Lincoln Impinger Conveyor Ovens 1633-000-EA - Manual (Page 7)

Low Profile –1600 Series Advantage Digital Service Manual -–Int’l 7
Flame sensor To check for flame sensor operation, connect a digital
multimeter (capable of measuring D.C. micro amps) in
series with the flame sensor wire and ignition control.
Sensor current is 3 micro amps D.C. minimum. NOTE:
The D.C. micro amp test must be conducted with the
oven in low flame (bypass) operation. Turn the
temperature control to its lowest setting. If these
readings are not achieved, replace igniter/sensor
assy. Also, check for any type of damage to flame
sensor wire and connections. Flame will not stay
on
Ignition control If there is sufficient flame sensor current, but the
burner will not remain ignited, check the reset button
on ignition control. NOTE: Check for proper polarity of
the power supply. If all of the above are OK, replace
ignition control.
Oven will not heat
Serial Number
L31479 and above Oven power relay Check for line voltage to the relay coil. If no voltage is
present, trace wiring back to the control box hi-limit
thermostat(s). If voltage is present, check to insure
contacts are closing. Replace relay as needed.
Fuse, burner, 3A Check, replace if necessary.
Fuse holder Check, replace if necessary.
Air pressure switch Check air switch terminals for supply voltage to
terminals C and NO. If voltage is present on one side
only, check for air tube blockage or misalignment. If
these check okay, adjust air pressure switch, or
replace air pressure switch as needed.
Oven cavity hi-limit thermostat Terminals are normally closed, opens at 350˙C (660˙F).
If open, reset and test oven for proper operation. If
thermostat will not hold for maximum oven temperature,
and oven is not exceeding control setting, check for
proper location of capillary bulb in its spring holder. If
above checks are okay, replace hi-limit thermostat.
Ignition control Check for proper supply voltage to ignition control.
Check for proper voltage to the burner blower motor.
This can be checked at motor connecting plug
terminal 5 and Neutral. If voltage is present, proceed
with next test, if not, wait 30 seconds, push reset
button and try to restart. If this fails, check wires from
burner blower motor to the ignition control. If the
above checks okay, replace ignition control.
Burner blower motor Check for supply voltage to motor.
WITH POWER OFF: Turn blower wheel to check for
locked rotor. If supply voltage is present at motor
connecting plug terminal 5 and Neutral, and motor
does not run, replace burner blower motor.
Air pressure switch
(burner motor) Check for proper supply voltage switching from “NC”
to “NO” on the air pressure switch. Check for air
pressure switch adjustment, air tube blockage or
misalignment. If these adjustments fail, replace air
pressure switch.
Ignition control A pre-purge time of 30 to 60 seconds occurs after
burner blower motor starts. Check for high voltage
spark output from the ignition control. If there is no
high voltage spark output, check reset button for
ignition control. If there is still no high voltage output,
replace the ignition control.