A modern kitchen is unthinkable without a reliable equipment, and Belarusian refrigerators Atlant have long established themselves as a standard of durability and functionality. A special place in the model range is occupied by two-chamber units equipped with two compressors, which ensures independent operation of the refrigerating and freezing chambers. Understanding exactly how this system functions allows owners not only to competently approach the choice of model, but also to promptly notice the slightest deviations in the operation of the device.
The main difference between such models is the presence of two separate cooling circuits. If in classic single-compressor versions one motor drives the refrigerant throughout the entire volume, here one is responsible for each chamber independent circuit. This engineering solution radically changes the approach to cold distribution, allowing you to achieve more accurate temperature conditions and reduce the load on each individual node at peak values.
In this article we will analyze the design of the system in detail, consider the advantages of separate circuits and discuss the nuances of maintenance. You will learn why having a second motor extends the life of your equipment and how to correctly diagnose problems if they arise. A deep understanding of internal processes is the key to long and trouble-free operation of your household appliances.
Design features of a dual-circuit system
The heart of any refrigerator is a compressor, and in models Atlant with two motors, there are, respectively, two of them. Each of them is a sealed unit whose task is to compress the refrigerant and ensure its circulation in a closed circuit. One compressor is solely responsible for freezer compartment, and the second serves the refrigeration compartment. This scheme completely eliminates the flow of warm air from one zone to another when the door is opened.
The pipelines in such a system are also separated. The refrigerant moves through independent lines, which allows you to regulate the temperature in each chamber with high accuracy. If you need to quickly freeze a large amount of food, you can activate the super freeze mode, and this will not affect the temperature in the upper compartment where fresh food is stored. This is a key advantage of a two-circuit system.
In addition, the separation of circuits allows the use of different types of refrigerants or different pressure settings in each of them, although in household models Atlant most often one type of freon is used, but with different degrees of compression. Structurally, the system is protected from pressure imbalances, and each compressor has its own start-up protection equipmentwhich increases the overall reliability of the device.
It is important to note that the location of the compressors is usually standard - in the lower part of the rear wall. However, their operation is synchronized by an electronic or mechanical control unit, which distributes the load. If one circuit fails, the second can continue to work, maintaining at least partial functionality of the refrigerator until the technician arrives.
Advantages of independent operation of chambers
The main advantage of having two compressors is complete autonomy. You can defrost the refrigerator compartment by turning off the appropriate circuit while the freezer continues to operate normally. This is especially true for families who stock up on large amounts of food and cannot afford to lose the cold in the freezer, even for a short time. Independent control gives real flexibility.
The second important aspect is energy efficiency. Although two motors consume more power when running simultaneously, in reality they rarely work together at full power. As soon as one chamber reaches the set temperature, its compressor turns off, and the second continues to operate in quiet mode. This cyclical operation often turns out to be more profitable than the constant operation of one powerful compressor trying to cool two different volumes with different requirements.
It is also worth mentioning the cooling speed. After loading products or opening the door, a separate compressor will quickly restore the set temperature in its zone. This is critical for maintaining the freshness of perishable foods and preventing the growth of bacteria. Quick restoration of cold is a direct path to food safety.
⚠️ Attention: When defrosting one of the chambers manually, do not leave the door of the second compartment open for more than 10-15 minutes to avoid excessive load to the compressor upon subsequent start-up.
Operating algorithm and switching cycle
The cooling process in a two-compressor Atlanta is strictly regulated. Thermostats or electronic sensors in each chamber constantly monitor the temperature. As soon as it rises above the set threshold, the circuit is closed and the corresponding compressor starts. This process occurs independently for each circuit, which creates a unique on cycle.
Usually compressors operate in turns. It's rare to hear both motors humming at the same time, unless you've just turned on an empty refrigerator or loaded two compartments with warm food at once. In normal mode, you will hear a characteristic hum from one side or the other of the rear panel. This is normal working cyclicity.
☑️ Diagnostics of compressor operation
The duration of operation and rest of the compressor depends on many factors: the fullness of the chambers, the room temperature, the tightness of the seals. Electronics tries to minimize the number of starts, since starting an engine is the most energy-intensive process. Therefore rest intervals can be quite long if the refrigerator keeps the cold well.
If you notice that one of the compressors works almost non-stop, and the second is silent, this may indicate a problem. The tightness of the circuit may be broken or the thermostat may be faulty. In a normal situation, both units should have comparable operating cycles, albeit at different frequencies depending on the current load.
Comparison with single-compressor models
To understand the value of a two-compressor system, you need to compare it with a classic one. In models with one motor, cooling occurs sequentially: first the cold goes into the freezer, then, as necessary, into the refrigerator compartment through special dampers. This creates a dependence: if the freezer has not gotten cold, the main chamber will also be warm. Dependence of the circuits is the main disadvantage of such systems.
In two-compressor systems Atlantakh there is no such problem. You can set the freezer to -24°C and the refrigerator to +5°C, and both modes will be maintained perfectly. In single-compressor models, when installing a deep freeze, it may be too cold in the main compartment, and the food may freeze. Temperature accuracy here it is an order of magnitude higher.
Below is a table demonstrating the key differences between the two types systems:
| Parameter | One compressor | Two compressors |
|---|---|---|
| Independence of chambers | Absent | Full |
| Freezing speed | Average | High |
| Noise level | Higher (powerful motor) | Lower (low-power motors) |
| Maintainability | More complex (one circuit) | Simpler (localization) |
It is also worth noting the noise level. Two low-power compressors are often quieter than one large one, since the vibration is distributed and the power of each motor is less. However, if one of them fails, replacement may be more expensive due to the number of components, although they break down less often due to the gentle operating mode.
Fault diagnosis and characteristic sounds
A two-compressor system provides more information about its condition through sounds. If you hear that one motor is humming, and the second has been silent for several hours, although the chamber is warm, this is a cause for concern. A characteristic click of the relay and silence may mean faulty start relay or jamming of the piston group.
Another sign of trouble is the operation of both compressors simultaneously for a long time without rest breaks. This may indicate a freon leak in one of the circuits or that the refrigerator is overloaded with food. The system tries to compensate for the lack of cold by constant operation, which leads to overheating and accelerated wear.
What does a booming sound mean when the compressor is turned off?
Sometimes after stopping the engine you can hear gurgling or fluid flowing. This is normal: the refrigerant is redistributed in the pressure equalization system. If the sound is not accompanied by vibration of the case, there is no need to worry.
Pay attention to the temperature of the case. In the area where the compressors operate (usually on the left and right at the bottom of the back), the walls can heat up - this causes heat to escape from the condenser. But if only one side is heated, and the other is cold, although both circuits should work, perhaps one of them is not functioning. Local overheating is a sure symptom.
⚠️ Attention: If you smell burning or hear loud metal knocking about metal when starting, immediately unplug the refrigerator. Further operation may lead to fire or complete failure of the unit.
Operation rules to extend service life
In order for a two-compressor Atlant to serve for decades, it is important to follow simple rules. First of all, do not load hot food into the chambers. A sudden change in temperature forces the compressor to work harder to compensate for the heat. Allow the dishes to cool to room temperature before putting them in the refrigerator.
Regularly check the tightness of the door seals. If the rubber band comes off, warm air enters the chamber, and the sensors give a command for continuous operation. This applies to both departments. Wipe the seals with a soft cloth and check their elasticity. Tightness of the circuit is the basis for effective operation.
Do not forget about defrosting if your model is not equipped with a No Frost system. Even in dual-compressor models with a drip system ("crying wall"), ice can accumulate in the freezer. A thick ice crust acts as a heat insulator, causing the motor to work longer and consume more energy. Regular defrosting maintains efficiency.
It is also important to monitor the installation level of the refrigerator. If it is not level, the vibration from the two running motors can increase, causing rattling and loosening of the internal fasteners. Use a building level and adjustable legs for perfect installation.
Features of repair and maintenance
Repair of two-compressor models requires qualifications, since the master has to work with two independent systems. Diagnosis often begins with checking the voltage on each compressor. If there is current, but the motor does not start, the problem is in the unit itself or the starting relay. If there is no current, they look for a fault in control unit or the thermostat.
Replacing a compressor is a complex procedure that requires evacuation of the system and refilling the exact amount of freon. In dual-circuit models, it is important not to confuse the brand of refrigerant if the circuits are designed for different types (although this is rare). An error can lead to failure of the new compressor. Atlantakh this is rare). An error can lead to failure of the new compressor.
Preventive maintenance includes cleaning the condenser grille of dust and pet hair. A heat exchanger clogged with dust does not transfer heat well, the pressure in the system increases, and the compressor operates under overload. It is recommended to vacuum the back panel once every six months.
⚠️ Attention: Technical characteristics and connection diagrams may vary depending on the specific series and year of manufacture of the Atlant refrigerator. Always check the technical documentation for your device before starting any work.
Why does an Atlant refrigerator with two compressors run louder when turned on?
At the moment of startup, the piston group overcomes maximum resistance, which creates a characteristic hum. In dual-compressor models, this may seem more noticeable if it starts up frequently. However, modern engines Atlant equipped with effective shock absorbers, and after 1-2 minutes of operation the noise should drop to a minimum.
Is it possible to turn off one compressor forever and use only one chamber?
Technically this is possible, but not recommended by the manufacturer. Electronics may perceive a lack of load or a constant shutdown as an error and go into protection mode. In addition, the heat exchange between the chambers will be disrupted, which can lead to condensation or freezing of the partitions.
How often do you need to defrost a two-compressor refrigerator?
The frequency of defrosting depends on the model. If it is a No Frost system, then it only needs to be defrosted for hygienic washing (once a year). If the drip system is used, as ice forms in the freezer (usually every 3-6 months). The refrigerator compartment with a “crying wall” defrosts itself.