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FULL SIZE ELECTRIC CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS
F25105 (December 2001) Page 26 of 60
A. If voltage is correct, SSR is functioning
properly.
B. If no voltage is present on the load side of
SSR terminal 2, the SSR is not
functioning
properly.
7. Turn the power switch OFF.
WARNING:
DISCONNECT THE ELECTRICAL
POWER TO THE MACHINE AT THE MAIN
CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT
BOX INDICATING THE CIRCUIT IS BEING
SERVICED.
8. Replace the SSR and check for proper
operation.
COMPUTER CONTROL
TEMPERATURE CALIBRATION
1. Place a thermocouple in the geometric center
of the oven cavity.
2. Turn the power switch ON.
A. If the set point temperature is 350°F,
proceed to step 4.
B. If the set point temperature is other than
350°F, proceed to step 3 to change the
temperature.
3. Press the set key then temperature key to enter
the temperature set mode.
A. The display will alternate between the term
"StPt" (set point) and the current oven
temperature setting.
B. Press the up or down arrow keys to make
the proper selection.
C. Press the set key again to save the
change and exit the temperature set
mode.
4. Allow the oven temperature to stabilize
(normally 3 cycles).
5. Compare the controls set point temperature to
the thermocouple meter reading when the heat
light goes out.
A. A temperature variance more
than 5°F
indicates an adjustment is needed.
1) To make the adjustment, proceed to
step 6.
2) If temperature variance is less
than
5°F, computer control is functioning
properly.
6. Enter the setup mode as outlined in "SETUP
MODE" under "COMPUTER CONTROL".
A. Advance through the menu until CAL1
(Calibration Offset) appears.
1) If the thermocouple reading is higher
than set point temperature, press the
down arrow key and enter a negative
offset value that is equal to the
number of degrees above the 5°F
tolerance.
2) If the thermocouple reading is lower
than set point temperature, press the
up arrow key and enter a positive
offset value that is equal to the
number of degrees below the 5°F
tolerance.
3) Exit the setup mode.
7. Allow the oven to cycle at least two times
between adjustments.
A. If the temperature variance still differs
more
than 5°F from the set point, verify
the correct calibration offset value was
entered and retained.
1) Adjust the calibration offset value as
outlined in step 6, until the cycling
temperature is within tolerance.
B. If the above adjustment cannot be
obtained:
C. Turn the power switch OFF.
WARNING:
DISCONNECT THE ELECTRICAL
POWER TO THE MACHINE AT THE MAIN
CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT
BOX INDICATING THE CIRCUIT IS BEING
SERVICED.
D. Replace the computer control and check
for proper operation.
COMPUTER CONTROL
OPERATIONAL TEST
The computer controls "Calibration Mode" is used to
manually test:
• Outputs of the control
• Keypad functionality
• Verify display and LEDs functionality
Additionally, if a problem is encountered during the
output test, a "Restore Factory Settings" option is
available.
CAUTION: The calibration mode contains
several adjustable parameters that must not
be
changed. For the "CALY" (Calibration)
Parameter, the default data option selected must
be "no".