Lincoln Impinger II - Advantage Series User manual

1100AdvSvc REV 11/4/08
SERVICE MANUAL
(DOMESTIC)
IMPINGER CONVEYOR OVENS
IMPINGER II - ADVANTAGE SERIES
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 II – Advantage Service Manual - Domestic
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TABLE OF CONTENTS
TABLE OF CONTENTS 2
SEQUENCE OF OPERATIONS 4
SEQUENCE OF OPERATIONS 5
SCHEMATIC 1116-000-A, 1117-000-A 6
SCHEMATIC 1130-000-A / 1131-000-A 7
SCHEMATIC 1132-000-A / 1133-000-A 8
TROUBLESHOOTING GUIDE / GAS OVENS 9
TROUBLESHOOTING GUIDE / ELECTRIC OVENS 14
REMOVAL, INSTALLATION, AND ADJUSTMENT 18
PARTS / GENERAL 26
BLOW UP / GENERAL 27
PARTS / CONTROL BOX 1116-000-A, 1117-000-A 28
BLOW UP / CONTROL BOX – 1116-000-A, 1117-000-A 29
PARTS / CONTROL BOX – 1130-000-A THRU 1133-000-A 30
BLOW UP / CONTROL BOX – 1130-000-A THRU 1133-000-A 31
PARTS / CONVEYOR & DOOR 32
BLOW UP / CONVEYOR & DOOR 33
PARTS / OVEN BACK ASSEMBLY 34
BLOW UP / OVEN BACK ASSEMBLY 35

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SEQUENCE OF OPERATIONS
IMPINGER II ADVANTAGE
MODEL 1116-000-A / NATURAL GAS / 120 VAC / 60 HZ / 1 PHASE
MODEL 1117-000-A / L.P. GAS / 120 VAC / 60 HZ / 1 PHASE
POWER SUPPLY Electrical power is supplied to the oven by a three conductor cordset. Voltage
from the black conductor to the white conductor is 120 VAC. The white
conductor is neutral. The green conductor is ground.
CONTROL BOX AUTO When the temperature in the control box reaches 120°F ± 3° (48.9°C ± 1.7°C),
the
COOL DOWN interrupt power to the fans when the control box temperature falls to 100°F ± 3°
(37.8°C ± 1.7°C).
MAIN FAN CIRCUIT Power is permanently supplied, through a 10A fuse, and through a normally
closed control box hi-limit thermostat, to the normally open main fan switch.
Power is also supplied to the normally open cooling fan thermostat. Closing the
main fan switch supplies 120 VAC to the main fan motor, the cooling fan motor,
the primary of the temperature display transformer, the heat and conveyor
circuits.
BURNER CIRCUIT Closing the main fan switch supplies 120 VAC to the burner blower motor. 120
VAC is also supplied, through the normally closed oven cavity hi-limit thermostat,
the main fan centrifugal switch (this switch closes when main fan reaches
approximately 1600 RPM) to the electronic temperature control and to the
primary of the burner transformer.
IGNITION CONTROL The ignition control operates on both 24 VAC and 120 VAC. When the control is
energized by 24 VAC from the transformer, 120 VAC is switched by the ignition
control to the hot surface ignitor for 45 seconds for the hot surface ignitor warm
up. The ignitor glows red, 24 VAC is switched to the gas valve which opens and
ignition should now occur.
TEMPERATURE CONTROL When the centrifugal switch of the main fan motor closes, power is applied to the
temperature control. The 1K ohm temperature pot is adjusted to desired
temperature. The thermocouple will provide varying millivolts to the temperature
controller. The temperature controller supplies 120 VAC to the solenoid valve at
intermittent intervals to maintain desired temperature. The heat lamp is
energized with the solenoid valve.
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 and 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.
Temperature Display Closing the switch supplies 120 VAC to the primary of the temperature display
transformer. The secondary of this transformer supplies 12 VAC to the temperature
display. The thermocouple supplies D.C. millivolts to the temperature display. The
display converts this millivolt reading to a temperature reading.

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SEQUENCE OF OPERATIONS
1130-000-A / 208V / SINGLE PHASE
1131-000-A / 240V / SINGLE PHASE
1132-000-A / 208V / THREE PHASE
1133-000-A / 240V / THREE PHASE
POWER SUPPLY Electrical power to be supplied to the oven by a three-conductor service on single
phase and a four-conductor service on three phase.
Black conductor is Hot
Red conductor is Hot
Orange conductor is Hot (Used on 3 phase only)
Green conductor is ground.
CONTROL BOX AUTO COOL DOWN When the temperature in the control box reaches 120°F ± 3°F (48.9°F ± 1.7°C),
the cooling fan thermostat will switch power to the cooling fans. The thermostat
will interrupt power to the fans when the temperature falls to 100°F ± 3°F (37°C ±
1.7°C).
MAIN FAN CIRCUIT Power is permanently supplied through the 10A fuses, through the normally
closed control box high limit thermostat, to the normally open main fan switch.
Power is also supplied to the normally open cooling fan thermostat. Closing the
main fan switch supplies 208/240 VAC to the main fan motor, the cooling fan
motor, to the primary of the temperature display transformer and to the heat and
conveyor circuits.
HEATER CIRCUIT Closing the fan switch supplies 208/240 VAC, through the normally open air
pressure switch (closed by air pressure from the main fan) through the normally
closed oven cavity hi-limit thermostat, to the electronic temperature control. The
1K ohm temperature pot is adjusted to desired temperature. The thermocouple
will provide varying millivolts to the temperature controller. The temperature
control then supplies 208/240 VAC to the coil of the contactor at intermittent
intervals to maintain the desired temperature. The heat lamp is energized with
the contactor.
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 and 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.
Temperature Display Closing the switch supplies 120 VAC to the primary of the temperature display
transformer. The secondary of this transformer supplies 12 VAC to the
temperature display. The thermocouple supplies D.C. millivolts to the
temperature display. The display converts this millivolt reading to a temperature
reading.

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SCHEMATIC 1116-000-A, 1117-000-A

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SCHEMATIC 1130-000-A / 1131-000-A

Impinger II –Advantage Service Manual - Domestic 7
SCHEMATIC 1132-000-A / 1133-000-A

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TROUBLESHOOTING GUIDE / GAS OVENS
MODEL 1116-000-A NATURAL GAS 120 VAC 60 HZ 1 PHASE
MODEL 1117-000-A LP GAS 120 VAC 60 HZ 1 PHASE
SYMPTOM POSSIBLE CAUSE EVALUATION
Oven fan will not run Incoming Power Supply Check breakers, reset it required. Check power plug
to be sure it is firmly in receptacle. Measure
incoming power/call power company if needed.
Fuse, 10 Amp Check, replace if necessary.
Fuse Holder Check, replace if necessary.
Hi Limit Thermostat-Control
Box Check for voltage on both sides of the switch. Terminals are normally closed. If open, reset and
test oven for proper operation. If thermostat will not
hold and control box temperature is not exceeding
140°F (60°), replace thermostat.
Main Fan Switch Check continuity between switch terminals.
Main Fan Motor Check for opens, shorts, or grounds. WITH POWER
OFF turn fan blade to check for locked rotor.
Capacitor Check for shorts or grounds.
WARNING: Capacitor has a stored charge,
discharge before testing.
No control box cooling Incoming Power Check main circuit breakers, reset if required, call
power company if needed.
Main Fan Switch Check continuity between switch terminals
Cooling Fan 120 VAC should now be at the fan motor. If voltage
is present, check motors for shorts or opens. WITH
POWER OFF: Check for locked rotor.
No automatic control Incoming Power Supply Check circuit breakers,
box cooling reset if required. Call the power company if needed.
Cooling Fan Thermostat Check the cooling fan thermostat. (Thermostat
closes at 120°F and opens at 100°F). With the
cooling fan thermostat preheated, check for
continuity. If switch is open, replace.
Cooling Fan 120 VAC should be at the motor. If voltage is
present, check motor for shorts, opens, or grounds.
WITH POWER OFF: check for locked rotor.
Oven will not heat Gas Supply Check for adequate gas supply and closed manual
gas shut offs. Also, check flexible gas line
connection.
Main Fan If not operating, refer to "Oven fan will not run".
High Limit Oven Cavity Terminals are normally closed. If
Thermostat 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 checks okay, replace hi-limit
thermostat.
Centrifugal Switch Check for 120 VAC at lead #9
of Main Fan Motor (located at 6 pin connector in raceway near the main
fan motor) to neutral. If no voltage is present, and
motor is running, replace motor.

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Burner Blower Motor Visually check to see if motor is running. If not,
check for 120 VAC to motor at motor connector (wire
#5 and #22). If voltage is not present, trace wiring
back to fan switch. If voltage is present and motor is
not running, check for opens, shorts, or grounds.
Also, WITH POWER OFF: check for locked rotor.
Transformer, Burner Primary is 120 VAC with 24 VAC secondary. If 120
VAC is not present, trace wiring back to Main Fan
Centrifugal Switch. If 120 VAC is present, check for
24 VAC at secondary of transformer. If no voltage is
present, replace transformer.
Centrifugal Switch of Burner
Blower Motor Check of 120 VAC at motor connector, on wire #13 to neutral. If voltage is not present, trace wiring back
to transformer. If voltage is not present and motor is
running, replace the burner blower motor.
Ignition Control 24 volts should be present at 24 volt terminals. If not
present, trace wiring back to centrifugal switch.
When 24 VAC is supplied, the control switches 120
VAC from L1 and L2 to the hot surface ignitor. if 120
VAC is not present at L1 and L2, trace wiring
back to fan switch. If 24 VAC and 120 VAC are
present and 120 VAC is not across the hot surface
ignitor terminals, replace the ignition control.
Hot Surface Ignitor If 120 VAC is present at hot surface ignitor terminals,
visually check to see that the ignitor is heating.
(Ignitor may be viewed through the port glass in end
of burner tube.) The ignitor should glow bright red.
If the ignitor does not heat, replace the ignitor.
Ignition Control After 45 seconds of hot surface ignitor pre-heat, the
ignition control will switch 24 VAC to the gas control
valves. Check for 24 VAC output from ignition
control, across terminals marked "valve" and "valve
ground". If no voltage is present, replace ignition
control.
Gas Control Valves When 24 VAC is supplied to the gas control valve,
the valve should open. Check for gas pressure at
the manifold tap located just before the burner. If
there is no pressure, check the incoming gas supply
to be sure all manual valves are open and flexible
gas hose is properly connected. If gas is present
and coils of gas valve are energized, the gas valve is
probably defective.
Flame will not stay lit Hot Surface Ignitor Six seconds after the gas valve opens, ignition must
occur. if flame is not detected, the ignition control
will shut off and lock out. To reset the ignition
control, turn off the burner switch for 45 seconds,
then turn on the burner switch to retry ignition. The
ignition control requires a minimum of 0.8 D.C.
microamps. To check flame sensing operation,
connect a digital multimeter (capable of measuring
D.C. micro-amps) between the "ground" terminal on
ignition control and the ground lead.
NOTE: This is a current measurement and the
meter must be connected in series. If these
readings are not achieved, replace the hot surface
ignitor.
NOTE: The D.C. micro amp test must be conducted
with the oven in low flame (bypass) operation. Turn
the temperature control to the lowest setting.

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Power Supply If there is sufficient micro-amp current, but the flame
will not stay lit, check for proper polarity of the 120
VAC power supply.
Ignition Control If there is sufficient micro-amp current, and the 120
VAC polarity is correct, but the flame will not stay lit,
replace ignition control.
NOTE: Check for proper ground connection on
ignition control.
NOTE: Flame should be lit at
this time.
Low flame is on,
but no main flame Temperature Control Check for 120 VAC at terminal #7 to neutral on temperature control. If no voltage,
trace voltage back through centrifugal switch and hi-
limit. Turn the temperature adjustment knob to
maximum temperature position and check for 120
VAC at the load terminal #8 and neutral. If 120 VAC
is present and unit is not heating, refer to
"Temperature Solenoid Valve" for next check. If 120
VAC is not present, proceed.
Thermocouple Probe WITH POWER ON AND THERMOCOUPLE LEADS
ATTACHED TO THE TEMPERATURE CONTROL
BOARD: Measure the D.C. millivolt output of these
leads. Refer to thermocouple chart in Section D for
proper readings. If these readings are not achieved,
replace the thermocouple.
Temperature Set Disconnect the potentiometer leads
Potentiometer from the board. Place ohm meter test leads on the
blue and green pot leads. Reading should be 1 K
ohms. Place meter leads across the blue and purple
pot leads and rotate knob from high to low. Repeat
on green and purple leads. Check for even rise and
fall of ohms reading to insure that there are no open
or dead spots in the potentiometer. Check each
lead to ground for shorts. Replace pot if it does not
meet the above test.
Temperature Solenoid If 120 VAC is present on the
Valve temperature control board at load terminal #8 to
neutral, check for voltage at temperature regulation
valve. If voltage is present, listen for valve to open
and close. Also check for opens or shorts in the coil.
Replace as necessary.
Intermittent Heating Thermal/Overload of Main Fan
and Burner Blower Motors The main fan motor and the burner blower motor are equipped with internal thermal protection and will
cease to operate if over heating occurs. As the
motors overheat and then cool, this will cause the
units to cycle on and off intermittently. This may be
caused by improper ventilation or preventive
maintenance. Also, most of the problems listed
under "Oven will not heat" can cause intermittent
failure.
Conveyor will not run 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.
10 Amp Fuse Check and/or replace.
Fuseholder Check and/or replace.
Fan Switch See procedure for checking on Page 10.

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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 readings should show an even
transition from 0 to 10 K 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.
DC Motor Control Board Check for 120 VAC input to the control board at
terminals L1 and L2. If not present, check wiring
back to the oven fan switch. If 120 VAC is present
at L1 and L2, check both fuses on control board (8A
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 at
A+ and A-, but the 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. Check
motor brushes. 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 H.S.
board are not damaged). Replace motor as needed.
Conveyor Check for any mechanical misalignment. Also,
check for worn bearings. A conveyor belt that is
over tightened will cause excessive bearing wear
and sometimes, irregular speed.
Conveyor speed varying or
intermittent Power Supply Check power supply at the DC control board for the 120 VAC at board terminals L1 and L2.
Motor Control Board Place the test meter probes on terminals A+ and A-.
(With speed potentiometer set to maximum speed
(Approximately 2 min.) The meter reading should be
approximately 100 VDC (±3%), if voltage is not
steady within limits, 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.
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 11 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.

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Temp. display inoperative Display Transformer Measure the transformer primary for a nominal 120
VAC input, if voltage is not present, trace wiring back
to the oven power source. Measure the secondary
output, which will normally be 12-15 VAC. Voltage
across terminals 1 and 3 on the time/temp. display
should read 12-15 VAC. Terminals 1-2 and 2-3
should be 1/2 the voltage reading to 1-3. If the
above secondary readings are not achieved, replace
transformer.
Temp. Display If proper voltage is present at terminals 1, 2, and 3
on temperature display, but the display is not lighted,
recheck all connections for tightness. If temperature
display is still not operating, replace the temperature
display.
Temp. Display inaccurate,
erratic or inoperative Thermocouple Place the thermocouple of a pyrometer into the center of the top finger. Be sure the tip of the
thermocouple is not touching metal, it must sense air
temperature only. The pyrometer will indicate oven
temperature. Measure DC millivolts of thermocouple
at the temperature display. See thermocouple chart
on page 19 for proper readings. Replace
thermocouple if proper readings are not achieved. If
readings are correct on the thermocouple, replace
temperature display.

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TROUBLESHOOTING GUIDE / ELECTRIC OVENS
MODEL 1130-000-A 208 VAC SINGLE PHASE 60 HZ
MODEL 1131-000-A 240 VAC SINGLE PHASE 60 HZ
MODEL 1132-000-A 208 VAC THREE PHASE 60 HZ
MODEL 1133-000-A 240 VAC THREE PHASE 60 HZ
REFER TO PROPER SCHEMATIC FOR IDENTIFIED COMPONENTS
SYMPTOM POSSIBLE CAUSE EVALUATION
Oven fan will not run Incoming Power Supply Check circuit breakers. Rest if required. Call
power company in needed.
Fuses, 10 Amp, Fan and
Controls Check, replace if necessary.
Fuseholder Check, replace if necessary.
Control Box High Limit
Thermostat
Terminals are normally closed, but open at 140°F ±
5°F (60°C ± 2.8°C). Check for over heating and
reset thermostat. Test for proper operation. If it will
not reset and hold, then replace.
Switch, Main Fan Check for continuity between switch terminals.
Main Fan Motor Check for opens, shorts, or grounds. WITH
POWER OFF: Turn fan blade to check for locked
rotor.
Capacitor Check for opens, shorts, or grounds.
No control box cooling Check for main fan operation. If not operating, refer
to "Oven Fan Will Not Run".
Cooling Fan Motor 208/240 VAC should be present at the fan motor. If
voltage is present, check for opens or shorts.
WITH POWER OFF: Check for locked rotor of the
fan motor.
No automatic control
box cooling Incoming Power Supply Check circuit breakers. Reset if required. Call power company if needed.
Thermostat, Cooling Fan This normally open thermostat should close when
the temperature in the control box reaches 120°F
(48.9°C). If thermostat does to close, replace.
Cooling Fan Motor 208/240 VAC should be present at the fan motor. If
voltage is present, check for opens or short. WITH
POWER OFF: Check for locked rotor of the fan
motor.
Control box cooling fan
continues to run Thermostat, Cooling Fan This normally open thermostat should close at 120°F (48.9°C) and reopen at 100°F (37.8°C).
Oven will not heat Main Fan Motor Check for main fan operation. If it is not operating,
refer to "Oven fan will not run".
Air Pressure Switch This normally open switch should close when the
main fan is activated. Adjust if necessary (Refer to
page 23). 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, check for
proper location of capillary bulb in its spring holder.
If above checks okay, replace hi-limit thermostat.

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Temperature Control Check for supply voltage at temperature control. If
no voltage is present, trace wiring back to hi-limit
thermostat. Turn the temperature adjustment knob
to maximum temperature position and check for
208/240 VAC at the load terminals 7 and 8. If
208/240 VAC is present and unit is not heating,
refer to "Mercury Contactor" for next check. If
208/240 VAC is not present, proceed.
Thermocouple Probe WITH POWER ON AND THERMOCOUPLE
LEADS ATTACHED TO THE TEMPERATURE
CONTROL BOARD: measure D.C. millivolt output
of these leads. Refer to thermocouple chart in
Section D for proper readings. If these readings
are not achieved, replace thermocouple.
Temperature Control
Potentiometer Disconnect the potentiometer leads from the board. Place ohm meter test leads on the blue and green
pot. leads. Reading should be 1 K ohms.
Place meter leads across the blue and purple pot.
leads and rotate knob from high to low. Repeat on
green and purple leads. Check for even rise and
fall of ohms reading to insure that there are no open
or dead spots in the potentiometer. Check each
lead to ground for shorts. Replace pot if it does not
meet the above test.
Mercury Contactor Check for supply voltage to the contactor coil. If
voltage is present and the contactor will not
activate, replace the contactor. Also, check each
contactor for proper high voltage input and output.
Heater Elements Check the amp draw on each hot leg for proper
load. Check the specifications plate for rating
information. If the amp draw is low or high, check
the individual elements for opens, shorts, and
proper resistance. WITH POWER OFF: To check
resistance of the elements, remove all leads from
the elements and use an accurate digital VOM.
The element resistance should be as follows:
208V - 27 ohms approximately
240V - 36 ohms approximately
Oven heats with switch off Mercury Contactor 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 out put, replace the mercury contactor.
Intermittent Heating Thermal/Overload of motor The main fan motor is equipped with internal
thermal protection and will cease to operate if
overheating occurs. As the motor overheats and
then cools, this will cause the oven to cycle on and
off intermittently. This may be caused by improper
ventilation or preventive maintenance. Also, most
of the problems listed under "Oven will not heat"
can cause intermittent failure.
Conveyor will not run Voltage Supply Check incoming voltage supply at line 1 to neutral.
There should be a voltage reading of 208/240 VAC.
If not present, check breakers.
10 Amp Fuse Check and/or replace.
Fuseholder Check and/or replace.
Fan Switch See procedure for checking on page 8.

Impinger II –Advantage Service Manual - Domestic 15
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 10 K 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.
DC Motor Control Board Check for 208/240 VAC input to the control board at
terminals L1 and L2. If not present, check wiring
back to the oven fan switch. If voltage is present at
L1 and L2, check both fuses on control board (8A
line and 1A armature), check the VDC output at
terminals A+ and A-. If voltage is present at
terminals L1 and L2, and DC voltage is present at
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. Check
motor brushes. 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 H.S.
board are not damaged). Replace motor as
needed.
Conveyor Check for any mechanical misalignment. Also
check for worn bearings. A conveyor belt that is
over tightened will cause excessive bearing wear
and sometimes, irregular speed.
Conveyor speed varying or
intermittent Power Supply Check power supply at the DC control board for the 208/240 VAC at board terminals L1 and L2.
Motor Control Board Place the test meter probes on terminals A+ and A-.
(With speed potentiometer set to maximum speed
(Approximately 2 minutes), the meter reading
should be approximately 100 VDC (± 3%), if voltage
is not steady within limits, 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.
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.

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16
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 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.
Temp. Display inoperative
Display Transformer Measure the transformer primary for input, if voltage is not present, trace wiring back to the oven
power source. Measure the secondary output,
which will normally by 12-15 VAC. Voltage across
terminals 1 and 3 on the time/temp. display should
read 12-15 VAC. Terminals 1-2 and 2-3 should be
1/2 the voltage reading from 1-3. if the above
secondary readings are not achieved, replace
transformer
Temperature Display If proper voltage is present at terminals 1, 2, and 3
on temperature display, but the display is not
lighted, recheck all connections for tightness.
Temperature display is still not operating, replace
the temperature display.
Temp. Display inaccurate,
erratic or inoperative Thermocouple Place the thermocouple of a pyrometer into the center of the top finger. Be sure the tip of the
thermocouple is not touching metal, it must sense
air temperature only. The pyrometer will indicate
oven temperature.
Measure DC millivolts of thermocouple at the
temperature display. See thermocouple chart on
page 19 for proper readings. Replace
thermocouple if proper readings are not achieved.
If readings are correct on the thermocouple, replace
temperature display.

Impinger II –Advantage Service Manual - Domestic 17
REMOVAL, INSTALLATION, AND ADJUSTMENT
IMPINGER II ADVANTAGE
CAUTION!
BEFORE REMOVING OR INSTALLING ANY COMPONENT IN THE IMPINGER OVEN, BE SURE TO DISCONNECT
ELECTRICAL POWER AND GAS SUPPLY.
MOTOR, MAIN FAN
1. Shut off power at main breaker.
2. Remove motor cover from back of oven.
3. Remove wires for motor and mark for reassembly.
4. Remove hex head bolts from the oven back and slide back straight out of the oven.
5. Loosen bolt from fan hub and remove fan from motor shaft.
NOTE: Measure distance from fan blade to rear wall assembly before removal to aid in reassembly.
6. Remove the bolts from the motor mount and remove motor clamp. Slide the motor assembly out of the
oven back.
7. Remove motor by removing the four (4) mounting nuts and washers.
8. Reassemble in reverse order. When motor mount assembly is set on the oven back, align motor shaft in
the center of the hole. Set fan assembly on the motor shaft.
NOTE: It is recommended that an anti-seize compound be brushed on to the bolts around the back and
motor mount bracket before assembly.
FAN, MAIN
1. Shut off power at main breaker.
2. Remove back assembly. (See motor, main fan)
3. Reinstall and locate fan so that the bottom of the fan spider is 1 1/2" from the top of the oven back cone.
(See drawing)
FAN HUB
CONE
FAN SPIDER
1 1/2 INCH
NOTE: MEASUREMENT MUST BE
MADE FROM CONE TO FAN SPIDER
CAPACITOR, MOTOR
1. Shut off power at main breaker.
2. Remove control box cover and front panel.
3. Discharge capacitor.
4. Remove and replace.
ON/OFF SWITCH - REPLACEMENT
1. Shut off power at main breaker.
2. Remove control box cover.
3. Remove front panel.
4. Depress spring clips on side of switch and push out.
5. Remove wires from back of switch, note wire number and location.
6. Reassemble in reverse order and check system operation.
NOTE: Make sure switch housing is fully seated in control box housing.

Impinger II – Advantage Service Manual - Domestic
18
FUSE HOLDER - REPLACEMENT
1. Shut off power at main breaker.
2. Remove control box cover and front panel.
3. Remove wires from fuse holder and mark for reassembly.
4. Remove mounting screws or mounting nut on fuse holder. Push fuse holder out.
5. Reassemble in reverse order.
THERMOSTAT, CONTROL BOX HI-LIMIT - REPLACEMENT
1. Shut off power at main breaker.
2. Remove control box cover and front panel.
3. Remove wires from thermostat and mark for reassembly.
4. Remove mounting screws and nuts and remove thermostat.
5. Reassemble in reverse order.
NOTE: Push reset button on new thermostat.
COOLING FAN, CONTROL BOX
1. Shut off power at main breaker.
2. Remove control panel top and front cover.
3. Remove four (4) screws from the fan frame.
4. Disconnect cord and plug and remove fan.
5. Reassemble in reverse order.
THERMOSTAT, COOLING FAN
1. Shut off power at main breaker.
2. Remove control panel top and front cover.
3. Remove lead wires and mark for reassembly.
4. Remove two (2) screws and remove thermostat.
5. Reassemble in reverse order.
BURNER BLOWER MOTOR - REPLACEMENT
1. Shut off power at main breaker.
2. Remove control panel top and front cover.
3. Unplug motor connector.
4. Remove three (3) screws from blower tube at burner housing.
5. Remove air shutter assembly from old motor for installation on new motor assembly.
6. Reassemble in reverse order and check system operation.
NOTE: Check air shutter at approximately 1/2 open and adjust to get a blue flame with an occasional tip of yellow
under high flame. A view port in the burner assembly should be used to observe flame.
HIGH LIMIT THERMOSTAT - REPLACEMENT
1. Remove control panel top and front cover.
2. Remove conveyor and bottom finger assembly.
3. Remove capillary bulb from bracket in oven chamber and pull through tube into control box.
4. Remove two (2) wires from thermostat, note wire numbers and location for reinstallation.
5. Remove mounting nut and remove thermostat.
6. Reassemble in reverse order making sure capillary tube is placed securely in the bracket.
NOTE: Depress reset button to insure thermostat is set for operation.

Impinger II –Advantage Service Manual - Domestic 19
BURNER TRANSFORMER - REPLACEMENT
1. Shut power off at main breaker.
2. Remove control panel top and front cover.
3. Remove two (2) wires on primary side, note color and location.
4. Remove two (2) wires on secondary side, note color and location.
5. Remove two (2) screws from transformer base and replace assembly.
6. Reinstall in reverse order and check system operation.
THERMOCOUPLE - REPLACEMENT
1. Shut off power at main breaker.
2. Remove control panel top and front cover.
3. Slide thermocouple out of oven chamber.
NOTE: Remove conveyor and bottom finger assembly to aid in removal and installation of thermocouple.
4. Remove two (2) wires from temperature control. Make note of wire numbers or color and location for
reinstallation.
5. Reassemble in reverse order making sure the metal end on the thermocouple is securely held in the wire
form in the oven chamber.
THERMOCOUPLE MEASUREMENT CHART:
INFORMATION:
When two wires composed of dissimilar metals are joined together and one of the ends is heated, a continuous current
flow is generated. We use an iron constant (Type J) thermocouple. The iron wire increases the number of dissimilar
junctions in the circuit.
It is possible to check a thermocouple with a properly calibrated D.C. millivolt meter. At 32°F, the millivolt reading should
be 0.00. This can be checked by inserting the thermocouple into an ice bath.
The millivolt reading at 72°F should be 1.134.
When using the following chart, the temperature at the terminal connections must be noted. This temperature is called
the Junction Temperature.
The following chart lists the thermocouple millivolt readings from 200°F to 600°F.
EXPLANATION: The junction temperature is the ambient air temperature where the thermocouple fastens to the
electronic temperature control.
O V E N T E M P
200°F 250°F 300°F 325°F 350°F 400°F 425°F 450°F 500°F 550°F 600°F
J 90°F 3.26 4.77 6.30 7.06 7.83 9.37 10.14 10.91 12.46 14.00 15.53
U 88°F 3.32 4.83 6.36 7.12 7.89 9.43 10.20 10.97 12.51 14.05 15.59
N 86°F 3.37 4.88 6.41 7.17 7.94 9.49 10.26 11.03 12.57 14.11 15.65
C 84°F 3.43 4.94 6.47 7.23 8.00 9.54 10.31 11.09 12.63 14.19 15.71
T 82°F 3.49 5.00 6.53 7.29 8.06 9.60 10.37 11.14 12.69 14.23 15.76
I 80°F 3.55 5.06 6.59 7.35 8.12 9.66 10.43 11.20 12.74 14.28 15.82
O 78°F 3.60 5.11 6.64 7.40 8.17 9.72 10.49 11.26 12.80 14.34 15.86
N 76°F 3.66 5.17 6.70 7.46 8.23 9.77 10.55 11.32 12.86 14.40 15.94
75°F 3.69 5.20 6.73 7.49 5.26 9.80 10.57 11.35 12.89 14.43 15.97
74°F 3.72 5.23 6.76 7.52 8.29 9.83 10.60 11.37 12.92 14.46 15.99
72°F 3.78 5.29 6.82 7.58 8.35 9.89 10.66 11.43 12.97 14.51 16.05
T 70°F 3.83 5.34 6.87 7.63 8.40 9.95 10.72 11.49 13.03 14.57 16.11
E 68°F 3.89 5.40 6.93 7.69 8.46 10.00 10.78 11.55 13.09 14.63 16.17
M 66°F 3.95 5.46 6.99 7.75 8.52 10.06 10.83 11.61 13.15 14.69 16.23
P 64°F 4.01 5.52 7.05 7.81 8.58 10.12 10.89 11.66 13.20 14.74 16.28
62°F 4.06 5.57 7.10 7.86 8.63 10.18 10.95 11.72 13.26 14.80 16.34
60°F 4.12 5.63 7.16 7.92 8.69 10.24 11.01 11.78 13.32 14.86 16.40

Impinger II – Advantage Service Manual - Domestic
20
ELECTRONIC TEMPERATURE CONTROL BOARD - REPLACEMENT
1. Remove control box cover.
2. Disconnect wires and molded connector and mark for reinstallation.
3. Depress nylon clips and remove circuit board from mounting bracket.
4. Reassemble in reverse order and check operation.
ELECTRONIC TEMPERATURE CONTROL BOARD - CALIBRATION
1. Place the thermocouple of your test meter through a finger hole in the top center of the oven.
2. With temperature dial fully counter clockwise, align dial red line over "CAL" mark on temperature scale
and tighten dial knob.
3. Turn temperature dial fully clockwise, adjust pot on temperature control to achieve 575°F on temperature
meter.
4. Set dial to 500°F. Adjust dial to match actual temperature.
5. Seal adjustment pot with glyptol or nail polish.
TEMPERATURE CONTROL POTENTIOMETER - REPLACEMENT
1. Shut off power at main breaker.
2. Remove control panel top and front cover.
3. Loosen two (2) allen screws and remove knob by sliding off shaft.
4. Remove mounting nut from potentiometer shaft and push out.
5. Unplug wire connector from control board.
6. Reassemble in reverse order and check system operation.
HEAT LIGHT - REPLACEMENT
1. Shut off power at main breaker.
2. Remove control panel top and front panel.
3. Remove two wires from burner light, note number and location.
4. Grasp body of light assembly and slide sideways to remove.
5. Reassemble in reverse order and check.
BURNER CONTROL - HONEYWELL - REPLACEMENT
1. Shut off power at main breaker.
2. Remove control panel top and front cover.
3. Remove wires from control, note wire numbers and location for reassembly.
4. Remove screws from control and replace.
5. Reassemble in reverse order and check system operation.
GAS VALVE - REPLACEMENT
1. Shut off power at main breaker.
2. Shut off the gas supply in the main line to the oven.
3. Disconnect the flexible gas hose.
4. Remove the control panel top and front panel.
5. Remove the manual gas shut off valve from piping.
6. Remove screws from the bulkhead plate located on rear of oven at the gas pipe.
7. Remove the section of gas pipe to gas valve.
8. Disconnect the electrical leads from the solenoid valve. Disconnect bypass tube.
9. Loosen the gas line union located near the burner and remove the gas valve and piping assembly.
10. Finish removal of the gas piping from gas valve.
11. Reassemble in reverse order.
12. Check all gas fittings for leaks.
13. Adjust the gas manifold pressure on the gas valve. "Refer to the specification plate on the oven for
proper rating."