Lincoln Impinger Conveyor Ovens 1633-000-EA Bedienungsanleitung

1600expadv REV: 1/8/07

SERVICE MANUAL

(INTERNATIONAL)

IMPINGER CONVEYOR OVENS

LOW PROFILE 1600 INTERNATIONAL 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

Low Profile – 1600 Advantage Series Service Manual – International

SERVICE AND PARTS MANUAL

1600 INTERNATIONAL ADVANTAGE

SEQUENCE OF OPERATIONS .............................................................................................. 3

SCHEMATIC............................................................................................................................ 5

TROUBLESHOOTING GUIDE ................................................................................................ 6

REMOVAL, INSTALLATION & ADJUSTMENTS.................................................................12

GENERAL PARTS................................................................................................................. 20

ADVANTAGE SERIES.......................................................................................................... 20

CONTROL BOX, RIGHT PARTS...........................................................................................22

CONTROL BOX, LEFT PARTS............................................................................................. 24

OVEN BACK PARTS ............................................................................................................. 26

CONVEYOR PARTS ............................................................................................................. 28

Low Profile – 1600 Advantage Series Service Manual – International 3

SEQUENCE OF OPERATIONS

MODEL 1633-000-EA 230 VAC 50HZ NATURAL GAS

MODEL 1634-000-EA 230 VAC 50HZ L.P. GAS

POWER SUPPLY

Electrical power 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

When the temperature in either one of the control boxes reaches 120°F ±3°(49°C ±1.7°) , the cooling fan

thermostats will switch power to the cooling fans . The thermostats will interrupt power to the cooling fans when

the temperature falls to 100°F ±3°(37°C ±1.7°)

MAIN FAN CIRCUIT

Line voltage is permanently supplied to a normally open contact of the oven power switch. Line voltage is

permanently supplied to the two normally open cooling fan thermostats, a normally open contact of the oven

power relay. Closing the oven power switch supplies line voltage to oven power relay, its contacts now close,

supplying line voltage to the two main fan motors and the two burner circuits. Closing the oven power switch also

supplies line voltage to the control box cooling fans, the temp. display, and the conveyor circuit.

BURNER CIRCUIT

NOTE: This oven utilizes two complete burner/ temperature control systems. The sequence of operations is the

same for each system.

Closing the main fan switch supplies line voltage, through the oven power relay, through a three amp. fuse,

through the gas pressure switch, through the main fan air pressure switch through the oven cavity hi-limit

thermostat, to the ignition control. The combustion motor is energized. The normally open combustion air switch

closes upon sensing air pressure. After a pre-purge period of between 30 and 60 seconds, the ignition

transformer and the main gas valve are energized. Ignition should now occur.

TEMPERATURE CONTROL

Closing the oven power switch supplies line voltage, through the oven power relay, through a three amp. fuse,

through the gas pressure switch, through the main fan air pressure switch through the oven cavity hi-limit

thermostat, to the temperature control board. The 1.0K temperature pot. is adjusted to desired temperature. The

thermocouple will provide varying millivolts to the temperature control. The temperature control supplies line

voltage to the solenoid valve at intermittent intervals to maintain desired temperature.

CONVEYOR DRIVE

Closing the oven power switch supplies line voltage, through the oven power relay, through the electromagnetic

filter to the conveyor control. AC volts are converted to DC volts and are supplied to the conveyor motor at

terminals A+ and A-.

Low Profile – 1600 Advantage Series Service Manual – International

Adjustments 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 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 power switch supplies line voltage to the primary of the temperature display transformer. The

secondary of this transformer supplies 12 VAC to the temperature display. The thermocouple supplies DC

millivolts to the temperature display. The display converts this millivolt reading to a temperature reading.

Low Profile – 1600 Advantage Series Service Manual – International 5

SCHEMATIC MODELS 1633-000-EA AND 1634-000-EA

Low Profile – 1600 Advantage Series Service Manual – International

TROUBLESHOOTING GUIDE

MODEL 1633-000 EA NATURAL GAS 230 VAC 50 HZ 1 PHASE

MODEL 1634-000-EA L.P. GAS 230 VAC 50 HZ 1 PHASE

NOTE: When checking components on left side of unit, be sure to check for proper

connections in power connector, ( marked P. C. on schematic diagram ) located inside

motor cover.

SYMPTOM POSSIBLE CAUSE EVALUATION

Oven fan will Incoming power supply Check breakers/ reset if required

not run call Power company if needed

Oven fan switch Check continuity between

switch terminals.

Thermostat, hi-limit Terminals are normally closed, if

open, reset thermostat and test

oven for proper operation. If it

will not reset, replace thermostat.

Fan fuse Check, replace if necessary.

Fuse holder Check, replace if necessary.

Oven fan relay Check for power to coil of oven

fan relay. If no voltage is present,

trace wiring back to hi-limit thermostat.

Check for supply voltage at terminal

#6 of the relay. If no voltage is present,

trace wiring back to fuse holder. If

voltage is present, at the relay coil, check

to insure the contacts are closing.

Capacitor(s) Check for opens, shorts, or grounds.

Motor (s) Check for opens, shorts, or grounds.

No control box cooling Fan switch (SEE OVEN

Hi-limit FAN WILL

Oven fan relay NOT RUN.)

Cooling fan(s) Supply voltage should now be at these

motors. If voltage is present, check

motor for open, shorts, or grounds.

WITH POWER OFF: check for

locked rotor.

No automatic control Incoming power supply Check circuit breakers, reset if needed.

box cooling Call power company if needed.

Cooling fan thermostats Thermostat closes at 120°F and

opens at 100°F. With the cooling

fan thermostat preheated, check

for continuity. If switch is open, replace.

Cooling fan(s) Supply voltage should now be at these

motors. If voltage is present, check

motor for opens, shorts or grounds.

WITH POWER OFF: Check for

locked rotor.

Oven will not heat Gas supply Check for adequate gas supply to oven.

Manual gas shut off valve Check to see that the manual gas 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 “oven fan will not run”.

NOTE: These ovens utilize 2 complete Burner/Temperature control systems. Each system will

Follow the same troubleshooting sequence.

Fuse, burner 3A. Check, replace if necessary.

Low Profile – 1600 Advantage Series Service Manual – International 7

Fuse holder Check, replace if necessary.

Gas pressure switch Check for supply voltage to neutral

(internal to gas valve) on both sides of switch. If voltage is

present on one side of switch only,

check the following. Check for proper

gas pressure supply to gas valve.(Marked

on oven spec. plate.) Check for proper

adjustment of gas pressure switch.

should be set at 10 Nat., 27 for L.P.

or 4.5 for town gas. Check gas filter in

gas valve for blockage or damage. (See

Adjustment section for location.)

If the above checks OK, but switch is

still not closed replace gas valve.

Oven air pressure switch Check for supply voltage on both sides

of switch. If voltage is present on one

side only, check for air tube blockage.

Adjust air pressure switch. If the above

fails, replace air pressure switch.

Hi-limit thermostat Terminals are normally closed. If open,

reset and test oven for proper operation.

If thermostat will not hold for maximum

oven temperature, and oven is not

exceeding maximum temperature dial

setting, check for proper location of

capillary bulb in its spring holder.

If above checks OK, replace hi-limit.

Ignition control Check for supply voltage to ignition

control at terminal #1 and neutral.

If voltage is not present, trace wiring

back to hi-limit thermostat. Check for

supply voltage at terminal #6 to neutral.

If no voltage is present, wait 30 seconds

and check reset button. If 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.

WITH POWER OFF: Turn blower

wheel to check for locked rotor. If

supply voltage is present and motor does

not run, replace motor.

Burner blower motor Check for supply voltage switching to

Air pressure switch terminal N. O. 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 blower motor starts,

check for supply voltage to spark

generator. If voltage is not present,

Check reset button located on rear of

control box. If voltage is still not

present, replace ignition control.

If voltage is present, visually check

for spark at igniter head.

Igniter/sensor assembly Check for visible damage to igniter/

sensor assembly. If there is no visible

damage to the components, and no spark,

Low Profile – 1600 Advantage Series Service Manual – International

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 there is no voltage present, check

reset button, check all connections for

tightness. If there still is no voltage at

gas valve, replace ignition control.

If there is voltage present, check for

gas pressure at gas pressure tap located

in gas piping at burner manifold.

If there is no gas pressure, replace

gas valve.

Flame will not stay on Flame sensor To check for flame sensor operation,

connect a digital multimeter (capable

of measuring D.C. micro amps) in

series with the flame sensor wire and

ignition control. Sensor current is 3

micro amps D.C. minimum.

NOTE: The D.C. micro amp test must

be conducted with the oven in low

flame (bypass) operation. Turn the

temperature control to its lowest

setting. If these readings are not

achieved, replace igniter/sensor assy.

Also, check for any type of damage to

flame sensor wire and connections.

Ignition control If there is sufficient flame sensor current,

but the burner will not remain ignited,

check the reset button on ignition control.

NOTE: Check for proper polarity of

the power supply. If all of the above

are OK, replace ignition control.

Pilot lamp is on, Temperature control Check for supply voltage across

But no main flame terminals L2 and 240 on temperature

control board. If no voltage is present,

check wiring back to hi-limit thermostat.

Turn the temperature adjustment knob to

the maximum temperature position and

check for supply voltage at the load

terminal #7 and #8. If voltage is present

and unit is not heating, refer to

“temperature regulation valve” for next

check. If voltage is not present, proceed.

Thermocouple probe With power on and thermocouple leads

attached to board, measure the millivolt

out put of the thermocouple. Refer to the

thermocouple chart in section D for

proper readings.

Temperature control WITH POWER OFF: Remove the

Potentiometer potentiometer leads from the temperature

control 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 potentiometer

Low Profile – 1600 Advantage Series Service Manual – International 9

as needed.

Temperature regulation If supply voltage is present on the

valve temperature control board at the load

terminals #7 and #8, 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 if required.

Intermittent heating Thermal overload of The main fan motors and the burner

main fan and burner blower motors are equipped with

blower motors internal thermal protection and will

cease to operate if overheating 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 lack

of preventive maintenance. Also, most

of the problems listed under “Oven

will not heat” can cause intermittent

failure.

Conveyor will not run Power supply Check for supply voltage at terminals

L1 and L2. If voltage is not present,

check breakers.

Fan switch See procedure for checking on page 6.

Fuse, 10 Amp. Check and/or replace.

Fuse holder Check and/or replace.

Filter E.M.I. Check for supply voltage input to

filter. If there is no voltage, trace wiring

back to relay. If there is input voltage,

check for output voltage. If there is

input voltage but no output voltage,

replace filter.

Speed adjustment This is a 0 to 10K ohm, 1 turn

potentiometer potentiometer. With power off, remove

the black and white pot leads from the

conveyor control board at terminals

P1 and P2. Place the meter leads on

black lead (P2) and 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 the one turn of the pot.

Check both leads to ground. There

should be no continuity to ground.

If any of the above fail, replace

the potentiometer.

D.C. motor Check for supply voltage input to

control board the control board at terminals L1 and L2

If not present, check wiring back to

the filter. If supply voltage is present,

check both fuses on the control board

( 8 Amp. line and 1Amp. armature).

Check the D.C. voltage output at

terminals A+ and A-. If A.C. voltage

is at terminals L1 and L2, and no

D.C. voltage is present at A+ and A-,

replace control board. If A.C. voltage is

present and D.C. voltage is present but

the motor will not run, check gear motor

as follows:

Conveyor If D.C. voltage is present at A+ and A-

Low Profile – 1600 Advantage Series Service Manual – International

gear motor 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 gearbox (use care so magnet

and Hall Effect sensor 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 Power supply Check power supply at the D.C. control

or intermittent board for supply voltage 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 100VDC(±3%), if

voltage is not steady within limits,

then the board is usually bad.

Always check the speed potentiometer,

be sure it is OK before changing a

control 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.

D.C. Gearmotor If the D.C. control board is steady,

then the problem may be the motor or

gearbox. Check the brushes in the

motor for excessive arching or

unusual wear. Check the motor and

gearbox from instructions located on

page 9 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 the motor shaft. Replace

as needed.

Hall Effect Check for any physical damage to

Sensor hall effect sensor (mounted on

conveyor drive motor). Check all

wiring and connections for tightness

and proper location. Replace as needed.

Connect new hall effect to system

and check for steady operation.

Temperature display Display transformer Measure the transformer primary

inoperative for supply voltage input. If voltage is

not present, trace wiring back to the

fan relay. If voltage is present,

measure the secondary output of the

transformer. Voltage across terminals

1-3 should be 12-15VAC. Terminals

1-2 and 2-3 should be ½ the voltage

reading from terminals 1-3. If the above

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