Electrolux SANTO 2941i, SANTO 2902i, SANTO 2932i Service Instruction
SERVICE INSTRUCTION
COLD
©AEG Hausgeräte GmbH Publ.-No.
Muggenhofer Straße 135 599 51 07 03
D-90429 Nürnberg
Germany EN
Fax +49 (0)911 323 1420
TSE-N
Edition: 02.01
LONGFRESH
MODELS
SANTO 2941i
SANTO 2902i
SANTO 2932i
AEG-Refrigeration 292 5209
68
VH34-AUK 06.94
Santo 2941i longfresh E-Nr.: 621 370 121 (R12)
Santo 2902i longfresh E-Nr.: 621 371 022 (R134A)
1. General
The Santo 2941i longfresh has electronically controlled information displays and microprocessor controlled regulators for the refrigerator as well as for the 4-star freezer compartment.
A so-called longfresh compartment is integrated within the refrigerator of the appliance. In
addition, refrigerator and longfresh compartment are controlled via a magnetic valve.
Refrigerator compartment
longfresh compartment
4-star freezing compartment
AEG-Refrigeration 292 5209
69
VH34-AUK 06.94
Santo 2941i longfresh E-Nr.: 621 370 121 (R12)
Santo 2902i longfresh E-Nr.: 621 371 022 (R134A)
2. Operation
2.1. Refrigerator and longfresh compartment
The refrigerator can be adjusted within a temperature range of +3 to +9
o
C (rated temperature). In contrast, the longfresh compartment has a fixed temperature setting of 2oC +2K. In
both longfresh shelves, air humidity can be set individually from about 40 to 90%.
Control lamp for Control lamp for Operation control lamp
refrigeration fan express cooling for refrigerator
Button Express Main switch Temp.contol LCD-temp.display
refrigeration cooling switch cooling/longfresh refrigerator refrigerator
fan compartment
2.1.1.Main switch
Switching on and off of the refrigerator and longfresh compartment is only possible with a pen
or similar (childproof safety switch).
Important: Do not disconnect from mains supply as logical on and off switching of
components is via electronic module.
2.1.2.Switch for refrigeration fan
When switching on, the appliance is automatically switched to operation with refrigeration fan
(control lamp on). The running fan increases cooling capacity and decreases thermal
stratification. Due to the energy-optimised 12V-DC motor, the refrigerator uses even less
energy when the fan is activated. If not required, the refrigeration fan can be switched off with
this button.
AEG-Refrigeration 292 5209
70
VH34-AUK 06.94
Santo 2941i longfresh E-Nr.: 621 370 121 (R12)
Santo 2902i longfresh E-Nr.: 621 371 022 (R134A)
2.1.3.Express cooling
By pressing the button Express cooling, the temperature within the refrigerator is decreased
to its lowest value (+3
o
C). The fan is in constant operation (6 hours). After 6 hours, operation
reverts to normal. Both methods represent an extremely high cooling capacity. The longfresh
fan is running in fixed cycle operation.
2.2. Freezing compartment
The temperature for the freezing compartment can be adjusted between -14 to -28
o
C.
2.2.1.Main switch
As with the refrigerator, switching on and off of the freezing compartment is only possible with
a pen or similar (childproof safety switch).
Important: Do not disconnect from mains supply as logical on and off switching of
components is via electronic module.
2.2.2.Fast freeze button
- Pressing the fast freeze button activates the fast freeze function.
- Automatic reverting to normal operation after 48h, temperature limitation to -35
o
C!
- Manual reverting to fast freeze is possible at all times by pressing the fast freeze button
again.
Control lamp Control lamp
freezer fast freeze
LCD temp. display Temp. control Main switch Fast freeze
freezer freezer freezer switch
AEG-Refrigeration 292 5209
71
VH34-AUK 06.94
Santo 2941i longfresh E-Nr.: 621 370 121 (R12)
Santo 2902i longfresh E-Nr.: 621 371 022 (R134A)
2.3. Temperature displays
The average refrigerator and the warmest freezer compartment temperatures are indicated
on the LCD display. During and after defrosting, the refrigeration temperature display is stored
and changes only when the temperature reaches normal levels again. 4 hours after the start
of defrosting, the actual temperature is displayed again.
Display range:
Refrigerator +19 to 0
o
C
Freezer 0 to -39
o
C
If the temperature falls outside these ranges, only lines are displayed; if the refrigeration
temperature falls below 0
o
C, then 0oC is constantly displayed.
As this is an integrated appliance, the background illumination of the temperature displays and
all LEDs are switched off when the refrigerator door is closed.
3. Warning controls
longfresh-temp.control lamp Freezer temperature control lamp
Cancel button acoustic signal refrigerator Cancel button acoustic signal freezer
3.1. Acoustic warning
The acoustic signal sounds if:
- one of the two doors is open longer than 30s (permanent signal). The signal can be
switched off by pressing the respective cancel button. The warning will sound again after
2 mins, if one door stays open.
- one or more sensor(s) is defective (short circuit). The intermittent signal can be switched
off by pressing the cancel button, an optical fault information is displayed on the
respective LCD window (see point 10).
- the temperature in relation to the set value rises excessively too much (values see point
3.2).
The intermittent acoustic temperature warning can be switched off by pressing the
respective cancel button and will sound again as soon as the door is next opened.
AEG-Refrigeration 292 5209
72
VH34-AUK 06.94
Santo 2941i longfresh E-Nr.: 621 370 121 (R12)
Santo 2902i longfresh E-Nr.: 621 371 022 (R134A)
3.2. Optical warnings
The red LED alarm (temperature control lamp for refrigerator and freezer) flashes if
- the temperature in the longfresh compartment rises above 6
o
C
- the freezer temperature is
- at setting 1: warmer than -10.5
o
C
- at setting 2: warmer than -14.5
o
C
- at setting >2.75: warmer than -17.5
o
C
All LEDs and temperature displays are switched off when the door is closed (LCD display
without background illumination).
4. Defrosting
The refrigerator and the longfresh compartment are defrosted automatically. The freezer has
to be defrosted manually as this part is cooled statically (conventional freezer). Points 4.1 and
4.2 therefore only relate to the refrigerator and the longfresh compartment.
4.1. Normal defrosting
The longfresh compartment and the refrigerator are defrosted automatically after 12 h
compressor operation (= circa once per day).
Operation of electronic:
1. step: Pre-defrost (preparation of defrosting):
- prior to actual defrosting, the refrigerator temperatures are cooled to rated
temperature less 2K
2. step: Start of defrosting:
- the longfresh compartment is defrosted with a 10W-defrost heater (longfresh
compensation heater).
- the refrigerator is defrosted by self-generated heat
3. step: End of defrosting in longfresh compartment:
- when the temperature at the longfresh evaporator sensor has reached
+8
o
C.
4. step: End of defrosting in refrigerator:
- when the temperature at the refrigerator evaporator sensor has reached
+6
o
C and defrosting of longfresh compartment has been completed.
AEG-Refrigeration 292 5209
73
VH34-AUK 06.94
Santo 2941i longfresh E-Nr.: 621 370 121 (R12)
Santo 2902i longfresh E-Nr.: 621 371 022 (R134A)
Defrosting of the refrigerator cannot be completed before defrosting of the longfresh
compartment is finished as the refrigerator is always defrosted at the same time the longfresh
compartment is defrosted.
4.2. Defrosting in continuous operation
Should the appliance for any reason switch to continuous operation (rise in ambient
temperature, faults in coolant system, overloading ...), then refrigerator and longfresh
compartment are defrosted after 10 h compressor operation, to avoid insufficient cooling due
to excessive ice build-up.
5. Refrigeration technology and automatic control technology - functional principles
5.1. Freezer
The Santo 2941io longfresh is equipped with a conventional 4-star freezing compartment.
This freezing compartment operates completely independent with respect to refrigeration and
control technology. The following description therefore relates mainly to the refrigerator and
longfresh compartment.
5.2. Refrigerator and longfresh compartment
The refrigerator incorporates a back panel evaporator, the longfresh compartment is
equipped with a U-evaporator (i.e. at the back and side).
5.2.1.Magnetic valve
By means of the magnetic valve, cooling can be directed optionally to the refrigerator and the
longfresh compartment or only to the longfresh compartment. Two types of valves are fitted
in series: the monostable Danfoss-3-way valve Type 0904 or the bistable Elbi-3-way valve.
If voltage is applied to the Danfoss-3-way valve, then the longfresh compartment only is
cooled. Switch-over of the Elbi-3-way valve is by voltage impulses.
AEG-Refrigeration 292 5209
74
VH34-AUK 06.94
Santo 2941i longfresh E-Nr.: 621 370 121 (R12)
Santo 2902i longfresh E-Nr.: 621 371 022 (R134A)
5.2.2.Refrigeration technology
condenser
refrigeration evaporator
magnetic valve
compressor ` longfresh evaporator
5.2.3.Compressor control
The compressor is activated via the refrigeration fan or via the longfresh cooling fan.
Depending on the air sensor condition, the electronic activates the following functions:
a) Both cooling fans are warmer than the cut-in value:
- compressor ON
- magnetic valve without voltage, i.e. refrigerator and longfresh compartment are
cooling
b) The refrigeration fan is warmer than the cut-in value, the longfresh air sensor is between
ON- and OFF value:
- compressor ON
- magnetic valve without voltage, i.e. refrigerator and longfresh compartment are
cooling
- longfresh fan cycles, i.e. cooling performance in longfresh compartment is
reduced.
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