Lincoln 1450, 1451 User Manual

SERVICE MANUAL

(DOMESTIC)

IMPINGER CONVEYOR OVENS

MODEL 1450,1451

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

1450digservice REV 1/5/07

SEQUENCE OF OPERATION

IMPINGER ADVANTAGE

SERIAL NUMBER N28654 AND ABOVE

(OVENS WITH PUSH BUTTON CONTROLS)

MODEL 1450 120VAC 60 HZ. NAT. GAS

MODEL 1451 120VAC 60 HZ. LP GAS

POWER SUPPLY Electrical power is supplied to the oven by a three conductor cordset. Voltage

from the black conductor to the white conductor is 120VAC. The white

conductor is neutral. The green conductor is ground.
CONTROL BOX AUTO
COOL DOWN

MAIN FAN CIRCUIT Electrical power is permanently supplied, through a 10 Amp fuse, to the

BURNER CIRCUIT Closing the oven power switch supplies 120VAC to the burner blower motor and

IGNITION CONTROL When the ignition control is supplied with 24VAC, the pilot valve and spark

TEMPERATURE CONTROL Closing the oven fan switch supplies 120VAC to the primary of the control

CONVEYOR DRIVE Closing the oven power switch supplies 120VAC to the conveyor motor and to

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When the temperature in the control box reaches 120°F ± 3° (48.9°C ± 1.7°C),

the cooling fan thermostat will switch power to the control box cooling fan. The

thermostat will interrupt power to the cooling fan when the control box

temperature falls to 100°F ± 3° (37.0°C ± 1.7°C).

normally open contacts of the oven power switch. Power is also supplied to the

normally open control box cooling fan thermostat. Closing the oven power

switch supplies 120VAC to the main fan motor and to the control box cooling

fan. Closing the oven power switch also supplies 120VAC to the burner blower

motor, the primary of the oven control transformer and to the centrifugal switch

of the main fan motor.

to the normally open centrifugal switch of the main fan motor. As the main fan

motor reaches approx.900 RPM, the centrifugal switch closes supplying

120VAC to the oven control and to the primary of the burner transformer. The

transformer secondary supplies 24VAC, through the centrifugal switch of the

burner blower motor, to the ignition control.

igniter are energized. Ignition should now occur. After the pilot flame is proven,

the main valve is energized.

transformer and, through the centrifugal switch of the main fan motor, 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 120VAC to the

temperature regulation valve at intermittent intervals to maintain the desired

temperature. The display on the oven control will indicate when the temperature

regulation valve is energized.

NOTE: The display also indicates oven temperature.

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 conveyor motor is not running, “BELT

JAM” is indicated on the display.

Impinger I – 1450 Series Service Manual - Domestic

SCHEMATIC DIAGRAM

MODEL 1450, 1451

SERIAL NUMBER N28654 AND ABOVE

Impinger I – 1450 Series Service Manual - Domestic

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TROUBLESHOOTING GUIDE

IMPINGER ADVANTAGE GAS 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 needed.
Fuse, 10 Amp Check, replace if necessary.
Fuse holder Check, replace if necessary.
Switch, oven power Check for 120VAC supply 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 120VAC supply to the motor. If no voltage is

present, trace wiring back to the 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 needed.
Fuse, 10 Amp Check, replace if necessary.
Fuse holder Check, replace if necessary.
Switch, oven power Check for 120VAC supply 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 120VAC supply to the cooling fan. If no

voltage is present, trace wiring back to the oven power

switch. If voltage is present and motor does not run,

check for opens, shorts or grounds.

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

Cooling fan thermostat Check cooling fan thermostat (thermostat closes at

Control box cooling
fan continues to run

Oven will not heat Main fan If not operating, refer to “Oven fan will not run”.
Gas supply Check for adequate gas supply to oven.
Centrifugal switch of main fan

Burner blower motor Check for 120VAC supplied to burner blower motor. If

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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 needed.

120°F and opens at 100°F). With cooling fan

thermostat pre-heated, check for continuity. If

thermostat is open, replace cooling fan thermostat.

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

remain closed if control box temperature remains

above 120°F.

Check for 120VAC at wire #5 (input to centrifugal

motor

switch, located at 6-pin connector inside motor cover

near main fan motor) to neutral. If no voltage is present,

trace wiring back to oven power switch. If voltage is

present, check for 120VAC at wire #9 (output of

centrifugal switch) to neutral. If no voltage is present at

wire #9, and the motor is running, replace the main fan

motor.

no voltage is present, trace wiring back to primary of

control transformer. If voltage is present and motor is

Impinger I – 1450 Series Service Manual - Domestic

not running, check for opens, shorts or grounds.

WITH POWER OFF: Turn motor to check for locked

rotor. Replace burner blower motor as needed.
Burner transformer Check for 120VAC supplied to primary of burner

transformer. If no voltage is present, trace wiring back

to centrifugal switch of main fan motor. If voltage is

present, check for 24VAC supply at transformer

secondary. If there is primary voltage but no secondary

voltage, replace burner transformer.
Centrifugal switch of burner

blower motor

Check for 24VAC at motor connector, wire #19 (input to

centrifugal switch) to neutral. If no voltage is present,

trace wiring back to burner transformer. If voltage is

present, check for 24VAC at wire #20 (output of

centrifugal switch) to neutral. If no voltage is present at

wire #20 and motor is running, replace burner blower

motor.
Ignition control Check for 24VAC supply to the ignition control. If no

voltage is present, trace wiring back to centrifugal

switch of burner blower motor. If voltage is present,

check for 24VAC at pin #3 and ground (pilot valve).

NOTE: The Honeywell ignition control has a 30 second

pre-purge (time delay) built in. If voltage is not present,

replace ignition control. If the pilot valve is energized,

check to see that the high voltage igniter circuit is also

energized. To check, disconnect the igniter lead from

the ignition control.
No pilot flame If the ignition control is supplied with 24Vac and the

pilot valve (internal to valve assembly) and igniter

circuits are energized, visually check for pilot flame.

This may be done by opening the small inspection door

on the end of the burner, or by opening the main oven

door and looking under the lower finger housings on

the right side of the oven. If no pilot flame is visible,

check the pilot shut-off valve.
Pilot shut-off valve Check to see that the pilot shut-off valve is open (shut-

off valve is located between valve assembly and

burner).
Pilot tube Check for gas pressure at the pilot tube. Disconnect

pilot tube at burner and connect a manometer to pilot

tube. If no gas pressure is present during ignition,

check for blockage in pilot tube or pilot shut-off valve. If

these are clear, and there is gas supplied to the oven,

replace the gas valve.
Pilot orifice If there is gas pressure at the pilot tube, check the pilot

orifice for obstructions. Replace as needed.
Burner igniter Check the burner igniter head for any obstructions, also

check for frayed or broken wire. Check spark gap (gap

should be .100 to .125 inch). If there is visible damage,

replace burner igniter.
NOTE: Flame should be on

at this time
Pilot flame, but no
main flame

Control transformer Check for 120VAC supply to the primary of the control

transformer. If no voltage is present, trace wiring back
to the oven power switch. If voltage is present, check
foe 24VAC at the 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. If
24VAC is present, check for a read-out on the display.
If there is 24VAC supplied, but there is no read-out on

Impinger I – 1450 Series Service Manual - Domestic

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the display, replace oven control. If there is a read-out
on the control, set the control to maximum temperature
(see Installation operations manual for temperature
adjustment). With the control set at maximum
temperature, check for 120VAC at the temperature
regulation valve. If there is voltage at the temperature
regulation valve, proceed to “Temperature regulation
valve” for next check. If there is no voltage at the
temperature regulation valve, 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
control reads “PROBE FAIL”, this indicates that the
thermocouple has failed or become disconnected from
the oven control.

Thermocouple Check to be sure that the thermocouple is securely

connected to the oven control. If the thermocouple is
connected to the oven control, and the control 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

120VAC output to the temperature regulation valve,
replace the oven control. If there is 120VAC output to
the temperature regulation valve, proceed.

Temperature regulation valve Check for 120VAC supplied to the 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 temperature regulation valve as
needed.

Intermittent heating Thermal/overload of main fan

and burner blower motors

The main fan motor and burner blower motor 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 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

plug to be sure it is firmly in receptacle. Measure

incoming power, call power co. if needed.
Fuse, 10 Amp Check, replace if necessary.
Fuse holder Check, replace if necessary.
Switch, oven power Check for 120VAC supply to switch. If no voltage is

present, trace wiring back to fuse holder. Check

continuity between switch terminals. Replace switch as

needed.

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Impinger I – 1450 Series Service Manual - Domestic

Control transformer Check for 120VAC supply to the primary of the control

transformer. If no voltage is present, trace wiring back

to the oven power switch. If voltage is present, check

foe 24VAC at the transformer secondary. If there is

primary voltage, but no secondary voltage, replace

control transformer.
Conveyor motor Check for 120VAC supply to conveyor motor at wire #6

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

oven power switch. If voltage is present and motor will

not run, check the motor windings for opens or shorts.

WITH POWER OFF: Check the motor windings as

follows:

Grey to black - 38Ω approx.

Grey to blue - 38Ω approx.

Blue to black - 75Ω approx.

If any of the above fails, 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 as

needed.
Oven control If there is 120VAC 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

NOTE: Display will indicate

“BELT JAM”
display
Oven control Check for 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 oven control. If there is no
voltage present at the oven control, replace the oven
control.

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

check for a frequency output from the hall effect
sensor. Measure frequency across the yellow and white
wires at the motor connector. Frequency reading
should be approx. 25 – 100 Hz. If these readings are
not achieved, replace 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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REMOVAL, INSTALLATION & ADJUSTMENTS

IMPINGER ADVANTAGE SERIES

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

MOTOR, MAIN FAN - REPLACEMENT

1. Shut off power at main breaker.

2. Remove louvered motor cover from back of oven.

3. Remove wireway by taking out the (5) five hex screws.

4. Disconnect wiring from motor.

5. Remove the twelve (12) hex head bolts from the oven back and slide back straight out of the oven.

6. Remove two (2) bolts 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.

7. Remove the eight (8) hex head bolts from the motor mount and slide the motor assembly out of the oven
back.

8. Remove motor by taking off motor clamp and removing the four (4) mounting nuts and washers.

9. 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: A. Torque specs on bolts (150 in/lb. torque)

B. 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 - REPLACEMENT

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 SPIDER

NOTE: MEASUREMENT MUST BE
MADE FROM CONE TO FAN SPIDER

FAN HUB

CONE

CAPACITOR, MOTOR - REPLACEMENT

1. Shut off power at main breaker.

2. Remove motor cover from back of oven.

3. Discharge capacitor.

4. Remove and replace.

COOLING FAN, CONTROL BOX - REPLACEMENT

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.

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1 1/2 INCH

Impinger I – 1450 Series Service Manual - Domestic