Lincoln Impringer Conveyor Oven 1200 - Manual (Page 47)

Impinger I -–1000 Series Service Manual - International 47
Incoming Power Supply Check circuit breakers, reset if required. Call the
Power Co. if needed.
Fuse Transformer Check, replace if necessary.
Fuseholder Check, replace if necessary.
Cooling Fan Thermostat Check the cooling fan thermostat (Thermostat
closes at 120°F and opens at 100°F). With the
cooling fan thermostat pre-heated, check for
continuity. If switch is open, replace.
No automatic control
box cooling
Cooling Fan 120 VAC should now be at this motor. If voltage is
present, check motor for shorts, opens, or grounds.
WITH POWER OFF: check for locked rotor.
Cooling fan continues
to run after 20 minute
cool down Cooling Fan Thermostat Thermostat is normally open and may have closed
if control box temperature is 120°F or above.
Gas Supply Check for adequate gas supply to oven.
Manual Gas Shut-off Valve Check to see that manual shut-off valve is open.
Fan Switch Main Oven Fan Check to see that the fan switch is on. Check if
main oven fan is operating. If not, refer to "Oven
fan will not run."
Oven Start Relay Check for contacts to close.
Burner Switch Check for 220 VAC to neutral on both sides of
switch.
Air Pressure Switch Check for 220 VAC on both sides of switch. If
voltage present on one side only, check for air tube
blockage. Adjust air switch. If above fails, replace
air pressure switch.
Gas Pressure Switch Check for 220 VAC to neutral on both sides of
switch. If voltage is present on one side of switch
only, check the following. Check for proper gas
pressure supply to gas valve.(Marked on oven spec
plate). Check for proper adjustment of gas pressure
switch. Should be set at 8.8 for Nat., 23 for L.P.
Check gas filter in gas valve for blockage or
damage. (See Adjustment Section for location). If
the above checks okay, but switch still not closed,
replace gas valve.
Hi-Limit Thermostat Terminals are normally closed. 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 220 VAC supply to ignition control at pin
#1 and neutral. If voltage is not present, retrace
wiring back to hi-limit thermostat. Check for 220
VAC at pin #6 to neutral.(Power to burner motor). If
voltage is present, proceed. If no voltage is
present, wait 30 seconds and check reset button. If
above fails, replace ignition control.
Oven will not heat
Burner Blower Motor Check for 220 VAC supply to burner blower motor.
WITH POWER OFF: turn blower wheel to check for
locked rotor. If 220 VAC is present and motor does
not run, replace motor.
Burner Blower Motor Air
Pressure Switch Check for 220 VAC switching to pin "N.O." as the
air pressure switch closes. For Honeywell ignition
control only, connect a temporary jumper wire (for
testing purposes only) from pin "C" to pin "N.O." on
ignition control (to bypass air switch). Check for air
tube blockage or misalignment, adjust air pressure
switch. If the above fails, replace air pressure
switch.