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A. If the control differential is less than 20°F,
the temperature control circuit is functioning
properly. Proceed to step 7.
B. If the control differential is more than 20°F,
check the temperature probe as outlined
under Temperature Probe Test.
C. If the control differential is more than 20°F
and the probe passes the test parameters,
then temperature controller is
malfunctioning. Install a new temperature
controller and run calibration steps again.
7. Calculate the average oven temperature by
adding the actual minimum temperature to the
actual maximum temperature and dividing by 2.
EXAMPLE:
Oven set to 350°F.
Actual minimum oven temperature = 335°F
Control turns on at 334°F
Actual maximum oven temperature = 347°F
Control turns off at 340°F
335 + 347 = 682
682/ 2 = 341 (the control is 9°F out of calibration)
340 - 334 = 6°F Control Differential
347 - 335 = 12°F Oven Temperature Differential.
A. If the average oven temperature is within +/-
5°F from the dial setting, no calibration is
necessary.
B. If the average oven temperature is not within
+/- 5°F, calibration is recommended.
8. Loosen the set screw on the temperature
controller and carefully remove the knob from the
shaft, without rotating the shaft. This will expose
the calibration adjustment control access hole in
the front panel.
Fig. 25
9. Monitor the internal oven temperature and
determine at what temperature the control should
turn on to give you the required minimum
temperature (Example: 350-341=9; 334+9=341.
341°F is the temperature at which you would wish
the controller to turn on).
10. After allowing the oven to operate through
several cycles (minimum 3 cycles), monitor the
temperature as it falls to the desired turn on point.
Using a small screw driver, adjust the calibration
adjustment until the controller turns on at the
desired turn on temperature.
11. The calibration control is adjusted clockwise in
order to increase the set temperature and
counter clockwise to decrease the set
temperature.
12. The controller has only +/- 25°F of adjustment.
1/4 turn of the calibration adjustment represents
approximately 20°F shift in calibration.
VC3ED FULL SIZE ELECTRIC CONVECTION OVEN - SERVICE PROCEDURES AND ADJUSTMENTS
F45534 (0415) Page 16 of 31