Lincoln 1100 Series Manuel D’Utilisation

LEADS ATTACHED TO THE TEMPERATURE

CONTROL BOARD: measure D. C. millivolt output of

these leads. Refer to thermocouple chart in SectionD

for proper readings. If these readings

are not achieved, replace thermocouple.

Temperature Control

WITH POWER OFF: remove the

Potentiometer

potentiometer leads from the temperature control

board and measure ohms from black to white leads.

The reading should be from approximately

0 to 2.5k ohms as the dial of the

potentiometer is turned throughout its full rotation.

From black to red leads, the reading should be

approximately 2.5k ohms (constant) throughout the

full rotation of the dial. If these readings are not

achieved, replace potentiometer. If the thermocouple

probe and the control potentiometer check good,

then the problem is usually with the temperature

control board.

Mercury Contactor

Check for 120 VAC to the contactor coil. If voltage is

present and contactor will not activate, replace the

contactor. Also, check each contactor for proper

high voltage input and output.

Heater Elements

Check the Amp. draw on each hot leg for

proper load.Check the specifications plate for rating

information.If the Amp. draw is low or high, check

the individual elements for opens, shorts, and proper

resistance.

WITH POWER OFF: To check resistance of the

elements, remove all leads from the elements and

use an accurate digital VOM. The element resistance

should be as follows:

220V - 30 ohms

approximately

240V - 36 ohms

approximately

Oven heats with switch off

Mercury Contactor

The mercury contactor has probably

malfunctioned in the closed position.

If there is no voltage to the operating

coil, but there is high voltage at the

contactor output, replace the mercury

contactor.

Intermittent Heating

Thermal/Overload

The main fan is equipped with internal

of motort hermal protection and will cease to

operate if overheating occurs. If the

motor overheats and then cools, this will

cause the unit to cycle on and off

intermittently. This may be caused by

improper ventilation or preventative

maintenance. Also, most of the problems

listed under “Oven will not heat” can

cause intermittent failure.

Impinger II - 1100 Series Service Manual - International