Liebherr IGN 2556, IGN 2566 User Manual

After Sales Service International

Service Documentation

Service Manual No. 01/2008 LHG/TKD-Ne/23.10.08

Appliance Documentation

IGN 2556 from Index 20
IGN 2566 from Index 20

with IceMaker

NoFrost freestanding freezer

IGN 2556

IGN 2566

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Service Information No. 01/2008 IGN 2556/2566

Contents

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 5

4.1.1 General 5

4.1.2 Freezer compartment 5

4.2 Refrigeration components and functions 8

4.2.1 Freezer compartment 8

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

5.1 General 9

5.1.1 Electronic control system 9

5.1.2 Door magnet 10

5.2 Freezer compartment 11

5.2.1 Evaporator module 11

5.2.2 Evaporator sensor 12

5.2.3 Air sensor 12

5.2.4 Fan 13

5.2.5 Temperature fuse 14

5.2.6 IGN 2566 only, IceMaker 15

5.2.7 IGN 2566 only, double solenoid valve IceMaker 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 17

7.3 Service mode 18

7.4 Sensor test (temperature display) and door contact test "E" 19

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

8.1 Table of error codes 19

8.2 Troubleshooting VCC compressor / inverter 20

8.2.1 Checking the inverter and the frequency signal 20

8.2.2 Checking the compressor 21

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Service Information No. 01/2008 IGN 2556/2566

1.0 Operating and control elements

1 Up Setting button temperature higher
2 Down Setting button temperature lower
3 Temperature/function display
4 ON/OFF ON/OFF button
5 SuperFrost SuperFrost function
6 Alarm Alarm OFF button for audible alarm

1

2

3

Freezer compartment

4

5

6

2.0 Functions at a glance

Control:

Temperature display:

Temperature range:

Temperature alarm:

Door alarm:
Fan:

Defrosting:

Interior light:

Service menu:

Compressor:

Solenoid valve
refrigeration circuit:

Electronic
Actual value

-14°C to -28°C
Visual, audible
Audible
Present

Automatic

Present
Present
VCC

Not present

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Service Information No. 01/2008 IGN 2556/2566

r

3.0 Description of appliance

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.

3.1 Sensor positions, schematic diagrams

Foamed-in rear wall

Fan

evaporato

Evaporator sensor

Air sensor

IGN 2566 only:

IceMaker

Fig. 3.1 / 2 Fig. 3.1 / 1

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Service Information No. 01/2008 IGN 2556/2566

4.0 Main components and their functions

4.1 Electrical components and functions

4.1.1 General

Electronic control system

Type:

Components:

Series 6 electronic control system
Electronic single-board solution

4.1.2 Freezer compartment

Electronic control system

Setting range:

Display range:

Functions

Temperature alarm:

-14°C to -28°C
0°C to -49°C

Values outside the range are indicated by a cross bar

Alarm value: 4K warmer than set value.
Warmest alarm value: -10 °C
Coldest alarm value: -20 °C
Delay: 20 minutes
Visual: Flashing alarm LED
Audible: 4 beeps (suppressed during start-up)

Defrosting:

During start-up: The temperature display flashes until the switch-off
value 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.

ON: - During start-up after 6 hours cumulative compressor
running time.

- 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: 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.

Door alarm:

When: If door is open, after 60 seconds.
Audible: 3 beeps.

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Service Information No. 01/2008 IGN 2556/2566

SuperFrost:

Sensor

Air sensor:

Evaporator sensor:

Switch

Door switch:

ON: 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.

OFF: The freezer compartment sets itself to the set value.
Note: If SuperFrost is actuated during a defrosting phase, the SuperFrost

function is not performed before the defrosting phase has run.

Position: Behind the front panel of the evaporator module.
Function: - Switches the compressor ON/OFF.

- Generates the display value.
Position: Slipped into the lamellar evaporator.

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

- Switches the fan ON/OFF.

Position: In front panel

Loads

Fan:

Type: Reed contact
Contact type: Make contact
Function: Activation via:

magnet on the door, magnet is replaceable.
Switching signal when:
door open: fan OFF

door alarm ON after 60 seconds

Position: In the evaporator module, at the back centre.
Function:

Evaporator

sensor

Switch-on

value

Switch-on

value

Switch-on

value

Switch-off

value

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.

Compressor Door Fan

OFF CLOSED

ON CLOSED
OFF/ON OPEN
OFF/ON

CLOSED/

OPEN

OFF

ON

OFF
OFF

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

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Service Information No. 01/2008 IGN 2556/2566

Defrost heater:

Compressor:

Position: Clipped into lamellar evaporator
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!
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 Speed in rpm Operation

56 Compressor OFF Compressor OFF
71 1600 Ideal case
87 1900 Control mode

100,

0 (signal interruption),

other values than the

defined frequencies

117 3600 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.

3000

Start-up, signal

interruption, signal fault

For troubleshooting, see section 8.2 Troubleshooting VCC compressor / inverter

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