Lincoln Impinger II - Advantage Series - Manual (Page 9)

Impinger II –Advantage Service Manual - Domestic 9
Burner Blower Motor Visually check to see if motor is running. If not,
check for 120 VAC to motor at motor connector (wire
#5 and #22). If voltage is not present, trace wiring
back to fan switch. If voltage is present and motor is
not running, check for opens, shorts, or grounds.
Also, WITH POWER OFF: check for locked rotor.
Transformer, Burner Primary is 120 VAC with 24 VAC secondary. If 120
VAC is not present, trace wiring back to Main Fan
Centrifugal Switch. If 120 VAC is present, check for
24 VAC at secondary of transformer. If no voltage is
present, replace transformer.
Centrifugal Switch of Burner
Blower Motor Check of 120 VAC at motor connector, on wire #13
to neutral. If voltage is not present, trace wiring back
to transformer. If voltage is not present and motor is
running, replace the burner blower motor.
Ignition Control 24 volts should be present at 24 volt terminals. If not
present, trace wiring back to centrifugal switch.
When 24 VAC is supplied, the control switches 120
VAC from L1 and L2 to the hot surface ignitor. if 120
VAC is not present at L1 and L2, trace wiring
back to fan switch. If 24 VAC and 120 VAC are
present and 120 VAC is not across the hot surface
ignitor terminals, replace the ignition control.
Hot Surface Ignitor If 120 VAC is present at hot surface ignitor terminals,
visually check to see that the ignitor is heating.
(Ignitor may be viewed through the port glass in end
of burner tube.) The ignitor should glow bright red.
If the ignitor does not heat, replace the ignitor.
Ignition Control After 45 seconds of hot surface ignitor pre-heat, the
ignition control will switch 24 VAC to the gas control
valves. Check for 24 VAC output from ignition
control, across terminals marked "valve" and "valve
ground". If no voltage is present, replace ignition
control.
Gas Control Valves When 24 VAC is supplied to the gas control valve,
the valve should open. Check for gas pressure at
the manifold tap located just before the burner. If
there is no pressure, check the incoming gas supply
to be sure all manual valves are open and flexible
gas hose is properly connected. If gas is present
and coils of gas valve are energized, the gas valve is
probably defective.
Flame will not stay lit Hot Surface Ignitor Six seconds after the gas valve opens, ignition must
occur. if flame is not detected, the ignition control
will shut off and lock out. To reset the ignition
control, turn off the burner switch for 45 seconds,
then turn on the burner switch to retry ignition. The
ignition control requires a minimum of 0.8 D.C.
microamps. To check flame sensing operation,
connect a digital multimeter (capable of measuring
D.C. micro-amps) between the "ground" terminal on
ignition control and the ground lead.
NOTE: This is a current measurement and the
meter must be connected in series. If these
readings are not achieved, replace the hot surface
ignitor.
NOTE: The D.C. micro amp test must be conducted
with the oven in low flame (bypass) operation. Turn
the temperature control to the lowest setting.