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 |
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MODEL 1434-000-E |
230VAC |
50 HZ. |
LP GAS |
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MODEL 1456 |
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220/240VAC |
50 HZ. |
NAT. GAS |
MODEL 1457 |
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220/240VAC |
50 HZ. |
LP GAS |
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POWER SUPPLY |
Electrical power is to be supplied to the oven by a three conductor |
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service. |
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Brown conductor is hot. |
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Blue conductor is neutral. |
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Green conductor is ground. |
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CONTROL BOX AUTO |
When the temperature in the control box reaches 120°F ± 3°F (48.9°C |
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COOL DOWN |
± 1.7°C), the cooling fan thermostat will switch power to the control |
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box cooling fan. The thermostat will interrupt power to the cooling fan |
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when the control box temperature falls to 100°F ± 3°F (37°C ± 1.7°C). |
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MAIN FAN CIRCUIT |
Electrical power is permanently supplied, through the 10 Amp oven |
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fuse, to a normally open contact of the oven power switch. Power is |
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also supplied to the control box cooling fan. Closing the oven power |
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switch supplies line voltage to the main fan motor. Closing the oven |
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power switch also supplies line voltage to the heat circuit and to the |
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primary of the oven control transformer. |
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BURNER CIRCUIT |
Closing the oven power switch supplies line voltage through the main |
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fan air pressure switch, through the normally closed oven cavity hi-limit |
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thermostat. Through the gas pressure proving switch (gas pressure |
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switch removed at S/N N31348) to the ignition control. The combustion |
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motor is now energized, the normally open combustion air switch |
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closes upon sensing air. After a pre-purge period between 30 and 60 |
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seconds, the spark generator and the main gas valve are energized. |
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Ignition should now occur |
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TEMPERATURE CONTROL |
Closing the oven fan switch supplies line voltage to the primary of the |
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control transformer and through the ignition control, to the oven |
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control. Secondary voltage, 24VAC, is supplied to the oven control. |
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The oven control is set to desired temperature. The thermocouple will |
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provide varying millivolts to the oven control. The oven control supplies |
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line voltage to the temperature regulation valve at intermittent intervals |
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to maintain desired temperature. The display on the oven control will |
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indicate when the temperature regulation valve is energized. |
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NOTE: The display also indicates oven temperature. |
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CONVEYOR DRIVE |
Closing the oven power switch supplies line voltage to the conveyor |
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motor and to the primary of the control transformer. Secondary |
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voltage, 24VAC, is supplied to the oven control. Setting the oven |
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control to the desired time outputs voltage, through a reversing switch, |
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to the conveyor motor. |
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NOTE: The conveyor system uses a hall effect sensor and magnet to |
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prove operation of the conveyor motor. If the motor is not running, |
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“BELT JAM” is indicated on the display. |
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Impinger I – Adv Digital – Gas Service Manual – International |
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
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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
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 |
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plug to be sure it is firmly in receptacle. Measure |
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incoming power, call power co. if required. |
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Fuse, 10 Amp |
Check, replace if necessary. |
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Fuse holder |
Check, replace if necessary. |
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Switch, oven power |
Check for line voltage supplied to switch. If no voltage is |
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present, trace wiring back to fuse holder. Check |
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continuity between switch terminals. Replace switch as |
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needed. |
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Motor, main fan |
Check for line voltage supplied to motor. If no voltage is |
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present, trace wiring back to oven power switch. Check |
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motor for opens, shorts or grounds. |
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WITH POWER OFF: Turn fan blade to check for locked |
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rotor. |
No control box cooling |
Incoming power supply |
Check circuit breaker, reset if required. Check power |
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plug to be sure it is firmly in receptacle. Measure |
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incoming power, call power co. if required. |
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Fuse, 10 Amp |
Check, replace if necessary. |
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Fuse holder |
Check, replace if necessary. |
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Switch, oven power |
Check for line voltage supplied to switch. If no voltage |
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is present, trace wiring back to fuse holder. Check |
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continuity between switch terminals. Replace switch as |
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needed. |
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Cooling fan |
Check for supply voltage to the cooling fan. If no |
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voltage is present, trace wiring back to the fuse holder. |
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If voltage is present and motor does not run, check |
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motor for opens shorts or grounds. |
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WITH POWER OFF: Check for locked rotor. |
No automatic control |
Incoming power supply |
Check circuit breaker, reset if required. Check power |
box cooling |
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plug to be sure it is firmly in receptacle. Measure |
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incoming power, call power co. if required. |
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Cooling fan thermostat |
Check cooling fan thermostat (thermostat closes at |
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120°F and opens at 100°F). With cooling fan thermostat |
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pre-heated, check for continuity |
Control box cooling fan |
Cooling fan thermostat |
See “Cooling fan thermostat” (NOTE: Thermostat will |
continues to run |
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remain closed if control box temperature remains above |
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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 |
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manual gas shut off valve is open. Also check flexible |
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gas line connection. |
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Air pressure switch |
Check air switch terminals for supply voltage to |
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terminals NO2 and COM. If voltage is present on one |
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side only, check for air tube blockage or misalignment. If |
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these are okay, adjust air pressure switch or replace |
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switch as needed. |
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Oven cavity hi-limit |
Terminals are normally closed, opens at 350°C (660°F). |
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thermostat |
If open, reset and test oven for proper operation. If |
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thermostat will not hold for maximum temperature, and |
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oven is not exceeding control setting, check for proper |
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location of the capillary bulb in its spring holder. If above |
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checks are okay, replace hi-limit thermostat. |
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Gas pressure switch |
This switch is located inside the gas valve and should |
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close when gas pressure is present. |
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Impinger I – Adv Digital – Gas Service Manual – International |
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WITH POWER OFF: Remove 3 prong plug (on gas |
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valve) and measure continuity between terminals 2 and |
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3. If no continuity, check the following: Proper gas |
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pressure supply to gas valve as marked on the oven |
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specification plate. Check for proper adjustment of the |
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gas pressure switch, 10 for Nat. gas, 27 for LP gas or |
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4.5 for town gas. Check the filter in the gas valve for |
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blockage or damage. If above checks are okay, but |
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pressure switch is still not closed, replace gas valve. |
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Ignition control |
Check for supply voltage to ignition control at terminal |
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#1 and neutral. If no voltage is present, trace wiring back |
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to gas pressure switch. If voltage is present, check for |
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supply voltage to burner blower motor at terminal #6 and |
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neutral. If no voltage is present, wait 30 seconds, reset |
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ignition control, and retry. If the above fails, replace |
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ignition control. |
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Burner reset switch |
Switch is normally open. Check to see that the switch |
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closes when reset button is pushed. Replace as needed. |
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Burner blower motor |
Check for supply voltage to burner blower motor. If no |
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voltage is present, trace wiring back to the ignition |
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control. |
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WITH POWER OFF: Turn blower wheel to check for |
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locked rotor. |
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If supply voltage is present and motor does not run, |
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replace burner blower motor. |
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Burner blower motor air |
Check for supply voltage switching to terminal NO as the |
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pressure switch |
air pressure switch closes. Check for air tube blockage |
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or misalignment, adjust air pressure switch. If the above |
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fails, replace air pressure switch. |
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Spark generator |
After a pre-purge time of 30 to 60 seconds after burner |
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blower motor starts, check for supply voltage to spark |
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generator. If voltage is not present, check burner reset |
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switch. If voltage is still not present, replace ignition |
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control. If voltage is present, visually check for spark at |
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igniter. |
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Igniter/sensor assembly |
Check for visible damage to the igniter/sensor assembly. |
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If there is no visible damage to the components, and no |
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spark, replace the spark generator. If there is visible |
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damage to the igniter/sensor assembly, replace. Also |
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check for frayed or damaged wires in burner tube. |
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Gas valve |
Check for supply voltage to gas valve. If no voltage is |
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present, check reset button. Check all connections for |
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tightness. If there is still no voltage at the gas valve, |
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replace ignition control. If there is voltage present, check |
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for gas pressure at gas pressure tap located in gas |
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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 |
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multimeter (capable of measuring DC microamps) |
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between the flame sensor wire and terminal #1 on the |
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ignition control. Sensor current is to be 3 microamps, |
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minimum. If these readings are not achieved, replace |
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igniter/sensor assembly. Also check for any type of |
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damage to flame sensor wire and connections. |
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NOTE: The DC microamp test must be conducted with |
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the oven in low flame (bypass) operation. |
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Power supply |
Set the temperature to the lowest temperature setting. If |
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there is sufficient microamp current, but the flame will |
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not stay on, check for proper polarity of the power |
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supply. |
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Ignition control |
If there is sufficient microamp current, and there is |
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proper polarity of the power supply, but the burner will |
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not stay on, check the reset button for the ignition |
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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 |
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Above |
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Gas supply |
Check for adequate gas supply and be sure that the |
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manual gas shut off valve is open. Also check flexible |
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gas line connection.. |
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Air pressure switch |
Check air switch terminals for supply voltage to |
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terminals COM and NO. If voltage is present on one side |
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only, check for air tube blockage or misalignment. If |
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these are okay, adjust air pressure switch or replace |
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switch as needed. |
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Oven cavity hi-limit |
Terminals are normally closed, opens at 350°C (660°F). |
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thermostat |
If open, reset and test oven for proper operation. If |
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thermostat will not hold for maximum temperature, and |
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oven is not exceeding control setting, check for proper |
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location of the capillary bulb in its spring holder. If above |
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checks are okay, replace hi-limit thermostat. |
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Ignition control |
Check for supply voltage to ignition control at terminal |
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#1 and neutral. If no voltage is present, trace wiring back |
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to hi-limit thermostat. If voltage is present, check for |
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supply voltage to burner blower motor at terminal #8 and |
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neutral. If no voltage is present, wait 30 seconds, reset |
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ignition control, and retry. If the above fails, replace |
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ignition control. |
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Burner reset switch |
Switch is normally open. Check to see that the switch |
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closes when reset button is pushed. Replace as needed. |
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Burner blower motor |
Check for supply voltage to burner blower motor. If no |
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voltage is present, trace wiring back to the ignition |
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control. |
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WITH POWER OFF: Turn blower wheel to check for |
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locked rotor. |
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If supply voltage is present and motor does not run, |
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replace burner blower motor. |
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Burner blower motor air |
Check for air pressure switch to be switching from “NC” |
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pressure switch |
to “NO”. Check for air tube blockage or misalignment. |
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Adjust air pressure switch. If the above fails, replace air |
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pressure switch. |
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Ignition control |
A pre-purge time of 30 to 60 seconds occurs after |
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burner blower motor starts. Check for high voltage spark |
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output from the ignition control. If there is no high |
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voltage spark output, check reset button for the ignition |
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control. If there is still no high voltage output, replace the |
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ignition control. |
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Igniter/sensor assembly |
Check for visible damage to the igniter/sensor assembly. |
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If there is visible damage to the igniter/sensor assembly, |
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replace. If there is no visible damage to the components, |
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and no spark, replace the igniter/sensor assy. Also |
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check for frayed or damaged wires in burner tube. |
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Replace components as needed. |
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Ignition control |
Gas valve should open as the ignition control generates |
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the high voltage spark. Check for supply voltage to pilot |
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valve at terminal #5 and neutral. If no voltage is present, |
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check reset button for the ignition control. If there is still |
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no voltage to the pilot valve, replace ignition control. |
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Gas valve |
Check for supply voltage to pilot valve terminal #5 to |
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neutral, if there is no voltage, trace wiring back to |
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ignition control. If there is supply voltage, connect a |
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manometer to the pressure tap fitting on the gas valve. If |
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Impinger I – Adv Digital – Gas Service Manual – International |
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there is voltage to the pilot valve, but there is no gas |
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pressure, replace gas valve. |
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Pilot tube |
Check for gas pressure at pilot tube. Disconnect pilot |
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tube at burner and connect manometer. If there is no |
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gas pressure, check for blockage in pilot tube. Repair or |
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replace as needed. |
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Pilot orifice |
If there is gas pressure at the pilot tube, check the pilot |
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orifice for damage or obstructions. Replace pilot orifice |
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as needed. |
Flame will not stay on |
Flame sensor |
To check flame sensor operation, connect a digital |
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multimeter (capable of measuring D.C. microamps) |
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between the flame sensor wire and the flame sensor |
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connection on the ignition control (terminal #13). Flame |
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sensor current is to be 0.7 microamps, minimum. If |
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these readings are not achieved, replace igniter/sensor |
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assembly. Also check for any type of damage to flame |
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sensor wire and connections. |
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NOTE: The D.C. microamp test must be conducted with |
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the oven in low flame (bypass) operation. |
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Power supply |
Set the temperature to the lowest temperature setting. If |
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there is sufficient microamp current, but the flame will |
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not stay lit, check for proper polarity of the power supply. |
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Ignition control |
If there is sufficient microamp current, and there is |
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proper polarity of the power supply, but the burner will |
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not stay lit, check the reset button for the ignition control. |
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If the above test is okay, replace the ignition control. |
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NOTE: Flame should be on at |
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this time |
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Low flame is on, but |
Control transformer |
Check for supply voltage to primary of control |
no main flame |
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transformer. If no voltage is present, trace wiring back to |
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oven power switch. If voltage is present, check for |
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24VAC at transformer secondary. If there is primary |
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voltage, but no secondary voltage, replace control |
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transformer. |
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Oven control |
Check for 24VAC supply to oven control. If no voltage is |
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present, trace wiring back to control transformer. Check |
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for supply voltage to oven control. If no voltage is |
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present, trace wiring back to ignition control. If voltage is |
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present, check for a read-out on the display. If there is |
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no read-out on the display, replace oven control. If there |
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is a read-out on the display, set the oven control to |
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maximum temperature (see installation operations |
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manual for temperature adjustment). With the oven |
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control at maximum temperature, check for supply |
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voltage to the temperature regulation valve. If there is |
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voltage at the temperature regulation valve, proceed to |
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“Temperature regulation valve “. If there is no voltage at |
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the temperature regulation valve, trace wiring back to |
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the oven control. If there is no voltage output at the oven |
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control, check the read-out on the oven control. If the |
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oven control reads “PROBE FAIL” this indicates that the |
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thermocouple has failed or become disconnected from |
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the oven control |
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Thermocouple |
Check to see that the thermocouple is securely |
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connected to the oven control. If the thermocouple is |
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connected to the oven control, and the display indicates |
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“PROBE FAIL”, disconnect the thermocouple from the |
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oven control and measure the resistance of the |
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thermocouple. The thermocouple should read approx. |
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11Ω. If these readings are not achieved, replace the |
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thermocouple. If these readings are correct, proceed. |
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