Vulcan-Hart VCIEC, VC6ED, VC6EC, VC4ES, VC4ED, VC6ES Mechanical KX Thermostat Calibration

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FULL SIZE ELECTRIC CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS

d.Rotate the knob to the lowest temperature setting then back to 350°F.

e.Repeat the average temperature calculation in step 7.

NOTE: Allow the oven to cycle at least two times between adjustments before performing the calculation.

a)If the average temperature still differs more than 10 °F from the dial setting, adjust the thermostat calibration until the average temperature is within tolerance.

C.If the above adjustment cannot be obtained:

1)Turn the power switch OFF.

WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AT THE MAIN CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT BOX INDICATING THE CIRCUIT IS BEING SERVICED.

2)Replace the temperature control and check calibration.

MECHANICAL (KX)

THERMOSTAT CALIBRATION

1.Place a thermocouple in the geometric center of the oven cavity.

2.Set the power switch to ON.

3.Set the thermostat dial to 350 °F.

4.Allow the oven temperature to stabilize (normally 3 cycles).

5.Record the temperature when the thermostat cycles OFF and ON for at least three complete cycles.

6.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￿(lamp off) ￿340￿(lamp on) ￿20￿

A.The differential calculated should be less than 30￿F.

1)If the differential is 30 °F or less, the thermostat is functioning properly.

a. Proceed to step 7.

2)If the differential is more than 30 ￿F, the thermostat is malfunctioning.

a.Install a replacement thermostat and check calibration.

7.Calculate the average temperature by adding the temperature indicated when the heat lamp goes out to the temperature indicated when the heat lamp comes on and dividing this answer by 2.

[Temp. (lamp off) ￿Temp. (lamp on)] ÷ 2 ￿Average Temp.

Example: 360￿￿340￿÷ 2 ￿350￿

A.If the average temperature is 15 ￿F or less from the dial setting, the thermostat is properly calibrated.

B.If the average temperature is more than 15 ￿F 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 (¼ turn = 35￿F).

8.Replace the knob and verify the setting is still at 350°F.

9.Repeat step 7 until the average temperature is within tolerance.

NOTE: Allow the oven to cycle at least two times between adjustments before performing the calculation.

F25105 (December 2001)

 

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Contents VC4E & VC6E Series VC4ED ShownTable of Contents Full Size Electric Convection Ovens General Specifications VC4ES VC4ED VC4ECVC6ES VC6ED VC6EC Removal and Replacement of Parts Covers and PanelsRemovable Components Control Panel ComponentsLeft Side Panel Covers and PanelsTemperature Probe Solid State Control Component Panel ComponentsFront Access Heating ElementsAlternate Access Blower and MotorLeft Side Elements Shown Door Switch Service Procedures and AdjustmentsDoor Window Oven Doors and Bearings Independent DoorsAssembly Removal Oven Doors Simultaneous DoorsAssembly Removal Door Catch Roller Assembly Independent DoorsDisassembly Mechanical KX ThermostatInterior Lights Lamp AssemblyHigh Limit Thermostat LampCooling FAN Service Procedures and Adjustments Solid State Temperature Control CalibrationMechanical KX Thermostat Calibration Solid State Temperature Control Test TroubleshootingTemperature Probe Test Solid State Control Temp F Ohms Amps PER Voltage KW PER Element Ohms PER Lead208 240 480 Blower Adjustment Door Adjustment Door Catch Roller Adjustment Independent DoorsDoor Switch Adjustment ProcedureIntroduction Setup mode Computer ControlOperation Probe Test Alternating onMenu Display Parameter Data Solid State Relay TestComputer Control Temperature Calibration Computer Control Operational TestCaly HEYKEY Code Restore Factory Settings SSR1 & SSR2 Electrical OperationComponent Function 1CON & 2CONMechanical Temperature Control Component LocationFull Size Electric Convection Ovens Electrical Operation Full Size Electric Convection Ovens Electrical Operation VC4EC/6EC Plug, Socket and Components Cook & Hold Standard Cook Cycle VC4ED, VC6ED with Solid State Temperature ControlSequence of Operation VC4ES, VC6ES with Mechanical KX ThermostatTimer Cycle, Cooking KX Thermostat or Solid State Control Cool Down Cycle KX Thermostat or Solid State ControlVC4EC, VC6EC Computer Control Temperature and Time Cycle Cooking Cook and Hold CycleCool Down Cycle Schematics VC4ES, VC6ES with Mechanical KX ControlsVC4ES, VC6ES with Mechanical KX Controls VC4ED, VC6ED with Solid State Temperature Control VC4ED, VC6ED with Solid State Temperature Control Full Size Electric Convection Ovens Electrical Operation VC4EC, VC6EC Computer Control, 480V Roast & Hold Standard This page Purposely Left Blank Wiring Diagrams VC4ES, VC6ES with Mechanical KX ControlFull Size Electric Convection Ovens Electrical Operation VC4ES, VC6ES with Mechanical KX Control Full Size Electric Convection Ovens Electrical Operation VC4ED, VC6ED with Solid State Temperature Control Full Size Electric Convection Ovens Electrical Operation VC4ED, VC6ED with Solid State Temperature Control Full Size Electric Convection Ovens Electrical Operation Full Size Electric Convection Ovens Electrical Operation Full Size Electric Convection Ovens Electrical Operation VC4EC, VC6EC Computer Control, 480V Roast & Hold Standard Full Size Electric Convection Ovens Electrical Operation Troubleshooting Full Size Electric Convection Ovens TroubleshootingALL Models Computer Control Models only Control Operational TestError Codes Code & Problem Probable Cause SolutionComputer Control T E S Condensed Spare Parts List Part Number Description VC4ES VC4ED VC4EC VC6ES VC6ED VC6EC
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