The question of what the gas for refrigerators is called arises among owners of household appliances not just out of idle curiosity. Most often, this indicates that the unit has stopped freezing, oily spots have appeared on the back wall, or the compressor is running, but there is no cold. Understanding exactly what substance circulates in the system is the key to correct diagnosis and safe repair.
In everyday life, this substance is often called simply “gas” or “freon”, but the technically correct name is refrigerant. It is this working fluid, changing its state of aggregation from liquid to gaseous and back, that transfers heat from the chambers to the outside. Modern models can use different types of substances, and mixing them up when refilling means ruining the compressor or creating an explosive situation.
In this article we will analyze in detail which refrigerants are used in household appliances, how they differ and why you can’t just buy “any gas” for refilling. You will learn how different types of freons are labeled and what to look for when servicing your refrigeration equipment.
What is freon and why did this name become a common noun
Historically, the word freon became synonymous with any refrigerant, although initially it was just a trade name given by the DuPont company to the group chlorofluorocarbons. Today, this term often refers to a whole range of substances used in refrigeration machines. Technically, a refrigerant is a substance that, when boiling and expanding, absorbs a large amount of heat from the environment.
The operating principle of any refrigerator is based on a cyclic change in the pressure and temperature of this gas. The compressor compresses the refrigerant gas, raising its temperature, before it cools into a liquid in the condenser (the black radiator at the back). Passing through the capillary tube and evaporator, the liquid expands sharply, boils and actively “pulls” heat from the food. This process is possible only due to the specific physical properties of the gas used.
Why can’t you use regular gas?
Using the wrong gas (for example, propane in a system designed for freon) will lead to rupture of pipes or explosion of the compressor due to a mismatch in pressure and lubricating properties of the oil.
It is important to understand that different models of refrigerators require a strictly specific type of refrigerant. Marking The substance is always indicated on a technical sticker, usually located on the back wall of the case or inside the chamber. Using the wrong gas will lead to incorrect operation of the system or its complete failure.
Main types of refrigerants: from R12 to modern ones analogues
The evolution of refrigeration gases has followed the path of increasing efficiency and reducing harm to the environment. Old models released before the mid-90s most often worked on R12. It was a reliable gas, but extremely harmful to the ozone layer of the planet. Its production and use in new devices is now prohibited by international agreements.
It was replaced by R134a (tetrafluoroethane). This gas became the standard for most refrigerators manufactured between the late 90s and 2010s. It does not deplete the ozone layer, but has thermal global warming potential. Systems with this refrigerant use synthetic oil, which is very sensitive to moisture, which requires high qualifications during repairs.
Modern refrigerators, especially built-in ones and models of class “A++” and higher, are switching to isobutane, known as R600a. This is a hydrocarbon gas that has excellent cooling performance characteristics and is absolutely safe for the environment. However, it has a serious caveat - it is flammable. That is why when working with such systems, special care is required and the absence of open flame sources.
There are also mixed refrigerants, such as R407C or R507, but they are rare in household appliances, mainly in industrial installations or specific chest freezers. For the home user, it is important to distinguish between three main types: R12 (historic), R134a (mass) and R600a (environmentally friendly).
Table for comparing the characteristics of popular refrigerants
To better understand the difference between types of gases, let's turn to a comparative analysis of their physical and chemical properties. This will help you understand why replacing one type with another is impossible without completely re-soldering the system and changing the oil.
| Parameter | R12 (Freon-12) | R134a (Freon-134) | R600a (Isobutane) |
|---|---|---|---|
| Chemical formula | CF2Cl2 | CH2FCF3 | CH(CH3)3 |
| Effect on ozone | Destroys | Safe | Safe |
| Flammability | Does not burn | Does not burn | Flammable |
| Oil type | Mineral | Synthetic (POE) | Mineral |
| System pressure | Low | High | Low |
As can be seen from the table, the key difference is not only chemical composition, but also the type of oil used. Synthetic oilused with R134a is hygroscopic - it instantly absorbs moisture from the air, which can lead to the formation of acids and capillary blockage. Mineral oils used with R600a are more stable, but require ideal system cleanliness.
The pressure in the circuit also plays a role. R134a systems operate at higher pressures, requiring larger compressors and stronger pipes. Isobutane systems (R600a) operate at lower pressure, which allows for thinner evaporator walls and quieter and more economical compressors. This is why modern refrigerators operate so silently.
How to determine the type of gas in your refrigerator
Before planning repairs or refueling, you need to know exactly what your unit is filled with. Manufacturers are required to provide this information, and there are several ways to find it. The most reliable source is the technical sticker (nameplate). It is usually located on the back metal panel of the refrigerator, less often - inside the main chamber on the side wall or on the door.
On the sticker you are interested in the field Refrigerant or Refrigerant. The designation will be indicated there, for example R600a and the quantity in grams (for example, 52g). If the sticker is worn off or missing, you can refer to the year of manufacture. Models before 1995 are almost always R12. The period from 1996 to 2010 is the zone of dominance of R134a. All modern models, especially those with energy efficiency labeling A+ and above, most often use R600a.
⚠️ Attention: If you are planning self-diagnosis, remember that R600a gas is explosive at a concentration in air of more than 1.3%. If a strong leak is detected in a confined space (for example, in a kitchen niche), you must immediately ventilate the room and do not turn on electrical appliances so that a spark does not provoke an ignition.
Also, the type of gas can be indirectly determined by the noise of the compressor and the structure. Isobutane (R600a) refrigerators often have less refrigerant in the system (only 30-60 grams versus 150-200 grams for R134a), so if they leak, they stop freezing faster. In addition, compressors for R600a are often painted black and have specific markings starting with a letter C or GS.
In some cases, if the sticker is not readable and the year of manufacture is unknown, only a technician can determine the exact type of gas using a manifold and pressure analysis in the system, but even this method does not provide a 100% guarantee without chemical analysis.
Signs of a leak and the need for refueling
A refrigerator is a sealed system, and in good condition, gas should not escape from it for years. If you are wondering what the gas is called and where to get it, it means the seal has been broken. Leakage can occur through microcracks in the evaporator (often hidden behind plastic), through soldered tubes or through corrosion of the metal casing.
The main symptoms of a lack of refrigerant are:
- ❄️ The compressor works continuously without turning off, but the temperature in the chambers does not drop below +10°C.
- 💧 Lack of cold in one of the chambers (for example, the freezer works, but the refrigerator does not, or vice versa).
- 🔥 Strong heating of the compressor (it can be so hot that it hurts to touch it).
- 🧊 Appearance “snow coat” only in one corner of the evaporator or a complete absence of frost on the tubes.
It is important to distinguish gas leaks from other faults, such as thermostat failure or defrosting problems. If the compressor does not turn on at all or turns on for a few seconds and clicks, the problem is most likely in the start relay or the motor itself, and not in the lack of gas.
☑️ Symptoms of a freon leak
If you find an oily stain on the floor under the refrigerator or on the back grill, it’s almost A 100% sign that oil has leaked out along with the gas. In this case, simple refueling will not help: you will need to find the leak, seal it, purging the system with nitrogen and replacing the filter-drier.
Why you can’t refuel the refrigerator yourself
Many owners, having learned the name of the gas for their refrigerator, try to purchase a cylinder and hoses for refueling themselves. This is a dangerous misconception. The refueling process is not just about “pumping up pressure” like a car tire. This is a complex technological process that requires evacuation of the system.
There should be nothing inside the circuit except clean refrigerant and oil. Air and, most importantly, the moisture contained in it are destructive to the system. Moisture reacts with the oil and refrigerant, forming acids that corrode the compressor windings from the inside. To remove moisture, the system must be evacuated with a special pump to a pressure close to absolute zero for 30-60 minutes.
⚠️ Attention: An attempt to refuel “by eye” or using cheap Chinese kits without a vacuum pump will lead to the compressor burning out in 2-3 weeks. Acids formed due to moisture will destroy the motor insulation. Savings on calling a technician will result in the purchase of a new refrigerator.
In addition, different gases require different dosage accuracy. Modern R600a refrigerators require only 30-50 grams of gas. An error of 5-10 grams (which is easy to do without electronic scales) will lead to either underfilling (the refrigerator does not freeze) or overfilling (liquid gas enters the compressor, causing water hammer and its breakdown).
The myth of “eternal refueling”
There is no concept of “preventive refueling”. If the gas is gone, then there is a hole. Simply adding gas is a temporary measure for 2-4 weeks, after which the leak will recur and the compressor will wear out faster.
It is also worth considering the legal aspect. Freons are controlled substances. Their sale to private individuals is limited in many countries, and their release into the atmosphere (which inevitably occurs when refilling is inept) is harmful to the environment and can lead to fines for service centers, although this concerns less private owners.
Environmental standards and the future of refrigeration gases
The refrigerant industry continues to develop. If previously the main criterion was efficiency, now environmental friendliness comes to the fore. R134a gas, which we consider the standard, is being phased out in the European Union and other developed countries due to its high global warming potential (GWP).
The future lies with “natural” refrigerants such as isobutane (R600a) and propane (R290), as well as new synthetic compounds that do not burn and do not affect the climate. Manufacturers are already testing systems using R1234yf, which is used in car air conditioners and is beginning to appear in premium household appliances.
For the consumer, this means that repairing old refrigerators using R12 or R134a will become more expensive over time due to the rise in price and shortage of these gases. When choosing new equipment, you should now pay attention to models running on R600a - they are not only more environmentally friendly, but also more economical in energy consumption.
Technologies are changing, and perhaps in 10 years the question “what is the name of the gas for refrigerators” will have a completely different answer, based on nanotechnology or magnetic cooling, but for now classic freons and hydrocarbons remain without alternative the basis of our household appliances.
Is it possible to fill a refrigerator with car freon?
No, absolutely not. Automotive air conditioners (R134a) and household refrigerators (R134a or R600a) use different types of oil and have different designs. In addition, automobile gases often contain phosphor additives and special oils for air conditioning compressors, which will destroy the refrigerator.
How much does it cost to fill a refrigerator with gas?
The price depends on the type of gas and the complexity of the work. Refilling R600a is usually cheaper since little gas is needed, but handling flammable gas requires more care. The cost consists of the technician’s visit, the cost of gas, evacuation and sealing of the tube. The exact price can be found out only after diagnostics.
Is gas from a refrigerator dangerous for humans?
Modern gases (R134a, R600a) are low-toxic in small quantities. However, at high concentrations, R134a displaces oxygen, causing asphyxiation. R600a is explosive. Old R12, upon contact with an open flame, disintegrates into phosgene, a chemical warfare agent. Therefore, in case of any leak, you need to ventilate the room.
How long does the gas last in the refrigerator?
In a working, sealed refrigerator, gas circulates for decades without loss. If the gas has escaped, it means a microcrack has formed. The service life of gas is not limited, it is not “consumed” and does not “run out” on its own during operation.
Why do new refrigerators contain less gas?
Modern refrigerants, such as R600a, have a much higher cooling capacity per unit mass than older freons. For efficient operation, a modern refrigerator only needs 30-50 grams of gas, while older models required 200-300 grams.