Two-compressor cooling system in refrigerators Atlant is a classic engineering solution that ensures high reliability and independent operation of the refrigeration and freezer chambers. Unlike cheaper single-circuit models, here each compartment is responsible for its own, separate compressor i evaporator. This means that the refrigerant circulates through two isolated circuits without mixing and without transferring odors between storage areas.
This scheme allows you to achieve deep freezing of products in the freezer without the risk of defrosting the contents refrigerator compartment when the door is opened for a long time. Understanding exactly how this mechanism functions will help the owner to more effectively use the capabilities of the equipment and quickly diagnose malfunctions if they occur.
The main engine of the system is a motor-compressor, which compresses the gaseous refrigerant, increasing its temperature and pressure. In two-compressor models Atlant these units operate autonomously, controlled by their own thermostats or electronic modules. It is this autonomy that is the key factor in the durability and energy efficiency of the device.
Basic refrigerant circulation circuit
The cooling process begins in the compressor, where freon is compressed and turns into a gas at a high temperature. Then it enters condenser, usually located on the back wall or in hidden panels of the case. Here the gas gives off heat to the environment and condenses into a liquid. Two-compressor models are characterized by the presence of two independent condenser circuits or one common with a branching, but most often in Atlantakh complete decoupling of the circuits is implemented.
Next, the liquid refrigerant passes through a filter drier, where moisture is removed from it and enters the evaporator through a capillary tube. At this moment, a sharp expansion of the gas and its boiling occurs, which is accompanied by active absorption of heat from the refrigerator chambers. Cold air is distributed throughout the volume, cooling the products.
⚠️ Attention: In two-compressor models, the pressure in the circuits may differ. Do not try to resolder pipes or change compressors yourself without professional equipment and evacuation of the system.
After passing through the evaporator, the refrigerant returns to the compressor and the cycle repeats. An important feature is that each circuit has its own operating cycle, depending on the load of the chambers and the frequency of opening the doors.
Differences between a dual-circuit system and a single-circuit system
The main advantage of a scheme with two motors is the complete independence of temperature conditions. In single-circuit models, the cold from the freezer is transferred to the refrigerator compartment, which makes it impossible to turn off the freezer without losing cold in the main chamber. In Atlanta with two compressors, you can completely defrost one part while the other continues to operate normally.
In addition, the dual-circuit system eliminates over-drying of food. Since the evaporators are separated, the humidity in the refrigerator compartment is maintained at an optimal level, preventing vegetables and fruits from weathering. The freezer, in turn, provides fast freezing thanks to a powerful separate compressor.
Let's look at the main differences in the table:
| Characteristics | One compressor | Two compressors (Atlant) |
|---|---|---|
| Independence of chambers | Absent | Full |
| Freezing speed | Average | High |
| Energy consumption | Lower (one motor) | Higher (two motors), but more efficient |
| Noise level | Constant hum | Intermittent, quieter standby modes |
It is worth noting that the presence of two motors theoretically doubles the number of potential failure points, however, practice shows that compressors Atlant have a long service life. Sharing the load often extends the service life of each individual unit, since they do not work at the limit of their capabilities, trying to cool the entire volume at once.
The role of thermostats and automation
The operation of each compressor is controlled independently. This process is controlled by thermostats (thermostats) or electronic sensors located inside the chambers. When the temperature rises above the set value, the sensor closes the circuit, starting the motor. When the required minimum is reached, the circuit opens and the compressor stops.
In mechanical models Atlant capillary thermostats are used. The sensitive tube of such a device responds to temperature changes by physically opening the contacts. More modern series use electronic control modules that allow you to set the exact temperature in 1-degree increments.
It is important to understand that desynchronization of compressors is a normal phenomenon. One can turn on while the other is resting, or they can work simultaneously if you've just loaded a lot of warm food into both chambers. The automation itself balances the load.
⚠️ Attention: If both compressors operate without interruption for a long time, this may indicate a freon leak, a thermostat malfunction or condenser contamination. Check the tightness of the door seals.
Temperature zones and operating modes
Thanks to the separation of circuits, it is easier to maintain a stable microclimate in refrigerators Atlant . The refrigerator compartment maintains a temperature of +2 to +6 °C, which is ideal for storing ready-made food and drinks. The freezer is capable of lowering the temperature to -18 °C and below, ensuring long-term storage of meat and fish.
Many models are equipped with a function Super Freeze (Super Freeze). When this mode is activated, the freezer compressor runs continuously for a certain time or until ultra-low temperatures are reached. This allows you to quickly freeze fresh food, preserving their structure and vitamins.
The distribution of cold also depends on the design of the evaporator. In models with a system No Frost (although in two-compressor Atlantakh it is less common, more often there is a drip system) the air circulates forcibly. In classic models, the cold falls down naturally, so it is always colder on the lower shelves.
Why is it colder at the bottom in a two-compressor refrigerator?
In models without a fan (static cooling), cold air is heavier than warm air, so it sinks to the bottom of the chamber. In dual-compressor systems, this is especially noticeable, since each compartment has its own cold source, usually located in the upper part or behind the rear wall.
The user can independently adjust the cooling power in each compartment. This is especially useful in the summer, when the ambient temperature in the kitchen is high and the refrigerator requires more energy to maintain the set parameters.
Energy efficiency and noise level
There is a myth that two compressors consume twice as much electricity. In practice this is not entirely true. Although the total power of the two motors is higher, they operate more efficiently. Each of them turns on less often and works for less time, since it cools only half the volume (relatively speaking). In addition, modern compressors Atlant belong to the energy consumption class A or A+.
As for noise, the dual-circuit system wins here. When one small compressor is running, it produces less vibration and noise than one powerful one operating at full capacity in a single-circuit system. In addition, pauses in the operation of the motors create periods of silence, which subjectively makes operation more comfortable.
- 🔇 Silence at night: At night, when the refrigerator is not opened, the compressors can turn on very rarely, ensuring silence in the kitchen.
- ⚡ Peak loads: When defrosting or loading food, both motors can work simultaneously, creating a short-term noise background.
- 📉 Wear of parts: Shorter continuous operation time reduces wear of the piston group and valves.
To assess real energy consumption, you should pay attention to the energy efficiency sticker located on body. It shows approximate kWh per year, calculated using standard tests.
Fault diagnosis and maintenance
Understanding the operating principle helps in the initial diagnosis. If the refrigerator has stopped freezing, but the light is on, first of all you need to listen. Is the refrigerator compressor working? What about the freezer? If one of them is silent, the problem may be in the thermostat or start relay of this particular circuit.
A frequent problem is the formation of a “snow coat” on the back wall. In two-compressor models, this indicates that the defrost cycle (if automatic) is not completed or the door seal is broken. The motor may try to compensate for the heat gain by working without stopping.
☑️ Diagnostics in the absence of cold
Regular maintenance includes defrosting (for models with a drip system) at least once a year, even if the manufacturer claims the ability to work without defrosting. Ice accumulation on the evaporator hidden behind the panel reduces heat transfer efficiency and causes the compressor to work longer.
⚠️ Attention: Specifications and location of elements may vary depending on the specific series and year of manufacture. Always check the product data sheet before starting any work.
Frequently asked questions (FAQ)
Is it true that a two-compressor refrigerator is more difficult to repair?
In terms of the number of components - yes, there are more of them. However, diagnosis is often easier since the fault is localized to one specific circuit. Replacing a compressor or thermostat is carried out according to a standard procedure similar to single-circuit models.
Is it possible to transport a two-compressor Atlant lying down?
It is strictly not recommended to transport a refrigerator lying down for more than 15-20 minutes, especially on its side. Oil from compressors can leak into the freon circulation circuit, which will lead to water hammer when first turned on. After any transportation, let the equipment stand upright for at least 4-6 hours.
Why is one compressor louder than another?
Compressors can have different powers and designs. The freezer motor is often more powerful and may be a little louder, especially in heavy freeze mode. If the noise is not accompanied by body vibration or knocking, this is normal.
How often do you need to defrost a two-compressor Atlant?
For models with manual defrosting or a drip system in the refrigerator compartment, it is recommended to carry out a complete defrost every 6-12 months. The freezer with the system No Frost does not need to be defrosted, but cleaning the condenser from dust is required regularly.