Lincoln Impinger Conveyor Ovens 1421-000-E, Impinger Conveyor Ovens 1454, Impinger Conveyor Ovens 1455 User Manual

SERVICE MANUAL

(INTERNATIONAL)

IMPINGER CONVEYOR OVENS

MODEL 1421-000-E, 1454, 1455

WITH PUSH BUTTON CONTROLS

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

1450ExpElect REV 1/30/08

SEQUENCE OF OPERATION

IMPINGER ADVANTAGE

SERIAL NUMBER N28654 AND ABOVE

(OVENS WITH PUSH BUTTON CONTROLS)

MODEL 1421-000-E 230/400 VAC 50 HZ. 3 PHASE

POWER SUPPLY Electrical power is to be supplied to the oven by a five conductor

service.
Brown conductor is hot.
Black conductor is hot.
Black conductor is hot.
Blue conductor is neutral.

Green conductor is ground.
CONTROL BOX AUTO
COOL DOWN

MAIN FAN CIRCUIT Electrical power is permanently supplied through three 50 A fuses to

HEAT CIRCUIT Closing the oven power switch supplies line voltage through the main

TEMPERATURE CONTROL Closing the oven power switch supplies line voltage, through the EMI

CONVEYOR DRIVE Closing the oven power switch supplies line voltage to the conveyor

When the temperature in the control box reaches 120°F ± 3°F (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°F (37°C ± 1.7°C).

the normally open contacts of the hi-limit contactor. Power is also

supplied, through the 10 Amp motor and control fuse, through the

normally closed control box hi-limit thermostat, to the normally open

oven power switch. Power is also supplied to the control box cooling

fan thermostat. Closing the oven power switch supplies line voltage to

the main fan motor. Closing the oven power switch also supplies line

voltage to the heat circuit and to the primary of the oven control

transformer.

fan air pressure switch, through the normally closed oven cavity hi-limit

thermostat, to the oven control

filter, to the primary of the control transformer and through the air

pressure switch and oven cavity hi-limit, to the oven control.

Secondary voltage, 24VAC, is supplied to the oven control. The oven

control is set to desired temperature. The thermocouple will provide

varying millivolts to the oven control. The oven control supplies line

voltage to the heat contactor at intermittent intervals to maintain

desired temperature. The display on the oven control will indicate

when the heat contactor is energized.

NOTE: The display also indicates oven temperature.

motor and to the primary of the control transformer. Secondary

voltage, 24VAC, is supplied to the oven control. Setting the oven

control to the desired time outputs voltage, through a reversing switch,

to the conveyor motor.

NOTE: The conveyor system uses a hall effect sensor and magnet to

prove operation of the conveyor motor. If the motor is not running,

“BELT JAM” is indicated on the display.

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Impinger I -–Adv Digital – Electric Service Manual - International

SEQUENCE OF OPERATION

IMPINGER ADVANTAGE

SERIAL NUMBER N28654 AND ABOVE

(OVENS WITH PUSH BUTTON CONTROLS)

MODEL 1454 220/380VAC 50 HZ. 3 PHASE
MODEL 1455 240/415VAC 50 HZ. 3 PHASE

POWER SUPPLY Electrical power is to be supplied to the oven by a five conductor

service.

Brown conductor is hot.

Black conductor is hot.

Black conductor is hot.

Blue conductor is neutral.

Green conductor is ground.
CONTROL BOX AUTO
COOL DOWN

MAIN FAN CIRCUIT Electrical power is permanently supplied through three 50 A fuses to

HEAT CIRCUIT Closing the oven power switch supplies line voltage through the main

TEMPERATURE CONTROL Closing the oven power switch supplies line voltage to the primary o f

CONVEYOR DRIVE Closing the oven power switch supplies line voltage to the conveyor

When the temperature in the control box reaches 120°F ± 3°F (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°F (37°C ± 1.7°C).

the normally open contacts of the heat relay. Power is also supplied,

through the 10 Amp motor and control fuse, through the normally

closed control box hi-limit thermostat, to the normally open oven power

switch. Power is also supplied to the control box cooling fan

thermostat. Closing the oven power switch supplies line voltage to the

main fan motor. Closing the oven power switch also supplies line

voltage to the heat circuit and to the primary of the oven control

transformer.

fan air pressure switch, through the normally closed oven cavity hi-limit

thermostat, to the oven control

the control transformer and through the air pressure switch and oven

cavity hi-limit, to the oven control. Secondary voltage, 24VAC, is

supplied to the oven control. The oven control is set to desired

temperature. The thermocouple will provide varying millivolts to the

oven control. The oven control supplies line voltage to the heat

contactor at intermittent intervals to maintain desired temperature. The

display on the oven control will indicate when the heat contactor is

energized.

NOTE: The display also indicates oven temperature.

motor and to the primary of the control transformer. Secondary

voltage, 24VAC, is supplied to the oven control. Setting the oven

control to the desired time outputs voltage, through a reversing switch,

to the conveyor motor.

NOTE: The conveyor system uses a hall effect sensor and magnet to

prove operation of the conveyor motor. If the motor is not running,

“BELT JAM” is indicated on the display.

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SCHEMATIC DIAGRAM

MODEL 1421-000-E,

SERIAL NUMBER N28654 AND ABOVE

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SCHEMATIC DIAGRAM

MODEL 1454, 1455

SERIAL NUMBER N28654 AND ABOVE

TROUBLESHOOTING GUIDE

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IMPINGER ADVANTAGE ELECTRIC OVENS

SERIAL NUMBER N28654 AND ABOVE

(OVENS WITH PUSH BUTTON CONTROLS)

SYMPTOM POSSIBLE CAUSE EVALUATION
Oven fan will not run Incoming power supply Check circuit breaker, reset if required. Check power

plug to be sure it is firmly in receptacle. Measure

incoming power, call power co. if required.
Fuse, 10 Amp Check, replace if necessary.
Fuse holder Check, replace if necessary.
Thermostat, control

box hi-limit

Terminals are normally closed, open at 130°F (55°C). If

open, reset and test for proper operation. If thermostat

will not hold, and control box temperature is not

exceeding 130°F (55°C), replace thermostat.
Switch, oven power Check for line voltage supplied to switch. If no voltage is

present, trace wiring back to fuse holder. Check

continuity between switch terminals. Replace switch as

needed.
Motor, main fan Check for line voltage supplied to motor. If no voltage is

present, trace wiring back to oven power switch. Check

motor for opens, shorts or grounds.

WITH POWER OFF: Turn fan blade to check for locked

rotor.
No control box cooling Incoming power supply Check circuit breaker, reset if required. Check power

plug to be sure it is firmly in receptacle. Measure

incoming power, call power co. if required.
Fuse, 10 Amp Check, replace if necessary.
Fuse holder Check, replace if necessary.
Switch, oven power Check for line voltage supplied to switch. If no voltage

is present, trace wiring back to fuse holder. Check

continuity between switch terminals. Replace switch as

needed.
Cooling fan Check for supply voltage to the cooling fan. If no

voltage is present, trace wiring back to the fuse holder.

If voltage is present and motor does not run, check

motor for opens shorts or grounds.

WITH POWER OFF: Check for locked rotor.
No automatic control
box cooling

Incoming power supply Check circuit breaker, reset if required. Check power

plug to be sure it is firmly in receptacle. Measure

incoming power, call power co. if required.
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
Control box cooling fan
continues to run

Cooling fan thermostat See “Cooling fan thermostat” (NOTE: Thermostat will

remain closed if control box temperature remains above

120°F.
Oven will not heat Main fan If not operating, refer to “Oven fan will not run”
Air pressure switch Check air switch terminals for supply voltage to

terminals NO and COM. If voltage is present on one side

only, check for air tube blockage or misalignment. If

these are okay, adjust air pressure switch or replace

switch as needed.
Oven cavity hi-limit

thermostat

Terminals are normally closed, opens at 660°F (350°C).

If open, reset and test oven for proper operation. If

thermostat will not hold for maximum temperature, and

oven is not exceeding control setting, check for proper

location of the capillary bulb in its spring holder. If above

checks are okay, replace hi-limit thermostat.
Control transformer Check for supply voltage to primary of control

transformer. If no voltage is present, trace wiring back to

oven power switch. If voltage is present, check for

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24VAC at transformer secondary. If there is primary

voltage, but no secondary voltage, replace control

transformer.
Oven control Check for 24VAC supply to oven control. If no voltage is

present, trace wiring back to control transformer. Check

for supply voltage to oven control. If no voltage is

present, trace wiring back to hi-limit thermostat. If

voltage is present, check for a read-out on the display. If

there is no read-out on the display, replace oven control.

If there is a read-out on the display, set the oven control

to maximum temperature (see installation operations

manual for temperature adjustment). With the oven

control at maximum temperature, check for supply

voltage to the heat contactor. If there is voltage at the

heat contactor, proceed to “Heat contactor “. If there is

no voltage at the heat contactor, trace wiring back to the

oven control. If there is no voltage output at the oven

control, check the read-out on the oven control. If the

oven control reads “PROBE FAIL” this indicates that the

thermocouple has failed or become disconnected from

the oven control
Contactor, hi-limit (Model

1421-000-E only)

Check for supply voltage to contactor coil. If no voltage

is present, trace wiring back to oven cavity hi-limit

thermostat. If supply voltage is present at the coil, check

to see that contacts are closed. If there is voltage to the

coil and the contacts are not closed, replace contactor.
Thermocouple Check to see that the thermocouple is securely

connected to the oven control. If the thermocouple is

connected to the oven control, and the display indicates

“PROBE FAIL”, disconnect the thermocouple from the

oven control and measure the resistance of the

thermocouple. The thermocouple should read approx.

11Ω. If these readings are not achieved, replace the

thermocouple. If these readings are correct, proceed.
Oven control If the thermocouple checks good, but the oven control

display indicates that there is a thermocouple failure,

replace the oven control. If the oven control indicates a

temperature reading, but the oven will not heat, proceed.
Thermocouple WITH POWER ON AND THERMOCOUPLE

ATTACHED TO THE OVEN CONTROL: Measure the

DC millivolt output of the thermocouple. Refer to the

thermocouple chart (located in the “Removal” section of

the manual) for proper millivolt readings. If these

readings are not achieved, replace thermocouple.
Oven control If the thermocouple checks good, but there is no supply

voltage output to the temperature regulation valve,

replace the oven control. If there is supply voltage output

to the heat contactor, proceed.
Heat contactor Check for supply voltage to the heat contactor. If voltage

is present, listen for contacts to open and close. Also

check for opens or shorts in the operating coil. Replace

heat contactor as needed.
Intermittent heating Thermal/overload of main fan

motor

The main fan motor is equipped with internal thermal

protection and will cease to operate if overheating

occurs. As the motor overheats and cool, this will cause

the heating system to cycle on and off intermittently.

Improper ventilation or lack of preventive maintenance

may cause this problem. Also most of the problems

listed under “Oven will not heat” can cause intermittent

failure.
Conveyor will not run Incoming power supply Check circuit breaker, reset if required. Check power

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plug to be sure it is firmly in receptacle. Measure

incoming power, call power co. if required.
Fuse, 10 Amp Check, replace if necessary.
Fuse holder Check, replace if necessary.
Switch, oven power Check for line voltage supplied to switch. If no voltage

is present, trace wiring back to fuse holder. Check

continuity between switch terminals. Replace switch as

needed.
Control transformer Check for supply voltage to primary of control

transformer. If no voltage is present, trace wiring back to

oven power switch. If voltage is present, check for

24VAC at transformer secondary. If there is primary

voltage, but no secondary voltage, replace control

transformer.
Conveyor motor Check for supply voltage to the conveyor motor at

terminal #8 to neutral. If no voltage is present, trace

wiring back to oven power switch. If voltage is present,

but the motor will not run, check the motor windings for

opens or shorts. If any of the above checks fail, replace

conveyor motor.
Capacitor, conveyor motor Check for shorts or grounds. Replace capacitor as

needed.

WARNING: Capacitor has a stored charge, discharge

before testing.
Switch, conveyor reversing Check continuity between switch terminals. Replace

switch as needed.
Oven control If there is voltage supplied to the motor, and the motor

capacitor and reversing switch check good, replace the

oven control.
Conveyor motor runs,
but there is no speed
display
Oven control Check for output voltage from oven control to hall effect

Conveyor motor If there is voltage supplied to the hall effect sensor,

Oven control If the hall effect sensor readings are correct, but there is

NOTE: Display will indicate
“BELT JAM”

REMOVAL, INSTALLATION & ADJUSTMENTS

sensor (sensor is located in the 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 oven control. If

there is no voltage output at the oven control, replace

oven control.

check for a frequency output from the hall effect sensor.

Measure frequency across the yellow and white wires in

the motor connector. Frequency reading should be

approx. 25-100 Hz. If these readings are not achieved,

replace conveyor motor. If the readings are achieved,

proceed.

no speed indicated on the display, replace the oven

control.

IMPINGER ADVANTAGE SERIES

CAUTION!
BEFORE REMOVING OR INSTALLING ANY COMPONENT IN THE IMPINGER
OVEN BE SURE TO DISCONNECT ELECTRICAL POWER AND GAS SUPPLY

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Impinger I -–Adv Digital – Electric Service Manual - International