Lincoln 1100 Series Service Manual page 21

Intermittent Heating
.
Conveyor will not run REFER TO PAGE 26
From S/N 2011383 and up REFER TO PAGE 29
Conveyor speed varying or intermittent REFER TO PAGE 26
From S/N 2011383 and up REFER TO PAGE 29
Time/Temp Display inoperative REFER TO PAGE 27
From S/N 2011383 and up REFER TO PAGE 29
Temp Display out or erratic REFER TO PAGE 27
From S/N 2011383 and up REFER TO PAGE 29
Impinger II –1100 Series Service Manual - Domestic
Thermocouple Probe
Temperature Control
Potentiometer
Temperature Solenoid
Thermal/Overload of Main
Fan and Burner Blower
Motors
WITH POWER ON AND THERMOCOUPLE LEADS
ATTACHED TO THE TEMPERATURE CONTROL
BOARD: Measure the D. C. millivolt output of these
leads. Refer to thermocouple chart on page 36 for
proper readings. If these readings are not achieved,
replace the thermocouple
WITH POWER OFF: remove the potentiometer leads
from the temperature control board and measure ohms
from black to white leads. The reading should be from
approximately 0 to 2.5 K ohms as the dial of the
potentiometer is turned throughout its full rotation.
From black to red leads, the reading should be
approximately 2.5 K 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.
If 120 VAC is present on the Valve temperature control
board at load terminal (#9) to neutral, check for voltage
at temperature regulation valve. If voltage is present,
listen for valve to open and close. Also check for opens
or shorts in the coil. Replace as necessary.
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