Vulcan-hart VC4ED Manuel d'utilisateur télécharger pdf (Page 20)

FULL SIZE ELECTRIC CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS

F25105 (December 2001) Page 20 of 60

TEMPERATURE PROBE TEST

(SOLID STATE CONTROL)

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.

NOTE:

The temperature probe used in conjunction

with the Solid State Temperature control is an RTD

(resistance temperature detector) of the Thermistor

type. As temperature increases the resistance value

decreases.

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 shielded thermocouple in the geometric

center of the oven cavity and determine the

temperature in the oven cavity.

3. Remove the probe lead wires from the solid

state temperature control.

4. Test the probe with an ohmmeter.

A. If the measured resistance values are

inside the given tolerance then the probe

is functioning properly.

B. If the measured resistance values are

outside the given tolerance then replace

the probe and retest.

1) Check oven for proper operation.

5. Reverse procedure to install.

TEMP (°F) OHMS* TEMP (°F) OHMS*

77 90,000 360 822

240 4,077 380 656

260 3,016 400 529

280 2,266 425 424

300 1,726 450 334

320 1,332 475 266

340 1,041

(*) Resistance in ohms ± 10%

HEATING ELEMENT TEST

WARNING:

THE FOLLOWING STEPS REQUIRE

POWER TO BE APPLIED TO THE UNIT DURING

THE TEST. USE EXTREME CAUTION AT ALL

TIMES.

1. Turn the power switch ON and set the oven

temperature control to the highest setting.

2. Measure the voltage at the heating element

terminals and verify it against the data plate

voltage.

A. If voltage is incorrect

, find the source of

the problem.

B. If voltage is correct

, check current draw

(amps) through the heating element lead

wires.

NOTE:

This method is preferred over a

resistance check when a clamp on type amp

meter is available.

1) If current draw is correct then heating

element is functioning properly.

See

table below for proper values.

2) If current draw is not

correct, turn the

power switch OFF and

disconnect

the electrical supply to the oven.

a. Replace heating element then

proceed to step 3.

C. If unable to check current draw, a

resistance check may

indicate a

malfunctioning element.

1) Turn the power switch OFF and

disconnect the electrical supply to

the oven.

2) Remove the lead wires from the

heating element and check resistance

(ohms).

See table below for proper

values.

3. Check for proper operation.

VOLTAGE

KW PER

ELEMENT

AMPS PER

ELEMENT

LEAD

OHMS PER

ELEMENT

1 PH 3 PH

208

2603521

240

2523328

480

2 15 4 111

NOTES:

1. Values in the table are nominal.

Tolerance is +5/-10%.

2. Voltage values are @ 60HZ.

3. Resistance values (ohms) are @

room temperature.

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 59 60

Commentaires sur ces manuels

Pas de commentaire

Vulcan-hart VC4ED Manuel d'utilisateur Page 20

Commentaires sur ces manuels

Produits connexes et manuels pour Fours à convection Vulcan-hart VC4ED