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FULL SIZE GAS CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS
F24682 (Rev. B, October 2007) Page 20 of 68
MECHANICAL THERMOSTAT
CALIBRATION (VC4GS/6GS)
1. Place a thermocouple in the geometric center of
the oven cavity.
2. Set the ON-OFF-COOL DOWN 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.
A. The differential calculated should be less
than 30EF.
1) If the differential is less than 30° F, the
thermostat is functioning properly.
a. Proceed to step 7.
2) If the differential is more than 30EF,
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.
A. If the average temperature is less than
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 the
average temperature is within tolerance.
NOTE: Allow the oven to cycle at least two times
between adjustments before performing the
calculation.
9. If the above adjustment can not be obtained,
install a replacement thermostat and check
calibration.
SOLID STATE TEMPERATURE
CONTROL TEST (VC4GD/6GD)
1. Remove the right side panel as outlined under
COVERS AND PANELS in REMOVAL AND
REPLACEMENT OF PARTS.
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. Place a thermocouple in the geometric center of
the oven cavity.
NOTE: Oven temperature must be below 450°.
NOTE: If oven is equipped with the Roast and Hold
option, turn it to Normal ROAST (normal cooking)
before continuing.
3. Set the temperature control to the maximum
setting.