Lincoln 1474, 1480 User Manual

SERVICE MANUAL

(DOMESTIC AND INTERNATIONAL)

IMPINGER CONVEYOR OVENS

MODEL 1400 SERIES ADVANTAGE

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

1450DomExptSvc REV: 6/11/09

TABLE OF CONTENTS

TABLE OF CONTENTS..........................................................................................................................................................2

SEQUENCE OF OPERATION................................................................................................................................................ 4

MODEL 1450 / 120 VAC / 60 HZ / NATURAL GAS ........................................................................................................4

MODEL 1451 / 120 VAC / 60 HZ / LP GAS.....................................................................................................................4

MODEL 1480 / 120 VAC / 60 HZ / TOWN GAS..............................................................................................................4

SEQUENCE OF OPERATIONS .............................................................................................................................................4

MODEL 1452 120/208 VAC 3 PHASE 60 HZ................................................................................................................4

MODEL 1453 120/240 VAC 3 PHASE 60 HZ................................................................................................................4

SEQUENCE OF OPERATIONS .............................................................................................................................................5

MODEL 1454 / 380/220 VAC / 50 HZ / 3 PHASE ...........................................................................................................5

MODEL 1455 / 415/240 VAC / 50 HZ / 3 PHASE ...........................................................................................................5

SEQUENCE OF OPERATIONS .............................................................................................................................................6

MODEL 1456 / 220-240 VAC / 50 HZ / NATURAL GAS.................................................................................................6

MODEL 1457 / 220-240 VAC / 50 HZ / L.P. GAS ...........................................................................................................6

MODEL 1474 / 220-240 VAC / 50 HZ / NATURAL GAS.................................................................................................6

MODEL 1475 / 220-240 VAC / 50 HZ / L.P. GAS ...........................................................................................................6

MODEL 1476 / 220-240 VAC / 50 HZ / TOWN GAS.......................................................................................................6

SCHEMATIC 1450 / 1451 / 1480............................................................................................................................................7

SCHEMATIC 1452 / 1453.......................................................................................................................................................8

SCHEMATIC 1454 / 1455.......................................................................................................................................................9

SCHEMATIC 1456 / 1457.....................................................................................................................................................10

SCHEMATIC 1474 / 1475 / 1476..........................................................................................................................................11

TROUBLESHOOTING GUIDE..............................................................................................................................................12

GAS OVENS..................................................................................................................................................................12

TROUBLESHOOTING GUIDE..............................................................................................................................................19

ELECTRIC OVENS........................................................................................................................................................19

REMOVAL INSTALLATION & ADJUSTMENTS..................................................................................................................22

CONVEYOR CONTROL BOARD ASSEMBLY - REPLACEMENT...............................................................................28

GENERAL – 1450 SERIES..........................................................................................................

GENERAL - 1450 SERIES BLOW-UP..................................................................................................................................31

CONTROL BOX – 1450, 1451, 1480....................................................................................................................................32

CONTROL BOX – 1450, 1451, 1480 BLOW-UP..................................................................................................................33

CONTROL BOX – 1452, 1453..............................................................................................................................................34

CONTROL BOX – 1452, 1453 BLOW-UP............................................................................................................................35

CONTOL BOX – 1454, 1455.................................................................................................................................................36

CONTROL BOX – 1454, 1455 BLOW-UP............................................................................................................................37

CONTROL BOX – 1456, 1457, 1474, 1475, 1476................................................................................................................ 38

CONTROL BOX – 1456, 1457, 1474, 1475, 1476 BLOW-UP..............................................................................................39

OVEN BACK, GAS – ELECTRIC.......................................................................................................................................... 40

OVEN BACK, GAS – ELECTRIC BLOW-UP........................................................................................................................41

CONVEYOR – 1450 SERIES ...............................................................................................................................................42

CONVEYOR 1450 SERIES BLOW-UP ................................................................................................................................ 43

.........................................30

Impinger I – 1400 Series Advantage Service Manual - Dom & Int’l

SEQUENCE OF OPERATION

MODEL 1450 / 120 VAC / 60 HZ / NATURAL GAS

MODEL 1451 / 120 VAC / 60 HZ / LP GAS

MODEL 1480 / 120 VAC / 60 HZ / TOWN GAS

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

black conductor to white conductor is 120 VAC. The white conductor is neutral. The green

conductor is ground. CONTROL BOX When the temperature in the control box reaches 120°F±3° AUTO COOL DOWN (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 fan when the control box temperature falls to

100°F±3°(37.0°C±1.7°C). MAIN FAN CIRCUIT Electrical power is permanently supplied to the normally open contacts of the double pole

main fan relay, the cooling fan thermostat and the normally open switch. Closing the on/off

switch energizes the coil of the relay through the 3A fuse. The normally open cont acts now

close, energizing the main fan motor through the 10A fuse, and the control box-cooling fan.

Closing the on/off switch also supplies 120 VAC to the burner blower motor, the conveyor

control board and to the normally open centrifugal switch of the main fan motor. BURNER CIRCUIT Closing the on/off switch supplies 120 VAC to the burner blower motor and the normally

open centrifugal switch of the main fan motor. As the fan motor reaches approximately

(900 RPM) the centrifugal switch closes supplying120 VAC to the electronic temperature

control board and the primary of the burner control transformer. The transformer secondary

supplies 24 VAC through the normally open centrifugal switch (inside the burner blower

motor, this switch closes at approximately 1600 RPM) to the burner control. The igniter

circuit is now energized. IGNITION CONTROL When the burner control is supplied with 24 VAC, the pilot valve and spark igniter is

energized. Ignition should now occur, after the pilot flame is proven, the main gas valve is

energized. TEMPERATURE CONTROL

CONVEYOR DRIVE Closing the on/off switch supplies 120 VAC to the conveyor control board. AC volts are

When the centrifugal switch of the main fan motor closes, 120 VAC is applied to the

temperature controller. The temperature dial is adjusted to the desired temperature. The

thermocouple will provide varying millivolts to the temperature controller. The temperature

controller supplies 120 VAC to the solenoid valve (and the yellow cycling lamp on the front

panel) at intermittent intervals to maintain desired temperatures.

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 & 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.

SEQUENCE OF OPERATIONS

MODEL 1452 120/208 VAC 3 PHASE 60 HZ

MODEL 1453 120/240 VAC 3 PHASE 60 HZ

POWER SUPPLY Electrical power is to be supplied to the oven by a 5-conductor service.

Black conductor is hot.

Red conductor is hot.

Orange conductor is hot.

White conductor is dedicated neutral.

Green conductor is ground. CONTROL BOX AUTO COOL DOWN

MAIN FAN CIRCUIT Electrical power is permanently supplied through 6, 50A fuses to the normally open

Impinger I – 1400 Series Advantage Service Manual – Dom & Int’l

When the temperature in the control box reaches 120°F ± 3°, (49°C ± 1.7°C), the cooling

fan thermostat will switch power to the cooling fan. The thermostat will interrupt power to

the cooling fan when the temperature falls to 100°F±3° (37°C ± 1.7°C).

contacts of the mercury contactors. Power is also supplied through 1, 10A fuse to the

normally open contacts of the main fan relay, to the normally open cooling fan thermostat,

and through a 3A fuse to the normally open single pole main fan switch. Closing the main

fan switch supplies 120 VAC to the coil of the main fan relay. The coil of the relay is

energized, the normally open contacts close, energizing the main fan motor and coolin g

fan. Closing the main fan switch also supplies power to the conveyor control and the

centrifugal switch of the main fan motor. HEAT CIRCUIT Closing the on/off switch supplies 120 VAC to the normally open centrifugal switch (inside

the main fan motor). As the motor reaches approximately (900 RPM) the centrifugal switch

closes supplying 120 VAC through the normally closed oven cavity and control box hi-limit

thermostats, to the electronic temperature control board TEMPERATURE CONTROL

When the centrifugal switch (inside the main fan motor) closes, 120 VAC is applied to the

temperature controller. The temperature dial is adjusted to the desired temperature. The

thermocouple will provide varying millivolts to the temperature controller. The temperature

controller supplies 120 VAC to the contactor coils at intermittent intervals (closing the

contactors and supplying 208 or 240 VAC to the heating elements) to maintain desired

temperature. The ready lamp is energized with the contactors. CONVEYOR DRIVE Closing the on/off switch supplies 120 VAC 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 & 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.

SEQUENCE OF OPERATIONS

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

POWER SUPPLY Electrical power is to be supplied to the oven by a 5-conductor service.

Black conductor is hot.

Red conductor is hot.

Orange conductor is hot.

White conductor is dedicated neutral.

Green conductor is ground CONTROL BOX AUTO COOL DOWN

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

HEAT CIRCUIT Upon closure of the on/off switch 120 VAC is supplied through the air pressure switch,

TEMPERATURE CONTROL

CONVEYOR DRIVE Closing the on/off switch supplies 120 VAC to the conveyor control board. AC volts are

When the temperature in the control box reaches 120°F ± 3°, (49°C ± 1.7°C), the cooling

fan thermostat will switch power to the cooling fan. The thermostat will interrupt power to

the cooling fan when the temperature falls to 100°F ± 3° (37°C ± 1.7°C).

contacts of the mercury contactor. Power is also supplied through 1, 10A fuse to the

normally open contacts of the main fan relay, to the normally open cooling fan thermostat,

through a 3A fuse to the normally open single pole main fan switch. Closing the main fan

switch supplies 220/240 VAC to the primary of the control circuit step down transformer.

(The transformer steps the voltage down to 120 VAC for the control circuit.) 120 VAC is

supplied to the coil of the main fan relay. The coil of the relay is energized, the normally

open contact close, energizing the main fan motor and cooling fan. Closing the main fan

switch also supplies power to heat and conveyor control.

through the normally closed oven cavity and control box hi-limit thermostats to the

electronic temperature control.

When 120 VAC is supplied to the temperature controller and the temperature dial is

adjusted to the desired temperature, the thermocouple will provide varying millivolts to the

temperature controller. The temperature controller supplies 120 VAC to the contactor coil

at intermittent intervals, (closing the contactor and supplying 220 or 240 VAC to the heating

elements) to maintain desired temperature.

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 & 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. 4

Impinger I – 1400 Series Advantage Service Manual - Dom & Int’l

SEQUENCE OF OPERATIONS

MODEL 1456 / 220-240 VAC / 50 HZ / NATURAL GAS

MODEL 1457 / 220-240 VAC / 50 HZ / L.P. GAS

MODEL 1474 / 220-240 VAC / 50 HZ / NATURAL GAS

MODEL 1475 / 220-240 VAC / 50 HZ / L.P. GAS

MODEL 1476 / 220-240 VAC / 50 HZ / TOWN GAS

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

Brown conductor is hot.

Blue conductor is neutral.

Green conductor is ground. CONTROL BOX AUTO

COOL DOWN

MAIN FAN CIRCUIT Electrical power is permanently supplied to the normally open contacts of the double pole

BURNER CIRCUIT Closing the oven fan switch supplies line voltage through the main fan air pressure switch,

TEMPERATURE CONTROL

CONVEYOR DRIVE Closing the on/off switch supplies 120 VAC (through the step down transformer) to the

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).

main fan relay, the cooling fan thermostat and, through a 3A fuse to the normally open

double pole main fan switch. Closing the oven fan switch supplies line voltage to the

primary of the control circuit step down transformer. The transformer steps the voltage

down to 120 VAC for the control circuit. 120 VAC is supplied to the coil of the double pole

main fan relay. The coil of the relay is energized. The normally open contacts now close,

energizing the main fan motor through one 10A fuse, and the cooling fan motor.

through the gas pressure proving switch, through the normally closed Hi-Limit Thermostat,

to the ignition control. The combustion motor is now energized The normally open

combustion air switch closes upon sensing air. After a pre-purge period of between 30 and

60 seconds, the spark generator and the main gas valve are energized. Ignition should

now occur, after proving, gas control relay is energized.

Closing the oven power switch supplies 120 VAC (through the step-down transformer) to

the temperature control board. The temperature dial is adjusted to desires temperature.

The thermocouple will provide varying millivolts to the temperature controller. The

temperature controller supplies120 VAC through contact of gas control relay to the

solenoid valve at intervals to maintain desired temperature. The ready lamp is energized

with the solenoid valve (an electronic flame monitor proves main flame operation in the

1474, 1475, 1476 models.)

conveyor 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 & 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.

Impinger I – 1400 Series Advantage Service Manual – Dom & Int’l

SCHEMATIC 1450 / 1451 / 1480

Impinger I – 1400 Series Advantage Service Manual - Dom & Int’l

SCHEMATIC 1452 / 1453

Impinger I – 1400 Series Advantage Service Manual – Dom & Int’l

SCHEMATIC 1454 / 1455

Impinger I – 1400 Series Advantage Service Manual - Dom & Int’l

SCHEMATIC 1456 / 1457

Impinger I – 1400 Series Advantage Service Manual – Dom & Int’l

SCHEMATIC 1474 / 1475 / 1476

Impinger I – 1400 Series Advantage Service Manual - Dom & Int’l

TROUBLESHOOTING GUIDE

GAS OVENS

IMPINGER ADVANTAGE SERIES

SYMPTOM POSSIBLE CAUSE EVALUATION Oven fan will not run NOTE:

No control box cooling

No automatic control box cooling

Control box cooling fan continues to run

Oven will not heat Model 1450-1451

For 1456, 1457, 1475, 1476 See Page 14.

Incoming Power Supply Check breakers, reset if required. Call Power Co. if

needed

(Export Ovens) For some export ovens, there is a control circuit step-

down transformer. This transformer steps down supply voltage to 120 VAC. If main fan will not run, the secondary of this transformer must be checked for 120 VAC output. Check specific oven model

schematic for circuit location. Oven Fan Fuse Check and/or Replace Control Fuse Check and/or Replace Fuse Holder Check and/or Replace Fan Switch Check continuity between switch terminals Main Relay Chec k continuity to 120 VAC coil. Check for power to

relay coil (120VAC). Check for supply voltage to

relay contacts. Visually check for contact pull-in. Fan Motor Check for opens, shorts, or ground. WITH POWER

OFF: Turn Fan Blade to check for locked rotor. Capacitor Check for opens, shorts, or grounds. Main Fan Relay Check for power to main fan relay. Visually check for

contact pull-in. Axial Cooling Fan. Check for power

(120 VAC or 240 VAC, check specific model) to

cooling fan. If voltage is present at the fan motor and

the fan does not run, replace fan assembly. Incoming Power Supply Check breakers/Reset if needed. Check for incoming

power at cooling fan thermostat. 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 switch

is open, replace. Axial Cooling Fan WITH POWER OFF: check for locked rotor. Check

for proper voltage to the cooling fan, if present and

fan does not run, replace the fan. Cooling Fan Thermostat See "Cooling Fan Thermostat" (NOTE: Thermostat

will remain closed if control box temperature

exceeds 120°F) Gas Supply Check for adequate gas supply to oven

Manual Gas Shut-off Valve Check to see that manual shut-off valve is open Main Oven Fan Check if main oven fan is operating. If not, refer to

"Oven fan will not run" on page 11. Centrifugal Switch Check for 120 VAC on both sides of (Main Fan)

switch. If voltage present on one side only, and motor

is running, replace motor. Transformer, 24 VAC Check for 120 VAC to primary of transformer. Check

for 24 VAC from secondary of transformer. If there is

primary voltage, but no secondary voltage, replace

transformer. Burner Blower Motor Check for 120 VAC supply to burner blower motor. If

120 VAC is present and motor does not run, replace

motor. WITH POWER OFF: turn blower wheel to

check for locked rotor.

Impinger I – 1400 Series Advantage Service Manual – Dom & Int’l

Pilot flame but no main flame

Centrifugal Switch of Burner Blower Motor

Check for 24 VAC output from secondary of

transformer. If voltage is present, check for 24 VAC

at pin 6 and ground on ignition control. If the burner

blower motor is running and there is no voltage at pin

6 and the ground on the ignition control, replace the

burner blower motor. Ignition Control Check for 24 VAC supply to the ignition control at pin

6 and the ground. If voltage is present, check for 24

VAC across pin #3 and ground (pilot valve). NOTE:

The Honeywell ignition control has a 30 sec. pre-

purge (Time Delay) built in. If voltage is not present,

replace electronic control package. 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. Place female

terminal of igniter lead approximately 1/8" from

terminal post on ignition control. Spark should jump

the 1/8" gap. If no spark is present, replace ignition

control. NOTE: control will try for ignition for 15

seconds only. No Pilot If the ignition control is supplied with 24 VAC 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 pilot shut-off valve. Pilot Shut-off Valve Check to see that pilot shut-off valve is open (shut-off

valve is located between valve assembly and

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

tube at burner and connect manometer to pilot tube.

If no gas pressure is present, 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, (spark gap .100

in. 2.5 mm). If there is visible damage, replace igniter

assembly. Ignition Control If there is a pilot flame, check for 24 VAC across

terminals #1 and the ground (main valve). If there is

no voltage present, replace the ignition control.

NOTE: The Honeywell ignition control has a 15-sec.

lockout built in. If pilot flame is not proven, turn off

switch, wait 30 sec. and restart. If power is supplied

to terminal #1 but there is no main flame, verify that

the main valve (internal to valve assembly) has

opened. Connect a manometer to the manifold gas

pressure tap located on the back of the valve

assembly. If no gas is present, replace valve

assembly. Check for temperature control set above

300°F. Main Orifice Check for blockage of main orifice. If there is no

blockage to the main orifice, check the temperature

control. Temperature Control (Electronic)

Check for 120 VAC across L1 and L2 on temperature

control board.

Impinger I – 1400 Series Advantage Service Manual - Dom & Int’l

Thermocouple Probe Remove thermocouple leads from the temperature

control board, and measure the millivolt output of

these leads. Refer to charts on page 25 in the

adjustment section for proper readings. Temperature Control Turn temperature control dial to full "on" position.

NOTE: Thermocouple must be connected. Measure

for 120 VAC across terminals "N.O." and Com., if

voltage is not present; replace control. Solenoid Valve If voltage is present at terminals "N.O." and Com.,

check for voltage at solenoid valve. If voltage is

present, listen for valve to open and close. Also,

check for opens and shorts in coil. If solenoid valve is

defective, replace.

Intermittent Heating AS FOLLOWS Both the main fan motor and burner blower motor are

equipped with thermo-protection and will cease to

operate when not cooled properly. This can cause

the units to cycle on and off intermittently. Also, most

of the problems listed under "oven will not heat" can

cause intermittent failures.

For continuing intermittent problems, a series of test lights may be made and installed in the ovens. The lights will allow the customer to advise the service technician a trouble code when the oven fails

The lights should be connected in the following manner: Light#1 attached in 120 VAC line after oven fan switch.

Light #2 attached after 120 VAC contacts of oven motor centrifugal switch Light #3 in 24 VAC Burner Transformer Secondary. Light #4 in 24 VAC at terminal #6 of Ignition control valve. Light #5 in 24 VAC at terminal #3 of Ignition control valve. Light #6 in 24 VAC at terminal #1 of Ignition control valve. CODE: All lights off - lights of main power, main fan off, oven fan switch out. 1 on 2 off 3 off 4 off 5 off 6 off - Oven Motor Centrifugal Switch open 1 on 2 on 3 on 4 off 5 off 6 off - Burner Motor Centrifugal Switch bad. 1 on 2 on 3 on 4 on 5 0ff 6 off - Ignition Control bad 1 on 2 on 3 on 4 on 5 on 6 off - Pilot Shield missing or warped, no flame rectification, Pilot

- Orifice plugged, or Gas Control Valve bad. 1 on 2 on 3 on 4 on 5 on 6 on - Unit still not working Main Orifice plugged, Gas Valve bad,

- Temperature Control bad.

- However, Main Orifice would not be intermittent problem.

Conveyor will not run

Voltage Supply Check incoming voltage supply at line 1 to neutral.

There should be a voltage reading of 120 VAC. If not

present, check breakers. 3 Amp Fuse This control fuse is located on the front panel. Replace

if defective. Fuseholder Check and/or replace. Fan Switch See procedure for checking on page 11. Speed Adjustment Potentiometer

This is a 0 to 10 K ohm, 1 turn potentiometer. With

power off, remove the black and white pot leads from

the motor control board at terminals P1, P2. Place the

meter leads on the black lead (P2) and on the white

lead (P1). 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 through out the 1 turn of the pot. Check

both leads to ground. There should be no continuity to

ground. If any of the above checks fail, replace the

pot.

Impinger I – 1400 Series Advantage Service Manual – Dom & Int’l

DC Motor Control Board Check for 120 VAC input to the control board at

Conveyor Gear Motor If DC voltage is present at A+ and A-and the motor

Conveyor Check for any mechanical mis-alignment . Also check

Conveyor speed

Power Supply Check power supply at the DC control board for the

varying or intermittent

D.C. Motor Control Board Place the test meter probes on terminals A+ and A- .

DC Gearmotor If the DC control board is steady then the problem

Magnet Check to insure that the magnet (cemented to shaft of

Hall Effect Sensor Check for any physical damage to Hall Effect Sensor

MODELS 1456 - 1457-1474-1475-1476

Oven will not heat

Gas Supply Check for adequate gas supply to oven. Manual Gas Shut-Off Valve Check to see that manual shut-off valve is open. Fan Switch Check to see that the fan switch is on. Main Oven Fan Check if main oven fan is operating. If not, refer to

Air Pressure Switch Check for supply voltage on both sides of switch. If

terminals L1 and L2. If not present, check the oven

fan switch and wiring back to 3 amp fuse and then

back to power source if necessary. If 120 VAC is

present at L1 and L2, check both fuses on control

board (4A line) and (1A armature), check the VDC

output at terminals A+ and A-. If 120 VAC is present

at terminals L1 and L2, and DC voltage is present A+

and A-, but motor does not run, check gear motor as

follows.

does not run, first check the mini breaker and then the

conveyor. Refer to the next possible cause. 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. From the top of the motor,

rotate motor shaft to determine if there is a locked

rotor or a locked gear box (use care so magnet and

the H.S. board are not damaged). Replace as needed.

for worn bearings. A conveyor belt that is over

tightened may cause excessive bearing wear and

sometimes, irregular speed.

120 VAC at board terminals L1 and L2

(With speed potentiometer set to maximum speed (

Approx. 2 min.) The meter reading should be

approximately 100 VDC (±3%). The board output is

steady. If the board voltage output is unsteady beyond

limits (±3%) then the board is probably bad. Always

check the speed pot. , be sure it is okay before

changing a board. This test is not always 100%

accurate as this test is not performed at operating

speeds. However, this test is the best method

currently available.

may be the motor or gearbox. Check the brushes in

the motor for excessive arching and/or unusual wear.

Check the motor and gearbox from instruction located

on page 14 under "possible cause" Listing "conveyor

gear motor."

conveyor drive motor) has not been damaged, or

come loose from motor shaft. Replace as needed.

(mounted on conveyor drive motor Check all wiring

and connections for damage. Check all connections

for tightness or proper location and check all wiring for

visible damage. Replace as needed. Connect new

Hall Effect to system and check for steady operation.

"Oven fan will not run."

voltage present on one side only, check for air tube

blockage or misalignment, adjust air switch. Replace

as needed.

Impinger I – 1400 Series Advantage Service Manual - Dom & Int’l

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