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
less
than 30°F, the
thermostat is functioning properly.
a.
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
less
than 15°F
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 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.
Fig. 53
SOLID STATE TEMPERATURE
CONTROL TEST (VC4GD/6GD)
Certain procedures in
this section require electrical test or
measurements while power is applied
to the machine. Exercise extreme
caution at all times and follow Arc Flash
procedures. If test points are not easily
accessible, disconnect power and
follow Lockout/Tagout procedures,
attach test equipment and reapply
power to test.
1.
NOTE:
If right side panel is not accessible, this
component can be serviced by removing CONTROL
PANEL.
2.
Place a thermocouple in the geometric center of
the oven cavity.
NOTE:
Oven temperature must be below 450°F.
VC4G & VC6G SERIES FULL SIZE CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS
F24682 Rev. D (1016)
Page 26 of 75
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