Sigma 1433-000-E, 1434-000-E, 1456 User Manual

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 : [phone]

U.S. Fax: [phone] • Int’l Fax: [phone]

Technical Service Hot Line

[phone]

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
COOL DOWN

MAIN FAN CIRCUIT Electrical power is permanently supplied, through the 10 Amp oven

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

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

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

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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).

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.

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

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.

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.

Impinger I – Adv Digital – Gas Service Manual – International

SCHEMATIC DIAGRAM

MODEL 1433-000-E, 1434-000-E

SERIAL NUMBER N28654 TO N31348

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SCHEMATIC DIAGRAM

MODEL 1456, 1457

SERIAL NUMBER N28654 TO N31348

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Impinger I – Adv Digital – Gas Service Manual – International

SCHEMATIC DIAGRAM

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

SERIAL NUMBER N31349 AND ABOVE

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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
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”
S/N N31348 and
Below

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 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

thermostat

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

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 re- try. 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

pressure switch

Check for supply voltage switching to terminal NO as the

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

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not stay on, check the reset button for the ignition

Check for visible damage to the igniter/sensor assembly.

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

thermostat

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

pressure switch

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

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
no main flame

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.

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.

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