Question about what how many compressors is installed in a particular refrigerator often becomes decisive when purchasing new equipment. Consumers are looking for a balance between energy efficiency, noise levels and food quality. Modern systems No Frost (without frost) can be implemented in both single-circuit and double-circuit schemes, and the number of motors plays a key role here.
Understanding the operating principle compressor helps not only to choose a reliable model, but also correctly diagnose problems in the future. If one motor is humming in your unit, and two are humming in the next one, this significantly affects the operating algorithm and maintainability. Let's figure out how these systems are designed and why manufacturers choose different engineering solutions.
It is important to immediately note that the number of engines does not always directly correlate with the quality of cooling, but determines the functionality freshness zones and the independence of temperature conditions. In this article, we will analyze the design features in detail so that you can make an informed choice.
One compressor: classic operating scheme
The traditional and most common scheme in the budget and mid-range segment is the use of one compressor. In such models, the refrigerant circulates through a single circuit, passing first through the evaporator of the freezer, and then, having partially given off the cold, enters the main refrigeration compartment.
To implement the system No Frost in single-circuit models, a fan is used that forcibly drives cold air from freezers to the refrigerator compartment. This avoids the formation of ice on food, but creates a temperature dependence. If you open the refrigerator door, warm air will enter the common circuit, and the compressor will have to work harder to cool both chambers again.
⚠️ Attention: In single-circuit systems, it is impossible to completely turn off the freezer while leaving the refrigerator compartment running, since the refrigerant passes through them sequentially.
Despite the appearance modern restrictions inverter motors allow to minimize the disadvantages of one compressor system. They work constantly, but with varying power, which reduces wear and noise. For most families, this option is optimal in terms of price and quality ratio.
Two compressors: complete independence cameras
More complex and expensive models are equipped with two compressors. In this scheme, each motor serves its own circuit: one is responsible exclusively for the freezer compartment, and the second for the refrigerator compartment. This engineering solution allows you to achieve complete temperature independence.
The main advantage of this design is the ability to regulate the temperature in each compartment separately without influencing each other. In addition, the system No Frost in two-compressor models often works more efficiently, since the air flows do not mix. Odors from the freezer will not penetrate into the main compartment, and defrosting one chamber will not require stopping the entire system.
However, the presence of a second motor increases energy consumption and vibration levels, although modern noise insulation technologies reduce this effect to a minimum. Repairing such systems is also more expensive, since if one of unitsfails, replacement or repair requires a highly qualified technician.
Comparison of systems: table of characteristics
To visually assess the difference between single-type and double-circuit systems, let's turn to a comparative analysis. The parameters presented below will help you understand what exactly you are paying for when choosing a more expensive model.
| Comparison parameter | One compressor | Two compressors |
|---|---|---|
| Temperature independence | Partial (dependent) | Complete independence |
| Energy consumption | Lower (one motor) | Higher (two motors) |
| Noise level | Quieter (fewer sources) | Higher (total noise) |
| Repair cost | Budget | More expensive |
| Preservation of products | Standard | Optimal (no mixing of smells) |
As can be seen from the table, the choice depends on priorities. If silence and saving electricity are critical for you, single-circuit system with a high-quality inverter will be the best choice. If you store large volumes of products and are sensitive to foreign odors, two circuits will justify the investment.
Full No Frost technology and the number of motors
Often buyers confuse the number of compressors with the type of defrosting. The marking Full No Frost means that ice does not form in both the refrigerator and freezer compartments. However, this does not guarantee the presence of two motors. The system can be implemented on one compressor using complex valve systems and dampers.
Models with one motor and Full No Frost use an electromagnetic valve that switches the refrigerant flows. First one circuit is cooled, then the other. This process occurs quickly and cyclically, so the user does not notice temperature changes. However, physically there is only one compressor.
⚠️ Attention: The presence of the Full No Frost inscription on the sticker does not automatically mean that you have two compressors. Accurate information can only be found in the technical data sheet or by the model of the unit.
Double-circuit Full No Frost systems are less common and usually in the premium segment. They provide more stable humidity in the refrigerator compartment, since the air is not overdried by the constant passage through the freezer evaporator.
The myth of two compressors
There is an opinion that two compressors always preserve vitamins better. In fact, the key factor is the stability of temperature and humidity, which modern single-circuit systems with inverters maintain just as well.
How to determine the number of compressors without opening
You don’t have to be a refrigeration engineer to understand how many motors are running in your device. There are several easy ways to find out without disassembling the back wall. The first and most reliable is studying the technical documentation.
Look at the sticker with technical characteristics, which is usually located inside the refrigerator compartment or on the back wall. The power consumption or current may be indicated there. If the values are total and quite high, this may indicate two motors, but it would be more accurate to look for the compressor model.
- 🔊 Listen to the operation: start the refrigerator in empty mode. If you hear two hums that are different in tone or turn on sequentially, most likely there are two motors.
- 🌡️ Check your independence: try setting the maximum temperature in the freezer and the minimum temperature in the refrigerator. If after a few hours the modes are established and do not affect each other, this is a sign of two circuits.
- 📄 Study the passport: in the "Technical Specifications" section the number of compressors is often directly indicated (Compressors: 1 or 2).
You can also find the exact model of the refrigerator on the Internet and look at a review or diagram on the manufacturer's website. This will eliminate any guesswork and give an accurate answer regarding designs your unit.
☑️ Diagnostics of the cooling system
The influence of compressor type on service life
The number of motors is not the only reliability factor. The type of drive plays a huge role. Inverter compressorswhich are found in both single- and double-circuit systems, last much longer than conventional ones.
Conventional linear compressors operate on the “on-off” principle, which creates peak loads on the mechanism at each start. Inverters smoothly regulate power, maintaining the set temperature without complete stops. This reduces the wear of rubbing parts.
In two-compressor refrigerators, the load is distributed between two devices, which theoretically can extend their life, since each operates in a more gentle mode. However, doubling the number of complex mechanical components statistically increases the likelihood of failure of any element of the system as a whole.
⚠️ Attention: The service life of the compressor also depends on the quality of the voltage in the network. For expensive two-compressor models, it is recommended to use a voltage stabilizer.
When choosing, it is worth considering that repairing the inverter control board is often more expensive than replacing a conventional starting relay, but the frequency of such breakdowns is much lower.
Frequently asked questions (FAQ)
Is it true that a refrigerator with two compressors consumes twice as much electricity?
Not necessarily twice. Although there are physically two engines, they operate independently and often for less time, since the volume of each chamber is cooled by its own circuit. Modern two-compressor models can have an energy consumption class of A+ or A++, comparable to their single-circuit counterparts.
Is it possible to defrost the freezer in a refrigerator with one compressor without turning off the refrigerator?
In most single-circuit models, no. Since the refrigerant passes through both evaporators, it is impossible to turn off one circuit. You will have to defrost the entire unit completely. The exception is rare models with special shut-off valves, but this is rather an exception.
Do two compressors make a lot of noise compared to one?
Subjectively, the difference can be noticeable, especially when starting the second motor. However, modern models are equipped with effective noise insulation of the case. If the refrigerator is in the kitchen, the work of two quiet inverters may be even less noticeable than the work of one old loud motor.
What is better to choose for a large family?
For a large family, where the refrigerator is often opened and loaded with food, a model with two compressors or an advanced single-circuit system with a freshness zone is preferable. This will ensure better food preservation and no mixing of odors.