Lincoln E260 User Manual

SERVICE MANUAL

(INTERNATIONAL)

IMPINGER COUNTERTOP OVEN

MODEL 1100-000-A SERIES

(SN 2038615 & BELOW)

SERVICE MANUAL

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

1100advexport REV 1/5/07

SEQUENCE OF OPERATIONS

(For serial numbers before 2038616 w/ analog control)

MODEL 1154-000-EA NAT. GAS 230 VAC 50 HZ. 1 PHASE
MODEL 1155-000-EA LP GAS 230 VAC 50 HZ. 1 PHASE

POWER SUPPLY
Electrical power to be supplied to the oven by a three conductor service.

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° (37.8°C, ± 1.7°C).

MAIN FAN CIRCUIT
Power is permanently supplied through the 10A oven fuse, through the normally closed control box hi-limit
thermostat (opens at 140° F, 60° C) to the normally open double pole oven fan switch and to the cooling fan.
Closing the oven fan switch supplies line voltage to the main fan motor. Closing the fan switch also supplies
voltage to the cooling fan. The conveyor, burner and temperature display are also energized.

BURNER CIRCUIT
Closing the oven fan switch supplies line voltage through the normally open gas pressure switch (located in the
gas valve and closed when gas pressure is present), through the normally open air pressure switch (closed by air
pressure from the main fan), through the normally closed oven cavity hi-limit thermostat (opens at 662° F, 350°C
which is manually resettable after a drop in temperature of 18° F, 10° C), and to the ignition control.

IGNITION CONTROL
The ignition control switches line voltage to the combustion blower motor, the combustion air switch switches from
normally closed to normally open upon sensing air pressure in the burner housing. After a pre-purge period of
between 30 and 60 seconds, the spark generator is energized, the main gas valve and the burner pilot light are
energized, and ignition should now occur.

TEMPERATURE CONTROL
Closing the oven fan switch supplies line voltage to the temperature control. The 1K ohm temperature pot. is
adjusted to desired temperature. The thermocouple will provide varying millivolts to the temperature control. The
temperature control supplies line voltage to the temperature regulation valve at intermittent intervals to maintain
desired temperature. The heat lamp is energized with the temperature regulation valve.

CONVEYOR DRIVE
Closing the oven fan switch supplies line voltage 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 increase 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 line voltage to primary of the temperature display transformer. The secondary of this
transformer supplies 12VAC to the temperature display. The thermocouple supplies DC millivolts to the
temperature display. The display converts this millivolt reading to a temperature reading.

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Impinger II – 1100-000-A Series (SN 2038615 & Below) Service Manual –Int’l

SEQUENCE OF OPERATIONS

MODEL 1164-000-EA 400/230 VAC 50 HZ. 3 PHASE

POWER SUPPLY
Electrical power to be supplied to the oven by a four conductor service.
Brown conductor is Hot.
Black conductor is Hot.
Black conductor is Hot.
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° (37.8°C, ± 1.7°C).

MAIN FAN CIRCUIT
Power is permanently supplied through the normally closed oven cavity hi-limit, through the 10A fuse, through the
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 230 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.

HEAT CIRCUIT
Closing the oven fan switch supplies 230VAC, through the normally open air pressure switch (closed by air
pressure from the main fan) to the electronic temperature control. The 1K ohm temperature potentiometer is
adjusted to desired temperature. The thermocouple will provide varying millivolts to the temperature control. The
temperature control then supplies 230 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 oven fan switch supplies 230 VAC through the EMI filter 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 main fan switch supplies 230 VAC to the primary of the temperature display transformer. The
secondary of this transformer supplies 12 VAC to the temperature display. The thermocouple supplies DC
millivolts to the temperature display. The display converts this millivolt reading to a temperature reading.

Impinger II – 1100-000-A Series (SN 2038615 & Below) Service Manual –Int’l

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SCHEMATIC DIAGRAM

MODEL 1154-000-EA, 1155-000-EA

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Impinger II – 1100-000-A Series (SN 2038615 & Below) Service Manual –Int’l

SCHEMATIC DIAGRAM

MODEL 1164-000-EA

Impinger II – 1100-000-A Series (SN 2038615 & Below) Service Manual –Int’l

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TROUBLESHOOTING GUIDE

GAS OVENS
1154-000-EA NAT. GAS 230VAC 50 HZ. 1 PHASE
1155-000-EA LP GAS 230VAC 50 HZ. 1 PHASE

REFER TO PROPER SCHEMATIC FOR IDENTIFIED COMPONENTS

SYMPTOM POSSIBLE CAUSE EVALUATION
Oven fan will not run

No control box cooling

No automatic control box
cooling

Oven will not heat

Incoming power supply Check breakers, reset if required. Check power

plug to be sure it is firmly in receptacle.
Measure incoming power, call power co. if

needed
Fuse, 10A Check, replace if necessary.
Fuse holder Check, replace if necessary.
Hi-limit thermostat, control
box

Main fan switch With power off, Check continuity between

Main fan motor Check for opens, shorts or grounds. With

Capacitor Check for shorts or grounds.

Incoming power supply Check main circuit breakers, reset if required.

Main fan switch With power off, Check continuity between

Cooling fan Line voltage should now be at the cooling fan.

Incoming power supply Check main circuit breakers, reset if required.

Cooling fan thermostat Check the cooling fan thermostat (thermostat

Gas supply Check for adequate gas supply and be sure

Main fan If not operating, refer to “Main fan will not run”
Gas pressure switch This switch is located inside the gas valve and

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° C)

replace thermostat.

switch terminals. Replace as needed.

power off, turn fan blade to check for locked

rotor.

WARNING: Capacitor has a stored charge,

discharge before testing.

Call power co. if needed.

switch terminals. Replace as needed.

If voltage is present, check motor for shorts or

opens. With power off, check for locked rotor.

Call power co. if needed.

closes at 120° F and opens at 100° F). With the

cooling fan thermostat preheated, check for

continuity. If switch is open, replace thermostat.

that manual gas shut off valve is open. Also

check flexible gas line connection.

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. If no continuity, check the

following: Proper gas pressure supply to gas

valve as marked on the oven specification

plate. Check for proper adjustment of gas

pressure switch, 10 for Nat. gas, 27 for LP gas

or 4.5 for town gas. Check the filter in gas

valve for blockage or damage. If above checks

are okay, but pressure switch is still not closed,

replace gas valve.

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Impinger II – 1100-000-A Series (SN 2038615 & Below) Service Manual –Int’l

Air pressure switch Check air switch terminals for supply voltage to

terminals NO 2 and COM. If voltage is present

on one side only, check for air tube blockage or

misalignment. If these are okay, adjust switch

or replace if necessary.
Oven cavity hi-limit
thermostat

Terminals are normally closed, opens at 660° F

(350° C). If 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 are okay, replace hi-limit

thermostat.
Ignition control Check for proper supply voltage to ignition

control. Check for proper line voltage to the

burner blower motor. This can be checked at

motor connecting plug terminals 2 and 5. 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 checks okay,

replace ignition control.
Burner blower motor Check for supply voltage to motor. WITH

POWER OFF: Turn blower wheel to check for

locked rotor. If proper supply voltage is present

at motor connecting plug, terminals 2 and 5,

and motor does not run, replace motor.
Air pressure switch
(burner blower)

Check for proper supply voltage switching from

“NC” to “NO” on ignition control. Check for air

switch adjustment, air tube blockage or

misalignment. 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 supply

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 there is input voltage but

there is no output voltage, replace spark

generator.
Igniter/sensor assembly Check this assembly for visible damage.

Replace as needed. If there is no visible

damage, check for supply voltage to

igniter/sensor assembly. If there is supply

voltage to igniter/sensor assembly, but there is

no spark, replace igniter/sensor assembly.
Gas valve Gas valve should open when proper supply

voltage is present. If no voltage is present,

check the reset button on ignition control, and

all connections for tightness. If there is still no

voltage at gas valve, replace the 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 the gas valve.

Impinger II – 1100-000-A Series (SN 2038615 & Below) Service Manual –Int’l

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Flame will not stay on

Flame sensor To check for flame sensor operation, connect a

Power supply Turn the temperature to the lowest temperature

Ignition control If there is sufficient flame sensor current, but

NOTE: Flame should be lit at
this time

Low flame is on, but no main

Temperature control Check for supply voltage at terminal #7 to L2

flame

Thermocouple With power on and thermocouple leads

Temperature potentiometer Disconnect the potentiometer leads from the

Temperature regulation valve If supply voltage is present on the temperature

Intermittent heating Thermal overload of main fan

and burner blower motors

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Impinger II – 1100-000-A Series (SN 2038615 & Below) Service Manual –Int’l

digital multimeter (capable of measuring DC

microamps) between the flame sensor wire and

terminal #1 on the ignition control. Sensor

current is to be 3 microamps, minimum. If

these readings are not achieved, replace

igniter sensor assembly. Also, check for any

type of damage to flame sensor wire and

connections. NOTE: The DC microamp test

must be conducted with the oven in low flame

(bypass) operation.

setting. If there is sufficient microamp current,

but the flame will not stay lit, check for proper

polarity of the power supply.

the burner will not remain ignited, check the

reset button on ignition control. If all above test

okay, replace ignition control.

on temperature control. If there is no voltage,

trace wiring back to oven fan switch. Turn the

temperature adjustment knob to maximum

temperature position and check for supply

voltage at the load terminal #8 and L2. If

voltage is present and unit is not heating, refer

to “Temperature regulation valve” for next

check. If voltage is not present, proceed.

attached to the temperature control board:

Measure the DC millivolt output of these leads.

Refer to thermocouple chart in “removal and

installation” section for proper readings. If

these readings are not achieved, replace

thermocouple.

temperature control board. Place ohmmeter

test leads on the blue and green pot. leads.

Reading should be 1K ohms. Place meter

leads on the blue and purple pot. leads and

rotate knob from high to low. Repeat on green

and purple leads. Check for an 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 any short

circuits to ground. Replace as needed.

control board at load terminals #8 and L2,

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 operating coil. Replace as needed.

The main fan motor and burner blower motor

are equipped with internal thermal protection

and will cease to operate if overheating occurs.

As these motors overheat and then cool, the

burners will cycle on and off intermittently.

Improper ventilation or a lack of preventive

maintenance may cause this condition. Also,

most of the problems listed under “Oven will

not heat” can cause intermittent failure.

Conveyor will not run

Power supply Check incoming power supply, If no voltage is

present, check circuit breakers.
Fan switch With power off, Check continuity between

switch terminals. Replace as needed.
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. Place the meter leads on

the black and white pot. leads. 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 throughout the rotation of the

potentiometer. Check both pot. leads to

ground. There should be no continuity to

ground. If any of the above checks fail, replace

the potentiometer.
DC motor control board Check for supply voltage input to the control

board at terminals L1 and L2. If voltage is not

present, check wiring back to the oven fan

switch. If supply voltage is present, check both

fuses on control board (8A line and 1A

armature). Check the DC voltage output at

terminals A+ and A-. If there is power in to the

control board but no power at A+ and A-, check

the following:
Hall effect sensor Disconnect the Hall effect sensor from the DC

motor control board. If the motor begins to run,

replace the Hall effect sensor.
DC motor control board If, after disconnecting the Hall effect sensor,

the motor is still not running, check for DC

voltage from terminals A+ and A-. If there is no

DC voltage, replace the DC motor control

board.
Circuit breaker If there is DC voltage output from the DC motor

control board, but the motor is still not running,

check the 0.4 Amp circuit breaker. Disconnect

wires from the circuit breaker and check for

continuity through the circuit breaker. Reset

circuit breaker or replace as needed.
Conveyor gearmotor 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. Rotate motor shaft to determine if there

is a locked rotor or a locked gearbox (use care

so that magnet and sensor are not damaged).

Check motor brushes for damage or excessive

wear, replace brushes if needed. Replace

motor if needed. Also check to be sure that the

conveyor drive coupling is tight and properly

engaged to the conveyor shaft.
Conveyor Check for any mechanical misalignment. Also,

check for worn bearings. A conveyor belt that is

too tight may cause excessive bearing wear

and sometimes, irregular speed.

Conveyor speed unsteady Power supply Check power supply at the DC motor control

board for supply voltage at terminals L1 and

L2. Supply voltage should be steady.

Impinger II – 1100-000-A Series (SN 2038615 & Below) Service Manual –Int’l

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Temperature display
inoperative

Temperature display
inaccurate, or erratic

10

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. Place the meter leads on

the black and white pot. leads. 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 throughout the rotation of the

potentiometer. Check both pot. leads to

ground. There should be no continuity to

ground. If any of the above checks fail, replace

the potentiometer.
Magnet Check to insure that the magnet (cemented to

shaft of conveyor drive motor) has not been

damaged, or come loose from the motor shaft.

Re-glue or 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.

Replace as needed.
Hall effect sensor cable Check continuity through the wires in the cable.

Check all wiring and connections for visible

damage. Replace as needed.
DC motor control board With motor running, measure DC voltage

across the red wire and black wire in the hall

effect cable (all wires must be connected

during this test). Voltage reading should be

approx. 12VDC and steady. If this reading is

not achieved, replace DC motor control board.
Hall effect sensor With the motor running at maximum speed,

measure the frequency across the white wire

and the black wire in the hall effect cable (all

wires must be connected during this test).

Reading should be approx. 327 Hz. And

steady. If there is no reading, replace hall effect

sensor. If the reading is unsteady, calibrate the

DC motor control board.
Display transformer Measure the transformer primary for supply

voltage input. If voltage is not present, trace

wiring back to the oven fan switch. Measure

the secondary output, which will normally be

12-15VAC. Voltage across terminals 1-3

should be 12-15VAC. Terminals 1-2 and 2-3

should be ½ the voltage reading 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. If

temperature display is still not operating,

replace the temperature display.
Thermocouple Place the thermocouple of a pyrometer into the

center of the top finger. The pyrometer will

indicate oven temperature. Measure DC

millivolts of thermocouple at the temperature

display. See thermocouple chart in “Removal

and Installation” section for proper readings.

Replace thermocouple if proper readings are

not achieved. If readings are correct on the

thermocouple, recalibrate or replace

Impinger II – 1100-000-A Series (SN 2038615 & Below) Service Manual –Int’l

temperature display.

TROUBLESHOOTING GUIDE

ELECTRIC OVENS

MODEL 1164-000-EA 400/230 VAC 50 HZ. 3 PHASE
REFER TO PROPER SCHEMATIC FOR IDENTIFIED COMPONENTS

SYMPTOM POSSIBLE CAUSE EVALUATION
Oven fan will not run

No control box cooling

No automatic control box
cooling

Control box cooling fan
continues to run

Incoming power supply Check circuit breakers. Reset if required. Call

power company if needed.
Oven cavity hi-limit
thermostat

Fuse, 10 Amp Check, replace if necessary.
Fuse holder Check, replace if necessary.
Control box hi-limit thermostat Check for voltage on both sides of the switch.

Main fan switch With power off, Check continuity between

Main fan motor Check for opens, shorts or grounds. With

Capacitor Check for shorts or grounds.

Check for main fan operation. If not operating,

Cooling fan Line voltage should now be at the cooling fan.

Incoming power supply Check circuit breakers. Reset if required. Call

Oven cavity hi-limit
thermostat

Cooling fan thermostat Check the cooling fan thermostat (thermostat

Cooling fan Line voltage should now be at the cooling fan.

Cooling fan thermostat This normally open thermostat should close at

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.

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° C)

replace thermostat.

switch terminals. Replace as needed.

power off, turn fan blade to check for locked

rotor.

WARNING: Capacitor has a stored charge,

discharge before testing.

refer to “Oven fan will not run”.

If voltage is present, check motor for shorts or

opens. With power off, check for locked rotor.

power company if needed.

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.

closes at 120° F and opens at 100° F). With the

cooling fan thermostat preheated, check for

continuity. If switch is open, replace thermostat.

If voltage is present, check motor for shorts or

opens. With power off, check for locked rotor.

120°F (48.9°C) and reopen at 100°F (37.8°C).

Replace as needed.

Impinger II – 1100-000-A Series (SN 2038615 & Below) Service Manual –Int’l

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