Lincoln Impinger II - Advantage Series, Service Manual

Page: 10 / 36

Impinger II – Advantage Service Manual - Domestic 10
Power Supply If there is sufficient micro-amp current, but the flame
will not stay lit, check for proper polarity of the 120
VAC power supply.
Ignition Control If there is sufficient micro-amp current, and the 120
VAC polarity is correct, but the flame will not stay lit,
replace ignition control.
NOTE: Check for proper ground connection on
ignition control.
NOTE: Flame should be lit at
this time.
Low flame is on,
but no main flame Temperature Control Check for 120 VAC at terminal #7
to neutral on temperature control. If no voltage,
trace voltage back through centrifugal switch and hi-
limit. Turn the temperature adjustment knob to
maximum temperature position and check for 120
VAC at the load terminal #8 and neutral. If 120 VAC
is present and unit is not heating, refer to
"Temperature Solenoid Valve" for next check. If 120
VAC is not present, proceed.
Thermocouple Probe 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 in Section D for
proper readings. If these readings are not achieved,
replace the thermocouple.
Temperature Set Disconnect the potentiometer leads
Potentiometer from the board. Place ohm meter test leads on the
blue and green pot leads. Reading should be 1 K
ohms. Place meter leads across the blue and purple
pot leads and rotate knob from high to low. Repeat
on green and purple leads. Check for even rise and
fall of ohms reading to insure that there are no open
or dead spots in the potentiometer. Check each
lead to ground for shorts. Replace pot if it does not
meet the above test.
Temperature Solenoid If 120 VAC is present on the
Valve temperature control board at load terminal #8 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.
Intermittent Heating Thermal/Overload of Main Fan
and Burner Blower Motors The main fan motor and the burner blower motor are
equipped with internal thermal protection and will
cease to operate if over heating occurs. As the
motors overheat and then cool, this will cause the
units to cycle on and off intermittently. This may be
caused by improper ventilation or preventive
maintenance. Also, most of the problems listed
under "Oven will not heat" can cause intermittent
failure.
Conveyor will not run Voltage Supply Check incoming voltage supply at line 1 to neutral.
There should be a voltage reading of 120 VAC. If
not present, check breakers.
10 Amp Fuse Check and/or replace.
Fuseholder Check and/or replace.
Fan Switch See procedure for checking on Page 10.