Lincoln 1454-000-E Manuel D’Utilisation

Impinger I -–Adv Digital – Electric Service Manual - International

24VAC at transformer secondary. If there is primary

voltage, but no secondary voltage, replace control

transformer.

Oven control

Check for 24VAC supply to oven control. If no voltage is

present, trace wiring back to control transformer. Check

for supply voltage to oven control. If no voltage is

present, trace wiring back to hi-limit thermostat. If

voltage is present, check for a read-out on the display. If

there is no read-out on the display, replace oven control.

If there is a read-out on the display, set the oven control

to maximum temperature (see installation operations

manual for temperature adjustment). With the oven

control at maximum temperature, check for supply

voltage to the heat contactor. If there is voltage at the

heat contactor, proceed to “Heat contactor “. If there is

no voltage at the heat contactor, trace wiring back to the

oven control. If there is no voltage output at the oven

control, check the read-out on the oven control. If the

oven control reads “PROBE FAIL” this indicates that the

thermocouple has failed or become disconnected from

the oven control

Contactor, hi-limit (Model

1421-000-E only)

Check for supply voltage to contactor coil. If no voltage

is present, trace wiring back to oven cavity hi-limit

thermostat. If supply voltage is present at the coil, check

to see that contacts are closed. If there is voltage to the

coil and the contacts are not closed, replace contactor.

Thermocouple

Check to see that the thermocouple is securely

connected to the oven control. If the thermocouple is

connected to the oven control, and the display indicates

“PROBE FAIL”, disconnect the thermocouple from the

oven control and measure the resistance of the

thermocouple. The thermocouple should read approx.
11

Ω. If these readings are not achieved, replace the

thermocouple. If these readings are correct, proceed.

Oven control

If the thermocouple checks good, but the oven control

display indicates that there is a thermocouple failure,

replace the oven control. If the oven control indicates a

temperature reading, but the oven will not heat, proceed.

Thermocouple

WITH POWER ON AND THERMOCOUPLE

ATTACHED TO THE OVEN CONTROL: Measure the

DC millivolt output of the thermocouple. Refer to the

thermocouple chart (located in the “Removal” section of

the manual) for proper millivolt readings. If these

readings are not achieved, replace thermocouple.

Oven control

If the thermocouple checks good, but there is no supply

voltage output to the temperature regulation valve,

replace the oven control. If there is supply voltage output

to the heat contactor, proceed.

Heat contactor

Check for supply voltage to the heat contactor. If voltage

is present, listen for contacts to open and close. Also

check for opens or shorts in the operating coil. Replace

heat contactor as needed.

Intermittent heating

Thermal/overload of main fan

motor

The main fan motor is equipped with internal thermal

protection and will cease to operate if overheating

occurs. As the motor overheats and cool, this will cause

the heating system to cycle on and off intermittently.

Improper ventilation or lack of preventive maintenance

may cause this problem. Also most of the problems

listed under “Oven will not heat” can cause intermittent

failure.

Conveyor will not run

Incoming power supply

Check circuit breaker, reset if required. Check power