CONVECTION OVENS ELECTRICAL OPERATION F32700 February 2006 Page 33 of 64 WKG WKGX WKGD WKGDX Plug Socket and Components Roast Hold Option ...

Page 34: ...FULL SIZE GAS CONVECTION OVENS ELECTRICAL OPERATION F32700 February 2006 Page 34 of 64 WKGC WKGCX Plug Socket and Components Roast Hold Standard ...

Page 35: ...wer 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 D Power to one side of the following components Normal ROAST timer terminal 1 ROAST HOLD timer terminal 1 transformer primary T1 NOTE Power is available to the oven light switch wire 20 to turn the oven cavity lights ON when the light switch is ...

Page 36: ...rs are opened or the power switch S1 is turned to the OFF or OVEN COOL position 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 1 With the power switch turned ON power is supplied to timer 2 Set ROAST timer to desired time normal cooking A Contacts...

Page 37: ...nected 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 convection fan motor a Heat light clear comes ON 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 a Motor speed relay R...

Page 38: ...t 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 normally open N O contacts close a Power to one side of hold thermostat NOTE When temperature is above 160 F 12 the hold thermostat contacts are open 3 Relay R4 is energized R4 contacts change state and both sets of normally closed N C contacts transfer t...

Page 39: ...tor speed Hi Low relay coil R1 hold relay coil R2 and the component cooling fan B Oven properly grounded C Gas supply valve ON D Gas combination control valve 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 H Temperature control dial set to lowest temperature fully counterclockwis...

Page 40: ... 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 If a flame is not SENSED after 7 seconds of sparking the NO IGNITION light comes back on 2nd valve 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...

Page 41: ...ide of the following components Normal ROAST timer terminal 1 ROAST HOLD timer terminal 1 transformer primary T1 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 contact...

Page 42: ...e burner stops NOTE This is considered first stage cooking in the ROAST HOLD cycle 5 The oven will continue to cycle on the 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 Timer Cycle Roast Hold Cooking NOTE The ROAST HOLD timer ope...

Page 43: ...ITION 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 If a flame is not SENSED after 7 seconds of sparking the NO IGNITION light comes back on 2nd valve main on the gas valve is de energized and gas flow to the burner stops Ignition trial cycle repeats after a 15 seco...

Page 44: ...o 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 1 Power ON light Amber comes ON 2 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 conta...

Page 45: ...onnected 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 NOTE Power is not applied to the heat relay coil R1 until the centrifugal switch contacts on the convection fan motor close c The controls 5VDC output from pins C2 2 and C2 8 is activated and SSR1 relay is ener...

Page 46: ...m 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 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 tim...

Page 47: ...FULL SIZE GAS CONVECTION OVENS ELECTRICAL OPERATION F32700 February 2006 Page 47 of 64 SCHEMATICS WKG WKGX Mechanical KX Controls ...

Page 48: ...FULL SIZE GAS CONVECTION OVENS ELECTRICAL OPERATION F32700 February 2006 Page 48 of 64 WKG WKGX Mechanical KX Controls Roast Hold Option ...

Page 49: ...FULL SIZE GAS CONVECTION OVENS ELECTRICAL OPERATION F32700 February 2006 Page 49 of 64 WKGD WKGDX Solid State Temperature Control ...

Page 50: ...FULL SIZE GAS CONVECTION OVENS ELECTRICAL OPERATION F32700 February 2006 Page 50 of 64 WKGD WKGDX Solid State Temperature Control Roast Hold Option ...

Page 51: ...FULL SIZE GAS CONVECTION OVENS ELECTRICAL OPERATION F32700 February 2006 Page 51 of 64 WKGC WKGCX Computer Control Roast Hold Standard ...

Page 52: ...FULL SIZE GAS CONVECTION OVENS ELECTRICAL OPERATION F32700 February 2006 Page 52 of 64 WIRING DIAGRAMS WKG WKGX Mechanical KX Controls ...

Page 53: ...FULL SIZE GAS CONVECTION OVENS ELECTRICAL OPERATION F32700 February 2006 Page 53 of 64 ...

Page 54: ...FULL SIZE GAS CONVECTION OVENS ELECTRICAL OPERATION F32700 February 2006 Page 54 of 64 WKG WKGX Mechanical KX Controls Roast Hold Option ...

Page 55: ...FULL SIZE GAS CONVECTION OVENS ELECTRICAL OPERATION F32700 February 2006 Page 55 of 64 ...

Page 56: ...FULL SIZE GAS CONVECTION OVENS ELECTRICAL OPERATION F32700 February 2006 Page 56 of 64 WKGD WKGDX Solid State Temperature Control ...

Page 57: ...FULL SIZE GAS CONVECTION OVENS ELECTRICAL OPERATION F32700 February 2006 Page 57 of 64 ...

Page 58: ...FULL SIZE GAS CONVECTION OVENS ELECTRICAL OPERATION F32700 February 2006 Page 58 of 64 WKGD WKGDX Solid State Temperature Control Roast Hold Option ...

Page 59: ...FULL SIZE GAS CONVECTION OVENS ELECTRICAL OPERATION F32700 February 2006 Page 59 of 64 ...

Page 60: ...FULL SIZE GAS CONVECTION OVENS ELECTRICAL OPERATION F32700 February 2006 Page 60 of 64 WKGC WKGCX Computer Control Roast Hold Standard ...

Page 61: ...FULL SIZE GAS CONVECTION OVENS ELECTRICAL OPERATION F32700 February 2006 Page 61 of 64 ...

Page 62: ...oes 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 Insuffic...

Page 63: ... 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 cau...

Page 64: ... sensor error 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 Measuring temperature outside the sensor range Check the InP1 setup parameter Verify it matches your sensor Check sensor and connections for a reversed or open sensor CONDENSED SPARE PARTS LIST WKG SERIES Part No...

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