Lincoln Impinger Conveyor Ovens 1633-000-EA - Manual (Page 8)

Low Profile –1600 Series Advantage Digital Service Manual – Int’l 8
Igniter/sensor assembly Check this assembly for visible damage. Replace as
needed. If there is no visible damage, check for
voltage supply to igniter/sensor assembly. If there is
voltage supplied to the igniter/sensor, but there is no
spark, replace the igniter/sensor assembly.
Gas valve Gas valve should open as the ignition control
generates the high voltage spark. Place a manometer
on the pressure tap fitting (located in the gas piping
just prior to the burner manifold) and check for gas
pressure. If valve does not open, check reset button
on ignition control, and all connections for tightness. If
there is still no gas pressure, remove the ignition
control from the gas valve. Check the coils of the gas
valve for opens or shorts. Readings should be as
follows: V1 – 2.9K ohms approx., V2 – 1.3K ohms
approx. If these readings are not achieved, replace
gas valve. If these readings are achieved, replace
ignition control.
Flame will not
stay on Flame sensor To check for flame sensor operation, connect a digital
multimeter (capable of measuring D.C. microamps)
between the flame sensor wire and the flame sensor
connection on the ignition control. Sensor current is to
be 0.9 microamps, minimum. If these readings are not
achieved, replace the igniter/sensor assembly. Also
check for any type of damage to the flame sensor wire
and connections.
NOTE: The D.C. microamp test must be conducted
with the oven in low flame (bypass) operation
Power supply Set the temperature to the lowest temperature setting.
If there is sufficient microamp current, but the flame
will not stay lit, check for proper polarity of the power
supply.
Ignition control If there is sufficient microamp current, and there is
proper polarity of the power supply, but the burner will
not stay lit, check the reset button for the ignition
control. If the above test is okay, replace ignition
control.
NOTE: Flame should be on at
this time
Low flame is on,
But no main flame Control transformer Check for supply voltage to the primary of the control
transformer. If no voltage is present, trace wiring back
to the oven power relay. If primary voltage is present,
check for 24VAC at the transformer secondary. If
there is primary voltage, but no secondary voltage,
replace control transformer.