Lincoln Impringer 1400 Series User manual

1450DomExptSvc REV: 9/25/08
SERVICE MANUAL
(DOMESTIC AND INTERNATIONAL)
IMPINGER CONVEYOR OVENS
MODEL 1400 SERIES ADVANTAGE
Lincoln Foodservice Products, LLC
1111 North Hadley Road
Fort Wayne, Indiana 46804
United States of America
Phone : [phone]
U.S. Fax: [phone] • Int’l Fax: [phone]
Technical Service Hot Line
[phone]
www.lincolnfp.com

Impinger I – 1400 Series Advantage Service Manual - Dom & Int’l
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TABLE OF CONTENTS
TABLE OF CONTENTS..........................................................................................................................................................2
SEQUENCE OF OPERATION................................................................................................................................................4
MODEL 1450 / 120 VAC / 60 HZ / NATURAL GAS ........................................................................................................4
MODEL 1451 / 120 VAC / 60 HZ / LP GAS.....................................................................................................................4
MODEL 1480 / 120 VAC / 60 HZ / TOWN GAS..............................................................................................................4
SEQUENCE OF OPERATIONS .............................................................................................................................................4
MODEL 1452 120/208 VAC 3 PHASE 60 HZ................................................................................................................4
MODEL 1453 120/240 VAC 3 PHASE 60 HZ................................................................................................................4
SEQUENCE OF OPERATIONS .............................................................................................................................................5
MODEL 1454 / 380/220 VAC / 50 HZ / 3 PHASE ...........................................................................................................5
MODEL 1455 / 415/240 VAC / 50 HZ / 3 PHASE ...........................................................................................................5
SEQUENCE OF OPERATIONS .............................................................................................................................................6
MODEL 1456 / 220-240 VAC / 50 HZ / NATURAL GAS.................................................................................................6
MODEL 1457 / 220-240 VAC / 50 HZ / L.P. GAS ...........................................................................................................6
MODEL 1474 / 220-240 VAC / 50 HZ / NATURAL GAS.................................................................................................6
MODEL 1475 / 220-240 VAC / 50 HZ / L.P. GAS ...........................................................................................................6
MODEL 1476 / 220-240 VAC / 50 HZ / TOWN GAS.......................................................................................................6
SCHEMATIC 1450 / 1451 / 1480............................................................................................................................................7
SCHEMATIC 1452 / 1453.......................................................................................................................................................8
SCHEMATIC 1454 / 1455.......................................................................................................................................................9
SCHEMATIC 1456 / 1457.....................................................................................................................................................10
SCHEMATIC 1474 / 1475 / 1476..........................................................................................................................................11
TROUBLESHOOTING GUIDE..............................................................................................................................................12
GAS OVENS..................................................................................................................................................................12
TROUBLESHOOTING GUIDE..............................................................................................................................................19
ELECTRIC OVENS........................................................................................................................................................19
REMOVAL INSTALLATION & ADJUSTMENTS..................................................................................................................22
CONVEYOR CONTROL BOARD ASSEMBLY - REPLACEMENT...............................................................................28
GENERAL – 1450 SERIES...................................................................................................................................................30
GENERAL - 1450 SERIES BLOW-UP..................................................................................................................................31
CONTROL BOX – 1450, 1451, 1480....................................................................................................................................32
CONTROL BOX – 1450, 1451, 1480 BLOW-UP..................................................................................................................33
CONTROL BOX – 1452, 1453..............................................................................................................................................34
CONTROL BOX – 1452, 1453 BLOW-UP............................................................................................................................35
CONTOL BOX – 1454, 1455.................................................................................................................................................36
CONTROL BOX – 1454, 1455 BLOW-UP............................................................................................................................37
CONTROL BOX – 1456, 1457, 1474, 1475, 1476................................................................................................................38
CONTROL BOX – 1456, 1457, 1474, 1475, 1476 BLOW-UP..............................................................................................39
OVEN BACK, GAS – ELECTRIC..........................................................................................................................................40
OVEN BACK, GAS – ELECTRIC BLOW-UP........................................................................................................................41
CONVEYOR – 1450 SERIES ...............................................................................................................................................42
CONVEYOR 1450 SERIES BLOW-UP ................................................................................................................................43

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SEQUENCE OF OPERATION
MODEL 1450 / 120 VAC / 60 HZ / NATURAL GAS
MODEL 1451 / 120 VAC / 60 HZ / LP GAS
MODEL 1480 / 120 VAC / 60 HZ / TOWN GAS
POWER SUPPLY Electrical power is supplied to the oven by a three-conductor cordset. Voltage from the
black conductor to white conductor is 120 VAC. The white conductor is neutral. The green
conductor is ground.
CONTROL BOX When the temperature in the control box reaches 120°F±3°
AUTO COOL DOWN (48.9°C±1.7°C), the cooling fan thermostat will switch power to the control box-cooling fan.
The thermostat will interrupt power to the fan when the control box temperature falls to
100°F±3°(37.0°C±1.7°C).
MAIN FAN CIRCUIT Electrical power is permanently supplied to the normally open contacts of the double pole
main fan relay, the cooling fan thermostat and the normally open switch. Closing the on/off
switch energizes the coil of the relay through the 3A fuse. The normally open contacts now
close, energizing the main fan motor through the 10A fuse, and the control box-cooling fan.
Closing the on/off switch also supplies 120 VAC to the burner blower motor, the conveyor
control board and to the normally open centrifugal switch of the main fan motor.
BURNER CIRCUIT Closing the on/off switch supplies 120 VAC to the burner blower motor and the normally
open centrifugal switch of the main fan motor. As the fan motor reaches approximately
(900 RPM) the centrifugal switch closes supplying120 VAC to the electronic temperature
control board and the primary of the burner control transformer. The transformer secondary
supplies 24 VAC through the normally open centrifugal switch (inside the burner blower
motor, this switch closes at approximately 1600 RPM) to the burner control. The igniter
circuit is now energized.
IGNITION CONTROL When the burner control is supplied with 24 VAC, the pilot valve and spark igniter is
energized. Ignition should now occur, after the pilot flame is proven, the main gas valve is
energized.
TEMPERATURE
CONTROL When the centrifugal switch of the main fan motor closes, 120 VAC is applied to the temperature controller. The temperature dial is adjusted to the desired temperature. The
thermocouple will provide varying millivolts to the temperature controller. The temperature
controller supplies 120 VAC to the solenoid valve (and the yellow cycling lamp on the front
panel) at intermittent intervals to maintain desired temperatures.
CONVEYOR DRIVE Closing the on/off switch supplies 120 VAC to the conveyor control board. AC volts are
converted to DC volts and are supplied to the conveyor motor at terminals A+ and A-
Adjustment of the speed control potentiometer will change resistance at terminals P1 & P2,
varying the DC voltage to the motor. The speed of the conveyor motor will increase or
decrease as the DC voltage from the board increases or decreases respectively.
NOTE: The conveyor control uses a sensor and magnet, mounted on the conveyor motor
that senses the motor speed. Any change in motor load (± RPM) is detected by the sensor
and the voltage to the motor is adjusted accordingly.
SEQUENCE OF OPERATIONS
MODEL 1452 120/208 VAC 3 PHASE 60 HZ
MODEL 1453 120/240 VAC 3 PHASE 60 HZ
POWER SUPPLY Electrical power is to be supplied to the oven by a 5-conductor service.
Black conductor is hot.
Red conductor is hot.
Orange conductor is hot.
White conductor is dedicated neutral.
Green conductor is ground.
CONTROL BOX AUTO
COOL DOWN When the temperature in the control box reaches 120°F ± 3°, (49°C ± 1.7°C), the cooling fan thermostat will switch power to the cooling fan. The thermostat will interrupt power to
the cooling fan when the temperature falls to 100°F±3° (37°C ± 1.7°C).
MAIN FAN CIRCUIT Electrical power is permanently supplied through 6, 50A fuses to the normally open
contacts of the mercury contactors. Power is also supplied through 1, 10A fuse to the
normally open contacts of the main fan relay, to the normally open cooling fan thermostat,
and through a 3A fuse to the normally open single pole main fan switch. Closing the main
fan switch supplies 120 VAC to the coil of the main fan relay. The coil of the relay is

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energized, the normally open contacts close, energizing the main fan motor and cooling
fan. Closing the main fan switch also supplies power to the conveyor control and the
centrifugal switch of the main fan motor.
HEAT CIRCUIT Closing the on/off switch supplies 120 VAC to the normally open centrifugal switch (inside
the main fan motor). As the motor reaches approximately (900 RPM) the centrifugal switch
closes supplying 120 VAC through the normally closed oven cavity and control box hi-limit
thermostats, to the electronic temperature control board
TEMPERATURE
CONTROL When the centrifugal switch (inside the main fan motor) closes, 120 VAC is applied to the temperature controller. The temperature dial is adjusted to the desired temperature. The
thermocouple will provide varying millivolts to the temperature controller. The temperature
controller supplies 120 VAC to the contactor coils at intermittent intervals (closing the
contactors and supplying 208 or 240 VAC to the heating elements) to maintain desired
temperature. The ready lamp is energized with the contactors.
CONVEYOR DRIVE Closing the on/off switch supplies 120 VAC to the motor control board. AC volts are
converted to DC volts and are supplied to the conveyor motor at terminals A+ and A-.
Adjustment of the speed control potentiometer will change resistance at terminals P1 & P2
varying the DC voltage to the motor. The speed of the conveyor motor will increase or
decrease as the DC voltage from the board increases or decreases respectively.
NOTE: The conveyor control uses a sensor and magnet, mounted on the conveyor motor
that senses the motor speed. Any change in motor load (± RPM) is detected by the sensor
and the voltage to the motor is adjusted accordingly.
SEQUENCE OF OPERATIONS
MODEL 1454 / 380/220 VAC / 50 HZ / 3 PHASE
MODEL 1455 / 415/240 VAC / 50 HZ / 3 PHASE
POWER SUPPLY Electrical power is to be supplied to the oven by a 5-conductor service.
Black conductor is hot.
Red conductor is hot.
Orange conductor is hot.
White conductor is dedicated neutral.
Green conductor is ground
CONTROL BOX AUTO
COOL DOWN When the temperature in the control box reaches 120°F ± 3°, (49°C ± 1.7°C), the cooling fan thermostat will switch power to the cooling fan. The thermostat will interrupt power to
the cooling fan when the temperature falls to 100°F ± 3° (37°C ± 1.7°C).
MAIN FAN CIRCUIT Electrical power is permanently supplied through three 50A fuses to the normally open
contacts of the mercury contactor. Power is also supplied through 1, 10A fuse to the
normally open contacts of the main fan relay, to the normally open cooling fan thermostat,
through a 3A fuse to the normally open single pole main fan switch. Closing the main fan
switch supplies 220/240 VAC to the primary of the control circuit step down transformer.
(The transformer steps the voltage down to 120 VAC for the control circuit.) 120 VAC is
supplied to the coil of the main fan relay. The coil of the relay is energized, the normally
open contact close, energizing the main fan motor and cooling fan. Closing the main fan
switch also supplies power to heat and conveyor control.
HEAT CIRCUIT Upon closure of the on/off switch 120 VAC is supplied through the air pressure switch,
through the normally closed oven cavity and control box hi-limit thermostats to the
electronic temperature control.
TEMPERATURE
CONTROL When 120 VAC is supplied to the temperature controller and the temperature dial is adjusted to the desired temperature, the thermocouple will provide varying millivolts to the
temperature controller. The temperature controller supplies 120 VAC to the contactor coil
at intermittent intervals, (closing the contactor and supplying 220 or 240 VAC to the heating
elements) to maintain desired temperature.
CONVEYOR DRIVE Closing the on/off switch supplies 120 VAC to the conveyor control board. AC volts are
converted to DC volts and are supplied to the conveyor motor at terminals A+ and A-.
Adjustment of the speed control potentiometer will change resistance at terminals P1 & P2
varying the DC voltage to the motor. The speed of the conveyor motor will increase or
decrease as the DC voltage from the board increases or decreases respectively.
NOTE: The conveyor control uses a sensor and magnet, mounted on the conveyor motor
that senses the motor speed. Any change in motor load (± RPM) is detected by the sensor
and the voltage to the motor is adjusted accordingly.

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SEQUENCE OF OPERATIONS
MODEL 1456 / 220-240 VAC / 50 HZ / NATURAL GAS
MODEL 1457 / 220-240 VAC / 50 HZ / L.P. GAS
MODEL 1474 / 220-240 VAC / 50 HZ / NATURAL GAS
MODEL 1475 / 220-240 VAC / 50 HZ / L.P. GAS
MODEL 1476 / 220-240 VAC / 50 HZ / TOWN GAS
POWER SUPPLY Electrical power is to be supplied to the oven by a three-conductor service.
Brown conductor is hot.
Blue conductor is neutral.
Green conductor is ground.
CONTROL BOX AUTO
COOL DOWN When the temperature in the control box reaches 120°F ± 3° (48.9°C ± 1.7°C), the cooling fan thermostat will switch power to the control box cooling fan. The thermostat will interrupt
power to the cooling fan when the control box temperature falls to 100°F ± 3° (37.0°C ±
1.7° C).
MAIN FAN CIRCUIT Electrical power is permanently supplied to the normally open contacts of the double pole
main fan relay, the cooling fan thermostat and, through a 3A fuse to the normally open
double pole main fan switch. Closing the oven fan switch supplies line voltage to the
primary of the control circuit step down transformer. The transformer steps the voltage
down to 120 VAC for the control circuit. 120 VAC is supplied to the coil of the double pole
main fan relay. The coil of the relay is energized. The normally open contacts now close,
energizing the main fan motor through one 10A fuse, and the cooling fan motor.
BURNER CIRCUIT Closing the oven fan switch supplies line voltage through the main fan air pressure switch,
through the gas pressure proving switch, through the normally closed Hi-Limit Thermostat,
to the ignition control. The combustion motor is now energized The normally open
combustion air switch closes upon sensing air. After a pre-purge period of between 30 and
60 seconds, the spark generator and the main gas valve are energized. Ignition should
now occur, after proving, gas control relay is energized.
TEMPERATURE
CONTROL Closing the oven power switch supplies 120 VAC (through the step-down transformer) to the temperature control board. The temperature dial is adjusted to desires temperature.
The thermocouple will provide varying millivolts to the temperature controller. The
temperature controller supplies120 VAC through contact of gas control relay to the
solenoid valve at intervals to maintain desired temperature. The ready lamp is energized
with the solenoid valve (an electronic flame monitor proves main flame operation in the
1474, 1475, 1476 models.)
CONVEYOR DRIVE Closing the on/off switch supplies 120 VAC (through the step down transformer) to the
conveyor control board. AC volts are converted to DC volts and are supplied to the
conveyor motor at terminals A+ and A-. Adjustment of the speed control potentiometer will
change resistance at terminals P1 & P2 varying the DC voltage to the motor. The speed of
the conveyor motor will increase or decrease as the DC voltage from the board increases
or decreases respectively.
NOTE: The conveyor control uses a sensor and magnet, mounted on the conveyor motor
that senses the motor speed. Any change in motor load (± RPM) is detected by the sensor
and the voltage to the motor is adjusted accordingly.

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SCHEMATIC 1450 / 1451 / 1480

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SCHEMATIC 1452 / 1453

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SCHEMATIC 1454 / 1455

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SCHEMATIC 1456 / 1457

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SCHEMATIC 1474 / 1475 / 1476

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TROUBLESHOOTING GUIDE
GAS OVENS
IMPINGER ADVANTAGE SERIES
SYMPTOM POSSIBLE CAUSE EVALUATION
Incoming Power Supply Check breakers, reset if required. Call Power Co. if
needed
(Export Ovens) For some export ovens, there is a control circuit step-
down transformer. This transformer steps down
supply voltage to 120 VAC. If main fan will not run,
the secondary of this transformer must be checked
for 120 VAC output. Check specific oven model
schematic for circuit location.
Oven Fan Fuse Check and/or Replace
Control Fuse Check and/or Replace
Fuse Holder Check and/or Replace
Fan Switch Check continuity between switch terminals
Main Relay Check continuity to 120 VAC coil. Check for power to
relay coil (120VAC). Check for supply voltage to
relay contacts. Visually check for contact pull-in.
Fan Motor Check for opens, shorts, or ground. WITH POWER
OFF: Turn Fan Blade to check for locked rotor.
Oven fan will not run
NOTE:
Capacitor Check for opens, shorts, or grounds.
No control box
cooling Main Fan Relay Check for power to main fan relay. Visually check for contact pull-in. Axial Cooling Fan. Check for power
(120 VAC or 240 VAC, check specific model) to
cooling fan. If voltage is present at the fan motor and
the fan does not run, replace fan assembly.
Incoming Power Supply Check breakers/Reset if needed. Check for incoming
power at cooling fan thermostat.
Cooling Fan Thermostat Check cooling fan thermostat (thermostat closes at
120°F and opens at 100°F). With cooling fan
thermostat pre-heated, check for continuity. If switch
is open, replace.
No automatic control
box cooling
Axial Cooling Fan WITH POWER OFF: check for locked rotor. Check
for proper voltage to the cooling fan, if present and
fan does not run, replace the fan.
Control box cooling
fan continues to run Cooling Fan Thermostat See "Cooling Fan Thermostat" (NOTE: Thermostat will remain closed if control box temperature
exceeds 120°F)
Oven will not heat
Model 1450-1451 Gas Supply Check for adequate gas supply to oven
Manual Gas Shut-off Valve Check to see that manual shut-off valve is openMain Oven Fan Check if main oven fan is operating. If not, refer to
"Oven fan will not run" on page 11.
Centrifugal Switch Check for 120 VAC on both sides of (Main Fan)
switch. If voltage present on one side only, and motor
is running, replace motor.
Transformer, 24 VAC Check for 120 VAC to primary of transformer. Check
for 24 VAC from secondary of transformer. If there is
primary voltage, but no secondary voltage, replace
transformer.
For 1456, 1457,
1475, 1476 See
Page 14.
Burner Blower Motor Check for 120 VAC supply to burner blower motor. If
120 VAC is present and motor does not run, replace
motor. WITH POWER OFF: turn blower wheel to
check for locked rotor.

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Centrifugal Switch of Burner
Blower Motor Check for 24 VAC output from secondary of transformer. If voltage is present, check for 24 VAC
at pin 6 and ground on ignition control. If the burner
blower motor is running and there is no voltage at pin
6 and the ground on the ignition control, replace the
burner blower motor.
Ignition Control Check for 24 VAC supply to the ignition control at pin
6 and the ground. If voltage is present, check for 24
VAC across pin #3 and ground (pilot valve). NOTE:
The Honeywell ignition control has a 30 sec. pre-
purge (Time Delay) built in. If voltage is not present,
replace electronic control package. If the pilot valve
is energized, check to see that the high voltage
igniter circuit is also energized. To check, disconnect
the igniter lead from the ignition control. Place female
terminal of igniter lead approximately 1/8" from
terminal post on ignition control. Spark should jump
the 1/8" gap. If no spark is present, replace ignition
control. NOTE: control will try for ignition for 15
seconds only.
No Pilot If the ignition control is supplied with 24 VAC and the
pilot valve (internal to valve assembly) and igniter
circuits are energized, visually check for pilot flame.
This may be done by opening the small inspection
door on the end of the burner, or by opening the
main oven door and looking under the lower finger
housings on the right side of the oven. If no pilot
flame is visible, check pilot shut-off valve.
Pilot Shut-off Valve Check to see that pilot shut-off valve is open (shut-off
valve is located between valve assembly and
burner).
Pilot Tube Check for gas pressure at pilot tube. Disconnect pilot
tube at burner and connect manometer to pilot tube.
If no gas pressure is present, check for blockage in
pilot tube or pilot shut-off valve. If these are clear,
and there is gas supplied to the oven, replace the
gas valve.
Pilot Orifice If there is gas pressure at the pilot tube, check the
pilot orifice for obstructions. Replace as needed.
Burner Igniter Check the burner igniter head for any obstructions,
also check for frayed or broken wire, (spark gap .100
in. 2.5 mm). If there is visible damage, replace igniter
assembly.
Ignition Control If there is a pilot flame, check for 24 VAC across
terminals #1 and the ground (main valve). If there is
no voltage present, replace the ignition control.
NOTE: The Honeywell ignition control has a 15-sec.
lockout built in. If pilot flame is not proven, turn off
switch, wait 30 sec. and restart. If power is supplied
to terminal #1 but there is no main flame, verify that
the main valve (internal to valve assembly) has
opened. Connect a manometer to the manifold gas
pressure tap located on the back of the valve
assembly. If no gas is present, replace valve
assembly. Check for temperature control set above
300°F.
Main Orifice Check for blockage of main orifice. If there is no
blockage to the main orifice, check the temperature
control.
Pilot flame but no
main flame
Temperature Control
(Electronic) Check for 120 VAC across L1 and L2 on temperature control board.

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Thermocouple Probe Remove thermocouple leads from the temperature
control board, and measure the millivolt output of
these leads. Refer to charts on page 25 in the
adjustment section for proper readings.
Temperature Control Turn temperature control dial to full "on" position.
NOTE: Thermocouple must be connected. Measure
for 120 VAC across terminals "N.O." and Com., if
voltage is not present; replace control.
Solenoid Valve If voltage is present at terminals "N.O." and Com.,
check for voltage at solenoid valve. If voltage is
present, listen for valve to open and close. Also,
check for opens and shorts in coil. If solenoid valve is
defective, replace.
Intermittent Heating AS FOLLOWS Both the main fan motor and burner blower motor are
equipped with thermo-protection and will cease to
operate when not cooled properly. This can cause
the units to cycle on and off intermittently. Also, most
of the problems listed under "oven will not heat" can
cause intermittent failures.
For continuing intermittent problems, a series of test lights may be made and installed in the ovens. The lights will allow the
customer to advise the service technician a trouble code when the oven fails
The lights should be connected in the following manner:
Light#1 attached in 120 VAC line after oven fan switch.
Light #2 attached after 120 VAC contacts of oven motor centrifugal switch
Light #3 in 24 VAC Burner Transformer Secondary.
Light #4 in 24 VAC at terminal #6 of Ignition control valve.
Light #5 in 24 VAC at terminal #3 of Ignition control valve.
Light #6 in 24 VAC at terminal #1 of Ignition control valve.
CODE:
All lights off - lights of main power, main fan off, oven fan switch out.
1 on 2 off 3 off 4 off 5 off 6 off - Oven Motor Centrifugal Switch open
1 on 2 on 3 on 4 off 5 off 6 off - Burner Motor Centrifugal Switch bad.
1 on 2 on 3 on 4 on 5 0ff 6 off - Ignition Control bad
1 on 2 on 3 on 4 on 5 on 6 off - Pilot Shield missing or warped, no flame rectification, Pilot
- Orifice plugged, or Gas Control Valve bad.
1 on 2 on 3 on 4 on 5 on 6 on - Unit still not working Main Orifice plugged, Gas Valve bad,
- Temperature Control bad.
-However, Main Orifice would not be intermittent problem.
Voltage Supply Check incoming voltage supply at line 1 to neutral.
There should be a voltage reading of 120 VAC. If not
present, check breakers.
3 Amp Fuse This control fuse is located on the front panel.
Replace if defective.
Fuseholder Check and/or replace.
Fan Switch See procedure for checking on page 11.
Conveyor will not run
Speed Adjustment
Potentiometer This is a 0 to 10 K ohm, 1 turn potentiometer. With power off, remove the black and white pot leads from
the motor control board at terminals P1, P2. Place the
meter leads on the black lead (P2) and on the white
lead (P1). Rotating the pot., slowly, from low to high,
the meter reading should show an even transition
from 0 to 10K ohms ± 5%. There should be no dead or
open spots through out the 1 turn of the pot. Check
both leads to ground. There should be no continuity to
ground. If any of the above checks fail, replace the
pot.

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DC Motor Control Board Check for 120 VAC input to the control board at
terminals L1 and L2. If not present, check the oven
fan switch and wiring back to 3 amp fuse and then
back to power source if necessary. If 120 VAC is
present at L1 and L2, check both fuses on control
board (4A line) and (1A armature), check the VDC
output at terminals A+ and A-. If 120 VAC is present
at terminals L1 and L2, and DC voltage is present A+
and A-, but motor does not run, check gear motor as
follows.
Conveyor Gear Motor If DC voltage is present at A+ and A-and the motor
does not run, first check the mini breaker and then the
conveyor. Refer to the next possible cause. Check the
leads to the motor for evidence of any shorts or
opens, and each lead to ground. If the motor fails the
above tests, replace motor. From the top of the motor,
rotate motor shaft to determine if there is a locked
rotor or a locked gear box (use care so magnet and
the H.S. board are not damaged). Replace as needed.
Conveyor Check for any mechanical mis-alignment . Also check
for worn bearings. A conveyor belt that is over
tightened may cause excessive bearing wear and
sometimes, irregular speed.
Power Supply Check power supply at the DC control board for the
120 VAC at board terminals L1 and L2
D.C. Motor Control Board Place the test meter probes on terminals A+ and A- .
(With speed potentiometer set to maximum speed (
Approx. 2 min.) The meter reading should be
approximately 100 VDC (±3%). The board output is
steady. If the board voltage output is unsteady beyond
limits (±3%) then the board is probably bad. Always
check the speed pot. , be sure it is okay before
changing a board. This test is not always 100%
accurate as this test is not performed at operating
speeds. However, this test is the best method
currently available.
Conveyor speed
varying or intermittent
DC Gearmotor If the DC control board is steady then the problem
may be the motor or gearbox. Check the brushes in
the motor for excessive arching and/or unusual wear.
Check the motor and gearbox from instruction located
on page 14 under "possible cause" Listing "conveyor
gear motor."
Magnet Check to insure that the magnet (cemented to shaft of
conveyor drive motor) has not been damaged, or
come loose from motor shaft. Replace as needed.
Hall Effect Sensor Check for any physical damage to Hall Effect Sensor
(mounted on conveyor drive motor Check all wiring
and connections for damage. Check all connections
for tightness or proper location and check all wiring for
visible damage. Replace as needed. Connect new
Hall Effect to system and check for steady operation.
MODELS 1456 - 1457-1474-1475-1476
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 Check to see that the fan switch is on.
Main Oven Fan Check if main oven fan is operating. If not, refer to
"Oven fan will not run."
Oven will not heat
Air Pressure Switch Check for supply voltage on both sides of switch. If
voltage present on one side only, check for air tube
blockage or misalignment, adjust air switch. Replace
as needed.

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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.

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16
Flame Sensor To check for flame sensor operation, connect a digital
multimeter (capable of measuring D.C. micro amps)
between the flame sensor wire and Ignition Control.
Sensor current from sensor control is 3 micro amps
minimum. If these readings are not achieved replace
igniter/sensor assembly. 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. If all above are okay, replace
ignition control.
No Pilot Pilot Orifice If all above are operating properly, but there is no pilot
flame, check for any obstructions in pilot orifice.
Flame Sensor (There should be a visible pilot flame at this time.) To
check for flame sensor operation, connect a digital
multimeter (capable of measuring D.C. micro
amperes) between the flame sensor wire and the
ignition control. NOTE: this is a current measurement
and the meter must be connected in series. Proper
current readings should be minimum of 3 micro AMP.
D.C. If these readings are not achieved, replace
igniter/sensor assembly. Also check for any type of
damage to flame sensor wire and connections.
Power Supply If there is sufficient micro-amp current, but the flame
will not stay lit, check for proper polarity of the input
power supply.
Pilot flame, but burner
will not stay ignited
Ignition Control If there is sufficient flame sensor current, but the
burner will not remain ignited, check reset button on
ignition control, if all above are okay, replace ignition
control.
Gas Control Relay Check for 220 VAC to relay coil. If no voltage is
present, trace wiring back to ignition control. If voltage
is present, check to insure contacts are closing.
Temperature Control Check for 120 VAC across L1 and L2 on temperature
control board. If no voltage is present, retrace wiring
back to power supply. Turn the temperature
adjustment knob to the maximum temperature
position and check for 120 VAC at the load terminal to
neutral. If 120 VAC is not present, proceed as
follows: If 120 VAC is present and unit is not heating,
see "Solenoid Valve."
Thermocouple Probe Remove thermocouple leads from the temperature
control board and measure the millivolt output of these
leads. Refer to chart in page 25 for proper readings.
If the thermocouple probe checks good, then the
problem is usually with the temperature control board.
Indicator light is on,
but no main
flame(Model 1456-
1457)
Solenoid Valve If output voltage is present at temperature control
board, check for voltage at solenoid valve. If voltage
is present, listen for valve to open and close. Also
check for opens, shorts in coil. Replace as needed.
Indicator light is on,
but no main flame
(1474-1475-1476)
Temperature Control Check for 120 VAC across L1 and L2 on temperature
control board. If no voltage is present, retrace wiring
back to power supply. Turn the temperature
adjustment knob to the maximum temperature
position and check for 220 VAC at the load terminal
to neutral. If 220 VAC is not present, proceed as
follows: If 220 VAC is present, and unit is not heating,
see "Flame Monitor". Check for 220 VAC at terminal
"COM" on temperature control board. If no voltage is
present, trace wiring back to ignition control.

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Thermocouple Probe Remove thermocouple leads from the temperature
control board and measure the millivolt output of these
leads. Refer to chart on Page 25 for proper readings.
If the thermocouple probe checks good, replace
temperature control.
Flame Monitor Check for 220 VAC at terminal #1. If no voltage is
present, trace wiring back to temperature control.
Check for 220 VAC output at terminal #8. NOTE:
There is a delay of up to 2 seconds for 220 VAC
output at terminal #8. If there is no voltage output at
terminal #8, check the reset button. Replace control
as needed.
Relay, Main Burner Check for 220 VAC at relay coil, if no voltage is
present, trace wiring back to flame monitor. Check for
120 VAC to relay contacts. If no voltage is present,
trace wiring back to power supply. Check to ensure
contacts are closing
Valve, Temperature
Regulation Replace relay as needed. Check for 120 VAC at valve, if no voltage is present, trace wiring back to
relay. If voltage is present, listen for valve to open and
close. Check for opens or shorts in coil. Replace as
needed.
Main Flame will not
stay lit Flame Monitor (There should be a visible main flame at this time.) To check for flame monitor operation, connect a digital
voltmeter (capable of measuring D.C. microamperes)
between the flame sensor and terminal #15 on the
flame monitor. The flame monitor requires a minimum
of 4 micro amp. D.C. for proof of flame. If these
readings are not achieved, replace sensor assembly.
Also check for any type of damage to flame sensor
wire and connections. If the reading is above the
minimum required, and the flame monitor will not
supply 220 VAC to the relay coil, replace the flame
monitor.
Intermittent heating As Follows Both the main fan motor and burner blower motor are
equipped with thermal protection and will cease to
operate if overheating occurs. This can cause the
units to cycle on and off intermittently. This may be
caused by improper ventilation. Also most of the
problems listed under "oven will not heat" can cause
intermittent failure. See page 13 for test lights.

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TROUBLESHOOTING GUIDE
ELECTRIC OVENS
IMPINGER ADVANTAGE SERIES
SYMPTOM POSSIBLE CAUSE EVALUATION
Incoming Power Supply Check breakers/Reset if required. Call Power Co. if
needed.
Oven Fan Fuse Check and/or Replace
Fuse Holder Check and/or Replace
Fan Switch
1454-1455
Check continuity between switch terminals.
For these oven models, there is a control circuit step-
down transformer. This transformer steps down
supply voltage to 120 VAC. If main fan will not run, the
secondary of this transformer must be checked for
120 VAC output. Check specific oven model
schematic for circuit location.
Main Relay Check continuity to 120 VAC coil. Check for power to
the relay coil,(120 VAC). Check for 120/208/220/240
VAC to relay terminals. Visually check for contact pull-
in.
Fan Motor Check for opens, shorts, or ground. WITH POWER
OFF: Turn Fan Blade to check for locked rotor.
Oven fan will not run
Capacitor Check for opens, shorts, or grounds.
Main Fan Relay Check for power to main fan relay. Visually check for
contact pull-in.
No control box
cooling Axial Cooling Fan WITH POWER OFF: turn fan blade to check for
locked rotor. Check for power to cooling fan. If voltage
is present at the fan motor and the fan does not run,
replace fan assembly.
Incoming Power Supply Check circuit breakers, reset if required, call Power
Company if needed.
No automatic control
box cooling Cooling Fan Thermostat Thermostat is normally open and closes at 120°F ± 3
(48.9°C ± 7°), and opens at 100°F ± 3°F (37.8°C ±
1.7°C).
Main Oven Fan Check if main oven fan is operating. If not, refer to
"Oven fan will not run". Page 18.
Centrifugal Switch (Main Fan)
Model 1452-1453 Check for 120 VAC on both sides of switch. If voltage is present on one side only and motor is running,
replace motor.
Oven will not heat
Air Pressure Switch
(1454-1455) This normally open switch should close when the main fan is activated. If adjustment is necessary
(Refer to page 28). Check tube for blockage. Replace
if defective.
Hi Limit Thermostat (Oven
Cavity) 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, replace
thermostat.
Control Box High Limit
Thermostat Terminals are normally closed, but open at 130°F ± 5°F (53.9°C ± 2.8°C). Check for over heating and
reset thermostat. Test for proper operation. If it will not
reset and hold, then replace.

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Temperature Control Board Check for 120 VAC input to temperature control
board. If not present, check wiring from Hi-Limit to
temperature control board. Turn the temperature
adjustment dial to the maximum temperature position.
Check for 120 VAC at coil of mercury contactor(s).
Next, short the leads of thermocouple on the
temperature control board, check for 120 VAC at coil
of mercury contactor(s). If voltage is not present,
replace temperature control board. If voltage is
present, proceed.
Thermocouple Probe Remove thermocouple leads from the temperature
control board, and measure the millivolt output of the
leads. Refer to chart (page 25) in adjustment section
for proper millivolt readings.
Mercury Contactor(s) Check for 120 VAC to the contactor coil. If voltage is
present and contactor will not activate, replace the
contactor(s). Also check each contactor for proper
high voltage input and output.
50 Amp Fuses If there is no high voltage input to the mercury
contactor(s), check the 50 amp fuses and replace if
necessary.
Heater Elements Check the Amp. draw on each hot leg for proper load.
Check the specification plate for rating information. If
the Amp. draw is low or high, check the individual
elements for opens, shorts, and proper resistance. To
check resistance of the elements, turn off the power!
Remove all leads from the elements and use an
accurate digital VOM. The element resistance should
be as follows: 208V - 9.8 ohms approx. 220V - 10.5
ohms approx. 240V - 13 ohms approx. If all readings
are not correct, replace elements as needed.
Oven heats with
switch off Mercury Contactor(s) The mercury contactor has probably malfunctioned in the closed position. If there is no voltage to the
operating coil, but there is high voltage at the
contactor output, replace the mercury contactor.
Voltage Supply (Export Ovens) Check incoming voltage supply, check breakers and
reset if required. For some export ovens there is a
control circuit step down transformer. This transformer
steps down supply voltage to 120 VAC. If conveyor
will not run, the secondary of this transformer must be
checked for 120 VAC output. Check specific oven
model schematic for circuit location.
Speed Adjustment
Potentiometer This is a 0 to 10K ohm, 1 turn potentiometer. With power off, remove the black and white pot leads from
the motor control board at terminals P1 and P2 with a
digital multimeter, check the ohm reading on the black
lead (P2) and the white lead (P1). Rotating the pot,
slowly, from low to high, the meter reading should
show an even transition from 0 to 10K ohms ± 5%.
There should be no dead or open spots through out
the 1 turn of the pot. Check both leads to
ground.There should be no continuity to ground. If any
of the above checks fail, replace the pot.
Conveyor will not run
DC Motor Control Board Check for 120 VAC input to the control board at
terminals L1 and L2.If not present, check back to
power source if necessary. If 120 VAC is present at
L1 and L2, check the VDC output at terminals A+ and
A-. If 120 VAC is present at terminals L1 and L2, but
DC voltage is not present at A+ and A-, verify fuses
are not blown, if fuses check ok, replace the board. If
DC voltage is present at A+ and A-, but motor does
not run, check gear motor as follows:

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Conveyor Gear Motor If DC voltage is present A+ and A- and the motor does
not run, first check the mini breaker and then the
conveyor. Refer to the next possible cause. Check
motor brushes for excessive or abnormal wear,
replace as needed. Check the leads to the motor for
evidence of any shorts or opens, and each lead to
ground. If the motor fails the above tests, replace
motor.
Conveyor Check for any mechanical mis-alignment or improper
adjustment. Also check for worn bearings. The
Installation and Operations Manual shows proper
conveyor belt adjustment. A conveyor belt that is over
tightened will cause excessive bearing wear and
sometimes, irregular speed.
Conveyor speed
varying Power Supply Check power supply at the DC control board for the 120 VAC at board terminals L1 and L2. If voltage is
not present, check main circuit breakers
DC Gearmotor If the DC control board is steady, then the problem
may be the motor or gearbox: Check the brushes in
the motor for excessive arching and/or unusual wear.
Check the motor and gearbox from instruction located
on page 20 under "possible cause" listing "Conveyor
gear motor".
Magnet Check to insure that the magnet cemented to shaft of
conveyor drive motor) has not been damaged, or
come loose from motor shaft. Replace as needed.
Hall Effect Sensor Check for any physical damage to Hall Effect Sensor
(mounted on conveyor stepper drive motor. Check all
wiring and connections for damage. Check all
connections for tightness or proper location and check
all wiring for visible damage. Replace as needed.