Lincoln 3270 Service Manual
PARTS & SERVICE MANUAL
Impinger 3270
Impinger 3270 CE
REV: 5/2/12
Lincoln Foodservice Products, LLC
1111 North Hadley Road
Fort Wayne, Indiana 46804
Telephone: 260.459.8200
Fax: 888.790.8193
Technical Support: 800.678.9511
lincolnfp.com
Table of Contents
MODEL NUMBER KEY............................................................................................................... 3
SEQUENCE OF OPERATION - DOMESTIC .............................................................................. 4
SEQUENCE OF OPERATION - INTERNATIONAL .................................................................... 5
SCHEMATIC DIAGRAM - DOMESTIC ....................................................................................... 6
SCHEMATIC DIAGRAM - INTERNATIONAL ............................................................................. 7
TROUBLESHOOTING GUIDE - DOMESTIC .............................................................................. 8
TROUBLESHOOTING GUIDE - INTERNATIONAL .................................................................. 13
REMOVAL, INSTALLATION & ADJUSTMENTS ...................................................................... 18
OVEN CONTROL – PROGRAMMING...................................................................................... 25
GENERAL VIEW ....................................................................................................................... 27
CONTROL BOX, LEFT SIDE - DOMESTIC .............................................................................. 29
CONTROL BOX, RIGHT SIDE - DOMESTIC ........................................................................... 31
CONTROL BOX, LEFT SIDE - INTERNATIONAL .................................................................... 33
CONTROL BOX, RIGHT SIDE – INTERNATIONAL ................................................................. 35
REAR WALL MOTOR ASSEMBLY ........................................................................................... 37
CONVEYOR, FULL BELT ......................................................................................................... 39
CONVEYOR, SPLIT BELT ........................................................................................................ 41
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Impinger 3270 Service Manual – Dom & Int’l
EXAMPLE: 3270-000-N-K1962 or 3270-000-NCE-K1962
32 70 - 0 00 - N - K1962
MODEL NUMBER KEY
Fuel Type / Agency Code (i.e. Natural / CE)
Custom Configuration Code (i.e. Solid Belt, General Market)
Language Code (i.e. English)
Oven Platform Size (cooking chamber width)
Oven Platform Size (belt width)
LANGUAGE CODE TABLE
CODE LANGUAGE COUNTRY CODE LANGUAGE COUNTRY
0 English Dom. & Int. Default N Finnish Finland
B French France/Luxembourg O Restricted ---
C German Germany P Norwegian Norway
D Italian Italy Q English Japan
E Spanish Spain R Swedish Sweden
F English UK/India/Africa/Hungary S English Australia
G Spanish Mexico/Latin America T Mandarin China
H Portuguese Portugal U Restricted ---
I Not Used --- V English Pacific Rim/Korea
J Danish Denmark W English Middle East
K
L Dutch Netherlands Y Not Used ---
M Greek Greece Z Not Used ---
Dutch &
French
Belgium X Not Used ---
FUEL TYPE TABLE
CODE TYPE CODE TYPE
N Natural Gas S 480V 3PH 60Hz
L LP Gas V 120/240V 3PH 60Hz
J 208V 1PH 60Hz B 230V 1PH 50Hz
M 220V 1PH 60Hz D 380/220V 1PH 50Hz
P 240V 1PH 60Hz G 415/240V 1PH 50Hz
R 208V 3PH 60Hz
Panel Setup Code
Impinger 3270 Service Manual – Dom & Int’l
3
SEQUENCE OF OPERATION - DOMESTIC
Model Gas Type Voltage Hz. Phase
3270 Natural Gas 120 VAC 60 Hz 1 Phase
3270 LP Gas 120 VAC 60 Hz 1 Phase
POWER SUPPLY
Electrical power to be supplied to the oven by a three conductor cordset.
Voltage from the black conductor to the white conductor to be 120VAC.
- White conductor is Neutral
- Green conductor is Ground
CONTROL BOX
AUTO COOL DOWN
When the temperature in either one of the control boxes reaches 120°F ± 3°F
(49°C ± 1.7°C), the cooling fan thermostats will switch power to the cooling fans.
The thermostats will interrupt power to the cooling fans when the temperature
falls to 100°F ± 3°F (37°C ± 1.7°C).
MAIN FAN CIRCUIT
120VAC is permanently supplied through a 15 amp fuse to the normally open
double pole power switch, to a normally open set of contacts on the main fan
relay and the normally open cooling fan thermostats. Closing the power switch
supplies 120VAC to the coil of the time delay relay. These normally open
contacts now close supplying 120VAC to the time delay which then supplies
120VAC to the main fan relay coil closing the normally open contacts, which then
supplies 120VAC to the main fan motors.
BURNER CIRCUIT
Closing the Oven Power Switch also supplies 120VAC to the burner blower
motors. NOTE: This oven utilizes two (2) complete Burner/Temperature Control
systems. The sequence of operations is the same for each system. 120VAC is
supplied, through the Centrifugal Switch of the Main Fan Motor (this switch
closes when the Main Fan reaches approximately 900 R.P.M.) to the primary of
Ignition Control Transformers. As the Burner Blower reaches approximately
1600 R.P.M., its internal centrifugal switch will close, supplying 24VAC to the
ignition control. The Ignition Control operates on both 24VAC and 120VAC.
When the control is energized by 24VAC, 120VAC is switched to the Hot Surface
Igniter for 45 seconds for Hot Surface Igniter warm up. The igniter glows red,
24VAC is switched to the MV/PV gas valve which opens, and ignition should now
occur. If ignition does not occur in 6 seconds, the control will lock out. To
recycle after lockout, turn off the main oven switch for 45 seconds and then turn
the switch back on.
TEMPERATURE CONTROL
When the Oven Power Switch closes, power is supplied to the Oven Control
Transformers which supply 24VAC to the oven controls (TWO CONTROLS –
one for the left side of oven, one for the right side of oven). The oven control is
set to a desired temperature. Thermocouples will provide varying millivolts to the
oven controllers. The oven controllers supply 3-24VDC to the modulating valve
to maintain desired temperature.
CONVEYOR DRIVE
Line voltage (120VAC) is supplied to the conveyor motor. The conveyor speed is
controlled by an increase or decrease in frequency for the conveyor controller.
Secondary voltage, 24VAC, is supplied to the oven control. Setting the oven
control to the desired time, outputs line voltage, through a reversing switch, to
the conveyor motor.
Speed is monitored via frequency output from the hall effect sensor.
NOTE: The conveyor control uses a hall effect sensor and magnet mounted in the conveyor motor that senses the
motor speed. Any change in motor load (± R.P.M.) is detected by the sensor and the frequency to the motor is
adjusted accordingly.
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Impinger 3270 Service Manual – Dom & Int’l
SEQUENCE OF OPERATION - INTERNATIONAL
Model Gas Type Voltage Hz. Phase
3270 CE Natural Gas 230 VAC 50 Hz 1 Phase
3270 CE LP Gas 230 VAC 50 Hz 1 Phase
POWER SUPPLY
CONTROL BOX
AUTO COOL DOWN
Electrical power to be supplied to the oven by a three conductor service.
When the temperature in either one of the Control Boxes reaches 49°C ± 1.7°C,
(120°F ± 3°F) the Cooling Fan Thermostats will switch power to the Cooling
Fans. The thermostats will interrupt power to the Cooling Fans when the
temperature falls to 37°C ± 1.7°C (100°F ± 3°F).
MAIN FAN CIRCUIT
Power is permanently supplied through a 10 amp fuse, through the normally
closed emergency stop button, to the normally open double pole power switch, to
a normally open set of contacts on the main fan relay and the normally open
cooling fan thermostats. Closing the power switch supplies line voltage to the
coil of the time delay relay. These normally open contacts now close enabling
the time delay which then supplies line voltage to the main fan relay. As these
normally open contacts close, line voltage is supplied to the main fan motors.
BURNER CIRCUIT
Closing the oven power switch supplies line voltage, through the main fan air
pressure switch, through the normally closed oven cavity hi-limit thermostat, to
the ignition control. The combustion motor is now energized; the normally open
combustion air pressure switch closes upon sensing air. After a prepurge period
between 30 and 60 seconds, the spark and main gas valve are energized.
Ignition should now occur.
TEMPERATURE CONTROL
When the Oven Power Switch closes, power is supplied to the Oven Control
transformers which supply 24 VAC to the Oven Controls (TWO CONTROLS one
for the oven’s left side, one for the oven’s right side). The Oven Control is set to a
desired temperature. Thermocouples will provide varying millivolts to the Oven
Controllers. The Oven Controllers supply 3-24 VDC to the modulating valve to
maintain desired temperature.
CONVEYOR DRIVE
Line voltage is supplied to the conveyor motor. The Conveyor speed is controlled
by an increase or decrease in frequency from the Conveyor Controller.
Secondary voltage, 24VAC, is supplied to the oven control. Setting the oven
control to the desired time, outputs line voltage, through a reversing switch, to
the conveyor motor.
Speed is monitored via a frequency output from the hall effect sensor.
NOTE: The conveyor control uses a hall effect sensor and magnet mounted in the conveyor motor that senses the
motor speed. Any change in motor load (± R.P.M.) is detected by the sensor and the frequency to the motor is
adjusted accordingly.
Impinger 3270 Service Manual – Dom & Int’l
5
SCHEMATIC DIAGRAM - DOMESTIC
MODEL 3270 120V 60HZ 1PH NATURAL or LP GAS
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Impinger 3270 Service Manual – Dom & Int’l
SCHEMATIC DIAGRAM - INTERNATIONAL
MODEL 3270 CE 230V 50HZ 1PH NATURAL or LP GAS
Impinger 3270 Service Manual – Dom & Int’l
7
TROUBLESHOOTING GUIDE - DOMESTIC
SYMPTOM
POSSIBLE CAUSE
EVALUATION
Model Number Gas Type Voltage Hz. Phase
3270 Natural Gas 120 VAC 60 Hz 1 Phase
3270 LP Gas 120 VAC 60 Hz 1 Phase
Oven fan will not run
No control box cooling
Incoming Power Supply Check breakers, reset if required. Check power plug to be
sure it is firmly in receptacle. Measure the incoming power.
Call power company if needed.
Fuse, 15 Amp
Fuse Holder
Main Oven Switch
Time Delay Relay
Check, replace if necessary.
Check, replace if necessary.
Check continuity between switch terminals. Replace if
necessary.
Check for 120 VAC to the relay coil. If voltage is not
present, trace wiring back to the oven power switch. If
voltage is present, check to insure contacts are closing.
Time Delay
120 VAC is permanently supplied to the time delay. If no
voltage is present, trace wiring back to fuse and incoming
power. Neutral side of time delay coil is switched by the
time delay relay. When the time delay is enabled, it
supplies 120 VAC to coil of main fan relay.
Main Fan Relay
Check for 120 VAC to main fan relay coil. If no voltage is
present, trace back to time delay. If 120 VAC is supplied to
main fan relay coil, ensure the contacts of main fan relay
are closing by checking for 120 VAC on terminals #4 to a
neutral and #8 to a neutral (these are the terminal numbers
on the main fan relay). If contacts are not closing, replace
the relay. Each terminal supplies a main fan motor with
120 VAC.
Main Fan Motor
Check for 120 VAC at motor. If voltage is present and
motor doesn’t turn, WITH POWER OFF check for opens,
shorts, or grounds. Turn fan blade to check for locked
rotor. Replace as needed.
Capacitor
WARNING: Capacitor has a stored charge, discharge
before testing. Check for shorts or grounds, replace as
needed. Inspect for any visible damage. If the top of the
capacitor appears to be swollen, replace capacitor.
Incoming Power
Fuse, 15 Amp
Fuse Holder
Main Oven Switch
Cooling Fan(s)
Check main circuit breakers and reset, if required. Call
power company if needed.
Check, replace if necessary.
Check, replace if necessary.
Check continuity between switch terminals. Replace if
necessary.
120 VAC should now be at the fan motor. If voltage is
present and motor doesn’t turn, WITH POWER OFF, check
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Impinger 3270 Service Manual – Dom & Int’l
motors for shorts or opens. Check for locked rotor.
Replace if necessary.
No automatic control box
cooling
Incoming Power Supply Check circuit breakers. Reset if required. Call power
Fuse, 15 Amp
Fuse Holder
Cooling Fan Thermostat Check the cooling fan thermostat. (Thermostat closes at
company if needed.
Check, replace if necessary.
Check, replace if necessary.
120°F and opens at 100°F.) With the cooling fan
thermostat preheated, check for continuity. If switch is
open, replace.
Cooling Fan(s)
120 VAC should be at the motor. If voltage is present,
WITH POWER OFF, check for locked rotor. Check motor
for shorts, opens, or grounds.
Oven will not heat
Gas Supply
Check manual gas valves and flexible gas line connection.
Also check for adequate gas supply.
NOTE: Natural Gas supply to oven – min. 7 in. W.C.
LP Gas supply to oven – min. 11 in. W.C.
Main Fan
If not operating, refer to “oven fan will not run”.
NOTE: These ovens utilize 2 complete burner/temperature control systems. Each system will follow the same
troubleshooting sequence.
Oven will not heat
Centrifugal Switch of
Main Fan Motor
Check for 120 VAC supplied to the centrifugal switch. If
voltage is not present, trace the wiring back to the oven
power switch. Check for 120 VAC out of the centrifugal
switch. If voltage is supplied to the centrifugal switch, and
motor is running but there is no voltage out of the
centrifugal switch, replace the fan motor.
(NOTE: See Schematic Diagram of proper wire numbers
on motors.)
Burner Blower Motor
If no 120 VAC to blower motor, trace wiring back to oven
power switch. Check for 120 VAC supply to the burner
blower motor, if 120 VAC is present and motor does not
turn, replace the motor.
Burner Transformer
Check for 120 VAC to primary of the 24 VAC ignition
control transformer. If voltage is not present, trace wiring
back to the centrifugal switch of main fan motor. If voltage
is present, check for 24 VAC at the secondary. If no
secondary voltage is present, replace the transformer.
Centrifugal Switch of
Burner Blower Motor
Check for 24 VAC supply to the centrifugal switch of burner
blower motor (see Schematic for proper wire numbers). If
no voltage is present, trace wiring back to the transformer.
If voltage is present, check for 24 VAC at the output of the
centrifugal switch. If there is no output and the burner
blower motor is running, replace the burner blower motor.
Ignition Control
Check for 24 VAC supply to the ignition control at terminals
marked 24V and 24V. If voltage is not present, trace wiring
back to the centrifugal switch of burner blower motor.
Check for 120VAC supply to the ignition control at
Impinger 3270 Service Manual – Dom & Int’l
9
Oven will not heat
(continued)
Hot Surface Igniter
(Located inside Burner
Assembly)
Flame will not stay on
NOTE: Flame should be lit at this time.
Low flame is on but no
Ignition Control
Gas Control Valves
Hot Surface Igniter
Power Supply
Oven Control
main flame
Thermocouple Probe
10
terminals L1 and L2. If no voltage is present, trace wiring
back to oven power switch. If the above checks are okay,
proceed. When 24 VAC is applied, the ignition control
should switch 120VAC to the hot surface igniter for 45
seconds. Check across the (2) terminals marked HIS. If
no voltage is present, replace the ignition control.
If 120VAC is present at HSI terminals, visually check to
see that the hot surface igniter is heating (igniter may be
viewed through port glass in end of burner tube). The
igniter should glow bright red. Check all connections to be
sure they are tight. If the igniter does not heat, replace.
After 45 seconds of hot surface igniter pre-heat, the ignition
control will switch 24 VAC to the gas control valves for 6
seconds. Check for 24 VAC output from the ignition
control and across terminals marked “valve” and “valve”. If
no voltage is present, replace the ignition control.
NOTE: The ignition control contains a safety lockout
circuit. If a flame is not detected within 6 seconds after the
gas control valve is energized, the ignition control will
lockout. To reset, turn the power switch “off”, wait 45
seconds and switch the system “on” to retry ignition.
Check for 24 VAC supplied to the pilot/main gas valves
(dual valve). If voltage is present, the valves should open.
Check the output gas pressure at the pressure tap located
on the burner manifold. Gas pressure should measure
approximately .6 in. W.C. If there is no gas pressure and
the voltage is supplied to valves, check piping for
obstructions.
The ignition control will keep the gas control valves
energized for 6 seconds. At the end of 6 seconds the hot
surface igniter must sense a flame or the ignition control
will go to into lockout. (The ignition control requires a
minimum of 0.8 micro-amps D.C.) If you detect a flame but
only for the 6 second trial, check the flame sensing
operation. Connect a digital multimeter (capable of
measuring D.C. micro-amps) between the “ground”
terminal on the ignition control and the ground lead.
NOTE: This is a current measurement and the meter must
be connected in series. NOTE: The D.C. micro-amp test
must be conducted in series. NOTE: The D.C. micro amp
test must be conducted with the oven in low flame (bypass)
operation. Set the temperature control to its lowest setting.
If there is sufficient micro-amp current and the 120VAC
polarity is correct but the flame will not stay lit, check for
proper ground connection for the ignition control. If ground
is good, replace the ignition control.
Adjust temperature to maximum setting and check for 3-24
VDC at terminals J2-6 & J2-9 on oven control. If 3-24 VDC
is present and unit is not heating, refer to “Modulating
Valve” for next check. If 3-24 VDC is not present, proceed.
WITH POWER ON AND THERMOCOUPLE LEADS
Impinger 3270 Service Manual – Dom & Int’l
Low flame is on but no
Thermal/Overload of Main
main flame (continued)
Modulating Valve
Intermittent heating
Fan and Burner Blower
Motors
Conveyor will not run
Power Supply
15 Amp Fuse
Fuse Holder
Main Fan Switch
Oven Control
Transformer
Switch, Conveyor
Reversing
Conveyor Motor
Conveyor Motor
Capacitor
Impinger 3270 Service Manual – Dom & Int’l
ATTACHED TO THE TEMPERATURE CONTROL
BOARD:
Measure the D.C. millivolt output of these leads. Refer to
thermocouple chart in “Removal and Installation” section of
service manual for proper readings. If these readings are
not achieved, replace the thermocouple. If these readings
are achieved with temperature at maximum setting, replace
the oven control.
With temperature at maximum setting, check for 3-24 VDC
at the modulating valve. If no voltage is present, trace
wiring back to the oven control terminals J2-6 & J2-9. If
voltage is present, check the output gas pressure at the
pressure tap located on the burner manifold. If voltage is
present and gas pressure is not exceeding .6 in. W.C. at
the burner manifold, replace modulating valve.
The main fan motors and the burner blower motors are
equipped with internal thermal protection and will cease to
operate if overheating occurs. As the motors overheat and
then cool, this will cause the units to cycle on and off
intermittently. Improper ventilation or improper
maintenance may cause this. Also, most of the problems
listed under “oven will not heat” can cause intermittent
failure.
Check incoming voltage supply at line 1 to neutral. There
should be a voltage reading of 120VAC. If not present,
check breakers.
Check and/or replace.
Check and/or replace.
Check continuity between switch terminals.
Check for supply voltage to primary of transformer. If no
voltage is present, trace wiring back to the main oven
switch. If voltage is present, check for 24VAC at
transformer secondary. If there is primary voltage but no
secondary voltage, replace transformer. If secondary
voltage is present, proceed.
Check for continuity between switch terminals. Replace
switch as needed.
Check for supply voltage to the motor. If no voltage is
present, trace wiring back to the reversing switch. If no
voltage at switch, replace conveyor control. If voltage is
present, check motor windings for opens or shorts.
WITH POWER OFF: Check the motor windings as follows:
Grey to Black – 38 ohm approx.
Grey to Brown – 38 ohm approx.
Brown to Black – 75 ohm approx.
If any of the above fail, replace motor.
Check for shorts or grounds. Replace capacitor as
needed.
WARNING: Capacitor has a stored charge. Discharge
before testing!
11
Conveyor will not run
(continued)
Conveyor runs but no
speed control
Conveyor Check for any mechanical problems in the conveyor
assembly. Check for damaged or torn belting. Check
conveyor shaft bearings for damage or excessive wear.
Repair or replace conveyor components as needed.
Oven Control
Check output voltage from oven control to hall effect sensor
(sensor is located in conveyor motor). Measure voltage at
the motor connector, red wire and yellow wire. Voltage
should be approx. 10VDC. If no voltage is present, trace
wiring back to the oven control. If there is no voltage
output present at the oven control, replace the oven
control.
Motor, Conveyor
If there is voltage supplied to the hall effect sensor, check
for frequency output from the hall effect sensor. Measure
frequency across the yellow and white wires at the motor
connector. Frequency readings should be between 25 –
500 Hz. If these readings are not achieved, replace the
conveyor motor. If these readings are achieved, proceed.
Oven Control
If the hall effect sensor readings are correct but there is no
speed indicated on the display, replace the oven control.
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Impinger 3270 Service Manual – Dom & Int’l
TROUBLESHOOTING GUIDE - INTERNATIONAL
SYMPTOM
POSSIBLE CAUSE
EVALUATION
Model Number Gas Type Voltage Hz. Phase
3270 CE Natural Gas 230 VAC 50 Hz 1 Phase
3270 CE LP Gas 230 VAC 50 Hz 1 Phase
Oven fan will not run
No control box cooling
Incoming Power Supply Check breakers, reset if required. Check power plug to be
sure it is firmly in receptacle. Measure the incoming power.
Call power company if needed.
Fuse, 10 Amp
Fuse Holder
Emergency Stop Button
Main Oven Switch
Time Delay Relay
Check, replace if necessary.
Check, replace if necessary.
This is a normally closed switch. Be sure button is re-set.
Check continuity between switch terminals. If switch is
open, replace Emergency stop button.
Check continuity between terminals. Replace if necessary.
Check for line voltage to the relay coil. If voltage is not
present, trace wiring back to the oven power switch. If
voltage is present, check to insure contacts are closing.
Replace as needed.
Time Delay
Line voltage is permanently supplied to terminal #1 of the
time delay. If no voltage present trace wiring back to fuse
and incoming power. Neutral side of time delay coil is
switched by the time delay relay. When the time delay is
enabled, line voltage is supplied to coil of main fan relay.
Main Fan Relay
Check for line voltage to main fan relay coil. If no voltage is
present, trace wiring back to time delay. If line voltage is
supplied to main fan relay coil, ensure the contacts of main
fan relay are closing by checking for output voltage from
relay contacts. If contacts are not closing, replace relay.
Each terminal supplies a main fan motor with line voltage.
Main Fan Motor
Check for line voltage at motor. If voltage is present and
motor doesn’t turn, WITH POWER OFF, check for opens,
shorts, or grounds. Turn fan blade to check for locked
rotor. Replace as needed.
Capacitor
WARNING: Capacitor has a stored charge, discharge
before testing. Check for shorts or grounds, replace as
needed. Inspect for any visible damage. If the top of the
capacitor appears to be swollen, replace capacitor.
Incoming Power
Fuse, 10 Amp
Fuse Holder
Main Oven Switch
Cooling Fan(s)
Check main circuit breakers and reset, if required. Call
power company if needed.
Check, replace if necessary.
Check, replace if necessary.
Check continuity between terminals. Replace if necessary.
Line voltage should now be at the fan motor. If voltage is
Impinger 3270 Service Manual – Dom & Int’l
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