Liebherr IGN 2556, IGN 2566 freezer Service Manual
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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
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