Wolf WKG SERIES Service Manual

WKG Series Full Size GasConvection OvensWKG ML-126620WKGD ML-126621WKGC ML-126622WKGX ML-126623WKGDX ML-126624WKGCX ML-126625- NOTICE -This Manual i

Fig. 9Fig. 10TEMPERATURE PROBE (WKGD/WKGDX) Disconnect theelectrical power to the machine andfollow lockout / tagout procedures.1. Remove the RIGHT SI

Fig. 115. Remove probe by pushing it through the ovenwall and into the control panel area.Fig. 12NOTE: The hole in the oven cavity wall does not line

6. Reverse procedure to install the replacementburner.NOTE: Ensure that burner positioning bracket (Ushaped end) is inserted into slot at the rear of

FIRST GENERATION UNIT SHOWN (Before April2005)SECOND GENERATION UNIT SHOWN (After April2005 thru February 2015)CURRENT PRODUCTION SHOWN (After Februar

SECOND GENERATION UNIT SHOWN (After April2005 thru February 2015)CURRENT PRODUCTION SHOWN (After February2015)5. Reverse the procedure to install the

Fig. 274. Remove the ignition module board from themounting bracket.5. Reverse the procedure to install the replacementignition module board.SPARK IGN

Fig. 313. Remove screws securing baffle panel andremove the panel.Fig. 324. If replacing:A. Blower Only - Loosen set screws on blowerhub and using a b

12. Reconnect lead wires at the motor, replaceconduit and junction box cover.NOTE: Check data plate on motor for wiringschematic. The motor must rota

Fig. 38C. If replacing the bottom bearing, remove itfrom the door shaft or the lower sill opening.8. Reverse procedure to install door assembly andche

Fig. 42A. Door assembly parts are now accessible forinspection and/or replacement if necessary.6. Reverse procedure to re-assemble the doorassembly pa

TABLE OF CONTENTSSERVICE UPDATES ... 4SERVICE UPDATES - WKG ...

Fig. 452. Independent doors:A. Remove the door handle then remove theouter door panel.B. Lift out the inner door panel and windowassembly.NOTE: Left

Fig. 474. Reverse procedure to install the replacementswitch and check for proper adjustment asoutlined under DOOR SWITCH ADJUSTMENT.MECHANICAL KX THE

INTERIOR LIGHTS Disconnect theelectrical power to the machine andfollow lockout / tagout procedures.Lamp1. Remove the racks.2. Unscrew the glass lens

NOTE: The fan must be installed so air is pulled fromthe rear of the oven and blown into the control area.The arrow on the fan body indicates “air fl

SERVICE PROCEDURES AND ADJUSTMENTS Certain procedures in this section require electrical test or measurements whilepower is applied to the machine. Ex

a) If the average temperaturestill differs more than 10°Ffrom the dial setting, adjustthe thermostat calibrationuntil the averagetemperature is within

6. Calculate the differential by subtracting thetemperature indicated when heat lamp goes outfrom temperature indicated when heat lampcomes on.Differe

4. Test the probe with an ohmmeter.A. If the measured resistance values are insidethe given tolerance then the probe isfunctioning properly.B. If the

FIRST GENERATION SHOWN (Before April 2005)SECOND GENERATION UNIT SHOWN (After April2005 thru February 2015) THE FOLLOWING STEPSREQUIRE POWER TO BE APP

Fig. 594. Install hose barb adapter and attach manometertube.5. Turn gas supply to the oven back on.6. Plug the unit in and turn the power switch ON.7

OPERATION ... 34SETUP MODE ...

not occur even though the sparking circuit isfunctioning properly.Fig. 614. Plug the oven in and set the temperature controlto the maximum setting.5.

Fig. 634. Reverse the procedure to install.DOOR ADJUSTMENT Disconnect theelectrical power to the machine andfollow lockout / tagout procedures.1. Chec

4. Move the door until proper alignment is achievedthen tighten the screws on the upper doorbearing hardware.5. Repeat STEP 3 and STEP 4 on the opposi

4. Apply lubricant at the top of the door catchassembly to lubricate the internal spring. SeeLUBRICATION.Fig. 685. Close the doors and check them for

E. When the doors are opened, theturnbuckles will move away from each other.F. The stop cable must be positioned where itmoves freely and does not get

MENUALTERNATING ON DISPLAYPARAMETER DATARange Low 1 rL1 75Range High 1 rH1 500Hysteresis HYS1 3Calibration Offset CAL1 0Exit Setup Modeand return toOp

3) Exit the setup mode.7. Allow the oven to cycle at least two timesbetween adjustments.A. If the temperature variance still differsmore than 5°F from

ELECTRICAL OPERATIONCOMPONENT FUNCTIONPower Switch (S1) ... Determines the mode of operation; ON, OFF, or COOL DOWN.Oven Light Switch (S2)...

SSR1 & SSR2 (WKGC/WKGCX) ...When SSR1 is energized by computer control, connects power to blower motor for Hi fanspeed operation in nor

WKG/WKGX - Plug, Socket and Components (Standard Controls)WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATIONPage 39 of 74 F32700 Rev. B

SERVICE UPDATESSERVICE UPDATES - WKGFebruary 2015Updated Photos Added to the Following DataModules• GAS BURNER• GAS ORIFICE• GAS SOLENOID VALVE• ROLLE

WKGD/WKGDX - Plug, Socket and Components (Standard Controls)WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATIONF32700 Rev. B (0315) Page

WKG, WKGX/WKGD, WKGDX - Plug, Socket and Components (Roast & Hold Option)WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATIONPage 41 o

WKGC/WKGCX - Plug, Socket and Components (Roast & Hold Standard)WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATIONF32700 Rev. B (031

SEQUENCE OF OPERATIONWKG, WKGX With Roast & Hold Option(Mechanical KX Thermostat)Schematic diagram 10832 will be used to explain theelectrical seq

a) Power is connected throughthe function switch (S3)contacts and the convectionfan motor is energized (fanspeed Hi).b. When the convection fan motorr

H. Control thermostat in the OFF position(OPEN).I. High limit switch CLOSED.J. Roast timer (normal cooking) in the OFFposition..K. Roast and Hold time

If a flame is not"sensed" after 7seconds of sparking,the "no ignition" lightcomes back on, 2ndvalve (main) on the gasvalve is de-e

a. Heat relay (R3) contacts (N.O.)close and the heating circuit ispowered.a) Ignition control module isenergized.b) No ignition light (red) comesON, m

3. Power switch (S1) turned ON.A. Component cooling fan energized.B. Power ON light (Amber) comes ON.C. Power to one side of the followingcomponents:

1) Heat light goes out.2) Power removed from heat relay (R3).a. R3 normally open (N.O.) contactsOPEN.a) Power removed from 2ndvalve (main) on the gas

GENERALINTRODUCTION Procedures in this manual will apply to all models unless specified. Pictures and illustrations can be of any modelunless the pict

NOTE: Gas does not flow to the burner until the 2ndvalve (main) is energized.2) With door switch closed, power isapplied to motor speed (Hi/Low) rela

occurs: ROAST & HOLD timer is turned OFF; functionswitch (S3) is turned back to Normal ROAST (normalcooking) or Power switch (S1) is turned to the

5. Oven reaches the "fixed" hold temperature andhold thermostat opens.A. Heat light goes out.B. Power removed from heat relay (R3) andthe co

C. Component cooling fan.4. The oven will remain in this condition until thepower switch (S1) is turned to the OFF or ONposition.WKGC, WKGCX (Roast &a

b) When the convection fanmotor reaches operatingspeed, the centrifugal switch(N.O.) on the motor closes.3) With the 120VAC output from thecontrol act

4. The display flashes HOLD as the oven entersHOLD mode. This is also considered secondstage cooking (oven heating stops but productcontinues to cook

Fig. 77WKG, WKGX MECHANICAL (KX) CONTROLS,ROAST & HOLD OPTIONWKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATIONF32700 Rev. B (0315)

Fig. 78WKGD, WKGDX SOLID STATE TEMPERATURECONTROLWKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATIONPage 57 of 74 F32700 Rev. B (0315)

Fig. 79WKGD, WKGDX SOLID STATE TEMPERATURECONTROL, ROAST & HOLD OPTIONWKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATIONF32700 Rev.

Fig. 80WKGC, WKGCX COMPUTER CONTROL (ROAST &HOLD STANDARD)WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATIONPage 59 of 74 F32700 Rev

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

Fig. 81WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATIONF32700 Rev. B (0315) Page 60 of 74

WIRING DIAGRAMSWKG, WKGX MECHANICAL (KX) CONTROLSFig. 82WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATIONPage 61 of 74 F32700 Rev. B (0

Fig. 83WKG, WKGX MECHANICAL(KX) CONTROLS,ROAST & HOLD OPTIONWKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATIONF32700 Rev. B (0315) P

Fig. 84WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATIONPage 63 of 74 F32700 Rev. B (0315)

Fig. 85WKGD, WKGDX SOLID STATE TEMPERATURECONTROLWKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATIONF32700 Rev. B (0315) Page 64 of 74

Fig. 86WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATIONPage 65 of 74 F32700 Rev. B (0315)

Fig. 87WKGD, WKGDX SOLID STATE TEMPERATURECONTROL, ROAST & HOLD OPTIONWKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATIONF32700 Rev.

Fig. 88WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATIONPage 67 of 74 F32700 Rev. B (0315)

Fig. 89WKGC, WKGCX COMPUTER CONTROL (ROAST &HOLD STANDARD)WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATIONF32700 Rev. B (0315) Pag

Fig. 90WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATIONPage 69 of 74 F32700 Rev. B (0315)

REMOVAL AND REPLACEMENT OF PARTSCOVERS AND PANELS Disconnect theelectrical power to the machine andfollow lockout / tagout procedures. SHUT OFF THE GA

Fig. 91WKG Series Full Size Gas Convection Ovens - ELECTRICAL OPERATIONF32700 Rev. B (0315) Page 70 of 74

TROUBLESHOOTING Certain procedures in this section require electrical test or measurements whilepower is applied to the machine. Exercise extreme caut

SYMPTOMS POSSIBLE CAUSESExcessive or low heat.1. Temperature probe malfunction on models WKGD,WKGDX. (Thermostat malfunction on models WKG,WKGX)2. Tem

SYMPTOM POSSIBLE CAUSESOven not hot enough.1. Probe malfunction.2. Control range high (rH1) setting to low. See SETUPMODE under COMPUTER CONTROL (WKGC

CODE & PROBLEM PROBABLE CAUSE SOLUTIONEr12 - Shorted sensor• Incorrect sensor type• Measuring temperature outsidethe sensor range• Check the InP1

CONTROL PANEL COMPONENTS Disconnect theelectrical power to the machine andfollow lockout / tagout procedures.Removable Components Procedure1. Remove t

Fig. 7COMPONENT PANELCOMPONENTS Disconnect theelectrical power to the machine andfollow lockout / tagout procedures.Removable Components Procedure1. R