Lincoln 1457, 1433-000-E, 1434-000-E, 1456 User Manual

4.5 (4)

SERVICE MANUAL

(INTERNATIONAL)

IMPINGER CONVEYOR OVENS

MODEL 1433-000-E, 1434-000-E, 1456, 1457

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

1450digexport

REV 1/5/07

SEQUENCE OF OPERATION

IMPINGER ADVANTAGE

SERIAL NUMBER N28654 AND ABOVE (OVENS WITH PUSH BUTTON CONTROLS)

MODEL 1433-000-E

230VAC

50 HZ.

NAT. GAS

MODEL 1434-000-E

230VAC

50 HZ.

LP GAS

MODEL 1456

 

220/240VAC

50 HZ.

NAT. GAS

MODEL 1457

 

220/240VAC

50 HZ.

LP 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

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

COOL DOWN

± 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).

MAIN FAN CIRCUIT

Electrical power is permanently supplied, through the 10 Amp oven

 

fuse, to a normally open contact of the oven power switch. Power is

 

also supplied to the control box cooling fan. 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.

BURNER CIRCUIT

Closing the oven power switch supplies line voltage through the main

 

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

 

thermostat. Through the gas pressure proving switch (gas pressure

 

switch removed at S/N N31348) 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 between 30 and 60

 

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

 

Ignition should now occur

 

TEMPERATURE CONTROL

Closing the oven fan switch supplies line voltage to the primary of the

 

control transformer and through the ignition control, 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 temperature regulation valve at intermittent intervals

 

to maintain desired temperature. The display on the oven control will

 

indicate when the temperature regulation valve is energized.

 

NOTE: The display also indicates oven temperature.

CONVEYOR DRIVE

Closing the oven power switch supplies line voltage 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 motor is not running,

 

“BELT JAM” is indicated on the display.

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Impinger I – Adv Digital – Gas Service Manual – International

Lincoln 1457, 1433-000-E, 1434-000-E, 1456 User Manual

SCHEMATIC DIAGRAM

MODEL 1433-000-E, 1434-000-E SERIAL NUMBER N28654 TO N31348

Impinger I – Adv Digital – Gas Service Manual – International

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SCHEMATIC DIAGRAM

MODEL 1456, 1457

SERIAL NUMBER N28654 TO N31348

4

Impinger I – Adv Digital – Gas Service Manual – International

SCHEMATIC DIAGRAM MODEL 1433-000-E, 1434-000-E, 1456, 1457

SERIAL NUMBER N31349 AND ABOVE

Impinger I – Adv Digital – Gas Service Manual – International

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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 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.

 

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

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 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

Cooling fan thermostat

See “Cooling fan thermostat” (NOTE: Thermostat will

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”

S/N N31348 and

Gas supply

Check for adequate gas supply and be sure that the

Below

 

manual gas shut off valve is open. Also check flexible

 

 

gas line connection.

 

Air pressure switch

Check air switch terminals for supply voltage to

 

 

terminals NO2 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

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

 

thermostat

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.

 

Gas pressure switch

This switch is located inside the gas valve and should

 

 

close when gas pressure is present.

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Impinger I – Adv Digital – Gas Service Manual – International

 

 

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 the

 

 

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

 

 

4.5 for town gas. Check the filter in the gas valve for

 

 

blockage or damage. If above checks are okay, but

 

 

pressure switch is still not closed, replace gas valve.

 

Ignition control

Check for supply voltage to ignition control at terminal

 

 

#1 and neutral. If no voltage is present, trace wiring back

 

 

to gas pressure switch. If voltage is present, check for

 

 

supply voltage to burner blower motor at terminal #6 and

 

 

neutral. If no voltage is present, wait 30 seconds, reset

 

 

ignition control, and retry. If the above fails, replace

 

 

ignition control.

 

Burner reset switch

Switch is normally open. Check to see that the switch

 

 

closes when reset button is pushed. Replace as needed.

 

Burner blower motor

Check for supply voltage to burner blower motor. If no

 

 

voltage is present, trace wiring back to the ignition

 

 

control.

 

 

WITH POWER OFF: Turn blower wheel to check for

 

 

locked rotor.

 

 

If supply voltage is present and motor does not run,

 

 

replace burner blower motor.

 

Burner blower motor air

Check for supply voltage switching to terminal NO as the

 

pressure switch

air pressure switch closes. Check for air tube blockage

 

 

or misalignment, adjust air pressure switch. If the above

 

 

fails, replace air pressure switch.

 

Spark generator

After a pre-purge time of 30 to 60 seconds after burner

 

 

blower motor starts, check for supply voltage to spark

 

 

generator. If voltage is not present, check burner reset

 

 

switch. If voltage is still not present, replace ignition

 

 

control. If voltage is present, visually check for spark at

 

 

igniter.

 

Igniter/sensor assembly

Check for visible damage to the igniter/sensor assembly.

 

 

If there is no visible damage to the components, and no

 

 

spark, replace the spark generator. If there is visible

 

 

damage to the igniter/sensor assembly, replace. Also

 

 

check for frayed or damaged wires in burner tube.

 

Gas valve

Check for supply voltage to gas valve. If no voltage is

 

 

present, check reset button. Check all connections for

 

 

tightness. If there is still no voltage at the gas valve,

 

 

replace ignition control. If there is voltage present, check

 

 

for gas pressure at gas pressure tap located in gas

 

 

piping. If there is no gas pressure, replace gas valve.

Flame will not stay on

Flame sensor

Check for flame sensor operation, connect a 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.

 

Power supply

Set the temperature to the lowest temperature setting. If

 

 

there is sufficient microamp current, but the flame will

 

 

not stay on, check for proper polarity of the power

 

 

supply.

 

Ignition control

If there is sufficient microamp current, and there is

 

 

proper polarity of the power supply, but the burner will

Impinger I – Adv Digital – Gas Service Manual – International

7

 

 

not stay on, check the reset button for the ignition

 

 

control. If the above check okay, replace ignition control.

Oven will not heat

Main fan

If not operating, refer to “Oven fan will not run”

S/N N31349 and

 

 

Above

 

 

 

Gas supply

Check for adequate gas supply and be sure that the

 

 

manual gas shut off valve is open. Also check flexible

 

 

gas line connection..

 

Air pressure switch

Check air switch terminals for supply voltage to

 

 

terminals COM and NO. 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

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

 

thermostat

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.

 

Ignition control

Check for supply voltage to ignition control at terminal

 

 

#1 and neutral. If no voltage is present, trace wiring back

 

 

to hi-limit thermostat. If voltage is present, check for

 

 

supply voltage to burner blower motor at terminal #8 and

 

 

neutral. If no voltage is present, wait 30 seconds, reset

 

 

ignition control, and retry. If the above fails, replace

 

 

ignition control.

 

Burner reset switch

Switch is normally open. Check to see that the switch

 

 

closes when reset button is pushed. Replace as needed.

 

Burner blower motor

Check for supply voltage to burner blower motor. If no

 

 

voltage is present, trace wiring back to the ignition

 

 

control.

 

 

WITH POWER OFF: Turn blower wheel to check for

 

 

locked rotor.

 

 

If supply voltage is present and motor does not run,

 

 

replace burner blower motor.

 

Burner blower motor air

Check for air pressure switch to be switching from “NC”

 

pressure switch

to “NO”. Check for air tube blockage or misalignment.

 

 

Adjust air pressure switch. If the above fails, replace air

 

 

pressure switch.

 

Ignition control

A pre-purge time of 30 to 60 seconds occurs after

 

 

burner blower motor starts. Check for high voltage spark

 

 

output from the ignition control. If there is no high

 

 

voltage spark output, check reset button for the ignition

 

 

control. If there is still no high voltage output, replace the

 

 

ignition control.

 

Igniter/sensor assembly

Check for visible damage to the igniter/sensor assembly.

 

 

If there is visible damage to the igniter/sensor assembly,

 

 

replace. If there is no visible damage to the components,

 

 

and no spark, replace the igniter/sensor assy. Also

 

 

check for frayed or damaged wires in burner tube.

 

 

Replace components as needed.

 

Ignition control

Gas valve should open as the ignition control generates

 

 

the high voltage spark. Check for supply voltage to pilot

 

 

valve at terminal #5 and neutral. If no voltage is present,

 

 

check reset button for the ignition control. If there is still

 

 

no voltage to the pilot valve, replace ignition control.

 

Gas valve

Check for supply voltage to pilot valve terminal #5 to

 

 

neutral, if there is no voltage, trace wiring back to

 

 

ignition control. If there is supply voltage, connect a

 

 

manometer to the pressure tap fitting on the gas valve. If

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Impinger I – Adv Digital – Gas Service Manual – International

 

 

there is voltage to the pilot valve, but there is no gas

 

 

pressure, replace gas valve.

 

Pilot tube

Check for gas pressure at pilot tube. Disconnect pilot

 

 

tube at burner and connect manometer. If there is no

 

 

gas pressure, check for blockage in pilot tube. Repair or

 

 

replace as needed.

 

Pilot orifice

If there is gas pressure at the pilot tube, check the pilot

 

 

orifice for damage or obstructions. Replace pilot orifice

 

 

as needed.

Flame will not stay on

Flame sensor

To check flame sensor operation, connect a digital

 

 

multimeter (capable of measuring D.C. microamps)

 

 

between the flame sensor wire and the flame sensor

 

 

connection on the ignition control (terminal #13). Flame

 

 

sensor current is to be 0.7 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 D.C. microamp test must be conducted with

 

 

the oven in low flame (bypass) operation.

 

Power supply

Set the temperature to the lowest temperature setting. If

 

 

there is sufficient microamp current, but the flame will

 

 

not stay lit, check for proper polarity of the power supply.

 

Ignition control

If there is sufficient microamp current, and there is

 

 

proper polarity of the power supply, but the burner will

 

 

not stay lit, check the reset button for the ignition control.

 

 

If the above test is okay, replace the ignition control.

 

NOTE: Flame should be on at

 

 

this time

 

Low flame is on, but

Control transformer

Check for supply voltage to primary of control

no main flame

 

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.

 

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 ignition control. 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 temperature regulation valve. If there is

 

 

voltage at the temperature regulation valve, proceed to

 

 

“Temperature regulation valve “. 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

 

 

oven control reads “PROBE FAIL” this indicates that the

 

 

thermocouple has failed or become disconnected from

 

 

the oven control

 

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.

Impinger I – Adv Digital – Gas Service Manual – International

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