doc technique cn(es)...6

8/20/2019 Doc Technique CN(Es)...6

http://slidepdf.com/reader/full/doc-technique-cnes6 1/19

Service Information

Service Information no. 30/2004 LHG/TKD-KH/22.09.04

/19 30200400SI

After Sales Service International

Appliance documentation

CN(es) ...6

from Index 20

NoFrost combined refrigerator-freezer



Service Information no. 30/2004 CN(es) ...6

/19

1.0. Contents

2.0. Extract from Operating Instructions Page 3

3.0. The functions at a glance Page 6

4.0. Description of the appliance (in brief) Page 6

4.1. Schematic diagram: Refrigeration assembly Page 7

4.2. Schematic diagram: Freezer compartment Page 7

5.0. Refrigerator compartment – controls and functional parts Page 8

6.0. Freezer compartment – controls and functional parts Page 8

7.0. Cooling circuit Page 9

7.1. Refrigerator cooling circuit Page 9 7.2. Freezer cooling circuit Page 10

8.0. Special features Page 10

8.1. Electrical actuation of solenoid valve Page 10

8.2. Switch rules Page 10

8.2.1. Compressor switch rules Page 10

8.2.2. Freezer fan switch rules Page 11

8.2.3. Solenoid valves switch rules Page 11

9.0. Installation instructions Page 12

9.1. Defrost drain valve Page 12

9.2. Solenoid valve Page 12

9.3. Access to evaporator and fan modules Page 13

9.4. Evaporator module Page 14

9.5. Fan Page 14

9.6. Reed switch Page 14

10.0. Technical data – refrigerator compartment Page 15

11.0. Technical data – freezer compartment Page 16

12.0. Service menu Page 17

12.1. Defrosting the freezer compartment Page 17

12.2. Demo mode Page 17

12.3. CS mode Page 18

12.4. Sensor test Page 18

13.0. Customer menu Page 19

13.1. Child-proof lock Page 19

13.2. Display brightness Page 19

14.0. Error code table Page 19




/19

2.0. Extract from Operating Instructions




/19




/19

3.0. The functions at a glance (X = included, O = not included)

Control: X

O

ElectronicThermostat

Temperature display: OX

AnalogueDigital

Temperature alarm: X

X

Visual (freezer compartment only) Acoustic (freezer compartment only)

Door alarm: OX

Visual Acoustic (refrigerator and freezer compartments)

Fan: X

X

Refrigerator compartmentFreezer compartment

Defrosting: OX

Manual Automatic (refrigerator and freezer compartments)

Light: X

O

Refrigerator compartmentFreezer compartment

SuperCooling: X Automatic (+2°C for 6 hours)

SuperFrost: X Automatic (quantity-controlled, 30 to 65 hours)

Self-diagnosis routine: X

O

Start by means of button combinationStart by means of test plug

Refrigeration technology: X

X

1 joint compressorSolenoid valve

4.0. Description of the appliance (in brief)

The CN ...6 is a combined refrigerator-freezer with a NoFrost freezer compartment. It has onecompressor. The refrigerator and freezer evaporators are activated via a bistable solenoid valve. The twoevaporators are switched in series (see sketch 4.1.).The refrigerator compartment can therefore only be operated in combination with the freezercompartment. However, it is possible to operate the freezer compartment on its own.

Refrigerator compartment:The refrigerator compartment is equipped with a foamed-in evaporator, an air sensor and an evaporator

sensor. Both sensors can be replaced separately.

The air sensor detects the temperature for the temperature display and switches off the refrigerationfunction.

The evaporator sensor registers the temperature for defrosting the refrigerator evaporator and switchesthe refrigeration function on.

Freezer compartment:The freezer compartment is equipped with a NoFrost rear wall evaporator module, a fan module, an airsensor and an evaporator sensor. Both sensors can be replaced separately.

The air sensor detects the temperature for the temperature display and switches the refrigeration function

on and off.

The evaporator sensor activates the freezer fan and the evaporator module defrost function.

There is a special defrost drain valve for draining off the defrost water.




/19

4.1. Schematic diagram: Refrigeration assembly

4.2. Schematic diagram: Freezer compartment

Condenser

Solenoid valve

Com ressor

RC evaporator

FC evaporator

FC reed switch

Freezer fan

FC evaporator

Com ressor




/19

5.0. Refrigerator compartment – controls and functional parts

Electronics: 6-series Magnetek electronics, operating panel board and power board.The microcontroller is on the power board.

Display range: 2°C to 50°C

Setting range (referencesetting):

+2°C to +11°C

Door alarm: Sounds when refrigerator door has been left open for 60 seconds

Interior light: Inside right of refrigerator compartment

Refrigerator evaporatorsensor:

Switches the compressor on and sets the solenoid valve to position A(refrigerator and freezer compartments are activated).

Refrigerator air sensor: • Sets the solenoid valve to position B (only the freezer compartment is

activated).• Switches the compressor off according to the values read at the freezer air

sensor (logical AND operation).

• Detects the temperature to be displayed on the refrigerator display

SuperCooling: Cools appliance down to +2°C for 6 hours

Defrosting: Takes place automatically when the compressor is idle

Refrigerator fan: At the top in the middle of the refrigerator rear wall. Can be switched on and offusing the button on the operating panel.

• The fan runs when the compressor is running and the solenoid valve is set

to position A (refrigerator and freezer compartments are activated).

• Switches off when door open (reed switch).

6.0. Freezer compartment – controls and functional parts

Electronics: 6-series Magnetek electronics, operating panel board and power board.The microcontroller is on the power board.

Display range: 0°C to -40°C

Setting range (referencesetting):

-16°C to -26°C

Temperature alarm: Alarm temperature is set at -8°C, regardless of reference setting. Thealarm is triggered if temperatures of -8°C or warmer have been displayedfor 20 minutes.

The alarm function is suppressed for 90 minutes after the defrost heaterhas been switched on.

When the appliance is switched on for the first time, the visual warning lightcomes on and the audible warning signal is switched off.

Door alarm: Sounds when freezer door has been left open for 60 seconds

Reed switch: Switches fan off when door is opened




/19

Fan: The fan runs when the following conditions are met:- Compressor on- Freezer door closed- Evaporator sensor activation temperature reached.

Evaporator sensor activation temperature:

a} On starting up: -25°Cb} In normal operation: 2K below freezer air sensor

Freezer air sensor: Switches the compressor on according to the values read at therefrigerator evaporator sensor.Switches the compressor off according to the values read at therefrigerator air sensor.Detects the temperature to be displayed on the freezer display.

Freezer evaporatorsensor:

Ends the defrost phase and switches the freezer fan on.

Evaporator heater: - Heats both the evaporator and the defrost drain gulley

- Safety temperature limiter switched in series with the heater

- Activated via the electronic control system

Defrosting: The defrost phase is activated:

- When starting up after 6 hours of accumulated compressor running time. - After an accumulated compressor running time of 12 to a maximum of60 hours, according to how often and how long the door is opened.

When the defrost phase is started, the compressor and the fan areswitched off and the defrost heater is switched on.

The defrost heater remains on until:- The evaporator has reached +10°C or- 50 minutes have elapsed.

The compressor is switched on after a delay of 10 minutes at the end ofthe heating phase.When activating the SuperFrost function during the defrost phase, thedefrost phase will not be interrupted.

Defrost drain valve: Foamed-in defrost drain valve; can be dismantled for cleaning.Important: valve must be replaced in exactly the right way (see section 9.1., “Installation instructions”).

SuperFrost: Cools the freezer compartment down to -32°C (quantity-controlled, 30 to 65hours)

7.0. Cooling circuit

7.1. Refrigerator cooling circuit

Evaporator: Foamed-in evaporator. Evaporator sensor can be replaced separately.

Injection point / flow sequence: Solenoid valve set to position A (cooling + freezing):Refrigerant is injected at the top left of the refrigerator evaporator andthen supplied to the freezer evaporator

Compressor: 1 joint standard compressor for refrigerator and freezer compartments

Solenoid valve: 2 capillary tubes (long winding for refrigerator, short winding forfreezer)




/19

7.2. Freezer cooling circuit

Evaporator: Ribbed evaporator fitted on the rear wall of the interior container in thefreezer compartment. The defrost heater is fitted directly on theevaporator.

Injection point: Solenoid valve set to position B (freezing):Top left of ribbed evaporator

Solenoid valve set to position A (cooling + freezing):Refrigerant is injected at the top left of the refrigerator evaporator andthen supplied to the freezer evaporator

Solenoid valve: 2 capillary tubes (long winding for refrigerator, short winding forfreezer)

Compressor: 1 joint standard compressor for refrigerator and freezer compartments

Frame heater: Foamed-in liquid heater for freezer door only

8.0. Special features

8.1. Electrical actuation of solenoid valve

The CN(es) ...6 appliances are equipped with bistable solenoid valves which maintain their switchingstate after actuation. They are therefore actuated with a short pulse. Switching state A or B also dependson the polarity of the actuation voltage (see sketch).

Negative half-wave switches solenoid valve to B Positive half-wave switches solenoid valve to A

Result:It is not possible to check actuation with a voltmeter as the actuation pulses are so small. To checkactuation of the solenoid valve, we recommend running the self-diagnosis routine. This makes theswitching process of the solenoid valve clearly audible.

8.2. Switch rules

8.2.1 Compressor switch rules

Freezer air sensor activation temperatureCompressor ON: or

Refrigerator evaporator sensor activation temperature

NB: The reactivation delay of the electronic control system (8 minutes) must have elapsed.

Freezer air sensor deactivation temperatureCompressor OFF: and

Refrigerator air sensor deactivation temperature

NB: As soon as the deactivation temperature is reached, a run-on time of 120 seconds is started.




/19

8.2.2 Freezer fan switch rules

When the compressor is runningFan ON: and

the door is closed

NB: When starting up, the fan is switched on after a certain period of time.

When the compressor is offFan OFF: or

Special case: The refrigerator air sensor is too warm and thefreezer air sensor is at least 2K below its deactivation temperature.So there is more cooling capacity available for the refrigerator.

NB: The freezer reed switch switches the freezer fan off if the door is opened.

8.2.3 Solenoid valves switch rules

- When the refrigerator air sensor deactivation temperature is reached, the solenoid valve is switched toB.

The freezer compartment is activated.

- When the refrigerator evaporator sensor activation temperature is reached, the solenoid valve isswitched to A.

The refrigerator and freezer compartments are activated.

B A

B A




/19

9.0. Installation instructions

9.1. Defrost drain valve

The defrost drain valve can be accessed through thecompressor recess.

It is situated directly above the evaporation tray of thecompressor.

To dismantle the valve, we recommend unscrewingand carefully removing the compressor.

9.2. Solenoid valve

Seal

Important: the rounded sideof the seal must face

upwards when installing!

Permanent magnets

Im ortant: Install correctl

The magnets must repeleach other.

1 = Freezer2 = Drier3 = Refrigerator




/19

9.3. Access to evaporator and fan modules

Remove drawers and glass shelves from the freezercompartment,Detach the air sensor, undo the Torx screws marked withthe arrows in the illustration and remove the rear wall.

You can pull out the evaporator module towards you bylifting it slightly.

Remove the plastic screws at arrows 1 and 2. Then

undo the Torx screws at arrows 3 and 4 and tilt outthe fan module.

3

2

4

1




/19

9.4. Evaporator module

The overheat guard illustrated at arrow 1 can be replaced separatelywith a retrofit kit. The retrofit kit consists

of 2 crimped connectors and 2 heat-shrinkable sleeves.

Important:Always attach the crimped connectors to the red and blue wiresof the overheat guard. The defrost heater will be destroyed if you cut through the white wire.

9.5. Fan

The fan is inserted in the plastic module with rubber buffers.The power cable has a removable connector.

9.6. Reed switch

The reed switch is inserted in the fan module.

1




/19

10.0. Technical data – refrigerator compartment

Light: 25 W

230 VFan: 6 W

230 V, 640 Ohm

Sensor values: Refrigerator evaporator sensor

Temperature [°C] Resistance [kOhm]

+30 3.8

+25 4.7

+20 5.9

+5 11.90 15.3

-10 25.9

-18 40.4

-25 60.8

-30 82.3




/19

11.0. Technical data – freezer compartment

Fan: 4 W

230 V

625 Ohm

Solenoid valve: Aweco (bistable)

230 V (actuated by half-waves)

2.8 kOhm at +20°C

Sensor values: Freezer air sensor

Temperature [°C] Resistance [kOhm]

+20 5.9

+5 11.9

0 15.3

-10 25.9

-18 40.4

-25 60.8

-30 82.3

Defrost heater: CN 3366 and CN(es) 3866:

- 125 W

- 230 V

-404 Ohm at +20°C

- 0.55 A

CN 3666:

-165 W

- 230 V

-309 Ohm at +20°C

-0.72 A

Overheat guard: - +93°C, switched in series with defrost heater

- Cannot be reactivated; has to be replaced after tripping




/19

12.0. Service menu

The Service menu may only be used by a customer service engineer.

12.1. Defrosting the freezer compartment “H” (evaporator must be cold)

• Press freezer On/Off button and SuperFrost button simultaneously for 3 seconds.

• “H” will flash in freezer display, the SuperCooling and SuperFrost buttons will flash.

• Press the SuperFrost button. The appliance is now in Defrost mode.

• The defrost phase is activated. This is indicated by a flashing “A”.

• The defrost phase ends as soon as the evaporator has reached +10°C or after 50 minutes.

• The appliance will switch back automatically to normal operating mode.

• The defrost phase can be ended sooner by pressing the On/Off button (for 1 second).

12.2. Demo mode “d1” or “d0”

• Press freezer On/Off button and SuperFrost button simultaneously for 3 seconds.• “H” will flash in freezer display, the SuperCooling and SuperFrost buttons will flash.

• Press “Up”, “d1” or “d0” will flash.

• d1 = Demo mode is switched off. To switch on Demo mode, press the SuperFrost button.

• d0 = Demo mode is switched on. To switch off Demo mode, press the SuperFrost button.

• If you do not want to make any changes, press the On/Off button, not the SuperFrost button.

• When Demo mode is switched on, the compressors and fans are not activated.

• NB: Demo mode cannot be switched off by switching the mains power off and on.This is only possible by using the Service menu.




/19

12.3. CS mode “L”



• Press “Up” twice until “L” flashes.

• Press the SuperFrost button. You are now in CS mode.

• “rd” will flash.

• “ru” is displayed if the ambient temperature sensor is faulty.

• Open and close both doors.

• All segments / LEDs will light up.

• Press all buttons. Every time you press a button it is acknowledged with a beep.

• The audible warning signal will sound for 2 seconds.

• The display will read “L0”.

• All consumers can be activated individually using “Up” and “Down”.

L1: Compressor on, solenoid valve set to position B.L2: Compressor on, solenoid valve set to position A.

L3: Freezer fan.

L4: Freezer defrost heater.

L5: Refrigerator light on.

L7: Refrigerator fan on.

• Stop by pressing On/Off.

12.4. Sensor test “E” (temperature display) and door contact test



• Press “Up” three times until “E” flashes.

• Press the SuperFrost button.

• The appliance is in Sensor test mode and is running in control mode.

• Display: “E1” alternates with refrigerator air sensor temperature.

• All sensor values and door contacts can be queried using “Up” and “Down”.

E1: Refrigerator air sensor

E2: Refrigerator evaporator sensor

E3: Freezer air sensorE4: Freezer evaporator sensor

E8: Freezer door contact (0 = door closed, 1 = door open).

E9: Refrigerator door contact (0 = door closed, 1 = door open).

• Stop by pressing On/Off twice.




13.0. Customer menu

In the Customer menu, the customer can activate the child-proof lock and adjust the brightness of thetemperature display.

13.1. Child-proof lock

• Press the SuperFrost button for 3 seconds, SuperFrost must flash.

• “c” will flash in freezer display, the SuperCooling and SuperFrost buttons will flash.


• The display will read “c” and a flashing “0” (child-proof lock deactivated) or “1” (child-proof lockactivated).

• The required function (c0 or c1) can be selected using “Up” and “Down”.

• Confirm with the SuperFrost button.

•

When the child-proof lock is activated, the “Child-proof lock” symbol lights up on the display.• Press the On/Off button to switch back to normal operating mode.

13.2. Display brightness

• Press the SuperFrost button for 3 seconds, SuperFrost must flash.

• “c” will flash in freezer display, the SuperCooling and SuperFrost buttons will flash.

• Press “Up”, “h” will flash.


• The display will read “h” and a number between 1 and 5 will flash (5 = max. brightness).

• Adjust to required brightness using “Up” and “Down”.

• Confirm with the SuperFrost button and press the On/Off button to switch back to normal operatingmode.

14.0. Error code table

Error code Defective component Emergency operation

F1 Refrigerator air sensor Compressor on for 10 minutes and off for 40minutes.

F2 Refrigerator evaporator sensor Compressor on for 10 minutes and off for 40minutes.

F3 NoFrost freezer air sensor Freezer compressor runs continuously

F4 NoFrost freezer evaporator sensor Freezer compressor runs continuously

FA, FC, Fd, FP Reserved for factory testing. -

F6, F7, F8, F9,SE

Reserved for factory testing. -

doc technique cn(es)...6

Documents