Professional refilling of Biryusa refrigerator with freon

A decrease in cooling efficiency in brand units Biryusa often becomes an unpleasant surprise for owners. If the compressor operates without interruption and the temperature in the chambers remains high, most likely the circuit has depressurized. In such a situation, it is necessary filling with freonwhich is technically possible to do independently, having a specialized tool.

However, it is worth immediately defining the boundaries of the possible: the process of refrigerant recovery requires not only skills in working with metal, but also adherence to strict safety measures. Refrigerant is in the system under pressure, and improper handling of cylinders can lead to injury. In addition, the entry of moisture or air into the circuit can completely destroy the expensive compressor refrigerant

In this material we will analyze in detail the stages of diagnostics, gas selection and the technological process of charging the system. You will learn what tools are required for the job, how to correctly determine the type of freon for your model Biryusa and why the vacuum stage is critically important. Self-sealing tubes without nitrogen purge in 90% of cases leads to the formation of ice plugs in the capillary.

Diagnostics of leaks and the need for refueling

Before you start looking for tools, you need to make sure that the problem lies precisely in a lack of refrigerant. Sometimes users mistake a thermostat malfunction or a clogged filter drier for a leak. The primary symptom is the continuous operation of the compressor motor, which tries to compensate for the loss of cold, but cannot achieve the set parameters.

Visual inspection can also provide important clues. If oily spots are visible on the evaporator inside the chamber or on the condenser tubes at the back of the unit, this is a sure sign of depressurization. Freon circulates in the system along with oil, so where gas leaves, lubricant often remains. If such marks are detected at joints or welds, immediate intervention is required.

There are several indirect signs indicating a critical decrease in the level of refrigerant in the circuit:

• ❄️ Complete absence of cold in the freezer chamber when the compressor is running.
• 🔥 Excessive heating of the condenser grill housing at the back of the refrigerator (or its cold state).
• 💧 The appearance of ice in only one corner of the evaporator (the “crying” effect is localized).
• 🔊 Change in the sound of the motor - it may become quieter or, conversely, begin to work intermittently.

It is important to understand that freon is not consumed during operation, like fuel in a car. If the gas has escaped, it means that a hole has formed in the system. Simple refueling without finding and eliminating the leak will only give a temporary effect. After a few days or weeks, the problem will return, and the compressor may burn out from overheating due to idling.

⚠️ Attention! If you find a leak in the foamed part of the cabinet (inside the walls of the refrigerator), repairing it yourself is often impractical. Opening the thermal insulation and overcooking the circuit requires factory equipment. In such cases, it is more economical to replace the entire evaporator or consider purchasing a new unit.

To accurately determine the location of the leak, professionals use leak detectors or the soaping method. At home, you can apply a soap solution to all accessible connections, capillary tubes and compressor inlets. The appearance of bubbles will indicate the place where the gas is escaping. After detecting a defect, the tube is cut, sealed or the damaged area is replaced, and then the leaks are checked.

Choosing the type of refrigerant for Biryusa models

Refrigerators Biryusa, produced in different years, could be equipped with different types of refrigerants. Self-refueling is only possible if you know exactly the brand of gas, since mixing different substances is strictly prohibited. Using unsuitable freon will lead to incorrect operation of the system, increased pressure and possible destruction of components.

Most often, two main types of substances are used in household appliances of this brand: R134a and R600a. The first is tetrafluoroethane, which is standard in most modern refrigerators. It is ozone-friendly but requires the use of synthetic oil in the compressor. The second is isobutane, which is a hydrocarbon.

You can determine the type of gas by the sticker located on the back wall of the unit or inside the chamber. It contains technical specifications, including charge weight and refrigerant type. If the sticker is lost or unreadable, you can rely on the year of manufacture and type of compressor, but it is best to rely on the marking of the motor itself.

Comparative table of refrigerant characteristics for refrigerators:

Particular care should be taken during operation s R600a. This is an explosive substance that, when concentrated in air above 1.3%, forms an explosive mixture. Refueling of such models must be carried out in a well-ventilated area, away from open sources of fire and sparking electrical appliances. For R134a, the requirements are less stringent, but ventilation is also necessary.

Is it possible to mix different types of freon?

Absolutely not. Mixing R134a and R600a (or old R12) will cause a chemical reaction, forming acids and solid deposits that will instantly damage the compressor and filter drier. The system will become unsuitable for repair.

Necessary tools and equipment

High-quality refilling of the refrigerator Biryusa is impossible without a specialized set of tools. Attempts to do the job using improvised means usually end with moisture getting into the system or incorrect pressure. The minimum set of a master includes a pressure gauge station, a vacuum pump and tools for working with copper.

The central element of the equipment is gauge station (manifold). It allows you to control the pressure in the circuit and regulate the supply of freon from the cylinder. For domestic use, a simple station with two pressure gauges (blue and red) and a set of hoses is sufficient. It is important that the hoses are designed to work with refrigerants and have appropriate threaded connections.

The second critical device is vacuum pump. Its task is to remove air and moisture vapor from the system. Residual moisture at low temperatures turns into ice and clogs the thinnest capillary, blocking the circulation of freon. Without vacuuming, high-quality filling is impossible.

Full list of necessary equipment:

• 🛠️ Manometric manifold with a set of hoses (preferably with valves).
• 🌀 Vacuum pump (single-stage or two-stage).
• 🔥 Gas torch (propane-butane or oxygen) for soldering copper pipes.
• ✂️ Pipe cutter, pipe expander and pipe cleaner.
• ⚖️ High-precision electronic scales (for dosing freon by weight).

You will also need consumables: solder (silver or copper-phosphorus), flux, a new filter-drier and, in fact, a cylinder with freon. The filter drier is a disposable element that must be changed whenever the circuit is opened. It absorbs moisture and oil breakdown products, protecting the system.

System vacuum technology

Once the leak has been found and repaired, and a new filter drier has been installed, the process of preparing the system for refilling begins. Evacuation is not just “pumping out air”; it is the creation of conditions under which water in the system in the form of steam boils and is removed at room temperature.

The process begins by connecting the hose from the vacuum pump to the service fitting (or to the sealed process of the compressor, if there is no fitting). Before connecting, make sure that the valve on the pressure gauge station is closed. After connection, the valve opens and the pump starts working.

The duration of vacuuming depends on the power of the pump and the volume of the system, but for refrigerators Biryusa usually ranges from 15 to 30 minutes. The completion criterion is the pressure gauge reading: the needle must go into the vacuum zone (usually up to -1 bar or 30 inHg). If the arrow begins to creep up after turning off the pump, it means that there is a leak in the system.

There is an important nuance: if there was a lot of moisture in the system, one vacuum cycle may not be enough. In such cases, the “pushing” method is used: the system is filled with a small amount of freon, allowed to mix with the remaining moisture, and again vacuumed off. However, R600a this method is dangerous due to flammability, so it is better to use a high-quality pump.

⚠️ Attention! Never leave the system exposed to the atmosphere longer than necessary. Copper and oil are hygroscopic and instantly absorb moisture from the air. All soldering and connection operations must be carried out as quickly as possible.

The process of filling with refrigerant

Filling the refrigerator Biryusa with freon is carried out strictly according to the weight indicated on the factory label. A deviation of even 5-10 grams can significantly affect performance. A lack of gas will lead to poor cooling, and an excess will lead to an increase in condensation pressure and overload of the compressor.

For accurate dosage, a freon cylinder is installed on an electronic scale. The hose from the cylinder is connected to the yellow port of the pressure gauge station. Before opening the valve on the cylinder, it is necessary to bleed a small amount of gas from the hose in order to expel the air that entered it during connection.

Refilling with the liquid phase (by turning the cylinder over) is only permissible for single-component freons and only into the compressor when the compressor is turned off, but it is safer and more correct to refill in the vapor phase with the engine running. By opening the valve on the cylinder and the blue valve on the station, you begin to supply gas to the system. During the refueling process, the refrigerator must work.

Monitor the scale readings. As soon as the mass has decreased by the required number of grams, close the valve on the cylinder. Let the system run for 5-10 minutes to allow the pressure to stabilize and check the temperature in different parts of the circuit. The evaporator should be covered with frost evenly, and the condenser should heat up over the entire area.

After gaining the required mass and checking the operation, it is necessary to seal the service tube. To do this, the tube is pinched near the soldering point, sealed with a torch, and only after that the pressure gauge hose is removed. The soldering area is checked with a soap solution for leaks.

Frequent errors and safety precautions

Independent repair of refrigeration equipment is fraught with risks. One of the most common mistakes is neglecting to replace the filter drier. The old sorbent is already saturated with moisture and will not be able to protect the system, which will lead to rapid breakdown. Another mistake is using the wrong oil or excess oil, which interferes with heat transfer.

When working with open flames and gas under pressure, there is always a risk of fire or explosion. This is especially true for models on isobutane (R600a). Before starting soldering, make sure that there are no gas accumulations in the room and provide cross ventilation. Do not smoke in the room where refueling is carried out.

Another common problem is overheating of the compressor during prolonged operation during diagnostics or refueling. If the motor runs dry (without freon) or with the circuit open for too long, it may fail. Let the compressor cool down, take breaks in operation.

Basic safety rules:

• 🔥 Do not solder tubes if there is pressure or flammable gas residues in the system.
• 🧤 Use safety glasses and gloves when working with freon (risk frostbite).
• 🌬️ Provide fresh air, especially when working with R600a.
• ⚡ Monitor the compressor temperature, do not allow it to overheat above 100°C.

⚠️ Attention! Freon is heavier than air and, with a large leak, can displace oxygen in the lower part of the room. If symptoms of suffocation or dizziness appear, immediately leave the room and ventilate it.

Questions and answers (FAQ)

How much freon is needed for the Biryusa refrigerator?

The exact amount is indicated on the factory sticker inside or behind the unit. Typically for mid-volume models this is 60-140 grams depending on the type of refrigerant (R600a requires less than R134a). Refilling "by eye" is unacceptable.

Is it possible to fill a refrigerator with ordinary car freon?

No, it is not possible. Car air conditioners often use R134a freon, but with the addition of special oils and additives not intended for refrigeration systems. In addition, there are different types of oils (POE, PAG, Mineral), and mixing them is detrimental to the compressor.

Why does the refrigerator not freeze after refueling?

There may be several reasons: moisture getting into the system (capillary clogged), incorrect amount of freon (underfilling or overfilling), poor-quality vacuuming or the presence of air in the circuit. Also, the problem may not be in the gas, but in a malfunction of the compressor or thermostat.

Is it dangerous to breathe freon vapors?

In low concentrations, modern freons (R134a, R600a) are not toxic, but they displace oxygen. In high concentrations, suffocation may occur. When heated with an open flame, freons can decompose with the formation of toxic products (phosgene), so soldering must be done with care and ventilation.

Is it necessary to change the oil in the compressor when refueling?

During normal refueling, after eliminating the leak, the oil does not need to be changed if it has not turned black and has not lost its properties. The oil is replaced only when the compressor burns out or when switching to another type of refrigerant that requires a different lubricant composition.