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FULL SIZE GAS CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS
F32700 (February 2006) Page 18 of 64
SERVICE PROCEDURES AND ADJUSTMENTS
WARNING: CERTAIN PROCEDURES IN THIS SECTION REQUIRE ELECTRICAL TEST OR MEASUREMENTS
WHILE POWER IS APPLIED TO THE MACHINE. EXERCISE EXTREME CAUTION AT ALL TIMES. IF TEST
POINTS ARE NOT EASILY ACCESSIBLE, DISCONNECT POWER AND FOLLOW LOCKOUT/TAGOUT
PROCEDURES, ATTACH TEST EQUIPMENT AND REAPPLY POWER TO TEST.
SOLID STATE TEMPERATURE
CONTROL CALIBRATION
(WKGD/WKGDX)
1. Place a thermocouple in the geometric center of
the oven cavity.
2. Set the ON-OFF-OVEN COOL switch to ON.
3. Set the temperature control dial to 350°F.
4. Allow the oven temperature to stabilize
(normally 3 cycles).
5. Record the temperature at which the Heat lamp
goes OFF and comes ON for at least two
complete heating cycles.
6. Calculate the differential by subtracting the
temperature indicated when the lamp goes out
from the temperature indicated when the lamp
comes on.
A. The differential calculated should be less
than 20 °F.
1) If the differential is less than 20 °F, the
temperature control circuit is
functioning properly.
a. Proceed to step 7.
2) If the differential is more than 20 °F:
a. Check the temperature probe as
outlined under TEMPERATURE
PROBE TEST
(WKGD/WKGDX).
b. If the probe is functioning
properly then temperature control
is malfunctioning.
a) Install a replacement
temperature control and
check calibration.
7. Calculate the average temperature by adding
the temperature indicated when the lamp goes
out to the temperature indicated when the lamp
comes on and dividing this answer by 2.
A. If the average temperature is less than
10 °F from the dial setting, the thermostat
is properly calibrated.
B. If the average temperature is more than
10 °F from the dial setting, the thermostat
calibration must be adjusted.
1) Loosen the temperature control knob
set screw and remove the knob from
the stem.
2) Loosen temperature control mounting
screws only enough to rotate the
control.
a. Place thumb and forefinger on
the head of the mounting screws,
apply pressure and slightly rotate
the screw heads (body of control)
in the slot. Rotate clockwise to
increase temperature and
counterclockwise to decrease.
b. Center the stem in the opening
and re-tighten the temperature
control mounting screws.
c. Replace knob and re-tighten set
screw .
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, replace the temperature control
and check calibration.