Lincoln Impinger Conveyor Ovens 1450, Impinger Conveyor Ovens 1451 User Manual

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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: (800) 374-3004

U.S. Fax: (888) 790-8193 • Int’l Fax: (260) 436-0735

Technical Service Hot Line

(800) 678-9511

www.lincolnfp.com

1450digservice

REV 1/30/08

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

CONTROL BOX AUTO COOL DOWN

MAIN FAN CIRCUIT

BURNER CIRCUIT

IGNITION CONTROL

TEMPERATURE CONTROL

CONVEYOR DRIVE

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.

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).

Electrical power is permanently supplied, through a 10 Amp fuse, to the 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.

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

When the ignition control is supplied with 24VAC, the pilot valve and spark igniter are energized. Ignition should now occur. After the pilot flame is proven, the main valve is energized.

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

Closing the oven power switch supplies 120VAC to the conveyor 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 conveyor motor is not running, “BELT JAM” is indicated on the display.

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Impinger I – 1450 Series Service Manual - Domestic

Lincoln Impinger Conveyor Ovens 1450, Impinger Conveyor Ovens 1451 User Manual

SCHEMATIC DIAGRAM

MODEL 1450, 1451

SERIAL NUMBER N28654 AND ABOVE

Impinger I – 1450 Series Service Manual - Domestic

3

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

Incoming power supply

Check circuit breaker, reset if required. Check power

box cooling

 

plug to be sure it is firmly in receptacle. Measure

 

 

incoming power. Call power co. if needed.

 

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. If

 

 

thermostat is open, replace cooling fan thermostat.

Control box cooling

Cooling fan thermostat

See “Cooling fan thermostat” (NOTE: Thermostat will

fan continues to run

 

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”.

 

Gas supply

Check for adequate gas supply to oven.

 

Centrifugal switch of main fan

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.

 

Burner blower motor

Check for 120VAC supplied to burner blower motor. If

 

 

no voltage is present, trace wiring back to primary of

 

 

control transformer. If voltage is present and motor is

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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

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

 

blower motor

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

Control transformer

Check for 120VAC supply to the primary of the control

main flame

 

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

5

 

 

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

The main fan motor and burner blower motor are

 

and burner blower motors

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,

NOTE: Display will indicate

 

but there is no speed

“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.

Impinger I – 1450 Series Service Manual - Domestic

7

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

1 1/2 INCH

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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Impinger I – 1450 Series Service Manual - Domestic

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