Modern household climate requires equipment not only to preserve products, but also to achieve maximum energy efficiency and silence. The model Biryusa 151, being a representative of the line with the system No Frost, demonstrates a complex engineering approach to cooling. Understanding exactly how this unit functions allows the owner not only to operate the device competently, but also to promptly diagnose any malfunctions that occur.
Unlike the old Soviet models, where static cold reigned and constant defrosting was required, dynamic circulation of air masses is involved here. The compressor, located in the lower rear part of the housing, runs the refrigerant in a closed circuit, creating a pressure difference necessary for the phase transitions of the substance. It is this process that underlies heat removal from the internal chamber to the external environment.
Particular attention should be paid to the forced ventilation system, which evenly distributes cold throughout the entire volume of the freezing and refrigerating chambers. The absence of ice on the walls is achieved due to the fact that moisture does not have time to condense on the surfaces, being carried away by air currents to a special evaporator. In this article, we will analyze each component in detail so that you can imagine the internal processes hidden behind the decorative panels.
Basics of the thermodynamic cycle in model 151
The foundation of the operation of any refrigeration equipment, including Biryusa 151is the compression cycle. The heart of the system is compressor, which compresses the gaseous refrigerant (freon), increasing its temperature and pressure. In this compressed state, the substance is sent to a condenser, usually located on the back wall or built into the side panels of the case.
Passing through the coils of the condenser, the hot gas gives off heat to the surrounding air and gradually turns into a liquid state. This process is called condensation. The movement of the refrigerant is strictly regulated, and any violations in the tightness of the circuit lead to a complete stop of cooling. It is important to understand that the system is under high pressure even when turned off.
⚠️ Attention: Opening the freon circuit on your own or attempting to solder tubes without special equipment and a license is strictly prohibited, as this can lead to ignition of the refrigerant or explosion.
Next, the liquid refrigerant passes through capillary tube or electronic expansion valve, where its pressure drops sharply. As a result of this difference, the liquid instantly boils at low temperatures. This stage occurs inside evaporatorhidden behind the back wall of the freezer, where heat is directly absorbed from the internal volume of the refrigerator.
Specifics of the No Frost system in Biryusa 151
The main distinguishing feature model Biryusa 151 is technology No Frost (or “Windy cold”). In traditional refrigerators, the evaporator is located directly in the freezer, becoming overgrown with frost. In this model, the evaporator is hidden in the technical compartment, and the cold is pumped into the chambers using an electric fan. This ensures that there is no ice crust on the products and internal walls.
Air circulation is organized through special channels located on the rear panel. The cold stream goes down, cooling the food, and then returns to the evaporator for re-cooling. This arrangement allows you to maintain the same temperature on all shelves, which is critical for long-term storage of perishable goods. The system automatically adjusts the intensity of the fan depending on the readings of the temperature sensors.
However, since the air is constantly circulating, it dries out. Moisture from the food is blown out and settles on the cold evaporator in the form of frost. To prevent this frost from blocking the air channels, an automatic defrosting system has been implemented. Periodically, based on a signal from a timer or real-time clock, it turns on Biryuse 151 An automatic defrosting system has been implemented. Periodically, based on a signal from a timer or real-time clock, it turns on Defrost heating element, which melts the accumulated ice.
Algorithm for automatic defrosting of the evaporator
The process of removing ice in the model Biryusa 151 is fully automated and does not require user intervention. This process is controlled by an electronic control unit that monitors the operating time of the compressor or uses a real timer. Typically, the defrost cycle starts every 8–12 hours of compressor operation when the unit is at rest.
When the defrost mode starts, the compressor and fan stop. At the same time, the heating element (heating element) located under the evaporator or built into it is turned on. The ice melts and the resulting water flows down a chute into a special tray installed above the compressor. There, the water evaporates due to the heat that the hot motor-compressor gives off during its normal operation.
☑️ Signs of a faulty defrosting system
The critical element of this system is thermal fuse. It breaks the power supply circuit of the heating element if the temperature in the evaporator area rises above a safe value (usually about 10°C). This prevents plastic parts from overheating and the risk of fire. If the thermal fuse blows, the defrost stops starting, the evaporator becomes overgrown with a “fur coat”, and the cold stops flowing into the chamber.
| Component of the defrost system | Function | Typical malfunction |
|---|---|---|
| Defrost heating element | Heating and melting of ice on the evaporator | Broken spiral, lack of heating |
| Thermal fuse | Overheating protection (break circuit) | Combustion, open circuit of the heating element's power supply |
| Defrost timer | Switching "Cooling/Defrosting" modes | Sticking contacts, stopping in one mode |
| Defrost sensor | Evaporator temperature control | Incorrect resistance readings |
Control system and temperature sensors
Modern Biryusa 151 equipped with an electronic system control, which replaces mechanical thermostats of the previous generation. The system is based on thermistors - resistance sensors that change their electrical characteristics depending on the ambient temperature. Typically, the model has two main sensors: one monitors the air temperature in the refrigerator compartment, the second in the freezer.
The electronic module constantly polls these sensors. If the temperature rises above a preset threshold, the module issues a command to start the compressor. When the required minimum is reached, the power is turned off. This precision allows you to save energy and maintain a stable microclimate. The user sets the desired mode through the control panel on the door, and the “brains” of the refrigerator themselves decide how long to work.
Why is the indicator blinking?
If the temperature or alarm indicator is blinking on the control panel, this is a signal that the temperature in the chamber is higher than normal. This may be caused by opening the door for a long time, loading a large volume of warm food, or a faulty sensor. Check the tightness of the seal.
It is worth noting that the electronics are sensitive to voltage changes in the network. For stable operation controller it is recommended to use surge protectors or voltage stabilizers, especially in the private sector or old houses. Voltage surges can lead to breakdown of the control elements, which will require an expensive replacement of the board.
Features of refrigerant circulation and noise
In the model Biryusa 151 a modern low-noise compressor is used. However, even with high-quality assembly, the operation of the refrigerator is accompanied by a certain background sound. It is important to distinguish between normal operating sounds and signs of trouble. A quiet hum of the motor, a rare crackling of the plastic (thermal expansion) and the sound of flowing liquid in the tubes are considered normal.
The sound of flowing water or gurgling in the tubes after the compressor stops is absolutely normal. It indicates that the refrigerant flows from a high-pressure zone to a low-pressure zone, equalizing the system parameters. Many users mistake this for a water leak inside the refrigerator, but this is freon circulating.
If you hear a loud metallic clang, whistle, or vibration that radiates to the floor, this may indicate problems with the compressor mounting, a fan malfunction, or a foreign object getting into the blades. In such cases, visual diagnostics of the rear of the unit is required. Sometimes it is enough to simply move the refrigerator away from the wall to improve ventilation and reduce noise.
Typical problems and their connection with the device
Understanding the operating principle helps to quickly identify the cause of the breakdown. For example, if the freezer compartment Biryusa 151 is cold and the refrigerator compartment is warm, most likely the problem lies in the air circulation system. The air supply duct may have frozen due to a malfunction in the defrost system, or the fan may have failed. The ice plug blocks the passage of cold air, and it simply does not reach the upper compartment.
Another common scenario is that the refrigerator works non-stop. This indicates that the system cannot reach the set temperature. The reasons may be different: a freon leak, loss of tightness of the door seal, a clogged capillary tube, or a malfunction of the temperature sensor, which “lies” to the control module about the real heat inside.
⚠️ Attention: If you notice that the back wall inside the refrigerator compartment is covered with an uneven layer of ice or “bubbles,” this is a direct sign of a problem case tightness or leakage of thermal insulation, which requires the intervention of a technician.
It is also worth mentioning the problem of the “crying” rear wall in the refrigerator compartment, although this is less typical for the No Frost system. If water does not drain through the drain hole, it may freeze or leak out. The drainage often becomes clogged with crumbs or mold, so it must be periodically cleaned with a special brush or soft wire.
Operation rules for extending service life
In order for a complex mechanism Biryusa 151 to serve for a long time, it is necessary to follow the operating rules dictated by its design. First of all, you should not load hot foods into the chamber. A sudden release of steam will lead to the instantaneous formation of a thick layer of ice on the evaporator, which the defrosting system may not be able to handle in one cycle. This will create extra load on the compressor.
It is important to ensure free air flow to the condenser. The back wall or side panels (depending on the design) must be at least 5-10 cm from the furniture. Overheating of the compressor and condenser sharply reduces cooling efficiency and accelerates wear of the engine oil. Regularly removing dust from the rear grille is a simple but effective preventive measure.
Do not completely clog the air ducts with food. Cold air should circulate freely around the food. If you fill the freezer to capacity, the fan will work with overload, and the temperature in different corners of the chamber will vary greatly. Following these simple recommendations will allow the device to operate in optimal mode for many years.
Why does the Biryusa 151 refrigerator get very hot on the sides?
In modern models, the capacitor is often built into the side walls of the case. Heating of the sidewalls to 40-50 degrees during the first hours of operation or after loading products is the norm. This means that the system actively removes heat. If the walls become hot to the point where it hurts to touch them, check whether the refrigerator is pushed close to the wall and whether the ventilation holes are clean.
How often should Biryusa 151 be defrosted?
Thanks to the No Frost system, scheduled defrosting to remove ice is not required. However, sanitary defrosting for the purpose of washing and disinfecting internal surfaces is recommended 1-2 times a year. Before washing, the device must be unplugged and left open for several hours to remove odors.
What to do if the light is on inside, but there is no cold?
This means that the electrical circuit is intact, but the cooling system is not working. Possible reasons: the compressor is faulty (does not start or hums, but does not pump), the start relay has burned out, or a freon leak has occurred. In this case, independent repair is impossible; you need to call a specialist to diagnose the pressure in the system and check the electrical system.