Vulcan K20EL User Manual download pdf (Page 14)

SERVICE PROCEDURES AND ADJUSTMENTS

Certain procedures in this section require electrical test or measurements while power is applied

to the machine. Exercise extreme caution at all times. If test points are not easily accessible, disconnect power and

follow lockout / tagout procedures, attach test equipment and reapply power to the test.

TEMPERATURE CONTROLLER

TEST

Fig. 25

1. Place kettle in full upright position. (tilt kettles

only)

2. Set temperature dial to lowest setting. Kettle

must be below 110°F before verifying the

potentiometer output to the controller is good

over the full range of temperature dial travel.

3. Access TEMPERATURE CONTROLLER.

4. Check all lead wires for secure connections to the

controller terminals. Wiring harness lead wires

must be connected to T1-T2 and T3-T4 for proper

input to controller.

5. Re-connect power to the machine.

6. Turn power switch on.

7. Verify temperature controller is receiving

120VAC at terminals T1-T3 and T2-T4 and

machine is properly grounded.

8. Slowly turn temperature dial to the highest setting

and monitor heat light over the full range of travel.

A. Verify heat light (amber) comes on and

heating element is energized.

B. If heat light does not remain on or flashes

momentarily as temperature setting is

slowly increased, verify condition of

potentiometer as outlined under

POTENTIOMETER TEST.

NOTE: Temperature controller will de-energize

internal relay and turn off the output status LED if the

circuitry detects an open thermocouple. LED will begin

to flash 3 times, pause, then repeat the flash sequence

to indicate the open thermocouple condition.

C. If heat light and heating element do not turn

on.

1) Verify condition of thermocouple as

outlined under THERMOCOUPLE

TEST.

2) Verify output from terminal T8 on

controller as outlined in the steps

below.

9. Disconnect lead wire from terminal T7 on the

controller.

A. Verify 120VAC between lead wire from T7

and X1 on the output of main transformer. If

correct, re-connect lead wire to terminal T7

and continue with procedure.

B. If incorrect, check pressure switch (1PS)

and water level controller (WLC LLCO).

10. Verify 120VAC between T8 and X1 on the output

of main transformer. If correct, output from

controller is functioning properly.

A. If incorrect, install a replacement

temperature controller and check for proper

operation.

Electric Stationary and Tilting Kettles - SERVICE PROCEDURES AND ADJUSTMENTS

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Vulcan K20EL User Manual Page 14

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