The situation when refrigerator stops freezing, but the compressor works almost without interruption, most often indicates a refrigerant leak. Many owners of household appliances immediately think about refilling freon themselves, relying on videos on the Internet. However, this process requires not only theoretical knowledge, but also the presence of specialized equipment, which not every home has.
Before taking active steps, you need to understand that refilling the refrigerator is a technically complex process associated with working under pressure. Improper handling of refrigerant can lead to compressor failure or even system explosion. In this article, we will analyze in detail the stages of work, the necessary tools and nuances that are often missed in amateur videos.
The main difficulty lies not so much in filling the system with gas itself, but in the preliminary preparation of the circuit. Evacuation and finding leaks are critical steps, without which refueling makes no sense. If air or moisture remains in the system, the compressor will fail in a matter of days.
⚠️ Attention: Freon, even in small quantities, can release toxic substances (phosgene) when in contact with an open flame or hot surfaces. Work should be carried out in a well-ventilated area.
Necessary tools and preparation of the workplace
To perform the work efficiently, you will need to collect a whole arsenal of professional equipment. Just buying a gas cylinder from a store is not enough; a whole system is needed to control pressure and vacuum. The main tool is a pressure gauge station, which allows you to see the pressure in the system and control the injection process.
In addition, you will definitely need vacuum pump. It is used to remove air and moisture from the circuit before charging. Without this step, the refrigerant will not work efficiently and moisture within the system will freeze in the capillary tube, creating an ice lock. You will also need scales to accurately weigh the amount of gas, since filling “by eye” is unacceptable.
- 🛠️ Manometer station with a set of hoses (red, blue, yellow).
- 🌀 Vacuum pump with a capacity of at least 2 cubic m/hour.
- ⚖️ Electronic scales with an accuracy of 1 gram.
- ✂️ Pipe cutter, rolling machine and torch for soldering copper tubes.
Particular attention should be paid to the choice of refrigerant. Modern refrigerators use different types of gases: R134a, R600a (isobutane) or older ones R12. Using the wrong freon is guaranteed to damage the equipment. Before purchasing a cylinder, carefully study the tag on the compressor of your refrigerator.
Finding and eliminating refrigerant leaks
The most common mistake of beginners is an attempt to refill the refrigerator, ignoring the cause of gas loss. If a hole has formed in the system, the new freon will simply evaporate after a while. Therefore, the first step should always be defection searching for the leak. Most often it occurs in the foamed part of the housing or in the evaporator.
To search, use the nitrogen pressure test method. The system is filled with nitrogen under pressure and the pressure gauge is left for several hours. If the arrow falls, it means there is a leak. To visualize the gas outlet, use a soap solution or a special electronic leak detector. At home, soap emulsion is often used, applying it to suspicious joints.
⚠️ Attention: It is strictly forbidden to use oxygen or ordinary air from a compressor for pressure testing. Oxygen mixed with compressor oil forms an explosive mixture, and moisture in the air will destroy the system from the inside.
If the leak is found in an accessible place, for example, on the tube discharge or in the area of the visible evaporator, it can be soldered. However, if the damage is hidden in the wall of the refrigerator, repairs become economically impractical. In this case, it is easier to buy new equipment than to cut out a piece of the body and change the entire heat exchanger.
Why can’t you just add freon?
Adding freon without vacuuming and looking for leaks is a temporary solution. The air remaining in the system creates high pressure, which leads to overload of the compressor. Moisture causes corrosion and the formation of acids, which corrode the motor winding from the inside.
The process of evacuation of the refrigeration system
After eliminating the physical leak and replacing the filter-driers, the turn of evacuation begins. This stage is critical for the longevity of the unit. Vacuum pump connects to the service fitting, and all air is pumped out of the system. The pressure should drop to minimum values, which will confirm the tightness of the circuit.
The process usually takes from 20 to 40 minutes, depending on the power of the pump and the volume of the system. It is important to monitor the readings of the pressure gauge: the needle should confidently go into the “green” or even “red” zone (vacuum). If, after turning off the pump, the pressure begins to increase, it means that the seal is broken, and the soldering or leak detection procedure must be repeated.
During evacuation, not only air is removed from the system, but also water vapor that could get there during repairs. Residual moisture at low temperatures turns into ice and clogs the thinnest capillary tube. This causes the refrigerator to stop cooling, although the compressor is humming.
☑️ Evacuation checklist
Technology for refilling the refrigerator with freon
Only after successful vacuuming can you begin refilling. There are two main methods: filling by weight and filling by pressure (current). The most accurate and safe method for modern models is refills by scale. The exact number of grams of refrigerant is always indicated on the compressor tag or in the technical documentation.
The freon cylinder is installed on the scales, the hose from the station is connected to the cylinder. By opening the valve, gas is released in small portions, monitoring the readings of the scales. Refilling is carried out with the compressor turned off, in the liquid phase.
For different brands of refrigerators (Indesit, Bosch, LG, Atlant), refueling rates may differ. Below is a table with approximate data, but always check the data sheet for your specific model.
| Refrigerant type | Suction pressure (bar) | Approximate charge weight | Features |
|---|---|---|---|
| R134a | 0.06 - 0.08 | 60 - 140 g | Requires synthetic oil, hygroscopic |
| R600a (Isobutane) | 0.04 - 0.06 | 30 - 60 g | Explosive, filling only by scale |
| R12 (Obsolete) | 0.08 - 0.10 | 100 - 200 g | Used in older models before 2000 |
After filling the system required amount of gas, you need to carefully remove the hose with a quick release to minimize losses. The compressor is then sealed. The start-up is not carried out immediately, but after checking all connections with a soap solution for bubbles.
Monitoring operation and setting up the system
After turning on the refrigerator for the first time, do not expect instant results. The unit may take from 2 to 5 hours to reach operating mode and freeze food. At this time, it is necessary to periodically check the condenser temperature (the grilles at the back) and the evaporator inside the chamber.
The tube at the outlet of the compressor (discharge) should be hot, and at the inlet (suction) it should be slightly cool, perhaps even with condensation (“dew”) appearing. If the suction tube is covered with frost right up to the compressor, it means there is an excess of freon. If the tube is dry and warm, there is a shortage.
⚠️ Attention: Information about normal pressure in the system may vary depending on the ambient temperature and the specific compressor model. It is always a priority to focus on the technical data sheets of manufacturers (Danfoss, Secop, Embraco), rather than on average data from the Internet.
It is also worth listening to the operation of the motor. It should work cyclically: turn on, gain speed, work for a while and turn off according to a signal thermostat. If the compressor hums continuously and does not turn off, the leak may not have been completely eliminated or the capillary system is clogged.
Frequent errors and safety measures
Independent repair of refrigerators is full of risks. One of the common mistakes is ignoring the replacement filter drier. When the system depressurizes, moisture gets inside, which the old filter can no longer retain. Installing a new filter is required whenever the circuit is opened.
Another problem is the use of the wrong oil. Freon R134a requires polyester oil (POE), which is very hygroscopic (absorbs moisture). If you leave a system with such oil open in the air, it will instantly become saturated with water, which will lead to breakdown. Old freons (R12, R22) worked on mineral oil, which is less demanding.
- ❌ It is forbidden to mix different types of freons (for example, adding R134a to a system where there was R12).
- ❌ Do not pinch copper tubes with pliers without rolling - only soldering.
- ❌ Do not run the compressor without load (without freon) for more than a few seconds - it will burn out.
Remember that savings calling a technician can backfire if you damage an expensive compressor or start a fire. If you are not confident in your soldering skills or do not have a vacuum pump, it is better to entrust this work to professionals.
Is it possible to refill a refrigerator without scales?
Theoretically, experienced craftsmen can determine the amount of freon by the current consumption of the compressor and the temperature of the tubes. However, for a beginner, this is almost impossible to do accurately. An error of 10-15 grams for low-power systems (especially on R600a) is critical.
Questions and answers (FAQ)
How much does it cost to fill a refrigerator with freon yourself?
The cost is the price of a freon cylinder (from 1000 to 3000 rubles), rental or purchase of a pressure gauge station and a vacuum pump (from 5000 rubles for a budget set or rental from 500 rubles/day), as well as consumables (solder, flux, filter drier). As a result, savings compared to calling a specialist may be questionable if you do not have the equipment.
How to determine what kind of freon was in the refrigerator?
Information about the type of refrigerant and its quantity (in grams) is always indicated on a metal tag that is attached to the compressor or to the inner wall of the refrigerator compartment. Also, the type of freon can be determined by the color of the markings of the fittings or the color of the cylinder, but the tag is the most reliable source.
Why does the refrigerator freeze after refilling, but does not turn off?
This may indicate several problems: the leak is still present (underfilling), the capillary system is clogged, the thermostat or temperature sensor is faulty, or in the system there was air left. Also, the cause may be wear and tear on the compressor, which does not create the required pressure.
Is it dangerous to breathe freon vapors?
Freons are heavier than air and displace oxygen. In high concentrations they cause suffocation. In addition, when heated above 250°C, some freons decompose and release phosgene, a chemical warfare agent. Therefore, you need to solder carefully, without overheating, and in a ventilated room.