Vulcan-hart VC4ED Manuel d'utilisateur télécharger pdf (Page 19)

FULL SIZE ELECTRIC CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS

F25105 (December 2001)Page 19 of 60

A. After the final adjustment is made and the

average temperature is within tolerance,

remove the knob and apply a non-

permanent type sealer around the head of

the set screw.

10. If the above adjustment cannot be obtained:

A. 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.

B. Install a replacement thermostat and

check calibration.

SOLID STATE TEMPERATURE

CONTROL TEST

1. Remove the right side panel as outlined under

"COVERS AND PANELS" in "REMOVAL AND

REPLACEMENT OF PARTS".

NOTE:

If right side panel is not accessible, this

component can be serviced by removing the control

panel as outlined under "COVERS AND PANELS".

2. Place a thermocouple in the geometric center

of the oven cavity.

NOTE:

Oven temperature must

be below 450°.

3. Set the temperature control to the maximum

setting.

4. Check machine data plate for correct voltage to

oven. Refer to diagram below for proper

terminal locations and voltages before

checking the control. Use the correct terminals

for the corresponding voltage.

5. Turn the power switch to ON.

6. Check for proper voltage across terminals 8 &

10 (208-240VAC) for power to the control.

A. If correct, proceed to step 7.

B. If incorrect, problem is not

with the

temperature control. See

"TROUBLESHOOTING".

7. Check relay voltages on the board:

A. For 208-240VAC controls - check across

terminals 7 & 10 for input to the internal

relay and 6 & 10 for output from the

internal relay.

1) If input voltage to the internal relay is

correct, proceed to step 8. If input

voltage to the internal relay is not

present, problem is not with the

temperature control. See

"TROUBLESHOOTING".

2) If output voltage from the internal

relay is correct proceed to step 8. If

output voltage from the internal relay

is not

correct, check temperature

probe as outlined under

"TEMPERATURE PROBE TEST

(SOLID STATE CONTROL)".

8. Set the temperature control to the minimum

setting.

NOTE:

Oven temperature must

be above 300°F.

9. Check for zero (0) volts AC across terminals 6

& 10 (208-240VAC) for no output from the

internal relay.

A. If correct, temperature control is

functioning properly.

B. If incorrect, check temperature probe as

outlined under "TEMPERATURE PROBE

TEST (SOLID STATE CONTROL)".

1) If temperature probe is ok:

a. 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.

b. Replace the temperature control

and check calibration as outlined

under "SOLID STATE

TEMPERATURE CONTROL

CALIBRATION".

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