Kuppersbusch IKE 159-6 User manual

Refrigerator
IKE 159-6
IKE 189-6
IKE 229-6

Service Manual: H8-71-06
Responsible: Uwe Laarmann KÜPPERSBUSCH HAUSGERÄTE AG
E-mail: [e-mail]
Phone: [phone] Kundendienst
Fax: [phone] Postfach 100 132
Date: 19.02.2008 45801 Gelsenkirchen

Service Manual 3
For internal use only
Contents
1. Safety instructions .........................................................................................................4
2. Repair instructions.........................................................................................................5
3. Operation.........................................................................................................................6
3.1 Main switch............................................................................................................6
3.2 Temperature display..............................................................................................6
3.3 Temperature setting range....................................................................................6
3.4 Refrigerator section Super button .........................................................................6
4. Components....................................................................................................................7
4.1 Refrigerator fan (if present) ...................................................................................7
4.2 Heating the refrigerator section.............................................................................7
4.3 NTC sensor ...........................................................................................................7
4.4 Sensor readings ....................................................................................................8
5. Functions ........................................................................................................................9
5.1 Refrigeration system .............................................................................................9
5.2 Start-up program ...................................................................................................9
5.3 Defrosting the refrigerator section.......................................................................10
5.4 Freezer section Super program...........................................................................10
5.5 Customer service test program ...........................................................................10
6. Repairs ..........................................................................................................................11
6.1 Remove the regulator/light combination..............................................................11
7. Trouble shooting ..........................................................................................................12
7.1 Lack of refrigerant ...............................................................................................12
7.2 NTC fault .............................................................................................................12
8. Technical data...............................................................................................................12
9. Circuit diagrams ........................................................................................................... 12

4 Service Manual
For internal use only
1. Safety instructions
Danger!
Repairs may only be carried out by a qualified electrician!
Improper repairs can be extremely dangerous for the user.
It is essential that you observe the following instructions in order to prevent electric shocks:
• The casing and the frame may be live in the event of faults!
• Touching live components inside the appliance may cause dangerous currents to flow through your
body!
• Disconnect the appliance from the mains prior to carrying out any repair work!
• When inspecting live parts, a residual current circuit breaker must always be used!
• Always ensure that anearthed conductor is properly connected! The ground wire resistancemust not
exceed that specified in the standard! It is of vital importance for ensuring the safety of people and
the functioning of the appliance.
• On completion of repairs, an inspection must be carried out in accordance with VDE 0701 [Associa-
tion of German Electrical Engineers] or the corresponding regulations for your country!
• Do not touch any of the components in the appliance. The modules are also live!
• Observe instructions on electrostatic hazards!
• Wear safety goggles and protective gloves when handling refrigerants. Rinse your eyes with a lot of
water if refrigerant splashes into them.
Make sure you observe the following instructions:
• The appliances must be disconnected from the mains prior to all repairs. If inspections must be
carried out on live appliances, make sure you use a residual current operated device.
Attention!
Sharp edges: Use protective gloves.
Components may be electrostatic!
Observe handling precautions!

Service Manual 5
For internal use only
2. Repair instructions
• Never attempt to carry out repairs by “randomly replacing” components!
• Always proceed systematically and observe the technical documentation that goes with the appli-
ance!
• Electronic circuit boards are generally not repaired; instead they are completely replaced with original
spare parts. Exceptions are documented separately.
• Pipe connections in cooling circuits are not to be soldered. Lokring connections are to be used.
• Carry out a leak test and a functional test on the cooling circuit.
• The dehumidifier is to be replaced before evacuation and filling during any intervention in the cooling
circuit.
• It is essential to replace the compressor and the dehumidifier when repair work resulting from suction
leaks in the cooling circuit is carried out. Humidity which gets into the cooling circuit will cause irrep-
arable damage to the oil in the compressor.

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3. Operation
1. Main switch
2. Super LED button
3. Temperature display
4. Temperature adjuster
3.1 Main switch
The main switch is used to switch the refrigerator on and off.
3.2 Temperature display
The temperature in therefrigerator section is shown with the LED chain. Theselected target temperature
is always shown. The LED will begin to blink when the temperature setting is changed or when the sen-
sor temperature exceeds the temperature displayed by a 5.5heat transfer coefficient. During the defrost
phase and for 60min after defrosting the blink function will be suppressed.
3.3 Temperature setting range
The setting range is from 2°C to 8°C. The basic setting is 5°C.
3.4 Refrigerator section Super button
This button is used to start the Super program for the refrigerator section. Pressing this button again will
discontinue the program.
12 3 4

Service Manual 7
For internal use only
4. Components
4.1 Refrigerator fan (if present)
♦The fan will always be switched off when the door of the refrigerator section is open.
♦The fan is switched on when the refrigerator section is being defrosted.
♦When the room temperature is 27°C to 40°C the fan will clock (12min on / 20min off) if the com-
pressor is operating.
♦When the room temperature is > 40°C the fan will operate when the compressor is in operation.
♦If the compressor operates for longer than 100min the fan will clock (12min on / 20min off) until the
compressor switches off.
4.2 Heating the refrigerator section
The refrigerator section is heated by means of a reduced light bulb output. The refrigerator section is
only heated when the compressor dwells.
The heating for the refrigeration section is activated:
♦When the room temperature sensor is below 20°C. The light bulb will heat up more as the room
temperature drops.
♦When the refrigerator is defrosting.
♦When the “Super Freeze function” is in operation.
The heating for the refrigeration section is not activated:
♦For 120sec. after the door has been opened.
♦When the evaporator sensor measures more than 25°C.
4.3 NTC sensor
The refrigerator is equipped with three NTC sensors. The refrigerator section sensor is located in a sen-
sor box and can be replaced. The evaporator sensor is located in the insulating foam and cannot be re-
placed. The room temperature sensor is located on the electronic unit.

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4.4 Sensor readings
Temp.
in °C R kOhm Temp. in °C R kOhm Temp. in °C R kOhm Temp. in °C R kOhm
-40 169.1 -19 45.87 2 14.75 23 5.46
-39 158.19 -18 43.31 314.03 24 5.22
-38 148.06 -17 40.92 4 13.35 25 4.99
-37 138.66 -16 38.67 512.69 26 4.78
-36 129.93 -15 36.49 6 12.07 27 4.58
-35 121.75 -14 34.51 711.49 28 4.38
-34 114.12 -13 32.65 8 10.94 29 4.20
-33 107.03 -12 31.00 910.42 30 4.02
-32 100.43 -11 29.38 10 9.94 31 3.85
-31 94.28 -10 27.67 11 9.48 32 3.69
-30 88.73 -9 26.19 12 9.04 33 3.54
-29 83.42 -8 24.81 13 8.62 34 3.39
-28 78.47 -7 23.50 14 8.23 35 3.26
-27 73.84 -6 22.28 15 7.85 36 3.13
-26 69.52 -5 21.16 16 7.49 37 3.01
-25 65.31 -4 20.07 17 7.15 38 2.89
-24 61.52 -3 19.04 18 6.82 39 2.77
-23 57.98 -2 18.08 19 6.52 40 2.66
-22 54.67 -1 17.17 20 6.24
-21 51.57 016.32 21 5.97
-20 48.59 1 15.51 22 5.71

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5. Functions
5.1 Refrigeration system
The evaporators for the freezer section and the refrigerator section are supplied one after the other with
refrigerant. However, only the refrigerator section is regulated. Thismeans that the freezer section is de-
pendent on the operating time of the refrigerator section. The freezer section cannot be regulated.
1. Refrigerator section
2. Freezer section
3. Condenser
4. Compressor
5.2 Start-up program
The start-up program is activated when the sensor temperatures are all in the range of 10°C to 50°C
when the refrigerator is switched on.
Programme procedure
♦5s refrigerator section fan (if present)
♦5s refrigerator section heater
♦5s compressor
♦Standard operating mode

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5.3 Defrosting the refrigerator section
Commencement of a defrost phase:
♦After 12h of compressor operation.
♦After 10h of continuous compressor operation.
♦After 2h if the evaporator sensor shows below 8°C.
The refrigerator section is initially not supplied for with power for 20min.
Then the process will wait until the refrigerator section sensor has reached 8°C and the evaporator sen-
sor 6.5°C or until 3h have passed.
At room temperatures of > 30°C the switch-back temperature of the refrigerator section sensor will be
raised from 8°C to 10°C.
The refrigerator section heater is switched on for the duration of defrosting.
5.4 Freezer section Super program
The freeze program is activated with the Super button. The Super LED will light up for the duration of the
freeze program. The refrigerator is set at a target temperature of 0.9°C.
The refrigerator section heater is activated during the compressor dwell times in the Super program.
The appliance will switch back to the usual standard operating mode when the Super button is pressed
or when 6h have passed.
5.5 Customer service test program
♦Switch off the appliance.
♦Press the Super button and keep it pressed.
♦Switch on the appliance.
♦Keep the Super button pressed for 5sec.
♦Release the Super button.
♦The right-hand LED (refrigerator section setting of 8°C) will light up.
Pressing the temperature setting button will make the test program move forward. The test will be re-
commenced with the first test step after the final test step.
The Super button activates the test.
If no button is pressed for 5min and if the appliance is not switched off within 5 min, the refrigerator will
switch to standard operation.
LED flashes Function
8°C All the temperature sensors are checked. The LED will blink if all the temperature
sensors are OK.
6°C Refrigerator section fan is activated.
4°C The refrigerator section heater is activated.
2°C The compressor is activated.