Computer Control Operational Test - Vulcan-Hart VC4EC Service Manual

FULL SIZE ELECTRIC CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS
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.
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.
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".
Listed below are the parameters and data you
should find in the calibration Mode.
MENU
Calibrate
display no)
Logic Output Test
(see step 3)
Logic Inputs "LI"
(Factory Only)
Keyboard
step 4)
Display Test
segments of
display and the
LED's are tested )
Exit Calibration
Mode and return
to Operation
Mode
NOTE: While in the calibration mode, on all
parameters except the Logic Output Test (LgOt), the
control outputs will be OFF.
• To change the programmed data, use the arrow
keys.
• To select the next parameter, press the Rack 1
key.
• At the end of the test, the control automatically
exits the Calibration Mode and returns to the
Operation Mode.
• After 1 minute of no key activations, the control
will return to operation mode.
5. Use this key sequence to access the calibration
mode.
Up arrow; Down arrow; Rack 1; Down arrow;
Temperature; Rack 1
6. Once in the calibration mode the display will
alternate between the parameter and
programmed data. The computer control
outputs are turned OFF.
A. Convection fan stops.
B. Heating stops.
Page 27 of 60
ALTERNATING ON
DISPLAY
PARAMETER
(must
CALY
LgOt*
*g displays as a 9
LI
(see
HEY
(All
---
Set point temperature is
displayed or if call for heat,
dashes (----) displayed.
F25105 (Rev. A, October 2007)
DATA
no
0
21
0
sequence
of
characters
in display
window