Owners of Russian-made equipment are often faced with a situation where the device stops freezing, although the compressor continues to hum. Refilling the Biryusa refrigerator refrigerant is a process that requires not only special equipment, but also a deep understanding of the thermodynamics of a closed cycle. If you notice that the food is deteriorating and there is no frost on the evaporator or, conversely, a “fur coat” has formed in only one corner, most likely there is a leak of working gas.
Before taking active steps, you need to make sure that the problem lies precisely in the absence of data-i="48">, and not due to a breakdown of the thermostat or start relay. Self-refueling is possible, but it carries risks: the wrong amount of gas or the presence of moisture in the system can permanently damage the unit. In this material we will analyze the technical nuances of restoring the circuit. freon, and not a breakdown of the thermostat or start relay. Self-refueling is possible, but it carries risks: the wrong amount of gas or the presence of moisture in the system can permanently damage the unit. In this material we will analyze the technical nuances of contour restoration.
It is worth understanding that modern models, such as Biryusa 133 KHA 02 or older versions on R12, require an individual approach to the type of refrigerant and oil. Errors at the vacuum stage or mixing different types of oils lead to the formation of acids that corrode the motor windings from the inside. Therefore, carefully study the theoretical part before practice.
⚠️ Attention: All work related to breaking the tightness of the circuit must be carried out in a well-ventilated area, since some types of freons can form toxic substances when in contact with an open flame connections.
Diagnostics of the system and search for leaks
The first step should always be a thorough check for leaks. It makes no sense to pump in new gas if there is a hole left in the pipes through which it will escape in a few days or even hours. Most often, leaks in refrigerators Biryusa are localized in the foamed part of the case or in places where copper tubes are soldered.
For a visual inspection, you need to move the unit away from the wall and remove the back panel. Look for traces of oil: where freon leaks, compressor lubricant often leaks out, collecting dust. If it is not possible to visually find the location of the damage, you will need to use leak detector or a soap solution to check all available connections.
- 🔍 Inspect the condenser grille from the back for swelling or mechanical damage.
- 💧 Check the entry points of the tubes into the housing and the area around the evaporator inside the chamber.
- 👂 Listen: a characteristic hissing may indicate an active release of gas under pressure.
- 🛠 Use a pressure gauge station to monitor the pressure drop in the system.
If a leak is found in an accessible place, it is sealed. However, if the internal circuit or the evaporator sealed in polyurethane foam is damaged, repair becomes economically impractical. In such cases, an external evaporator ("crying") is often installed, which is a standard practice for extending the life of equipment.
Necessary tools and materials
High-quality refueling is impossible without a professional set of tools. You will need not only a gas cylinder, but also a vacuum pump, a manifold, a scale and a burner. Using “homemade” methods, such as filling by eye or through car compressors, is guaranteed to lead to compressor failure.
Particular attention should be paid to the type of refrigerant. For older models Biryusa often used R12, which has now been replaced by analogues, or R134a for newer versions. It is strictly forbidden to mix different types of freons, as this changes the properties of the mixture and can cause an explosive situation or destruction of rubber seals.
| Tool/Material | Purpose | Importance |
|---|---|---|
| Gauge station | Circuit pressure control | Critical importance |
| Vacuum pump | Removal of moisture and air | Required |
| Electronic scales | Accurate gas dosage | High |
| Gas burner | Soldering copper tubes | Required |
| Flux and solder | Sealing of connections | High |
You will also need a new filter drier. This element required must be replaced whenever the system is opened, since the old adsorbent is already saturated with moisture and will not be able to protect the compressor from water hammer. Saving on this component is a direct path to repeated repairs.
The process of evacuation of the system
After eliminating leaks and replacing the filter-drier, the most important stage begins - evacuation. Its purpose is to remove air and, most importantly, water vapor from the circuit. Moisture in the system is lethal: freezing in the capillary tube, it creates an ice plug that blocks the circulation of freon.
Connect the vacuum pump to the service fitting and turn it on. The process should last at least 30–40 minutes, and for large systems or with severe moisture contamination - up to 2 hours. The pressure should drop to values close to absolute vacuum, which will confirm the absence of non-condensable gases.
⚠️ Attention: If, after turning off the pump, the pressure gauge needle creeps up, it means that there is a leak in the system. Repeat checking the seams with a soap solution.
Why should you not skip vacuuming?
The air remaining in the system increases the condensation pressure, which leads to overload of the compressor and its rapid failure. Water causes corrosion of metal parts and oxidation of oil.
After pumping is completed, close the valve on the manifold and only then turn off the pump. This will prevent oil from being drawn back into the system from the pump. Let the system stand under vacuum for about 15 minutes to monitor the stability of the readings.
Refrigerant charging technology
Refrigerator charging Biryusa is carried out strictly according to the weight indicated on the factory tag (usually located inside the chamber or on the back wall). The permissible error is ±5 grams. Exceeding the norm will cause high pressure and poor cooling, and a deficiency will cause overheating of the compressor.
Connect the freon cylinder to the manifold. Open the valve on the cylinder and carefully release gas into the system. Turn on the refrigerator and watch the low pressure gauge. For R134a, the normal suction pressure in operating mode is approximately 0.06–0.08 MPa, but the exact figures depend on the ambient temperature.
- ⚖️ Weigh the gas cylinder before refueling.
- ❄️ Supply freon in small portions, monitoring the weight on the electronic scales.
- 🌡 Monitor the temperature of the condenser: it should warm up evenly.
- 🛑 Turn off the gas supply when the weight decreases by the required value.
During the refueling process, the compressor should work. This allows the gas to be evenly distributed throughout the system and reach operating mode. After filling the norm, clamp the service tube with powerful pipe clamping pliers and seal it, first disconnecting the hoses.
Operation control and leak testing
After soldering the service tube, you need to make sure that the connection is tight. Apply a generous amount of soapy water to the soldering area and turn on the unit. The appearance of bubbles will indicate a defect that must be eliminated immediately. If everything is clean, wipe the tube dry.
Now comes the stage of checking the quality of cooling. Start the refrigerator without load (empty) and let it run for 2-3 hours. The temperature in the freezer should drop to nominal values (usually -18°C and below), and coldness should appear on the shelves of the main chamber.
Pay attention to the operation of the compressor. It should not run continuously without shutting down (unless you have turned on the Super Freeze mode). Cyclic operation is a sign of serviceable automation and the correct amount of refrigerant.
☑️ Final check after filling
Typical errors during self-repair
One of the most A common mistake is to try to fill the refrigerator “until it’s full”, ignoring the scale. Excess freon leads to liquid refrigerant entering the compressor, causing water hammer and destruction of valves. Refilling is just as dangerous as underfilling.
Another mistake is ignoring the replacement of the filter-drier or using an old, “calcined” one. in the oven. A modern filter contains zeolite, which loses its properties after contact with air. Installing a used filter will negate all evacuation efforts.
Also, amateur technicians often forget to check the oil in the compressor. If the leak lasted for a long time, some of the oil could escape along with the gas. In this case, you will need to add synthetic oil (POE) or completely replace the compressor if the oil level is critically low.
⚠️ Attention: Specifications and acceptable types of refrigerants may vary depending on the model year. Always check the official technical documentation of the manufacturer for your specific modification.
Frequently asked questions (FAQ)
Is it possible to refill a Biryusa refrigerator with a car freon?
Absolutely not. Automotive freons (often with added dyes or UV tags) and oils have a different chemical composition. Their use in household appliances will lead to the destruction of rubber seals and failure of the compressor.
How many grams of freon do you need for a Biryusa refrigerator?
The exact amount is indicated on the factory sticker (nameplate) on the case. Usually for two-chamber models this is 130–160 grams of R134a, but there may be exceptions depending on the volume of the chambers and the year of manufacture.
Why does the refrigerator freeze after refueling, but does not turn off?
This may indicate a phason leak (insufficient amount of gas), a clogged capillary tube or a malfunction of the thermostat. Also, the reason may be a violation of the door seal or wear of the seal.
Does the system need to be flushed when replacing a compressor?
Yes, if the old compressor burns out, combustion products and acidic compounds remain in the system. Flushing with nitrogen is mandatory, otherwise the new motor will burn out after a few months of operation.