Modern two-chamber refrigerators of the brand Atlant, equipped with two compressors, represent the pinnacle of engineering in the affordable segment household appliances. Unlike budget models with one motor, here each chamber - refrigerator and freezer - has its own independent cooling system. This fundamental difference determines not only energy efficiency, but also the durability of the device, as well as the quality of food preservation.
The principle of operation is based on the separation of refrigerant circulation circuits. When you open the door of the refrigerator compartment, warm air enters, sensors record the temperature change and send a signal to start the corresponding compressor. The freezer at this moment can remain in rest mode if the temperature in it is stable, which reduces the overall noise level and energy consumption.
Understanding exactly how this complex system functions will help owners avoid typical operating errors and diagnose malfunctions in a timely manner. The dual-engine design makes it possible to implement such advanced functions as complete No Frost or a combined cooling system, where a “crying” evaporator is used in the refrigeration chamber, and forced air circulation is used in the freezer.
Main components and their interaction in the system
The heart of any refrigeration unit is the compressor, and in models Atlant with two motors their role is critical. Each compressor is a sealed unit that compresses refrigerant and forces it to circulate through a system of pipes. In two-compressor models, one motor is solely responsible for the freezer compartment, providing deep freezing to -18°C and below, while the second maintains an optimal climate in the refrigerator compartment.
The most important element is evaporator, which directly absorbs heat from the internal volume of the chambers. In the refrigerator compartment, the evaporator is often hidden behind the rear wall or designed as a cooled panel (in models with Dry Frost). In the freezer, the evaporator works in tandem with a fan, evenly distributing cold air throughout the entire volume, which prevents the formation of an ice crust on food.
⚠️ Attention: An attempt to independently repair a sealed circuit or replace a compressor without special equipment and a license will lead to irreversible damage to the refrigerator and loss guarantees.
The connecting link between the compressor and the evaporator is capillary tube. This is a thin copper channel that creates the necessary resistance for the pressure drop. It is in this unit that a sharp expansion of the refrigerant and its cooling occurs. In dual-circuit systems Atlant each circuit has its own capillary tube, designed for a specific chamber volume and the type of refrigerant used (most often R600a or R134a).
Cycle circulation of refrigerant in two circuits
The cooling process in refrigerators Atlant with two compressors occurs in a closed cycle, which can be divided into several key stages. Understanding the physics of the process helps to understand why it is impossible to load hot products into the chamber or block the ventilation holes.
- 🌡️ Compression: The compressor sucks in gaseous refrigerant of low pressure and temperature, compresses it, turning it into a gas of high temperature and high pressure.
- 💨 Condensation: Hot gas passes through a condenser (grid on the back wall), where it gives off heat to the environment and turns into a liquid state.
- ❄️ Throttling: The liquid refrigerant passes through a capillary tube, where its pressure drops sharply, and it partially evaporates, becoming very cool.
- 🌀 Evaporation: In the evaporator, the refrigerant boils at a low temperature, actively taking heat from the products and air inside the chambers.
The uniqueness of the dual-circuit system lies in the complete isolation of these processes from each other. If in single-circuit models the cold from the freezer partially flows into the refrigerator compartment, here each circuit operates independently. This allows, for example, to defrost the refrigerator compartment while the freezer continues to operate normally.
Technical details of refrigerants
Modern Atlant models most often use isobutane (R600a). This is an environmentally friendly gas that requires less substance for refilling compared to freon, but is highly flammable, which requires special care during repairs.
Control system and electronics
The coordination of the operation of two independent circuits is monitored by an electronic control unit. This is the “brain” of the refrigerator, which reads the temperature sensors and makes decisions about turning the compressors on or off. Simpler models may use a mechanical thermostat, but modern series Atlant switch to digital control.
Thermal sensors (thermistors) are located at strategically important points: on the evaporator, inside the air flow and sometimes on the external panel. They transmit data about the current temperature. If the evaporator sensor “sees” that it is covered with frost and the temperature has dropped below a preset threshold, it gives the command to turn off the compressor or turn on the defrost heating element (in No Frost systems).
Inside the freezer (behind the panel)
| Component | Function | Location |
|---|---|---|
| Compressor No. 1 | Freezer compartment cooling | Bottom, rear |
| Compressor No. 2 | Cooling of the fridge compartment | Lower part, rear |
| Control unit | Sensor signal processing | Upper part or niche of compressors |
| Heating element defrosting | Removing ice from the evaporator |
Electronics also controls the operation of the fans. In models with the system No Frost the fan turns on only when the compressor is running and the chamber doors are closed. This prevents warm air from being blown out and saves the resource of the fan motor.
Advantages of a two-compressor design
Why do manufacturers, including Atlant, continue to produce models with two motors, despite the rise in cost of the design? The answer lies in a number of undeniable advantages that users have appreciated over the years of operation.
Firstly, it is independence of operation. You can turn off the refrigerator compartment during a long vacation, leaving only the freezer on, or vice versa - use the refrigerator as a wine cabinet, turning off the freezer (if the design allows such adjustment via electronics). Secondly, dual-compressor models cool faster. Two lower-power motors cope with the load more efficiently than one powerful one, operating in a more gentle mode.
The noise level in such refrigerators is usually lower. Since the compressors are turned on in turns or with pauses, the peak noise load on human hearing is minimal. In addition, the likelihood that both motors will fail at the same time is statistically negligible, which increases the overall reliability of the unit.
Features of defrosting and maintenance
Operation of a two-chamber refrigerator Atlant with two compressors requires compliance with certain rules, especially regarding defrosting. Even if the freezer has a No Frost system, a complete lack of care can lead to problems. In the refrigerator compartment, a system is often used Drop ("crying wall"), where moisture flows into a special groove and evaporates.
Despite automation, manufacturers recommend carrying out preventive defrosting at least once a year. This is necessary for cleaning hard-to-reach places, flushing drainage channels and disinfecting the internal space. The accumulation of bacteria and mold in the drainage can lead to the appearance of an unpleasant odor, which will circulate through the chambers along with the air.
- 🧼 Cleaning: Use mild, non-abrasive detergents to wash the interior shelves and walls.
- 🚿 Drainage: Clean the water drain hole with a soft brush or brush to prevent blockages.
- 🔌 Rest: After defrosting, let the refrigerator stand turned off for 15-20 minutes before restarting so that the oil in the compressors drains into the crankcase.
⚠️ Attention: Never use sharp objects (knives, screwdrivers) to chip ice. One careless movement can puncture the evaporator, and the refrigerant will instantly evaporate, making repairs economically unfeasible.
Typical faults and their symptoms
The two-compressor circuit, while reliable, can still encounter technical problems. Knowing the symptoms will help you understand whether you need to call a professional or if simple steps are enough. Most often, owners are faced with situations where one chamber works and the other does not.
If the freezer has stopped freezing and the refrigerator is working properly (or vice versa), this is a direct indication of a problem in one of the circuits. This could be a failure of a particular compressor, a freon leak in one of the circuits, or a malfunction of the thermostat/sensor of this chamber. There may also be a failure in the control module, which has stopped sending a signal to turn on one of the motors.
☑️ Diagnostics in the absence of cold
Continuous operation of the compressor without shutting off is another alarming symptom. In two-compressor models, this may mean that one of the circuits has lost its tightness, or the thermal insulation of the housing has been damaged. Also, the cause may be a clogged capillary pipeline, which requires professional cleaning or replacement of the filter-drier.
Why does an Atlant refrigerator with two compressors consume more energy?
In fact, modern dual-compressor models are often more economical than their single-circuit counterparts. Two low-power motors work more efficiently and turn on less often, since each serves a smaller volume. However, if one of the circuits is faulty (for example, it has lost freon), the compressor will work without stopping, which will lead to a sharp increase in electricity bills.
Is it possible to transport a two-chamber Atlant refrigerator lying down?
It is strictly not recommended to transport any refrigerators, especially with two compressors, in a horizontal position for more than 15-20 minutes. Compressor oil may leak into the refrigerant circuit, causing water hammer when first started. If transportation lying down is unavoidable, after installation, allow the equipment to stand upright for at least 4-6 hours before turning it on.
What does the blinking indicator on the control panel mean?
In models Atlant with electronic control, the blinking of the temperature indicator usually indicates an increase in the temperature in the chamber above the permissible limit. This may be due to prolonged defrosting, loading a large amount of warm food, or a technical fault. If the operating mode is not restored within several hours, diagnostics are required.