When ice stops forming in the refrigeration chamber, and food begins to deteriorate faster than usual, the owner’s first suspicion is a refrigerant leak. However, the question of how much freon to fill into a refrigerator does not have a universal answer, since each unit is designed for a specific volume and type of gas. An attempt to fill “by eye” or by analogy with a neighbor’s appliance can lead to compressor breakdown or complete failure of the cooling system.
Modern models Indesit, Beko or LG use different refrigerants, such as R600a or R134a, and require the most precise dosage. An error of even 10-15 grams can disrupt the thermodynamic cycle, turning an effective refrigerator into a useless box. In this article we will look at how to determine the required amount of gas, where to look for factory parameters and why self-refueling without a scale and a pressure gauge is impossible.
Factory parameters and where to look for them
The first thing you need to do before starting any maintenance work is to find technical documentation. The manufacturer always indicates the exact amount of refrigerant required for the correct operation of the system. This information is not taken out of thin air, but is calculated by engineers based on the volume of the evaporator, condenser and compressor power.
Usually, data on how many grams of freon is needed is applied to a special sticker. It can be located on the rear wall of the case, inside the refrigerator compartment on the side wall or on the base panel. Look for a line marked Charge or Refrigerant, next to which the quantity in grams will be indicated (for example, 130g ± 5g).
What to do if the sticker has worn off?
If the nameplate is unreadable or lost, the exact dosage can be found in the service instructions (service manual) for a specific model. You can also try to find the technical data sheet of the device on the Internet using the full model number, which is duplicated on the compressor nameplate or in the warranty card.
It is important to understand that the weight of the refrigerant is strictly tied to a specific model. You cannot rely on the volume of the refrigerator in liters. single-chamber Atlant and single-chamber Stinol may have a similar internal volume, but completely different filling due to different circuit lengths and oil type.
⚠️ Attention: Never try to determine the amount of freon by the residual pressure in the system. Pressure depends on the ambient temperature and is not a direct indicator of the mass of gas in the system. circuit.
Types of refrigerants and their features
The amount of the substance charged directly depends on its chemical composition. In modern household refrigerators, mainly two types of gases are used, each of which has its own physical properties and requirements for the accuracy of charging.
The most common today is isobutane (R600a). This is a flammable gas that requires special care when working. Its advantage is its high efficiency, but the disadvantage is that the system must be completely sealed. The dosage R600a is usually very small - from 30 to 60 grams for standard models.
The second popular option is R134a (tetrafluoroethane). This gas is not flammable and less toxic, but requires a larger amount for refilling (usually from). 90 to 150 grams). It operates at a higher pressure, so old pressure gauges for R12 will not work here - the scales will be different.
- 🧊 R600a: used in 80% of new refrigerators, requires evacuation before filling, very sensitive to the cleanliness of the system.
- ❄️ R134a: standard for middle-aged equipment, requires synthetic oils, does not destroy the ozone layer.
- 🚫 R12: obsolete freon, the refilling of which is now prohibited or limited in many countries due to environmental friendliness.
Why accurate dosage is important
Many amateur craftsmen mistakenly believe that a slight excess of the norm (“just enough”) will not hurt. In fact, an excess. freon is as dangerous as its shortage. Hydraulic shock of liquid refrigerant can instantly damage the compressor valves.
If you fill less than normal, the compressor will work continuously, trying to gain temperature. This will lead to overheating of the windings and thermal rupture. In addition, the oil in the system circulates along with freon, and when the gas level is low, the rubbing parts are lubricated. will be disrupted.
The table below shows approximate values for popular brands, but always check the sticker on your device:
| Refrigerator model | Freon type | Factory standard (g) | Tolerance (g) |
|---|---|---|---|
| Indesit EF 18 | R600a | 38 | ±2 |
| Beko CN 327 | R600a | 45 | ±2 |
| LG GA-409 | R600a | 52 | ±2 |
| Atlant MHM 2808 | R134a | 110 | ±5 |
| Stinol 102 | R134a | 140 | ±5 |
Refilling process: steps and tools
The process of replenishing the refrigerant is technically complex and requires specialized equipment. You cannot simply connect the cylinder and open the valve - the system must be prepared. The first step is always to find and eliminate the leak, otherwise the gas will leave again in a few days or weeks.
After soldering the damaged area, it is necessary to evacuate the circuit. This is necessary to remove moisture and air, which, when mixed with oil, form an acid that destroys the system from the inside. The vacuum pump must run for at least 15-20 minutes until the pressure reaches -1 bar.
☑️ Preparation for refilling with freon
Refilling is carried out strictly according to the scales. The cylinder with freon is placed on precise electronic scales, and the master monitors the gas supply process. when the readings change. As soon as the arrow reaches the desired value (for example, 45 grams have been consumed), the supply is shut off. Using only a pressure gauge station without scales is considered a gross mistake.
⚠️ Attention: If you do not have the skills to work with an open fire (burner) and soldering copper pipes, repairing the freon circulation system yourself is prohibited. This is a fire hazard and requires. licenses.
Symptoms of incorrect amount of freon
How to understand that the amount of gas in the system deviates from the norm? There are clear signs that can indicate a problem even before the refrigerator completely stops. Ignoring these signals leads to expensive repairs.
When underfilling you will notice that the compressor works almost without stopping, the humming becomes more strained. The evaporator (the back wall inside the chamber) is covered with ice unevenly, often only at the entrance of the tube, and the rest of the product in the upper part of the chamber may not cool to the desired temperature.
When overflow the situation is different. The compressor may turn on and off frequently, or operate with strong vibration. Frost or ice may appear on the condenser tubes (grid at the back), which should not happen. In extreme cases, the sound of gurgling or overflowing liquid is heard, and the refrigerator stops freezing altogether due to a blockage in the system.
Common mistakes when refueling yourself
Attempts to save on the services of a service center often lead to the fact that the equipment has to be thrown away. The most common mistake is using “universal” dispensers or filling “all the way” until liquid comes out of the return tube.
Another mistake is ignoring the type of oil. Miscellaneous. freons require different oils (mineral, alkylbenzene, polyester). If you mix them or use the wrong one, a sediment will form that clogs the capillary tube. Cleaning such a system is often impossible.
Also, beginners often forget about filter driers when opening the circuit (even to replace the compressor). data-i="112">needs to be replaced with a new one. The old adsorbent is already saturated with moisture and, when reused, will release it back into the system, causing an ice jam. required needs to be replaced with a new one. The old adsorbent is already saturated with moisture and, when reused, will release it back into the system, causing an ice jam.
Is it possible to fill a refrigerator with freon from a lighter can?
Absolutely not. The lighter gas contains impurities, propane and butane in other proportions, as well as fragrances. This will lead to decomposition of the oil, corrosion of aluminum inside the evaporator and explosion of the compressor due to ignition of the mixture.
How much does professional freon refilling cost?
The price depends on the region, model of the refrigerator and the cost of the gas itself. On average, the service for finding leaks, soldering and refilling costs from 3,000 to 6,000 rubles. The gas itself makes up only a small part of this amount; the main payment is for work and warranty.
How often do you need to top up freon in a working refrigerator?
In a working, sealed circuit, freon circulates for decades without loss. If your refrigerator requires refueling more often than once every 5-7 years, it means that there is a microcrack in the system or poor-quality soldering that needs to be eliminated.
Is freon R600a dangerous for humans?
In small quantities (up to 60 grams) used in everyday life, it is not toxic. However, it is heavier than air and displaces oxygen, and is also extremely flammable. The danger is posed by a spark from the compressor relay at a time of high gas concentration with a strong leak, so it is important to ventilate the kitchen during repairs.
Why does the refrigerator not freeze for a long time after refueling?
After refueling, the system needs time (from 2 to 6 hours) to reach operating mode. Also, the reason may be air getting into the circuit (poor vacuuming) or the use of low-quality freon with impurities.