– 24 –
Solid State Relay Test
1. Remove the right side panels as outlined
under Covers and Panels in Removal and
Replacement of Parts.
2. Turn the power switch to the ON position.
3. Check for +5 VDC on input side of SSR-1 in
the normal heating mode (terminals 3 & 4)
and SSR-2 in the roast and hold mode.
A. If +5 VDC is present, continue to step 4.
B. If no voltage is present, computer control
is not functioning properly.
4. Check for 120 VAC at load side of SSR
(terminals 1 & 2).
A. If no voltage is present, solid state relay
is not functioning properly.
1)
Replace the SSR and check for proper
operation.
B. If 120 VAC is present, component is
functioning properly.
5. Reassemble oven and check for proper
operation.
COMPUTER CONTROL CALIBRATION
(SG4C/SG6C)
Calibration Steps
1. Place a thermocouple in the geometric center
of the oven cavity.
2. Set the ON-OFF-COOL DOWN switch to 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 arrows to make
the proper selection.
C. Press the set key again to save the change,
then exit the temperature set mode.
4. Allow the oven temperature to stabilize
(normally three 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 variances is less than
5°F, then the computer control is
functioning properly.
6. Enter the setup mode as outline in Setup
Mode under Computer Control (SG4C/SG6C).
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 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, replace the computer control
and check for proper operation.
Summary of Contents for SG4C ML-114876
Page 2: ...2 VULCAN HART COMPANY 2002...
Page 38: ...38 WIRING DIAGRAMS WIRING DIAGRAM SG4D SG6D OVENS 120 200 V 424372 Rev F...
Page 39: ...39 WIRING DIAGRAM 734 COMPUTER CONTROL DUAL BURNER CONVECTION OVENS 120 200 V 426574 Rev C...
Page 40: ...40 SCHEMATICS GAS CONVECTION OVEN SG4 WITH STD CONTROL 424373 1 REV C...
Page 41: ...41 GAS CONVECTION OVEN SG4 WITH WATLOW 734 CONTROL 426575 1 REV C...
