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WKG Series Full Size Gas Convection Ovens - SERVICE PROCEDURES AND ADJUSTMENTS
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.
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 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.
F32700 Rev. B (0315)
TEMPERATURE PROBE TEST
NOTE: The temperature probe used in conjunction
with the Solid State Temperature control is an RTD
(resistance temperature detector) of the Thermistor
type. As temperature increases the resistance value
decreases.
1.
Remove the RIGHT SIDE PANEL.
NOTE: If right side panel is not accessible, this
component can be serviced by removing the
CONTROL PANEL.
2.
Place a shielded thermocouple in the geometric
center of the oven cavity and determine the
temperature in the oven cavity.
3.
Remove the probe lead wires from the solid state
temperature control.
Page 26 of 74
Fig. 53
(WKGD/WKGDX)
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
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