Vulcan-hart VC4ED Manuel d'utilisateur télécharger pdf (Page 18)

FULL SIZE ELECTRIC CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS

F25105 (December 2001) Page 18 of 60

Differential Heat lamp OFF Heat lamp ON

Example

: 360 (

lamp off

) 340 (

lamp on

) 20

[

Temp

lamp off

)

Temp

lamp on

)] ÷ 2

Average Temp

Example

: 360 340 ÷ 2 350

d. Rotate the knob to the lowest

temperature setting then back to

350°F.

e. Repeat the average temperature

calculation in step 7.

NOTE:

Allow the oven to cycle

at least two times between

adjustments before performing

the calculation.

a) If the average temperature

still differs more

than 10 °F

from the dial setting, adjust

the thermostat calibration

until the average

temperature is within

tolerance.

C. If the above adjustment cannot be

obtained:

1) 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.

2) Replace the temperature control and

check calibration.

MECHANICAL (KX)

THERMOSTAT CALIBRATION

1. Place a thermocouple in the geometric center

of the oven cavity.

2. Set the power switch to ON.

3. Set the thermostat dial to 350 °F.

4. Allow the oven temperature to stabilize

(normally 3 cycles).

5. Record the temperature when the thermostat

cycles OFF and ON for at least three complete

cycles.

6. Calculate the differential by subtracting the

temperature indicated when heat lamp goes out

from temperature indicated when heat lamp

comes on.

A. The differential calculated should be less

than 30 F.

1) If the differential is 30 °F or less

, the

thermostat is functioning properly.

a. Proceed to step 7.

2) If the differential is more

than 30 F,

the thermostat is malfunctioning.

a. Install a replacement thermostat

and check calibration.

7. Calculate the average temperature by adding

the temperature indicated when the heat lamp

goes out to the temperature indicated when the

heat lamp comes on and dividing this answer

by 2.

A. If the average temperature is 15 F or less

from the dial setting, the thermostat is

properly calibrated.

B. If the average temperature is more

than

15 F of the dial setting, the thermostat

calibration must

be adjusted.

1) Remove the thermostat knob.

2) Hold the thermostat shaft and turn the

inner set screw clockwise

to decrease

temperature or counterclockwise

increase temperature (¼ turn =

35 F).

8. Replace the knob and verify the setting is still

at 350°F.

9. Repeat step 7 until the average temperature is

within tolerance.

NOTE:

Allow the oven to cycle at least two times

between adjustments before performing the

calculation.

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Vulcan-hart VC4ED Manuel d'utilisateur Page 18

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