Electrolux Eurocombi User manual

SERVICE MANUAL
REFRIGERATION
© ELECTROLUX ZANUSSI Publication number
ELETTRODOMESTICI S.p.A. 599 34 04-61
VIA GIARDINI CATTANEO, 3 2001-01-15
I - 33170 PORDENONE (ITALY) EN/SERVICE/AA
Fax [phone]
EUROCOMBI
This publication updates and replaces the previous.

Eurocombi 2/32

Eurocombi 3/32
CONTENTS
1. Introduction
1.1 Presentation page 5/33
1.2 Eurocombi: total nofrost page 7/33
2 Characteristics
2.1 Dimensions and volumes page 8/33
2.2 Characteristics page 8/33
2.3 Circuit diagram page 10/33
3 Components
3.1. Main components page 11/33
3.2. Electronic module page 13/33
3.2.1. CTB – Control board page 14/33
3.2.2. PWB – Power board page 14/33
3.2.3. Connection box page 14/33
3.3. Fans page 15/33
3.3.1. Operation with doors closed page 15/33
3.3.2. Door aperture with compressor on page 16/33
3.3.3. Door aperture with compressor off page 16/33
3.4. Heating elements page 17/33
3.5. NTC sensors page 17/33
3.6. Overheating protection page 17/33
3.7. Evaporator page 18/33
3.8. Condenser page 18/33
3.9. Flap-operated mechanical thermostat page 18/33
4. Operation
4.1. Normal operation page 19/33
4.2. Defrosting page 19/33
5. Control panel
5.1. Switching the appliance on and off page 20/33
5.2. “Door open” alarm page 21/33
5.3. “Temperature” alarm page 21/33
5.4. Rapid freezing page 21/33
5.5. NTC sensors failure page 22/33
6. Service mode
6.1. Activation page 23/33
6.2. Signalling of faults page 23/33
6.3. Separate activation of loads page 24/33
6.4. Checking the door switches page 24/33
6.5. Disactivation page 24/33
6.6 Days counter page 24/33
7. Demo mode
7.1. Selecting Demo mode page 25/33
7.2. Main functions page 25/33
7.3. Exiting Demo mode page 25/33
8. Accessibility
8.1. Flap-operated thermostat page 26/33
8.2. Control board (CTB) page 28/33
8.3. Freezer compartment page 29/33
8.4. Glass shelves page 32/33
8.5. Air inlets page 32/33
8.6. Power board (PWB) page 33/33

Eurocombi 4/32

Eurocombi 5/32
1. INTRODUCTION
1.1. Presentation
The EUROCOMBI is a new free-standing combined refrigerator (with a refrigerator compartment in the upper
section and the freezer in the lower section) produced in the Fuenmayor factory in Spain.
This appliance features a single compressor and a total no-frost system. The operating cycles are controlled
electronically. The temperature inside the refrigerator compartment is controlled by a flap-operated
mechanical thermostat.
The Eurocombi range consists of eight models, with ALFA or DELTA stylings. All models are arched doors.
The differences between the various models consist in the size of the refrigerator and freezer compartments
and therefore in the number of shelves and drawers.

Eurocombi 6/32
Markets: UK, Spain, France, Germany, Italy, Sweden, Norway, Finland, Est Europe.
Brands: Zanussi, Electrolux, AEG, AME, Frigidaire, Corbero’.

Eurocombi 7/32
1.2. Eurocombi: total no-frost
The Eurocombi is a total no-frost appliance, and as such its operation is based exclusively on the battery
evaporator in the freezer compartment, which cools the air; the air is circulated by the fan.
A duct embedded in foam channels the cold air into the refrigerator compartment, where the flap-operated
mechanical thermostat regulates the flow of cold air and thus the temperature inside the refrigerator
compartment. The air returns to the freezer compartment through two outlets located at each side of the
vegetable drawer.
Operation of the compressor (switching on and off) is governed by an NTC sensor located externally (in air)
in the freezer compartment. The electronic system periodically defrosts the ice which accumulates on the
evaporator battery; defrosting terminates when a second NTC sensor, positioned in contact with the
evaporator battery, detects a temperature of +15°C.
The main characteristic of the control system used in the Eurocombi is the fact that the defrost operating
cycles are not of fixed duration, but calculated on the basis of the time required for defrosting (see section 4,
page 16).

Eurocombi 8/32
2. CHARACTERISTICS
2.1. Dimensions and volumes
The models in the Eurocombi range are numbered from 1 to 9 (with the exception of number 7, which has
been eliminated).
Model no. 1 2 3 4 5 6 8 9
height* mm 1950 1800 1800 1800 1650 1650 1750 1950
width mm 595 595 595 595 595 595 595 595
depth mm 664 664 664 664 664 664 664 664
gross vol. freezer liters 94 126 94 157 94 126 94 126
gross vol. fridge liters 267 193 230 156 193 155 217 230
total gross vol liters 361 319 324 313 287 281 311 336
*with top panel: +60mm
2.2. Technical characteristics
Performance:
Refrigerator from 1°C to 10 °C
Freezer 4 stars
Energy class C
Cilmate class SN, N, T,ST
Coolant R600a
Compressor: HPT12 high efficiency (N, SN class)
Power supply V/Hz 220-240/ 50
Rated power HP 1/5
Power absorption W 135
Current (normal / starting) A 0.6/8
Output power kcal/h 141
Resistance (normal / starting) ohm 17.8/27
Compressor: HPT14 high efficiency (T, ST class)
Power supply V/Hz 220-240/ 50
Rated power HP 1/5
Power absorption W 143
Current (normal / starting) A 1.1/6.4
Output power kcal/h 162
Resistance (normal / starting) ohm 11.6/19
Evaporator fan:
Voltage (DC) V 21 (class N) , 24 (class T)
Power W 3
Condenser fan:
Voltage (DC) V 21 (class N) , 24 (class T)
Power W 2.5

Eurocombi 9/32
Defrosting heater:
Power at 230V W 250
Drainage duct heater:
Power at 230V W 43.5
Safety overheating switches:
aperture °C 55
closure °C 45
Settings for refrigerator compartment:
Position of
thermostat knob
Cut-in Cut-out
stand by* Flap closed Flap closed
3 +10 °C +7°C
5 +7°C +4°C
7 +4°C +1°C
* in this position, the thermostat completely blocks the passage of cold air coming from the freezer
compartment.
Settings for freezer compartment:
Position of
thermostat knob
Cut-in Cut-out Alarm
0 -15 °C -16°C -12°C
3 -18 °C -19°C -12°C
5 -21°C -22°C -12°C
7 -23°C -24°C -12°C
Normal operating times:
pre-determined** hrs 6
minimum hrs 4
maximum hrs 25
** A six-hour operating cycle is performed each time the appliance is switched on.
Defrosting:
standard time minutes 22
maximum time minutes 30
temp. for end of defrosting °C +15

Eurocombi 10/32
2.3. Circuit diagram
1 power supply; 2 compressor; 5 fan; 9 defrosting heater; 11 drainage duct heater; 13 refrigerator light; 16
freezer switch; 26 safety switch (+55°C); 28 condenser; 41 electronic circuit board; 56 air sensor for
refrigerator (optional); 57 external (in air) NTC sensor; 59 NTC sensor for evaporator.

Eurocombi 11/32
3. COMPONENTS
3.1. Main components
1. Control board (CTB)
2. Flap-operated thermostat
3. Evaporator battery
4. Evaporator fan
5. Defrosting heater
6. Drainage duct heater
7. External (in air) NTC sensor
8. Heat cut-outs (+55°C), NTC sensor for evaporator
9. Power board (PWB)
10. Condenser fan
11. Condenser
12. Compressor

Eurocombi 12/32

Eurocombi 13/32
3.2. Electronic module
The control system on the Eurocombi features four inputs and six outputs:
inputs:
•NTC sensor on evaporator;
•External (in air) NTC sensor;
•Refrigerator door switch (reed element with foam-embedded magnet in door)
•Freezer door switch
outputs:
•Compressor
•Condenser fan
•Evaporator fan
•Defrosting heater
•Drainage duct heater
•Refrigerator compartment light

Eurocombi 14/32
3.2.1. Control board - CTB
The control board is located inside the
refrigerator compartment, and contains
the microprocessor which controls the
operation of the appliance, the buzzer
and the reed-element.
3.2.2. Power board - PWB
The power board is located in the compressor compartment, and
contains the triac for the following outputs:
-compressor
-compressor fan
-evaporator fan
-defrosting heater
-drainage duct heater
The power board is also fitted with a 24V DC transformer for the
fans.
In addition, a safety NTC fitted to the power board interrupts
operation of the compressor if the temperature exceeds 75°C; the
NTC switches the compressor on again when the temperature falls
to below 65°C, thus keeping the fans in operation.
3.2.3. Connection box
The connection box is located inside the freezer compartment. The
NTC sensors, heaters, evaporator fan and freezer door switch are
connected to the connection box.

Eurocombi 15/32
3.3. Fans
The two fans operate in parallel, but have different functions. The evaporator fan circulates cold air through
the appliance; the second fan is used to cool the condenser.
Both fans are powered at 21V DC or 24V DC, depending on the climate class (N or T).
evaporator fan condenser fan
The fans are actioned (switched on and off) according to the operation of the compressor and the aperture or
closure of the doors.
3.3.1. Operation with doors closed
When the compressor switches on, the fans, too, are switched on. After the compressor switches off, the
fans continue to operate for two minutes, then switch off. As the refrigerator compartment is cooled only by
the cold air ducted in by the evaporator fan, the fans switch on again after 30 minutes even if the compressor
remains off.
compressor
fans

Eurocombi 16/32
3.3.2. Door aperture with compressor switched on
If one of the doors is opened while the compressor is in operation, the fans are switched off.
If the door is not re-closed after two minutes, the fans are switched on again.
compressor
fans
doors
3.3.3. Aperture of door with compressor switched off
If one of the doors is opened while the compressor is not in operation, during the period of 30 minutes in
which the fans are switched off, the fans will switch on again for two minutes from the moment the door is
closed.
Thereafter, the fans switch off automatically.
compressor
fans
doors

Eurocombi 17/32
3.4. Heaters
The two heating elements are connected in parallel:
-the defrosting heater (250W) melts the ice which builds up on the evaporator battery.
-the drainage duct heater (43.5W) prevent the formation of ice in the drainage duct.
defrosting heater drainage duct heater
3.5. NTC sensors
This appliance is fitted with two NTC sensors, both located in the freezer compartment:
-the external (in air) NTC sensor governs the operating cycles of the compressor (switching on and off).
-the evaporator NTC sensor terminates the defrosting cycle by switching off the heating elements when
the temperature reaches 15°C.
°C Ohm
10 5348±0.6
5 6818±0.4
0 8758±0.4
-5 11337±0.4
-10 14795±0.6
-15 19475±0.7
-20 25862±0.8
-25 34666±0.9
-30 46921±1
-35 64161±1
-40 88577±1
3.6. Overheating protection
In case of a malfunction, two heat cut-outs fitted to the evaporator battery switch the heating elements off at
a temperature of +55°C.

Eurocombi 18/32
3.7. Evaporator
The evaporator fitted to the appliance is located in the
freezer compartment and consists of a traditional
NOFROST battery with multiple fins.
3.8. Condenser
The ventilated condenser is located in the base of
the appliance.
3.9. Flap-operated mechanical thermostat
The flap-operated mechanical thermostat controls the flow of air
into the refrigerator compartment. When the temperature detected
by the external (in air) bulb reaches the cut-in temperature, the flap
opens, thus allowing cold air to enter from the freezer
compartment.
When the temperature in the refrigerator compartment reaches the
cut-out value, the flap re-closes and prevents further air from being
ducted into the refrigerator compartment.

Eurocombi 19/32
4. Operation
4.1. Normal operation
The external (in air) NTC sensor in the freezer compartment controls the compressor’s operating cycles
according to the cut-in and cut-out temperatures for the selected operating mode (warm, normal or cold). As
explained previously, the fans switch off two minutes after the compressor has stopped; they remain
switched off for 30 minutes, and are then switched on again.
The refrigerator compartment is controlled independently by the flap-operated thermostat, which opens to
allow cold air to flow in from the freezer compartment.
4.2. Defrosting
The first operating cycle after the appliance is switched on has a fixed duration of 6 hours. After this cycle,
the defrosting cycle starts*: the compressor and the fans are switched off and the heating elements switch
on. When the NTC sensor on the evaporator detects a temperature of +15°C, the heating elements are
switched off and the defrosting cycle is complete.
In any case, the maximum duration of the defrosting cycle is 30 minutes, after which the appliance returns to
normal operation, even if the +15°C temperature has not been reached.
If due to a malfunction the temperature of the evaporator battery should rise to an excessive level, two heat
cut-outs connected in series intervene at +55°C to open the circuit of the heating elements (i.e. switch them
off).
The standard time for the defrosting cycle is 22 minutes. If the time required for the cycle is longer, this
means that a large quantity of ice has accumulated on the evaporator, and the subsequent operating cycle
will have a duration of less than 6 hours. If the time required for the cycle is shorter than 20 minutes, this
means that only a small quantity of ice has accumulated on the evaporator, and the subsequent operating
cycle will have a duration of more than 6 hours. In either case, the duration of the operating cycle is subject
to a lower limit of 4 hours and an upper limit of 25 hours.
In this way, the appliance adapts the duration of the normal operating cycle to the duration of the previous
defrosting cycle: this is the concept of adaptivity which distinguishes the Eurocombi range of fridge-freezers.
compressor
fans
heaters
N1,N2= normal operating cycle (if N1 is the first: N1=6 hours)
D1,D2= defrosting cycle
A=drain delay = 5 minutes
The compressor does not switch on immediately at the end of the defrosting cycle. Instead, there is a 5-
minute “drain delay” designed to prevent the formation of ice in the drainage duct.
The fans switch on two minutes after the compressor so that warm air is not circulated inside the appliance.
* The electronic control system does not interrupt the operating cycle of the compressor.

Eurocombi 20/32
5. Control panel
a= freezer regulation knob
b= “door open” alarm button/pilot lamp
c= “temperature” alarm button/pilot lamp
d= “rapid freezing” button
e= ON/OFF button/pilot lamp
f= regulation knob for flap-operated thermostat
5.1. Switching the appliance on and off
To switch the appliance on or off, press and hold down the ON/OFF button (e) for at least 2 seconds.
In order to ensure that the circuit does not remain pressurized, the electronic system introduces a 5-minute
delay in compressor start-up each time the appliance is switched on.
If it is desired to override this delay, press the alarm buttons (band c) simultaneously within 15 seconds after
switching on the appliance.