Lincoln 1100 Series Service Manual page 20

Flame will not stay lit
Low flame is on, but no
main flame
20
Hot Surface Igniter
Ignition Control
Gas Control Valves
Hot Surface Igniter/ Flame
Sensor
Power Supply
Ignition Control
NOTE: flame should be
present at this time
Temperature Control
If 120 VAC is present at Hot Surface Igniter terminals,
visually check to see that the igniter is heating. (Igniter
may be viewed through the port glass in end of the
burner tube.) The Igniter should glow bright red. If the
igniter does not heat, replace the Igniter.
After 45 seconds of hot surface igniter 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
When 24 VAC is supplied to the gas control valve, the
valves 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 at the oven and
coils of gas valve are energized, the gas valve is
defective. When 24 VAC is supplied to the gas control
valve the red burner indicator.
Six seconds after the gas valve opens, ignition must
occur. If flame is not detected, the ignition control will
shutoff 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, check bypass orifice for obstructions. If
bypass orifice is clear, replace the hot surface
igniter/flame sensor.
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.
If there is sufficient micro-amp current, but the flame will
not stay lit, check for proper polarity of the 120 VAC
power supply.
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.
Check for 120 VAC at terminal #11 to neutral on
temperature control. If no voltage, trace voltage back to
Centrifugal Switch.
Turn the temperature adjustment knob to maximum
temperature position and check for 120 VAC at the load
terminal (#9) 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.
Impinger II –1100 Series Service Manual - Domestic