Electrolux COMBI “Zero Degree” Service Manual

SERVICE MANUAL

REFRIGERATION

© ELECTROLUX HOME PRODUCTS S.p.A. Publication no.
Spares Operations Italy 599 36 55-29
Corso Lino Zanussi, 30 040716
I - 33080 PORCIA / PN (ITALY) ITZ/SERVICE/AA

Fax [phone]

COMBI

“Zero Degree”

REFRIGERATOR

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CONTENTS

1. INTRODUCTION ..................................................................................................................................................5

2. REFRIGERATING CIRCUIT ................................................................................................................................9

3. ELECTRICAL DIAGRAM.................................................................................................................................. 10

4. OPERATION ..................................................................................................................................................... 12

a. The Zero Degree compartment, only, requires cooling ................................................................................. 12

b. Both the refrigerator compartment and the Zero Degree compartment require cooling................................ 12

c. The refrigerator compartment, only, requires cooling .................................................................................... 12

d. Defrosting cycle on the battery-type evaporator............................................................................................ 13

e. SUPERFROST Function................................................................................................................................ 13

f. SUPERCOOL Function.................................................................................................................................. 13

g. Malfunctioning of cooler and 0 degree compartment temperature sensors .................................................. 14

h. Malfunctioning of temperature sensor of freezer compartment ..................................................................... 14

i. Characteristics of NTC sensor ........................................................................................................................ 15

j. Audible alarm .................................................................................................................................................. 16

5. ACCESSIBILITY TO 0 DEGREE COMPARTMENT ........................................................................................17

a. Battery evaporator and evaporator sensor .................................................................................................... 17

6. ACCESSIBILITY TO REFRIGERATOR COMPARTMENT.............................................................................. 18

a. Fan and refrigerator sensor ........................................................................................................................... 18

1. Evaporator shield ....................................................................................................................................... 18

2. Duct ............................................................................................................................................................ 19

3. Duct or filter duct (if featured)..................................................................................................................... 20

4. Fan protection housing............................................................................................................................... 20

5. Fan and cooler sensor................................................................................................................................ 21

7. ACCESSIBILITY TO FREEZER COMPARTMENT.......................................................................................... 22

8. ACCESSIBILITY TO CONTROL PANEL ......................................................................................................... 23

9. CONTROL PANEL............................................................................................................................................ 25

a. Power board................................................................................................................................................... 26

b. Display board ................................................................................................................................................. 28

10. VARIATION FOR MODELS WITH AIR FILTER............................................................................................. 29

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1. INTRODUCTION

This manual deals with the Zero Degree COMBI refrigerators produced in the Susegana factory (ZS).

It is a two-compressor combined appliance with PNCs: 925 703 xxx (KBI0280 DOD).

The cooler/zero degree and freezer compartments are independent; therefore it is possible to switch them on/off
according to the necessity.

The appliance is equipped with the following compartments:

 cooler and Zero Degree;
 freezer.

The evaporator circuit consists of:

 battery evaporator (Zero Degree and cooler compartment);
 evaporating tower (freezer compartment).

The appliance is controlled by the ERF2050 electronic system for the power and ERF2000 for the display.

KEY:

A = cooler compartment;
B = separator;
C = Zero Degree compartment;
D = freezer compartment.

A separator is placed between the refrigerator compartment and the Zero Degree compartment. This separator
is contoured at the front (near the door) to allow air to flow between the compartments.

Unlike No Frost refrigerators, the Zero Degree refrigerator is equipped with a battery-type evaporator that does
not have a heating element (for defrosting) or the relative thermal safety switches, since this evaporator is
defrosted by a fan which operates when the compressor is off.

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5 sensors detect the temperatures:

 cooler sensor (placed near the fan);
 zero degree sensor (placed on the cell in the Zero Degree compartment, right-hand upper drawer);
 battery evaporator sensor (placed on the battery);
 freezer sensor (placed on the cell in the freezer compartment, right-hand upper drawer);
 room sensor (placed on the circuit board for the display).

KEY:

A = cooler sensor;
B = Zero Degree sensor;
C = battery evaporator sensor;
D = freezer sensor.

The wires leading from sensors A, B, C and D are encapsulated in foam inside the cabinet. As a result, these
sensors are not replaceable.
The room sensor is part of the display board.

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The cold produced by the battery-type evaporator, which is located (behind evaporator shield) in the Zero
Degree compartment, is introduced first into the Zero Degree compartment and then into the refrigerator
compartment by a fan located behind fan housing.

Air is drawn in by this fan (located at the top of the cell), flows through the ducts, and descends to reach the
battery-type evaporator. The cold air leaves the bottom of the battery-type evaporator, strikes the two drawers in
the Zero Degree compartment, and is pushed up through the space between the separator and the door to
reach the refrigerator compartment.

A

IR FLOW

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NOTES:

1. Depending on the models, in place of the air filter there is a duct which contains a polyester isolating
panel;

2. The 0 degree compartment drawers feature sliders for the “humidity control“ function:

 slider closed to maintain humidity;
 slider open not to maintain humidity.

To ensure proper operation of the humidity control system, the covers must be installed on the drawers.

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2. REFRIGERATING CIRCUIT

The battery evaporator is positioned in the Zero Degree compartment and it is available as spare part.
The battery evaporator does not feature defrosting heaters or thermal cut-outs.

The tower-type evaporator of the freezer compartment is available as spare part.

Along the edges of the cabinet frame there is the anti-condensation coil.

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3. ELECTRICAL DIAGRAM

( Check the specific diagram for each model! )

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KEY:

2. compressor;

5. motor protector;

13. lamp;

24. fan;

28. running capacitor (on some models, only);

41. ERF2050 electronic board.

a. yellow-green;
b. brown;
c. blue;
d. white;
e. black;
f. grey;
g. red.

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4. OPERATION

The 0 DEGREE COMBI refrigerator, being a two-compressor operates with different modes depending if the 0
degree, refrigerator and freezer compartments requires cooling.

There is only one compressor for the cooler and 0 degree compartment; therefore there are 3 possible
combinations of normal operation:

a. The Zero Degree compartment, only, requires cooling

b. Both the refrigerator compartment and the Zero Degree compartment require cooling

c. The refrigerator compartment, only, requires cooling

Furthermore, the following condition may occur:

d. The battery-type evaporator requires defrosting

The following special condition may also occur:

e. The balancing heater is activated

a. The Zero Degree compartment, only, requires cooling

If only the Zero Degree compartment requires cooling:

 the compressor starts

 the fan operates at LOW speed (about 1500 RPM) continuously.

b. Both the refrigerator compartment and the Zero Degree compartment require cooling

If both the refrigerator compartment and the Zero Degree compartment require cooling:

 the compressor starts

 the fan operates at HIGH speed (about 1900 rpm) continuously.

c. The refrigerator compartment, only, requires cooling

If only the refrigerator compartment requires cooling:

 the compressor does not start

 the fan operates at HIGH speed (about 1900 rpm) continuously.

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d. Defrosting cycle on the battery-type evaporator

The ice that accumulates on the battery-type evaporator is regularly defrosted.

Defrosting takes place every time the compressor has operated for a sum total of 4 hours.

The defrosting cycle starts after the compressor shuts off.

During defrosting:

 the compressor does not operate
 the fan operates continuously at HIGH speed
 the refrigerator compartment cools down
 the battery-type evaporator warms up

The defrosting cycle terminates when the evaporator sensor detects a temperature of +4°C.

The fan stops if the door is opened.
To defeat the interlock switch on the door, place a magnet next to the reed element.

e. SUPERFROST Function

The SUPERFROOST function (rapid freezing) is switched on by activating the corresponding button:

 the pilot lamp relative to the SUPERFROST function is displayed;
 SP appears on the display;
 the compressor operates continuously for about 48 hours, then it switches off automatically.

To switch off the SUPERFROST function, before the expected end, press the relative button.

f. SUPERCOOL Function

The SUPERCOOL function (rapid cooling) is switched on by activating the corresponding button:

 the pilot lamp relative to the SUPERCOOL function is displayed;
 the compressor operates in thermostatic conditions and not continuously (as if the temperature knob

were in max position to reach +2°C) for about 6 hours, then it switches off automatically;

To switch off the SUPERCOOL function, before the expected end, press the relative button.

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g. Malfunctioning of cooler and 0 degree compartment temperature sensors

If during the normal operation a failure to NTC temperature sensor occurs (the signal coming from the sensor is
out of range), then:

 the appliance operates with a predefined cycle where the cooler compressor is switched on for 30

minutes and switched off for 40 minutes alternatively;

 the display of the cooler compartment displays one of the following symbols:

Cooler air temperature sensor faulty.

Battery evaporator temperature sensor faulty.

Zero Degree temperature sensor faulty.

When the sensor operates normally again, the above described conditions terminate.

h. Malfunctioning of temperature sensor of freezer compartment

If during the normal operation a failure of one NTC temperature sensor occurs (the signal coming from the
sensor is out of range), then:

 the appliance operates with a predefined cycle where the freezer compressor is switched on for 40

minutes and switched off for 40 minutes alternatively;

 the display of the freezer compartment shows one of the following symbols:

Freezer air temperature sensor faulty

When the sensor operates normally again, the above described conditions terminate.

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i. Characteristics of NTC sensor

Conversion table:

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j. Audible alarm

An audible alarm sounds when the door of the appliance remains open for more than 3 minutes.

The alarm shuts off when the door is closed.

If the door is opened back up, the audible alarm will sound again after 3 minutes.

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5. ACCESSIBILITY TO 0 DEGREE COMPARTMENT

a. Battery evaporator and evaporator sensor

To gain access to the battery evaporator and the temperature sensor, perform the following operations:

a) remove the upper cover of the 0 degree drawer;
b) remove the 0 degree drawer;
c) remove the separator;

d) remove the 2 fixing screws of the evaporator shield;

e) remove the evaporator shield pulling it back holding
down the upper part;

f) remove the polyester isolating panel A;

g) battery evaporator sensor;

B) battery evaporator.

A

B

C

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6. ACCESSIBILITY TO REFRIGERATOR COMPARTMENT

a. Fan and refrigerator sensor

To gain access to the fan and refrigerator sensor perform the following operations in order:

evaporator shield

↓

duct or filter duct (if featured)

↓

fan protection housing

↓

fan and refrigerator sensor

1. Evaporator shield

To gain access to the evaporator shield perform the following operations:

a) remove the upper cover from the 0 degree drawer;
b) remove the 0 degree drawer;
c) remove the separator;

d) remove the 2 fixing screws of the evaporator shield;

e) remove the evaporator shield pulling it back
holding down the upper part;

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f) ATTENTION: the evaporator shield must have the
holes as indicated in the picture;

2. Duct

a) remove the 2 fixing screws of the duct A;
pull down the duct to remove it;

b) under the duct there is a retainer for the tubes of the
filter;

A

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3. Duct or filter duct (if featured)

a) remove the 2 fixing screws of the duct (or filter duct
if featured);
pull down the duct to remove it;

b) remove the polyester isolating panel (it is not
featured in the appliances with the air filter);

4. Fan protection housing

a) remove the 2 fixing screws of the fan protection
housing and pull it down;

b)

E) fan connector;
F) cooler sensor.

B

C

D

E

F

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5. Fan and cooler sensor

a) remove the cooler sensor from the support and
remove the 3 fixing screws from the fan;

b) the fan cables must pass inside the slit (A) in the fan
support;

In case of replacement of the fan it is necessary to be sure that the fan operates with suction.
To simulate the door closed use a magnet and put it next to the reed element.

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7. ACCESSIBILITY TO FREEZER COMPARTMENT

a) remove the two freezer drawers;

b) remove the trims of the evaporating tower;

c) position of freezer sensor A;

A

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8. ACCESSIBILITY TO CONTROL PANEL

Warning: the electronic board is powered with a 220-240V 50Hz voltage also when the appliance
is OFF. Therefore, detach the supply plug from the appliance before operating on the electronic
board.

To access the control panel and its components (power board, display board, electronic board for the fan and
electrical connectors) perform the following operations:

a) remove the 2 screw covers and remove the 2 fixing
screws of the control panel;

b) pull back the control panel;

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A) buzzer;
B) display board;
C) sensor connector

 cooler sensor = white cable;
 battery evaporator sensor = black cable;
 freezer sensor = brown cable;

D) 0 degree sensor connector;
E) fan supply;
F) power board;
G) electric wiring connector

 electronic board supply;
 cooler compressor;
 lamp;
 freezer compressor.

A

B

C DE

F

G

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9. CONTROL PANEL

Cooler compartment key:

A. ON/OFF pilot lamp;
B. ON/OFF button of cooler compartment;
C. Temperature increasing button (+);
D. Cooler compartment temperature indicator;
E. Temperature decreasing button (-);
F. SUPERCOOL pilot lamp (rapid cooling);
G. SUPERCOOL function button (rapid cooling);

Freezer compartment key:

H. ON/OFF pilot lamp;
I. ON/OFF button of freezer compartment;
J. Temperature increasing button (+);
K. Freezer temperature indicator;
L. Temperature decreasing button (-);
M. SUPERFROST pilot lamp (rapid freezing);
N. SUPERFROST function button (rapid freezing);
O. Alarm pilot lamp;
P. Alarm deactivating button.

COOLER CONTROLS FREEZER CONTROLS

A B C D E F G H I J K L M N O P

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a. Power board

- view of power board (components side):

1. earth contact;

2. free;

3. line;

4. freezer compressor;

5. neutral;

6. neutral;

7. lamp;

8. neutral;

9. cooler compressor;

1. free;

2. free.

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1. cooler air sensor;

2. cooler air sensor;

3. battery evaporator sensor;

4. battery evaporator sensor;

5. freezer air sensor;

6. freezer air sensor;

1. free;

2. free;

3. free;

4. free;

1. 0 degree sensor;

2. 0 degree sensor.

1. free;

2. free;

3. fan (+);

4. fan (-);

5. free;

6. free;

7. free;

8. free.

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b. Display board

Key:

SW1 = reed element;
SW2 = ON/OFF button of freezer compartment;
SW3 = SUPERFROST function button (rapid freezing);
SW4 = temperature increasing button (+) of freezer compartment;
SW5 = temperature decreasing button (-) of freezer compartment;
SW6 = ON/OFF button of cooler compartment;
SW7 = SUPERCOOL function button (rapid freezing);
SW8 = temperature increasing button (+) of cooler compartment;
SW9 = temperature decreasing button (-) of cooler compartment;
SW10 = alarm deactivation button;
DGT1 = cooler compartment display;
DGT2 = freezer compartment display;
DL1 = SUPERCOOL pilot lamp (rapid cooling);
DL2 = SUPERFROST pilot lamp (rapid freezing);
DL3 = alarm pilot lamp;
DL4 = pilot lamp “+”;
DL5 = ON/OFF pilot lamp of cooler compartment;
DL6 = pilot lamp “-“;
DL7 = ON/OFF pilot lamp of freezer compartment;

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10. VARIATION FOR MODELS WITH AIR FILTER

Depending on the model in question, a filter duct may be installed in place of the central duct:

a) central duct;

b) filter duct;

c) open the door and replace the activated
charcoal filter at least once a year;

An activated charcoal filter is recommended for models equipped with an air filter.