A decrease in the efficiency of the refrigeration unit often indicates refrigerant leakage, and in the case of domestic equipment Biryusa this is a common problem. Many owners, wanting to save on calling a technician, think about filling the circuit themselves, but this process requires not only special equipment, but also a deep understanding of the physics of the processes. Freon is the working fluid of the system, and its correct amount is critical for heat circulation.
Before taking active steps, you need to realize that simply pumping gas into the system without prior preparation will only lead to short-term results or breakdown of the compressor. In the article we will analyze in detail why there may be no pressure in the system, how to find the leak and how a professional refilling or complete replacement of the refrigerant occurs. Ignoring evacuation technology can be fatal for the engine.
It is important to understand that modern models Biryusa can operate on different types of refrigerants, and mixing them is strictly prohibited. Incorrectly selected gas or incorrect proportions when filling the mixture (if an analogue is used) can lead to a fire or explosion, especially if we are talking about flammable substances. The exact brand of refrigerant is always indicated on the technical sticker located on the back wall or inside the chamber.
Leak diagnostics and equipment preparation
The first step before any manipulation of the refrigerant is to accurately determine the presence of a leak and localize the damaged area. Simply adding gas to a system where there is a fistula or crack is pointless - it will come out within a few hours or days. For diagnostics, a soap solution is used, which is applied to the soldering areas, the filter drier and the entire visible perimeter of the tubes coming from the compressor.
If a visual inspection does not produce results, professionals use electronic leak detectors or ultraviolet additives in the oil, but at home they are often limited to monitoring the pressure with a pressure gauge during the day. Nitrogen under pressure is the master’s best friend, so how it allows you to find even microscopic holes without leaving traces of corrosion inside the system, unlike oxygen.
To carry out the work, you will need a specific set of tools, which the average user rarely has lying around in the garage. Without a vacuum pump and a filling station with scales or a pressure gauge column, it is not worth undertaking repairs, since it is impossible to determine the amount of gas by eye.
- 🛠️ A pressure gauge station - a device with two scales (low and high pressure) for monitoring the process.
- 🌀 Vacuum pump - is necessary to remove air and moisture from the circuit before refilling.
- ⚖️ Electronic scales —required for accurately weighing the amount of refilled freon.
- 🔥 Burner and solder —for sealing the process pipe and eliminating detected leaks.
⚠️ Attention: Using an open flame near a refrigerator requires extreme caution. Make sure that there are no flammable vapors in the room, and that the unit itself is disconnected from the power supply.
After identifying and eliminating the leak (usually soldering a copper tube or replacing the evaporator), the system must be thoroughly purged with nitrogen. This action allows you to displace the remains of old oil, combustion products during soldering and moisture that could get inside during depressurization.
Choice of the type of refrigerant for Biryusa models
Refrigerators Biryusa of different years of production could be equipped with compressors operating on different types of refrigerants. The most common in older models was freon, which had excellent refrigeration properties, but was banned for use due to its destructive effect on the ozone layer. data-i="80">(isobutane). The latter is natural gas, it is environmentally friendly and economical, but is highly flammable. Replacing one type of freon with another without changing the oil in the compressor and filter-driers is strictly prohibited, since they have different chemical compatibility. R-12 (freon), which had excellent refrigeration properties, but was banned from use due to its destructive effect on the ozone layer.
Modern units are most often refueled R-134a or R-600a (isobutane). The latter is natural gas, it is environmentally friendly and economical, but is highly flammable. Replacing one type of freon with another without changing the oil in the compressor and filter-driers is strictly prohibited, since they have different chemical compatibility.
You can determine the required type of gas by color compressor marking or technical sticker. R-12 was typically charged into mineral oil systems, while R-134a requires synthetic oil PAG or POE. R-600a also works on synthetics, but requires special attention to the tightness of electrical contacts.
| Refrigerant type | Chemical name | Features | Oil compatibility |
|---|---|---|---|
| R-12 | Dichlorodifluoromethane | Obsolete, non-flammable | Mineral |
| R-134a | Tetrafluoroethane | Eco-friendly, non-flammable | Synthetic (POE/PAG) |
| R-600a | Isobutane | Flammable, explosive | Synthetic (POE) |
If you plan to convert the system from R-12 to R-134a (which is sometimes done by craftsmen in the absence of original freon), it is necessary to completely flush the system, replace the compressor or oil and install a new filter drier. However, for Turks it is better to adhere to factory specifications so as not to disrupt heat transfer.
Technology for vacuuming the system
Vacuuming is a critically important step that many beginners ignore, believing that it is enough to simply bleed off the residue air. There should be nothing left in the system except pure refrigerant, since the air contains moisture and nitrogen, which at low temperatures turn into ice plugs or acidic compounds.
The process begins by connecting the vacuum pump to the compressor process pipe through a manometric manifold. After turning on the pump, the pressure in the system begins to drop. It is necessary to achieve a vacuum indicator close to absolute zero, which is confirmed by the pressure gauge needle going into the blue zone (below -1 bar).
☑️ Vacuum checklist
The duration of the vacuum process depends on the volume of the system and the power of the pump, but for household refrigerators Biryusa usually ranges from 30 to 50 minutes. If, after turning off the pump, the pressure gauge needle begins to creep up, this indicates a leak in the circuit, and the leak search must be repeated.
⚠️ Attention: Before turning off the vacuum pump, be sure to close the valve on the manifold. Otherwise, oil from the pump may be drawn back into the refrigerator system, which will require a complete flush.
Moisture remaining in the system reacts with the refrigerant and oil, forming aggressive acids that corrode the compressor windings from the inside. That is why filter-drier the circuit is changed every time the circuit is opened, and it cannot be reused.
The process of filling the refrigerator with freon
After successful vacuuming, the filling stage begins. There are two main methods: weight charging and pressure/temperature charging. The most accurate and recommended by the manufacturer Biryusa is the weighing method, since the amount of gas is strictly regulated for each model.
The freon cylinder is installed on an electronic scale, and the readings are reset or recorded. By opening the valve on the manifold, gas is supplied into the system in small portions. It is important not to open the valve completely, so as not to damage the compressor valves by the hydraulic shock of liquid freon.
Why can’t you refill “by eye”?
The amount of refrigerant affects the boiling and condensation pressure. Excess freon will cause liquid gas to enter the compressor, causing water hammer and valve knocking. A lack of freon will lead to overheating of the motor and insufficient cooling of the chamber. Dosage accuracy is the key to the long life of the unit.
During the refueling process, the refrigerator must be plugged in so that the compressor begins to pump gas out of the cylinder. Monitor the readings of the low pressure gauge: for R-134a the operating pressure is usually about 0.1–0.2 MPa, and for R-600a it is lower and is often in the zone of vacuum or slight overpressure, depending on the ambient temperature.
The optimal moment is when a uniform layer of frost appears on the evaporator (inside the freezer), and the temperature on the shelves begins to decrease according to the norm. Overflow systems can be easily noticed by the freezing of the tube at the outlet of the compressor or at the suction section - this is a signal to immediately stop the gas supply.
Sealing the service pipe and checking
When the required amount of freon filled, it is necessary to hermetically seal the process pipe. To do this, use the same solder and torch as for repairs. It is important to do this quickly while the compressor is running in order to create a slight excess pressure and prevent air leaks when the hose is disconnected.
First, the tube is clamped with a clamp (if the material allows) or the hose connection point is simply quickly sealed. After the soldering area has cooled, check the connection with a soapy solution for bubbles. Any micro-leakage will negate all previous work.
After final assembly and checking for leaks, the refrigerator is left turned on for several hours to stabilize temperature conditions. Only after the unit turns off upon reaching the set temperature and turns on again can the repair be considered complete.
Common mistakes when refueling yourself
Independent repair of refrigeration equipment is full of risks, and even experienced craftsmen sometimes make mistakes, not to mention beginners. One of the most common problems is insufficient evacuation time, which leads to the presence of moisture in the system and eventual corrosion.
Using the wrong oil or mixing different types of oils is also common. Systems with R-134a and R-600a use hygroscopic synthetic oil, which instantly absorbs moisture from the air, so all work must be carried out as quickly as possible.
- ❌ Ignoring filter replacement —an old dehumidifier will not be able to remove moisture that entered during installation.
- ❌ Refilling with the compressor turned off — leads to liquid freon entering the crankcase and hydraulic shock during startup.
- ❌ Using propane instead R-600a —household gas has different boiling characteristics and can be dangerous in high concentrations.
⚠️ Attention: Technical characteristics and requirements for refrigerants may vary depending on the specific modification of the refrigerator. Always check the official technical documentation of the manufacturer for your model Biryusa.
Remember that saving on calling a specialist can result in the purchase of a new compressor or an entire refrigerator. If you are not confident in your abilities or do not have a complete set of equipment, it is better to entrust this work to professionals.
FAQ: Frequently asked questions
Is it possible to refill a Biryusa refrigerator freon from a can for refilling air conditioners?
No, this absolutely cannot be done. Automotive air conditioning refrigerants (often R-134a) may contain additives that are not compatible with refrigeration compressor oil. In addition, in such cans it is impossible to control the exact weight of the refill, which is critical for a household refrigerator.
How many grams of freon is needed for a Biryusa refrigerator?
The amount of refrigerant is individual for each model and is indicated on the factory sticker (usually from 60 to 150 grams). Refilling “by eye” or by pressure without taking into account the weight often leads to incorrect operation of the unit.
Why does the refrigerator not freeze after refueling?
There may be several reasons: insufficient vacuum (an air lock remains), blockage of the capillary tube with moisture or ice, malfunction of the thermostat or compressor, or incorrect selected brand of freon.
Is it dangerous to change R-600a freon yourself?
Yes, it is dangerous. Isobutane (R-600a) is a flammable gas. At concentrations in air from 1.3% to 8.5% it forms an explosive mixture. Any spark when soldering or turning on the relay can lead to ignition. Working with R-600a requires professional ventilation and equipment without sparking.