Lincoln Impinger II User Manual

SERVICE MANUAL

(DOMESTIC)

IMPINGER CONVEYOR OVENS

IMPINGER II - ADVANTAGE SERIES

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

1100AdvSvc REV 11/4/08

TABLE OF CONTENTS

TABLE OF CONTENTS 2 SEQUENCE OF OPERATIONS 4 SEQUENCE OF OPERATIONS 5 SCHEMATIC 1116-000-A, 1117-000-A 6 SCHEMATIC 1130-000-A / 1131-000-A 7 SCHEMATIC 1132-000-A / 1133-000-A 8 TROUBLESHOOTING GUIDE / GAS OVENS 9 TROUBLESHOOTING GUIDE / ELECTRIC OVENS 14 REMOVAL, INSTALLATION, AND ADJUSTMENT 18 PARTS / GENERAL 26 BLOW UP / GENERAL 27 PARTS / CONTROL BOX 1116-000-A, 1117-000-A 28 BLOW UP / CONTROL BOX – 1116-000-A, 1117-000-A 29 PARTS / CONTROL BOX – 1130-000-A THRU 1133-000-A 30 BLOW UP / CONTROL BOX – 1130-000-A THRU 1133-000-A 31 PARTS / CONVEYOR & DOOR 32 BLOW UP / CONVEYOR & DOOR 33 PARTS / OVEN BACK ASSEMBLY 34 BLOW UP / OVEN BACK ASSEMBLY 35

Impinger II – Advantage Service Manual - Domestic

SEQUENCE OF OPERATIONS

IMPINGER II ADVANTAGE

MODEL 1116-000-A / NATURAL GAS / 120 VAC / 60 HZ / 1 PHASE

MODEL 1117-000-A / L.P. GAS / 120 VAC / 60 HZ / 1 PHASE

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

from the black conductor to the white conductor is 120 VAC. The white conductor is neutral. The green conductor is ground.

CONTROL BOX AUTO When the temperature in the control box reaches 120°F ± 3° (48.9°C ± 1.7°C),

the

COOL DOWN interrupt power to the fans when the control box temperature falls to 100°F ± 3°

(37.8°C ± 1.7°C).

MAIN FAN CIRCUIT Power is permanently supplied, through a 10A fuse, and through a normally

closed control box hi-limit thermostat, to the normally open main fan switch. Power is also supplied to the normally open cooling fan thermostat. Closing the main fan switch supplies 120 VAC to the main fan motor, the cooling fan motor, the primary of the temperature display transformer, the heat and conveyor circuits.

BURNER CIRCUIT Closing the main fan switch supplies 120 VAC to the burner blower motor. 120

VAC is also supplied, through the normally closed oven cavity hi-limit thermostat, the main fan centrifugal switch (this switch closes when main fan reaches approximately 1600 RPM) to the electronic temperature control and to the primary of the burner transformer.

IGNITION CONTROL The ignition control operates on both 24 VAC and 120 VAC. When the control is

energized by 24 VAC from the transformer, 120 VAC is switched by the ignition control to the hot surface ignitor for 45 seconds for the hot surface ignitor warm up. The ignitor glows red, 24 VAC is switched to the gas valve which opens and ignition should now occur.

TEMPERATURE CONTROL When the centrifugal switch of the main fan motor closes, power is applied to the

temperature control. The 1K ohm temperature pot is adjusted to desired temperature. The thermocouple will provide varying millivolts to the temperature controller. The temperature controller supplies 120 VAC to the solenoid valve at intermittent intervals to maintain desired temperature. The heat lamp is energized with the solenoid valve.

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 and 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.

Temperature Display Closing the switch supplies 120 VAC to the primary of the temperature display

transformer. The secondary of this transformer supplies 12 VAC to the temperature display. The thermocouple supplies D.C. millivolts to the temperature display. The display converts this millivolt reading to a temperature reading.

Impinger II –Advantage Service Manual - Domestic

SEQUENCE OF OPERATIONS

1130-000-A / 208V / SINGLE PHASE 1131-000-A / 240V / SINGLE PHASE 1132-000-A / 208V / THREE PHASE 1133-000-A / 240V / THREE PHASE

POWER SUPPLY Electrical power to be supplied to the oven by a three-conductor service on single

phase and a four-conductor service on three phase.

Black conductor is Hot Red conductor is Hot Orange conductor is Hot (Used on 3 phase only) Green conductor is ground.

CONTROL BOX AUTO COOL DOWN When the temperature in the control box reaches 120°F ± 3°F (48.9°F ± 1.7°C),

the cooling fan thermostat will switch power to the cooling fans. The thermostat will interrupt power to the fans when the temperature falls to 100°F ± 3°F (37°C ±

1.7°C).

MAIN FAN CIRCUIT Power is permanently supplied through the 10A fuses, through the normally

closed control box high limit thermostat, to the normally open main fan switch. Power is also supplied to the normally open cooling fan thermostat. Closing the main fan switch supplies 208/240 VAC to the main fan motor, the cooling fan motor, to the primary of the temperature display transformer and to the heat and conveyor circuits.

HEATER CIRCUIT Closing the fan switch supplies 208/240 VAC, through the normally open air

pressure switch (closed by air pressure from the main fan) through the normally closed oven cavity hi-limit thermostat, to the electronic temperature control. The 1K ohm temperature pot is adjusted to desired temperature. The thermocouple will provide varying millivolts to the temperature controller. The temperature control then supplies 208/240 VAC to the coil of the contactor at intermittent intervals to maintain the desired temperature. The heat lamp is energized with the contactor.

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 and 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.

Temperature Display Closing the switch supplies 120 VAC to the primary of the temperature display

Impinger II – Advantage Service Manual - Domestic

SCHEMATIC 1116-000-A, 1117-000-A

Impinger II –Advantage Service Manual - Domestic

SCHEMATIC 1130-000-A / 1131-000-A

Impinger II – Advantage Service Manual - Domestic

SCHEMATIC 1132-000-A / 1133-000-A

Impinger II –Advantage Service Manual - Domestic

TROUBLESHOOTING GUIDE / GAS OVENS

MODEL 1116-000-A NATURAL GAS 120 VAC 60 HZ 1 PHASE MODEL 1117-000-A LP GAS 120 VAC 60 HZ 1 PHASE

SYMPTOM POSSIBLE CAUSE EVALUATION

Oven fan will not run Incoming Power Supply Check breakers, reset it required. Check power plug

to be sure it is firmly in receptacle. Measure incoming power/call power company if needed.

Fuse, 10 Amp Check, replace if necessary. Fuse Holder Check, replace if necessary. Hi Limit Thermostat-Control

Box

Main Fan Motor Check for opens, shorts, or grounds. WITH POWER Capacitor Check for shorts or grounds.

No control box cooling Incoming Power Check main circuit breakers, reset if required, call Main Fan Switch Check continuity between switch terminals

Cooling Fan 120 VAC should now be at the fan motor. If voltage

No automatic control Incoming Power Supply Check circuit breakers, box cooling reset if required. Call the power company if needed. Cooling Fan Thermostat Check the cooling fan thermostat. (Thermostat

Cooling Fan 120 VAC should be at the motor. If voltage is

Oven will not heat Gas Supply Check for adequate gas supply and closed manual

Main Fan If not operating, refer to "Oven fan will not run". High Limit Oven Cavity Terminals are normally closed. If Thermostat open, push in reset button and retest. If thermostat

Centrifugal Switch Check for 120 VAC at lead #9 of Main Fan Motor (located at 6 pin connector in raceway n ear the main

Main Fan Switch Check continuity between switch terminals.

Check for voltage on both sides of the switch. Terminals are normally closed. If open, reset and test oven for proper operation. If thermostat will not hold and control box temperature is not exceeding 140°F (60°), replace thermostat.

OFF turn fan blade to check for locked rotor. WARNING: Capacitor has a stored charge,

discharge before testing. power company if needed.

is present, check motors for shorts or opens. WITH POWER OFF: Check for locked rotor.

closes at 120°F and opens at 100°F). With the cooling fan thermostat preheated, check for continuity. If switch is open, replace.

present, check motor for shorts, opens, or grounds. WITH POWER OFF: check for locked rotor.

gas shut offs. Also, check flexible gas line connection.

will not hold for maximum oven temperature, and oven is not exceeding temperature dial setting, check for proper location of capillary bulb in its spring holder. If above checks okay, replace hi-limit thermostat.

fan motor) to neutral. If no voltage is present, and motor is running, replace motor.

Impinger II – Advantage Service Manual - Domestic

Burner Blower Motor Visually check to see if motor is running. If not,

check for 120 VAC to motor at motor connector (wire #5 and #22). If voltage is not present, trace wiring back to fan switch. If voltage is present and motor is not running, check for opens, shorts, or grounds. Also, WITH POWER OFF: check for locked rotor.

Transformer, Burner Primary is 120 VAC with 24 VAC secondary. If 120

VAC is not present, trace wiring back to Main Fan Centrifugal Switch. If 120 VAC is present, check for 24 VAC at secondary of transformer. If no voltage is present, replace transformer.

Centrifugal Switch of Burner

Blower Motor

Check of 120 VAC at motor connector, on wire #13 to neutral. If voltage is not present, trace wiring back to transformer. If voltage is not present and motor is running, replace the burner blower motor.

Ignition Control 24 volts should be present at 24 volt terminals. If not

present, trace wiring back to centrifugal switch. When 24 VAC is supplied, the control switches 120 VAC from L1 and L2 to the hot surface ignitor. if 120 VAC is not present at L1 and L2, trace wiring

back to fan switch. If 24 VAC and 120 VAC are

present and 120 VAC is not across the hot surface ignitor terminals, replace the ignition control.

Hot Surface Ignitor If 120 VAC is present at hot surface ignitor terminals,

visually check to see that the ignitor is heating. (Ignitor may be viewed through the port glass in end of burner tube.) The ignitor should glow bright red. If the ignitor does not heat, replace the ignitor.

Ignition Control After 45 seconds of hot surface ignitor pre-heat, the

ignition control will switch 24 VAC to the gas control valves. Check for 24 VAC output from ignition control, across terminals marked "valve" and "valve ground". If no voltage is present, replace ignition control.

Gas Control Valves When 24 VAC is supplied to the gas control valve,

the valve should open. Check for gas pressure at the manifold tap located just before the burner. If there is no pressure, check the incoming gas supply to be sure all manual valves are open and flexible gas hose is properly connected. If gas is present and coils of gas valve are energized, the gas valve is probably defective.

Flame will not stay lit Hot Surface Ignitor Six seconds after the gas valve opens, ignition must

occur. if flame is not detected, the ignition control will shut off and lock out. To reset the ignition control, turn off the burner switch for 45 seconds, then turn on the burner switch to retry ignition. The ignition control requires a minimum of 0.8 D.C. microamps. To check flame sensing operation, connect a digital multimeter (capable of measuring D.C. micro-amps) between the "ground" terminal on ignition control and the ground lead.

NOTE: This is a current measurement and the

meter must be connected in series. If these readings are not achieved, replace the hot surface ignitor.

NOTE: The D.C. micro amp test must be conducted

with the oven in low flame (bypass) operation. Turn the temperature control to the lowest setting.

Impinger II –Advantage Service Manual - Domestic

Power Supply If there is sufficient micro-amp current, but the flame

will not stay lit, check for proper polarity of the 120 VAC power supply.

Ignition Control If there is sufficient micro-amp current, and the 120

VAC polarity is correct, but the flame will not stay lit, replace ignition control.

NOTE: Check for proper ground connection on

ignition control.

NOTE: Flame should be lit at

this time. Low flame is on, but no main flame

Temperature Control Check for 120 VAC at terminal #7

to neutral on temperature control. If no voltage, trace voltage back through centrifugal switch and hilimit. Turn the temperature adjustment knob to maximum temperature position and check for 120 VAC at the load terminal #8 and neutral. If 120 VAC is present and unit is not heating, refer to "Temperature Solenoid Valve" for next check. If 120 VAC is not present, proceed.

Thermocouple Probe WITH POWER ON AND THERMOCOUPLE LEADS

ATTACHED TO THE TEMPERATURE CONTROL BOARD: Measure the D.C. millivolt output of these leads. Refer to thermocouple chart in Section D for proper readings. If these readings are not achieved,

replace the thermocouple. Temperature Set Disconnect the potentiometer leads Potentiometer from the board. Place ohm meter test leads on the

blue and green pot leads. Reading should be 1 K

ohms. Place meter leads across the blue and purple

pot leads and rotate knob from high to low. Repeat

on green and purple leads. Check for even rise and

fall of ohms reading to insure that there are no open

or dead spots in the potentiometer. Check each

lead to ground for shorts. Replace pot if it does not

meet the above test. Temperature Solenoid If 120 VAC is present on the Valve temperature control board at load terminal #8 to

neutral, check for voltage at temperature regulation

valve. If voltage is present, listen for valve to open

and close. Also check for opens or shorts in the coil.

Replace as necessary. Intermittent Heating Therm al/Overload of Main Fan

and Burner Blower Motors

The main fan motor and the burner blower motor are

equipped with internal thermal protection and will

cease to operate if over heating occurs. As the

motors overheat and then cool, this will cause the

units to cycle on and off intermittently. This may be

caused by improper ventilation or preventive

maintenance. Also, most of the problems listed

under "Oven will not heat" can cause intermittent

failure. 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. 10 Amp Fuse Check and/or replace. Fuseholder Check and/or replace. Fan Switch See procedure for checking on Page 10.

Impinger II – Advantage Service Manual - Domestic

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 readings should show an even

transition from 0 to 10 K 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. DC Motor Control Board Check for 120 VAC input to the control board at

terminals L1 and L2. If not present, check wiring

back to the oven fan switch. If 120 VAC is present

at L1 and L2, check both fuses on control board (8A

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 at

A+ and A-, but the motor does not run, check gear

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

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. Check

motor brushes. 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 H.S.

board are not damaged). Replace motor as needed. Conveyor Check for any mechanical misalignment. Also,

check for worn bearings. A conveyor belt that is

over tightened will cause excessive bearing wear

and sometimes, irregular speed. Conveyor speed varying or intermittent

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

120 VAC at board terminals L1 and L2. Motor Control Board Place the test meter probes on terminals A+ and A-.

(With speed potentiometer set to maximum speed

(Approximately 2 min.) The meter reading should be

approximately 100 VDC (±3%), if voltage is not

steady within limits, 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. DC Gearmotor If the DC control board is steady then the problem

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 11 under "possible cause" listing

"conveyor gear motor." Magnet Check to insure that the magnet (cemented to shaft

of conveyor drive motor) has not been damaged, or

come loose from motor shaft. Replace as needed. Hall Effect Sensor Check for any physical damage to hall effect sensor

(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.

Impinger II –Advantage Service Manual - Domestic

+ 25 hidden pages