Lincoln Impinger 1450, Service Manual

Page: 15 / 44

Impinger I – 1400 Series Advantage Service Manual – Dom & Int’l 15
Gas Pressure Switch This switch is located inside the gas valve and should
close when gas pressure is present. WITH POWER
OFF: remove 3 prong plug (on gas valve) and
measure continuity between terminals 2 and 3.NOTE:
Remove insulation pad below plug to read numbers. If
no continuity, check the following:
1. Proper gas pressure supply to the gas valve as
marked on the oven specification plate.
2. Check for proper adjustment of gas pressure
switch. 8.8 on dial for natural gas, 23 for LP, and 4.5
for Town Gas.
3. Check gas filter in gas valve for blockage or
damage. (See Adjustment Section on page 28). If
above checks are okay, but pressure switch is still not
closed, replace gas valve.
Hi-Limit Thermostat Thermostat is normally closed, opens at 368°C
(695°F). If open, reset and test oven for proper
operation. If thermostat will not hold for maximum
oven temperature, and oven is not exceeding
temperature dial setting, check for proper location of
capillary bulb in its spring holder. If above checks
okay, replace hi-limit thermostat.
Ignition Control Check for proper line voltage supply to ignition control,
terminal #1.Check for proper line voltage to the Burner
Blower Motor. If voltage is present, proceed with next
step, if not, wait 30 seconds, push reset button, and
try to restart. If this fails, check wires from thermostat
and burner blower motor to the ignition control. If all
above fails and wires are okay, replace ignition
control.
Burner Blower Motor Check for line voltage to motor. WITH POWER OFF:
turn blower wheel to check for locked rotor or blower
wheel slippage. If proper line voltage is present at
motor connecting plug, terminal 2 and 5, and motor
does not run, replace motor.
Air Pressure Switch (Burner
Blower) Check for proper line voltage switching from "N.C." to
"N.O." as air pressure switch closes. Check for air
switch adjustment, air tube blockage, or misalignment,
and if these fail, replace air pressure switch.
Spark Generator A pre-purge time of 30 to 60 seconds occurs after
blower motor starts, check for proper line voltage at
spark generator. If voltage is not present, check reset
button for the Ignition Control. If voltage is still not
present, replace ignition control. If voltage is present,
visually check for spark at igniter head located in end
of burner.
Igniter/Sensor Assembly Check this assembly for visible damage. If there is no
damage, replace the spark generator. If there is
damage, replace the Igniter/Sensor Assembly. Also
check for frayed or damaged wires in the burner tube.
Check spark gap (should be .100 inch 2.5 mm).
Replace as needed.
Gas valve This solenoid is located inside the gas valve and
should open when proper line voltage is present. If no
voltage is present, check the reset button on the
ignition control, and all connections for tightness. If
there is still no voltage present at gas valve, replace
ignition control. If there is voltage present, check for
gas pressure at the gas pressure tap located in the
gas piping just prior to the burner. If there is no gas
pressure, replace gas valve.