Lincoln Impinger Conveyor Ovens 1100 Series - Manual (Page 27)

Cooling Fans 120 VAC should now be at these fan
motors. If voltage is present,
check motors for shorts or opens.
WITH POWER OFF: Check for locked rotor.
Cooling fans continue Cooling Fan Thermostat Thermostat is normally open and may to run after
20 minute have closed if control box temperature cool down
is 120°F or above.
Oven will not heat Gas Supply Check for adequate gas supply and
manual gas shut off valve is open.
Also, check flexible gas line connection.
Main Fan If not operating, refer to “Oven Fan
Will Not Run” on Page C6.
Fuse 3 Amp Check, replace if necessary.
Fuseholder Check, replace if necessary.
Relay Oven Start Supply voltage should be present
across these terminals.
Burner Switch Check for supply voltage on both sides of
switch. If switch is closed and voltage
present on one side only, replace switch.
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:
Proper gas pressure supply to gas valve as
marked on the oven specification plate.
Check for proper adjustment of gas
pressure switch 8.8 on dial for
natural gas, 23 for LP, and
4.5 for Town Gas.
Check gas filter in gas valve for
blockage or damage. (See Adjustment
section for location)
If above checks are okay, but pressure
switch is still not closed, replace gas
valve.
Air Pressure Check air switch terminals for supply voltage
Switch at NO 2 and COM. If voltage is present on one
side only, check for air tube blockage or
misalignment. If these are okay, adjust
switch or replace necessary.
(Oven Cavity) High Limit Terminals are normally closed, Thermostat
opens at 660°F (350°C). If
open, push in reset button and retest.
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 check okay, replace hi-limit
thermostat.
Ignition Control Check for proper supply voltage
to ignition control.
Impinger II - 1100 Series Service Manual - International 27