The situation when the refrigerator stops freezing and the compressor hums without interruption often indicates a refrigerant leak. Many owners of household appliances, wanting to save on the services of a service center, ask themselves: is it possible to refill them yourself freon? In theory, this process looks simple: connect the cylinder, open the valve and wait for the result. However, in practice, self-refueling is associated with serious technical risks and safety requirements.
Before taking active steps, it is necessary to clearly understand that the lack of cold does not always mean a lack of gas. In the system Indesit or LG the capillary may be clogged, the thermostat is faulty or the compressor itself has failed. Freon circulates in a closed circuit and is not consumed during operation, so its leak is always a sign of a violation of the system’s tightness. If you have not found and repaired the leak, any refill will only be a temporary measure that will quickly stop working.
Modern refrigerators often use complex mixtures of refrigerants, such as R600a (isobutane), which is explosive. Working with such substances requires not only special equipment, but also strict adherence to safety precautions. Errors in dosage or technology can lead to failure of an expensive compressor or even fire. Therefore, when weighing the decision to repair yourself, it is worth soberly assessing your skills and the availability of tools.
Diagnostics and search for refrigerant leaks
The first step before any refilling is to find the place where the gas leaves the system. You can’t just add freon “for prevention.” It is rarely possible to detect a leak visually, since the gas is colorless and odorless. However, there are indirect signs that indicate a problem. For example, if you notice oily stains on the floor under the refrigerator or on the compressor pipes, this is a sure sign of depressurization. The oil comes out along with gas under pressure.
To accurately detect micro-cracks, professionals use leak detectors or the soaping method. At home, you can use a soap solution by applying it to suspicious areas of pipes and joints. The appearance of bubbles will indicate where the gas is escaping. Particular attention should be paid to the evaporator, which is often hidden inside the wall of the refrigeration chamber and can be damaged by careless defrosting with a sharp object.
⚠️ Attention: If a leak is found in the foamed part of the housing (the evaporator inside the wall), independent repair is almost impossible without damaging the thermal insulation. In such cases, you need to call a technician with special equipment to insert a new evaporator.
After detecting and eliminating a physical leak (by soldering or replacing the unit), the system must be checked for leaks under nitrogen pressure. This is a critical step that is often overlooked by hobbyists. If you skip the nitrogen test, moisture or air may enter the system, which will lead to the formation of an ice plug in the capillary and breakdown of the compressor in a short time.
Necessary equipment and tools
For high-quality refilling of the refrigerator Atlant or Bosch a regular set of nuts the keys will not be enough. You will need specialized equipment that allows you to control the process and maintain precise parameters. Without a vacuum pump, for example, it is impossible to remove air and moisture vapor from the system, which inevitably remain after opening the circuit.
The basic set of tools should include a pressure gauge manifold (gauge station). This device allows you to see the pressure in the system and control the injection process. You also need a vacuum pump to create a deep vacuum, a scale for precise dosing of the refrigerant, and a cylinder with the appropriate type of freon. Don’t forget about tools for soldering copper pipes if you need to replace the filter drier or repair the pipeline.
The choice of filter drier deserves special attention. This element must be replaced whenever the system is opened, since the old filter is already saturated with moisture and will not be able to work effectively. Using an old filter drier is one of the most common causes of repeated breakdowns after self-repair.
Selection of refrigerant type and correspondence table
Using the wrong refrigerant can lead to catastrophic consequences for the compressor. Different types of freons have different chemical properties, operating pressures and oil requirements. For example, R134a requires synthetic oil, and for R12 mineral oil. Mixing different types of oils or freons is unacceptable.
To determine what kind of gas your refrigerator needs, look at the technical sticker (nameplate), usually located inside the chamber or on the back wall of the unit. The type of refrigerant and its exact amount in grams are indicated there. Charging "by eye" or until a certain pressure is reached without weighing often leads to incorrect operation of the unit.
| Refrigerant type | Chemical name | Features | Pressure (at 25°C) |
|---|---|---|---|
| R134a | Tetrafluoroethane | Eco-friendly, requires synthetic oil | ~6.5 bar |
| R600a | Isobutane | Explosive, small amount in the system | ~3.5 bar |
| R12 | Dichlorodifluoromethane | Outdated, prohibited in new models | ~6.0 bar |
| R404a | Freon mixture | Used in industrial and old models | ~10.5 bar |
When working with R600a special care must be taken. This gas is heavier than air and, if leaked, accumulates at low points, creating explosive concentrations. Any spark from the compressor relay or socket can cause a popping noise. This is why many craftsmen refuse to repair such systems at home without a hood and a non-sparking tool.
The process of vacuuming the system
Vacuuming is perhaps the most important stage on which the durability of the repair depends. The purpose of this process is to remove all air and, more importantly, moisture vapor from the circuit. Water that enters the system freezes in a narrow capillary, forming an ice plug that blocks the circulation of freon. In addition, moisture reacts with oil and freon, forming acid, which corrodes the compressor windings from the inside.
The process is as follows: a pressure gauge station is connected to the service fitting, and a vacuum pump is connected to it. After turning on the pump, the pressure gauge needle should go to negative, indicating a deep vacuum. The operating time of the pump depends on the power of the equipment and the volume of the system, but is usually at least 30–40 minutes. For household refrigerators, the residual pressure should be minimal.
☑️ Checklist before vacuuming
There is a common misconception that you can purge the system with freon itself instead of using a vacuum pump. This is strictly forbidden. Blowing does not remove moisture accumulated on the walls of the tubes, and does not create the conditions for water to boil at low pressure, which is necessary for its removal. Only a deep vacuum guarantees a dry system.
Filling technology and dosage
After successful vacuuming, the filling stage begins. Accuracy is critical here. The amount of refrigerant must correspond to the grams indicated by the manufacturer on the nameplate. A deviation of even 10–15 grams can disrupt the operation of the refrigerator. An excess of freon leads to an increase in condensation pressure and overload of the compressor, and a deficiency leads to insufficient cooling and overheating of the motor.
It is most convenient to refill in the liquid phase, turning the cylinder over, if the type of refrigerant and valve design allows it, but often scales are used for accuracy. The cylinder is placed on an electronic scale, and you control the mass of gas entering the system. The process must be carried out slowly, allowing the freon to be distributed throughout the system to avoid water hammer in the compressor.
During operation, the compressor must be turned on. Freon is sucked in through low pressure. Monitor the temperature of the suction tube (it should be lukewarm or room temperature, but not hot or frosted all the way to the compressor). If the tube going to the compressor is covered with frost, this is a sign of an excess of freon or problems with evaporation.
Completing the work and checking the tightness
When the required amount of refrigerant is pumped in, it is necessary to close the valve on the cylinder and let the system run for several minutes to stabilize the parameters. Then, while the compressor is running, you need to clamp the filling tube with a special clamp and solder it. This must be done quickly and carefully so as not to release excess gas and not let air in.
After soldering and cooling the joint, be sure to conduct a final leak test using a soap solution. Make sure there are no bubbles in the soldering area. Only after this can you install a protective cap on the fitting (if it is provided for in the design) and turn off the refrigerator from the network for final testing.
⚠️ Attention: Do not solder the tube if the compressor is turned off and excess pressure remains in the system. This can lead to splashing of oil and freon, as well as to air getting inside during cooling.
The final stage is to check the operation of the refrigerator in normal mode. Leave the unit turned on for several hours (preferably a day) without loading food. Check the uniform cooling of the chambers, the absence of extraneous noise and the correct shutdown of the compressor when the set temperature is reached.
What to do if after refueling the refrigerator does not freeze?
If after refueling the refrigerator works, but does not freeze, there are several possible reasons: incorrect dosage of freon (too little or too much), the presence of an air lock in the system, Thermostat is faulty or the capillary tube is clogged (often with dirt or oil). The problem may also be a leak if the leak was repaired poorly. In such cases, repeated diagnostics and, possibly, a complete refill with filter replacement are required.
Frequently asked questions (FAQ)
Is it possible to fill a refrigerator with freon without a vacuum pump?
Theoretically, you can try to expel the air with the freon itself, but in practice this leads to moisture getting into the system. The moisture freezes in the capillary and the refrigerator stops freezing after a few days or weeks. Evacuation is a mandatory step for long-lasting repairs.
How much does it cost to refill a refrigerator yourself?
The cost consists of the price of the equipment (pump, station, burner), which is purchased at a time, and the cost of consumables (freon, filter, solder). For one repair, this often turns out to be more expensive than calling a technician if you do not have experience and tools.
Why does the refrigerator freeze only in the freezer after refueling?
This may indicate an incorrect dosage of freon, the presence of an air lock in the system, or a partial blockage of the capillary tube. It is also possible that there was more than one leak, or the filter drier was clogged and now creates resistance.
Is it dangerous to change freon in a refrigerator with R600a gas yourself?
Yes, it is dangerous. Isobutane (R600a) is explosive. With a concentration in air of only 1.3% - 8.5%, any spark (from a relay, switch, static electricity) can cause an explosion. You need to work with it only in a well-ventilated area and in compliance with fire safety measures.
Is it necessary to change the oil in the compressor when refueling?
During normal refueling, the oil is not changed. Its replacement is only required if the compressor burns out or if a large amount of moisture and acid has entered the system, which requires flushing the circuit. In normal mode, the oil lasts the entire life of the unit.