Liebherr IGN 2556, IGN 2566 freezer Service Manual

Service Documentation

After Sales Service International

Service Manual No. 01/2008

LHG/TKD-Ne/23.10.08

Appliance Documentation

IGN 2556 from Index 20

IGN 2566 from Index 20

NoFrost freestanding freezer

IGN 2556

IGN 2566

1

/

01200800SM_gb.doc

Service Information No. 01/2008

Contents

IGN 2556/2566

1.0

Operating and control elements ............................................................................................... 3

2.0

Functions at a glance ................................................................................................................ 3

3.0

Description of appliance ........................................................................................................... 4

3.1

Sensor positions, schematic diagrams 4

4.0

Main components and their functions ..................................................................................... 5

4.1

Electrical components and functions

4.1.1

General

4.1.2

Freezer compartment

4.2

Refrigeration components and functions

4.2.1

Freezer compartment

8

8

5

5

5

5.0

Assembly instructions / replacement of parts ........................................................................ 9

5.1

General

5.1.1

Electronic control system

5.1.2

Door magnet

9

9

10

5.2

Freezer compartment

5.2.1

Evaporator module

5.2.2

Evaporator sensor

5.2.3

Air sensor

5.2.4

Fan

5.2.5

Temperature fuse

5.2.6

IGN 2566 only, IceMaker

5.2.7

IGN 2566 only, double solenoid valve IceMaker

11

11

12

12

13

14

15

15

6.0

Technical data .......................................................................................................................... 16

6.1

General 16

6.2

Freezer compartment 16

7.0

Service menu............................................................................................................................ 17

7.1

Manual defrosting 17

7.2

Demo mode

7.3

Service mode

7.4

Sensor test (temperature display) and door contact test "E"

17

18

19

8.0

Error code, troubleshooting.................................................................................................... 19

8.1

Table of error codes 19

8.2

Troubleshooting VCC compressor / inverter

8.2.1

Checking the inverter and the frequency signal

8.2.2

Checking the compressor

20

20

21

Page 2/21

Service Information No. 01/2008

1.0 Operating and control elements

1 2

3

1 Up

2 Down

4

Freezer compartment

Setting button temperature higher

Setting button temperature lower

4 ON/OFF

ON/OFF button

6 Alarm

Alarm OFF button for audible alarm

2.0 Functions at a glance

Control:

Electronic

Temperature display:

Temperature range:

Temperature alarm:

Door alarm:

Fan:

Actual value

-14°C to -28°C

Visual, audible

Audible

Present

Defrosting:

Interior light:

Service menu:

Compressor:

Solenoid valve refrigeration circuit:

Automatic

Present

Present

VCC

Not present

5

Page 3/21

6

IGN 2556/2566

3.1

Service Information No. 01/2008

3.0 Description of appliance

IGN 2556/2566

The IGN 2556/2566 is a NoFrost freezer using a series 6 control system with actual value display.

The appliance has a lamellar evaporator with fan and integrated defrost heater. Two sensors, an air sensor and an evaporator sensor, see to the control and automatic defrosting. A safety temperature limiter protects the appliance against excessively high temperatures during the defrosting phase.

The IGN 2566 is equipped with an IceMaker.

Sensor positions, schematic diagrams

Fig. 3.1 / 1

Fan

Foamed-in rear wall evaporator

Evaporator sensor

Air sensor

IGN 2566 only:

IceMaker

Fig. 3.1 / 2

Page 4/21

Service Information No. 01/2008

4.0 Main components and their functions

4.1 Electrical components and functions

4.1.1 General

Electronic control system

Type:

Series 6 electronic control system

Components:

Electronic single-board solution

IGN 2556/2566

Electronic control system

Setting range:

-14°C to -28°C

Display range:

0°C to -49°C

Values outside the range are indicated by a cross bar

Functions

Temperature alarm:

Alarm value: 4K warmer than set value.

Warmest alarm value: -10 °C

Coldest alarm value: -20 °C

Delay:

Visual:

Audible:

Flashing alarm LED

4 beeps (suppressed during start-up)

During start-up: value

The temperature display flashes until the switch-off is reached, the audible alarm is switched OFF.

(e.g. given a set value of -18°C, a temperature of –14°C must be present for at least 20 minutes, then a temperature alarm is raised.)

When the defrosting phase begins, the temperature alarm is suppressed for

1.5

hrs.

Defrosting:

Door alarm:

ON: running time.

- During start-up after 6 hours cumulative compressor

- After a cumulative compressor running time of 10 to 30 hours

maximum, depending on the number/duration of the door

openings.

When the defrosting phase begins, the compressor and the fan are switched OFF and the defrost heater is switched ON.

Duration: The defrost heater remains switched ON until

- the freezer compartment evaporator sensor has reached +32°C

or

- a max. defrosting time of 50 minutes has been reached.

Info:

When:

After the end of the heating phase the compressor is switched ON with a 15-minute delay. Fan ON, from -25°C.

If the SuperFrost function is activated during the defrosting phase, this will not interrupt defrosting.

If door is open, after 60 seconds.

Page 5/21

Service Information No. 01/2008

SuperFrost:

ON:

OFF:

Note:

Sensor

Air sensor:

Position:

Function:

Evaporator sensor:

Position:

Function:

Switch

Door switch:

Behind the front panel of the evaporator module.

- Switches the compressor ON/OFF.

- Generates the display value.

Slipped into the lamellar evaporator.

- Switches the defrost heater OFF (ends the defrosting phase).

- Switches the fan ON/OFF.

Position:

Type:

In front panel

Reed contact

Contact type: Make contact

Function: Activation via: magnet on the door, magnet is replaceable.

Switching signal when:

IGN 2556/2566

Freezer compartment sets itself to -32°C (quantity-controlled, min.

30 hrs., max. 65 hrs.)

The appliance sets itself to -32°C for at least 30 hours. In the following 35 hours cooling by 11K to the set value must have been reached or a total time of 65 hours must have elapsed in order that

SuperFrost is automatically ended.

The freezer compartment sets itself to the set value.

If SuperFrost is actuated during a defrosting phase, the SuperFrost function is not performed before the defrosting phase has run.

Loads

Fan:

Position:

Function:

In the evaporator module, at the back centre.

Evaporator sensor

Compressor Door Fan

Switch-on value

Switch-on value

Switch-on value

Switch-off value

OFF CLOSED

ON CLOSED

OFF/ON OPEN

OFF/ON

CLOSED/

OPEN

OFF

ON

OFF

OFF

e.g. If the evaporator sensor has reached the switch-on value for the fan and the compressor is ON and the door is CLOSED, then the fan is ON.

Switch-on value evaporator sensor: a) During start-up/after defrosting: -25°C b) In the normal mode 2K colder than air sensor

Page 6/21

Service Information No. 01/2008

Defrost heater:

Position: Clipped into lamellar evaporator

IGN 2556/2566

Function: Keeps the evaporator free from ice. Activation via electronic control system.

Defrost heater ON:

- Depending on the number and duration of door openings, the electronic system calculates the defrost cycles between 10-30 hours cumulative compressor running time.

- Upon start-up after 6 hours cumulative compressor running time.

Defrost heater OFF:

-

When the evaporator sensor has reached +32°C

- When max. time of 50 minutes is exceeded.

Heater cannot be replaced

Æonly complete evaporator module!

Compressor:

Type: VCC compressor, frequency-controlled.

Function: ON: Air sensor switch-on value

Note: On-delay time (8 minutes) must have elapsed.

OFF: Air sensor switch-off value.

VCC compressor, frequency-controlled.

• Compressor with 4 different speeds (1600 / 1900 / 3000 / 3600 rpm).

• The inverter electronic control is fitted directly on the compressor. The inverter electronic control controls the compressor with a pulse-width modulated square-wave voltage.

• For speed value input, the inverter electronic module receives a square wave frequency signal from the power PCB.

This frequency signal is output with 56, 71, 87,100 or 117 Hz, depending on the speed at which the compressor is to run.

Frequency in Hz

56

71

87

100,

0 (signal interruption), other values than the defined frequencies

117

Speed in rpm

Compressor OFF

1600

1900

3000

3600

Operation

Compressor OFF

Ideal case

Control mode

Start-up, signal interruption, signal fault

SuperFrost

• Runtime longer than 70 minutes:

Speed increase by one step during compressor operation.

• Runtime shorter than 40 minutes:

Speed reduction on next start-up.

For troubleshooting, see section 8.2 Troubleshooting VCC compressor / inverter

Page 7/21

Service Information No. 01/2008

4.2 Refrigeration components and functions

Compressor

Compressor:

Frame heater

Position:

Evaporator

Type:

Type of installation:

Injection point:

Flow sequence:

IGN 2556/2566

VCC, frequency-controlled

Foamed-in in the housing, in the contact area of the magnetic door seal.

Lamellar evaporator.

In evaporator module on appliance ceiling

Front centre

Front to back

Page 8/21

Service Information No. 01/2008

5.0 Assembly instructions / replacement of parts

5.1 General

5.1.1 Electronic control system

Covers:

Fig. 5.1.1/ 1 Left cover

Front panel:

Disengage covers at the marked points.

Fig. 5.1.1/ 2 Right cover

Unlock locating lugs at the left and right of the front panel.

Fig. 5.1.1/ 3 Left locating lug

PCB carrier:

Fig. 5.1.1/ 4 Right locating lug

Draw the front panel forwards for removal and expose the cables.

Disconnect and detach group connectors.

Fig. 5.1.1/ 5 Group connector

Fig. 5.1.1/ 6 Group connector

IGN 2556/2566

Fig. 5.1.1/ 7 Front panel assembly

Page 9/21

Service Information No. 01/2008

Magnet holder:

IGN 2556/2566

Press marked locating lugs together and detach magnet holder upwardly.

Magnet holder

Fig. 5.1.2 / 1

Page 10/21

Service Information No. 01/2008 IGN 2556/2566

Evaporator module

Locking parts

Remove top drawers

Fig. 5.2.1/ 1 Evaporator module

Locking parts:

Transit support:

Are snapped into place at the right and left for locking the evaporator module.

Remove the adhesive tape as transit support of the "top polystyrene moulding", it is no longer needed for assembly (Fig. 5.2.1/ 3).

Top polystyrene moulding: Lift off the polystyrene moulding first at the front, then at the back.

Draw the "top polystyrene moulding" forwards for removal.

Top polystyrene moulding

Fig. 5.2.1/ 2 Remove locking part

Adhesive tape

Fig. 5.2.1/ 3 Remove adhesive tape

Page 11/21

Service Information No. 01/2008 IGN 2556/2566

Evaporator module: Dismantle the evaporator module as described below under 5.2.1 Evaporator

module.

Evaporator sensor: repaired

Is slipped inbetween the lamellas and in case of defect it has to be cut off and with the repair kit (Art. No. 9590 062).

Temperature fuse

Fig. 5.2.2/ 1 Evaporator module folded down

Evaporator

Evaporator module: Dismantle the evaporator module as described below under 5.2.1 Evaporator

module.

Front polystyrene moulding: Is situated behind the front panel is the evaporator module (is only inserted).

Acts as an air seal of the air sensor in the direction of the lamellar evaporator.

Is engaged behind the front panel of the evaporator module and in case of defect it has to be cut off and repaired with the repair kit (Art. No. 9590 062).

Air sensor:

Fig. 5.2.3/ 1 Removal of the polystyrene Fig. 5.2.3/ 2 Air sensor

Page 12/21

Service Information No. 01/2008

5.2.4 Fan

IGN 2556/2566

Evaporator module: Dismantle the evaporator module as described below under 5.2.1 Evaporator

module.

Fan casing: and

Detach fan connector. Lift the fan casing out of the housing support, swing it down remove it.

Fan casing

Fig. 5.2.4/ 1 Fan casing

Fan:

Fan connector

Fig. 5.2.4/ 2 Fan casing, swung down

Lay the fan casing front face down, and remove the attached sealing rubber at the rear. Detach the fan from the housing.

Fig. 5.2.4/ 3 Fan housing, front face

Fig. 5.2.4/ 5 Fan housing, components

Sealing rubber

Fig. 5.2.4/ 4 Fan housing, rear

Page 13/21

Service Information No. 01/2008 IGN 2556/2566

Evaporator module: Dismantle the evaporator module as described below under 5.2.1 Evaporator

module.

Temperature fuse:

Fastened by a screw.

To be noted for replacement:

- Cut off only at the coloured wires (not heater wire!)

- Fix the wires in such a way that they do not touch the heater.

Screw

Temperature fuse

Fig. 5.2.5/ 1 Temperature fuse

Page 14/21

Fig. 5.2.7 / 1

Service Information No. 01/2008

5.2.6 IGN 2566 only, IceMaker

IGN 2556/2566

Holder:

for

Press the locating lugs in the two openings of the holder inwards and draw the holder forwards removal (see Fig. 5.2.6/ 1).

Reed contact: The reed contact for drawer recognition is situated in the holder.

Draw the IceMaker forwards and lower it for removal. Disconnect the IceMaker cables.

IceMaker:

Holder

Fig. 5.2.6/ 1 Disengaging the holder

Holder with reed contact

Fig. 5.2.6/ 2 Reed contact in holder Fig. 5.2.6/ 3 IceMaker

5.2.7 IGN 2566 only, double solenoid valve IceMaker

Solenoid valve

- Undo marked screw (see Fig. 5.2.7/ 1).

- Remove cover.

- Detach electrical connectors.

- Undo screw fitting of water hose.

Screw fitting of water hose

Double solenoid valve

Fig. 5.2.7 / 2

Electrical connection

Page 15/21

Service Information No. 01/2008

6.0 Technical data

6.1 General

Sensor values:

IGN 2556/2566

Air and evaporator sensors

Temperature °C Resistance value kOhm

+35 3.1

+30 3.8

+25 4.7

+20 5.9

+15 7.3

+10 9.3

+5 11.9

0 15.3

-5 19.8

-10 25.9

-15 34.1

-20 45.3

-25 60.8

-30 82.3

-35 112.8

Fan:

Defrost heater:

Temperature fuse:

Tripping temperature: +93°C

Page 16/21

Service Information No. 01/2008 IGN 2556/2566

The service menu may be used by service technicians only.

Activation of service menu: Press "ON/OFF" + "SuperFrost" simultaneously for about 3 seconds

Once the service menu is activated, the SuperFrost LED flashes.

Step Display Operation

Display following

operation

Service menu start

Press "ON/OFF" and

"SuperFrost" simultaneously for 3 seconds

"H" flashes with

SuperFrost LED

Evaporator must be cold

1

"H" flashes together with SuperFrost LED

Press "SuperFrost"

Manual defrosting is ended: - by switching appliance OFF/ON.

Testing option / Info

Service menu active.

Stepwise manual defrosting. sensor or max. defrosting time 50 minutes)

Step Display Operation

Display following

operation

Testing option / Info

Service menu start

Press "ON/OFF" and

"SuperFrost" simultaneously for 3 seconds

"H" flashes with

SuperFrost LED

Service menu active.

Stepwise manual defrosting.

2

"H" flashes with

SuperFrost LED

Press "Up" once

"d1" or "d0" flashes with SuperFrost

LED

Service menu active.

Stepwise demo mode

3a

d1

3b d0

Press SuperFrost.

Press SuperFrost.

-18°C

Actual value

Demo mode ON

Demo mode OFF

Demo mode (Demo mode can be deactivated only via service menu, not by OFF/ON.)

Operation switches to the mode wanted, demo mode or normal mode, as soon as "SuperFrost" has

been actuated.

Page 17/21

Service Information No. 01/2008 IGN 2556/2566

Step Display Operation

Display following

operation

Testing option / Info

Service menu start

Press

"ON/OFF" and

"SuperFrost" simultaneously for 3 seconds

Service mode

-- test display LED, buttons, door contact --

1

"H" flashes with

SuperFrost LED

Press "Up" twice

2

"L" flashes with

SuperFrost LED

Press "SuperFrost"

"H" flashes with

SuperFrost LED

"L" flashes with

SuperFrost LED

"rd" flashes

Service menu active.

Stepwise manual defrosting.

Service mode selected

Service mode activated

3 "rd" flashes Door closed and open

All button LEDs and display segments shine

Door contact, LEDs, display

4

All button LEDs and display segments shine

Press all the buttons

After step 4, actuation of the last button, a beep sounds.

Service mode

-- Testing electric loads--

5 "L0" shines No operation

- "L0" shines

- 2 seconds beep

Buttons / button actuation is confirmed by beep

Power input

1)

6

7

8

"L0" shines

"L1" shines

"L4" shines

Press "Up"

Press "Up"

Press "Up"

"L0" shines

"L1" shines

"L4" shines

"L7" shines

All OFF

Compressor ON

low speed

--

--

Defrost heater ON 199 watts

Fan ON

low speed

1.4 watts

9 "L7" shines Press "Up" "L8" shines

Return to step 5 is brought about by pressing the up button again.

End Press "ON/OFF"

1)

Power input = power input of the appliance in the respective testing step!

Fan ON

high speed

1.6 watts

Page 18/21

Service Information No. 01/2008

7.4 Sensor test (temperature display) and door contact test "E"

Step Display Operation

Display following

operation

IGN 2556/2566

Testing option / Info

Service menu start

"E" flashes with

Superfrost LED

Press "ON/OFF" und

"SuperFrost" simultaneously for 3 seconds

"H" flashes with

SuperFrost LED

Service menu active.

Stepwise manual defrosting.

Sensor test and door contact test (sensor values without offset, appliance in control mode)

1

"H" flashes with

SuperFrost LED

Press "Up" three times

"E" flashes with

Superfrost LED

Sensor test mode selected

2 Press "SuperFrost"

"E3" flashes alternately with sensor temperature

Air sensor

3

4

5

"E3" flashes alternately with sensor temperature

"E4" flashes alternately with sensor temperature

"E7" flashes alternately with sensor temperature

Press "Up"

Press "Up"

Press "Up"

"E4" flashes alternately with sensor temperature

"E7" flashes alternately with sensor temperature

"E8" flashes alternately with

"1" or display is

OFF

Evaporator sensor

Ambient sensor

Door contact

(display OFF=door closed,

1=door open)

End Press ON/OFF twice

8.0 Error code, troubleshooting

8.1 Table of error codes

Error code Defective component Emergency mode

F3 Freezer compartment air sensor

Compressor switches OFF.

Info:

Compressor switches ON again only when the appliance has been switched OFF and on again.

F4

Freezer compartment evaporator sensor

Compressor continuous operation (highest speed)

Appliance continues to operate in normal mode, only without regard to the ambient temperature.

Info:

Is displayed only in the service mode of the service menu, in step 2 instead of "rd".

Page 19/21

Service Information No. 01/2008

8.2 Troubleshooting VCC compressor / inverter

IGN 2556/2566

8.2.1 Checking the inverter and the frequency signal

Connect appliance to a power meter.

Switch appliance ON.

Is the compressor running?

Yes

Press SuperFrost

Does the speed increase, higher power input?

Switch appliance OFF

Does the compressor stay at a standstill?

No

Yes

Inverter faulty

No

No

Yes

Is

the compressor running after 90 seconds?

Yes

Frequency signal faulty / not connected or power PCB faulty.

Inverter; power PCB and the frequency cable are OK.

No

Frequency signal faulty / not connected or power PCB faulty.

see 8.2.2

Attention: In case of interruption of the frequency signal, the compressor starts only after 90 seconds!!

Page 20/21

Service Information No. 01/2008

8.2.2 Checking the compressor

IGN 2556/2566

Fault profile: Compressor does not run (even after a waiting time of 90 seconds)

Select step 6 (compressor ON) in the service menu under "7.3 service mode". If the compressor now starts there was probably an operator error. Otherwise proceed as described below.

At the inverter, line voltage (230V) must be applied between N and 1/C.

Is voltage applied to the inverter?

Is

Yes

Is the compressor running?

No

Pull off frequency signal connector (lilac) from the inverter, wait 90 secs. the compressor running?

No

Replace inverter electronic module.

If the compressor still does not run, replace the compressor.

Then replace the inverter back again.

No

Yes

Yes

Fault at cable connection / connector or power PCB.

Presumably operator error.

Check speed increase!

Power PCB or inverter fault.

Page 21/21