The question about the number of compressor units in household appliances of the Korean brand LG often arises among buyers planning to purchase new equipment, or among owners faced with the need for repairs. Modern models LG is most often equipped with one compressor, but its design and the principle of operation are radically different from the technology of previous years. Understanding this difference is critical to assessing the energy efficiency and durability of the unit.
Traditionally, refrigerators were divided into one- and two-compressor systems, where each cooling circuit was served by a separate motor. In the case of LG, the situation is different: the company has introduced technology Linear Inverter Compressorthat allows one unit to cope with tasks that previously required two. This engineering solution has become the standard for most series, from budget to premium.
In this article we will examine in detail why one compressor in modern LG refrigerators is a sign of technological progress, not savings. You will learn about the principles of operation of a linear drive, understand the difference between inverter and conventional motors, and also get answers to questions about maintenance and diagnostics.
The evolution of LG refrigeration systems: from two to one
Historically, the presence of two compressors was considered a sign of quality and reliability. The logic was simple: one motor cools the refrigerator compartment, the second – the freezer. This allowed independent temperature control and reduced the load on each node. However, this scheme had significant drawbacks: high noise levels, high power consumption and many moving parts subject to wear.
LG engineers proposed an alternative that revolutionized the idea of refrigeration technology. Linear compressor works on the principle of reciprocating piston movements, excluding rotational elements. This reduced the number of friction points and increased cooling efficiency. Now one powerful and smart unit is able to maintain ideal conditions in both chambers.
The transition to single-circuit systems with one compressor does not mean simplifying the design at the expense of quality. On the contrary, digital control allows you to accurately dose the refrigerant and regulate the motor power depending on the load of the chambers and the ambient temperature. This ensures stability, which is difficult to achieve in systems with two independent motors.
Types of compressors used in technology LG
Today, several types of compressor units can be found in LG refrigerators. Understanding their differences will help you better understand the characteristics of the model and predict its behavior in operation. The main division occurs according to the type of drive and the method of power control.
The first and most common type is linear inverter compressor. It combines the advantages of linear piston motion and inverter speed control. Unlike old models that worked on the “on-off” principle, this unit smoothly changes power, rarely stopping completely.
The second type is the classic inverter compressors rotary type. They are also found in some series, especially mid-range models or older lines. Their operation is also characterized by smoothness, but structurally they differ from linear analogues by the presence of a crank mechanism.
- 🔹 Linear Inverter: minimal noise, high energy efficiency, service life up to 20 years.
- 🔹 Smart Inverter: classical inverter system with a good balance of price and quality.
- 🔹 Standard Compressor: found in the most budget or older models, it works jerkily (start-stop).
It is important to note that even if your model does not have a linear, but a regular inverter motor, it will still be much quieter and more economical than older analogues. However, it is linear technology that is the hallmark of the brand and is installed in the top series.
The operating principle of a linear inverter compressor
The heart of any LG refrigerator with The marking Linear Inverter is a unique engine. In traditional compressors, electrical energy is first converted into rotational motion of the rotor, which is then converted through a crank mechanism into linear motion of the piston. Each stage of this transformation is accompanied by energy losses, vibration and noise.
The LG linear compressor eliminates intermediate links. The electromagnetic field directly affects the piston, causing it to move back and forth. The absence of rotating elements and friction points (except for the piston itself on the cylinder walls) makes the design extremely reliable. Efficiency such a system is significantly higher, since energy is not spent on overcoming rotational inertia.
⚠️ Attention: Linear compressors are sensitive to voltage drops in electrical networks. To extend the service life of expensive equipment, it is strongly recommended to use a high-quality voltage stabilizer or surge protector.
The operation of such a motor is controlled through a complex electronic board. Sensors constantly monitor the temperature inside the chambers. If you need to quickly cool freshly loaded food, the compressor operates at higher speeds. When the set mode is reached, it switches to minimum power, only compensating for heat inflows. This ensures that there are no temperature changes.
Why does a linear compressor sometimes click?
A characteristic click at the beginning and end of the operating cycle is normal for LG linear compressors. The sound is produced by a relay that switches the operating modes of the electromagnet. This is not a sign of a malfunction if the clicks are not accompanied by a refusal of the refrigerator to cool.
Comparison table: One versus Two compressors
To finally dispel the myths about the need for two motors, consider the comparative characteristics of the systems. The data is based on the technical specifications of modern LG models and statistics from service centers.
| Parameter | One linear compressor (LG) | Two conventional compressors | One conventional compressor |
|---|---|---|---|
| Noise level | Minimum (up to 25 dB) | Medium/High | High |
| Energy consumption | Class A++ / A+++ | Class B / A | Class A / A+ |
| Temperature accuracy | High (±0.5°C) | Average | Low (large differences) |
| Service life | Up to 20 years | 7-10 years | 7-10 years |
As can be seen from the table, a modern single-motor system outperforms older dual-motor systems in all key indicators. The only argument in favor of two compressors is the ability to completely turn off one of the chambers (for example, the refrigerator), leaving only the freezer to work. However, in modern LGs this function is often implemented programmatically or through special “Vacation” modes. linear unit Outperforms old dual-engine designs in all key indicators. The only argument in favor of two compressors is the ability to completely turn off one of the chambers (for example, the refrigerator), leaving only the freezer to work. However, in modern LGs this function is often implemented in software or through special “Vacation” modes.
The cost of repairing a system with one compressor may be higher due to the price of the unit itself, but the probability of its failure is much lower. Two conventional motors statistically they break down more often simply because there are more of them and a resource each is limited by startup cycles.
Diagnostics of faults and noise
Despite high reliability, equipment can fail. Understanding how a working and faulty compressor behaves will help you notice the problem in time. Normal operation a linear compressor is characterized by a quiet, uniform hum, which can either fade or intensify.
Alarm signals are:
- 🔴 Loud metallic knocking: may indicate wear of the piston group or problems with the motor suspension.
- 🔴 Continuous operation without stopping: if the refrigerator is humming 24/7 and does not turn off, there may be a freon leak or a malfunction of the sensors.
- 🔴 No start: if you hear a click, but the motor does not start, the problem may be in the start relay or the compressor itself.
Often owners confuse the operation of the No Frost system with compressor noise. Fans and defrost sensors also make sounds. To locate the source, place your hand on the back wall of the refrigerator (where the motor is located). If the vibration comes from there and is accompanied by a characteristic hum, it is compressor.
☑️ Primary diagnosis of noise
Repair or replacement: what to choose?
If diagnostics confirmed the compressor malfunction, the owner is faced with the question of whether repairs are advisable. Replacing an LG linear compressor is an expensive procedure. The cost of the unit itself is high, and its installation requires a qualified technician with equipment for evacuation of the system and refilling with freon.
It is important to consider the age of the refrigerator. If the equipment is more than 10 years old, repairs can cost 50-70% of the price of a new device. In this case, it is more economical to purchase a new model. However, if the refrigerator is under warranty (and LG often gives a 10-year warranty specifically for the compressor, but not for the work to replace it), then repair is required.
⚠️ Attention: Do not try to replace the compressor yourself or open the refrigeration circuit. This requires special licenses, tools and knowledge. Unprofessional soldering of pipes will lead to rapid damage to the new compressor and moisture entering the system.
When contacting a service center, always request the use of original spare parts. Installation analogs can lead to incorrect operation of the electronics, since the parameters of LG linear compressors are unique and selected for a specific control board.
Frequently asked questions (FAQ)
Is it true that LG refrigerators have only one compressor?
Yes, the vast majority of modern LG models are equipped with one compressor. Thanks to Linear Inverter technology, one powerful unit is enough to effectively cool both the refrigerator and freezer compartments. Two-compressor circuits are practically not used in new LG equipment.
How many years does an LG linear compressor last?
The manufacturer claims a service life of up to 20 years. In practice, with a stable voltage in the network and proper care (timely defrosting, cleaning the condenser), these units operate for 10-15 years without serious problems. The compressor itself is often given an extended warranty of 10 years.
Why does the LG refrigerator click loudly when turned on?
A characteristic click is a feature of the operation of a linear compressor. This is the sound of the relay that supplies an impulse to the electromagnet to start the piston. If there is a single click followed by quiet operation, this is normal. If clicks occur in a series and the refrigerator does not start, diagnostics are required.
Is it possible to replace a conventional compressor with a linear one in an old refrigerator?
Theoretically it is possible, but technically it is extremely difficult and expensive. The control board will need to be replaced, since the operating algorithms of linear and conventional motors. Economically, such an upgrade does not make sense; it’s easier to buy a new refrigerator.
Does the number of compressors affect defrosting?
The number of compressors does not directly affect the type of defrosting (drip or No Frost). However, single-circuit systems with one compressor more often use the No Frost system, since one powerful motor is capable of pumping air through complex air ducts in both chambers.