Vulcan-hart VC4ED Manuel d'utilisateur télécharger pdf (Page 26)

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

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

changed. For the "CALY" (Calibration)

Parameter, the default data option selected must

be "no".

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Vulcan-hart VC4ED Manuel d'utilisateur Page 26

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