Refrigerant in refrigerators: what is there, how the types differ and which is better

The refrigerator is an indispensable assistant in the kitchen, but few people think about what exactly makes it cold. The main role in this process is played refrigerant by a special substance that circulates through the system and removes heat from the chamber. Not only the energy efficiency and power of the device depend on the type of refrigerant, but also its environmental friendliness, noise level, and sometimes even safety for health.

Today, manufacturers use several types of refrigerants, each of which has its own characteristics. Some of them are time-tested, but outdated from an environmental point of view, others are modern and safe, but require a special approach to maintenance. Understanding this diversity is important not only for specialists, but also for ordinary users: the choice of refrigerant can determine how durable and economical your refrigerator will be.

In this article we will take a detailed look at what refrigerants there are, how they differ, what are the pros and cons of each, and also answer frequently asked questions: is it possible to replace one refrigerant with another, how to understand what type is used in your model, and what to do if a leak has occurred.

What is refrigerant and how does it work in a refrigerator

Refrigerant (or freon) is the working substance of the refrigeration circuit, which circulates through a closed system, absorbing heat inside the chamber and releasing it outside. The cooling process occurs due to the physical properties of the refrigerant: when it evaporates, it takes up heat, and when it condenses, it releases it.

In a classic compressor refrigerator, the refrigerant goes through four main stages:

1. Evaporation — in the evaporator (located inside the chamber) liquid refrigerant turns into a gaseous state, absorbing heat.
2. Compression —the compressor “sucks in” the gas and compresses it, increasing the temperature and pressure.
3. Condensation —in the condenser (usually on the back wall of the refrigerator), the hot gas is cooled and becomes liquid, releasing heat to the environment.
4. Expansion —through the capillary tube, the liquid returns to the evaporator, and the cycle repeats.

The cooling efficiency depends on the type of refrigerant, its thermophysical properties and design systems. For example, some substances are better suited for low-temperature freezers, while others are better suited for regular refrigeration sections.

Main types of refrigerants in refrigerators: comparison and characteristics

Over the past decades, several generations of refrigerants have been used in refrigeration technology. They can be divided into three groups:

• 🔴 Outdated (banned or withdrawn from circulation) — R12, R22, R134a (partially). They have a high ozone depletion potential (ODP) or global warming potential (GWP).
• 🟡 Transient (limited use) — R134a, R404A. Less harmful, but still not ideal from an environmental point of view.
• 🟢 Modern (eco-friendly) — R600a (isobutane), R290 (propane), R32. They have minimal impact on the environment.

Below is a table with the key characteristics of the most common refrigerants in household refrigerators:

*ODP (Ozone Depletion Potential) - the potential for destruction of the ozone layer.

**GWP (Global Warming Potential) - global warming potential (relative to CO₂).

Important: since 2020, the EU and many other countries have banned the production of refrigerators with refrigerants with a GWP above 150. This means that models on R134a and R404A are gradually leaving the market.

R600a (isobutane): the most popular refrigerant in modern refrigerators

R600a is a natural hydrocarbon refrigerant that is used today in 90% of household refrigerators leading brands: Liebherr, Bosch, Samsung, LG, ATLANT etc. Its main advantages:

• 🌱 Environmental friendliness — ODP=0, GWP=3 (one of the lowest values among all refrigerants).
• ⚡ Energy efficiency —refrigerators with R600a consume 10–15% less electricity compared to models with R134a.
• 🔇 Low noise level —due to lower pressure in the system, the compressor works quieter.
• 💰 Low cost of refilling - cheaper than synthetic analogues.

However, isobutane also has disadvantages:

• 🔥 Fire hazard - belongs to flammability class A3 (highly flammable gas). In the event of a leak, it can form an explosive mixture with air (at a concentration of 1.3–8.5%).
• 🛠️ Difficulty of repair —requires special equipment and skilled technicians (not all service centers work with hydrocarbons).
• 🚫 Incompatibility with some materials —can corrode rubber seals and hoses not intended for hydrocarbons.

Despite the flammability, R600a is considered safe with proper use: in household refrigerators its amount does not exceed 100–150 grams, and the system is sealed. The risk of a leak is minimal, but if it does occur, the room must be ventilated (the gas is heavier than air and accumulates below).

R134a: outdated, but still found refrigerant

R134a is a synthetic refrigerant that was actively used in refrigerators in the 1990–2010s. It replaced the banned R12 (freon), but today it is also considered obsolete due to its high GWP (1430). However, it can still be found in:

• 🏠 Old household refrigerators (for example, models Indesit, Ariston, Birusa before 2015).
• 🚗 Car air conditioners (although there it is also being actively replaced with R1234yf).
• ❄️ Some industrial freezers.

Advantages R134a:

• 🔧 Easy to maintain —non-flammable, non-toxic, easy to refill.
• 🔄 Compatibility —suitable for most older systems without modifications.
• 🌡️ Stable operation in a wide temperature range.

Disadvantages:

• 🌍 Harm to the environment —prohibited for use in new models in the EU and many other countries.
• 💡 Less energy efficiency compared to R600a or R290.
• 💰 Expensiveness —despite obsolescence, the price R134a remains high due to production limitations.

⚠️ Attention: If your refrigerator uses R134a, if there is a leak, it can be refilled, but completely replaced with a modern one refrigerant (for example R600a) will require modifications to the system (changing the oil, seals, and sometimes the compressor). This is economically feasible only for expensive or industrial models.

Is it possible to refill an R134a refrigerator yourself?

Refilling the refrigerant yourself is strictly not recommended! This requires:

1) A vacuum pump to remove moisture from the system.

2) A pressure manifold for pressure control.

3) Accurate scales for dosing the refrigerant (excess or undercharging will lead to compressor failure).

4) Knowledge of the refrigeration circuit diagram of a specific model.

Errors during refueling can lead to compressor failure or even an explosion (when mixing refrigerants).

R290 (propane) and R32: alternatives for energy-efficient models

R290 (propane) and R32 are two refrigerants that are increasingly found in modern refrigerators, especially in premium and energy-saving models. They are characterized by high efficiency and minimal impact on the environment.

R290 (propane)

Propane is another natural hydrocarbon, similar in properties to R600a, but with a lower boiling point (-42.1°C against -11.7°C isobutane). This makes it ideal for:

• 🧊 Freezers with temperatures up to -24°C and below.
• 🏭 Industrial refrigeration systems (for example, in supermarkets).
• ⚡ Inverter compressors (due to high thermal conductivity).

Compared with R600a, propane has 20% greater cooling capacity, but is also flammable (class A3). It is used less frequently in household refrigerators due to more stringent safety requirements.

R32

R32 is a relatively new refrigerant that is actively replacing R410A in air conditioners and is beginning to be used in refrigerators with inverter compressors. Its features:

• ⚡ High energy efficiency — 5–10% better than that R410A.
• 🌍 Low GWP (675 versus 2088 y R410A).
• 🔥 Moderate flammability (class A2L - low flammable).

Disadvantage R32 is higher operating pressure, which requires reinforced materials for pipes and the compressor. It is still rare in refrigerators, but its popularity is growing due to its environmental friendliness and compatibility with inverter technologies.

⚠️ Attention: Refrigerants R290 and R32 cannot be mixed with other types (for example, with R134a or R600a) This can lead to a chemical reaction, system damage, or even an explosion. When refilling, be sure to use only that one. refrigerant, which is indicated on the nameplate of the refrigerator.

How to find out what refrigerant is in your refrigerator

You can determine the type of refrigerant in several ways:

1. A sticker on the compressor or rear wall.
   

   Look for inscriptions like:

   • 🔹 Refrigerant: R600a or HC-600a.
   • 🔹 Flammable gas or Iso-Butane (indicates R600a).
   • 🔹 R134a or HFC-134a.
2. Passport or instructions for refrigerator.
   

   In the "Technical Specifications" section, the type of refrigerant is usually indicated. If the documentation is lost, find the model of the refrigerator on the manufacturer's website.

3. Marking on the circuit tubes.
   

   Sometimes a colored mark is applied to the copper tubes near the compressor:

   • 🔴 Red - R134a.
   • 🟢 Green - R600a.
   • 🔵 Blue - R290 or R32.

Year of manufacture of the refrigerator.

If your refrigerator released:

• 📅 Before 2000 — most likely R12 (banned) or R22.
• 📅 2000–2015 — R134a.
• 📅 After 2015 — R600a (90% of cases) or R290.

If you were unable to determine the refrigerant yourself, contact the service center indicating the model of the refrigerator. Never try to open the system or drain the refrigerant without special skills!

Disconnect the refrigerator from the network 2-3 hours before arrival of a specialist|Get access to the back wall (move away from the wall)|Prepare a passport or photo of the nameplate with model data|Ventilate the room if you suspect a refrigerant leak|Make sure that there are no easily perishable foods in the refrigerator-->

Is it possible to replace the refrigerant in the refrigerator with a different type

Theoretically, it is possible to replace the refrigerant, but in practice it difficult, expensive and not always practicalHere are the key points:

When replacement is possible

• ✅ If there is a leak - if the original refrigerant is prohibited (for example, R12), it is replaced with a modern analog (for example, R134a or R600a).
• ✅ During modernization - some old refrigerators can be adapted to R600aif you replace the oil in the compressor and seals.
• ✅ When repairing the compressor - if the old compressor is out of order, the new one can be designed for a different refrigerant.

When replacement is impossible or unprofitable

• ❌ In refrigerators with a capillary tube —its diameter is designed for a specific refrigerant, and replacement will require a complete rework of the system.
• ❌ In models older than 10–15 years —the cost of replacement may exceed the price of a new refrigerator.
• ❌ When switching from synthetic to hydrocarbon refrigerant (for example, from R134a to R600a) - it is necessary to replace all rubber parts with ones compatible with hydrocarbons.

Replacement cost refrigerant in the service center ranges from 3,000 to 10,000 rubles (depending on the complexity of the work). This amount includes:

• 🔧 System diagnostics.
• 🧪 Evacuation of the circuit.
• 💧 Refilling with new one. refrigerant.
• 🔍 Checking the tightness.

⚠️ Attention: If the technician suggests replacing R134a with R600a without modifying the system, this can lead to compressor failure. Hydrocarbon refrigerants require special oil! (for example, POE instead of PAG), otherwise the compressor will quickly fail.

What to do in case of a refrigerant leak: signs and actions

Refrigerant leak - one of the most common malfunctions of refrigerators. Its symptoms:

• ❄️ The refrigerator does not cool or cools poorly, despite the compressor running.
• 🔊 The compressor works non-stop or turns on too often.
• 🌡️ On the back wall of the refrigerator no heating (cold condenser).
• 💨 In the freezer frost appears only in one corner (place of leak).
• 👃 Smell of gas (for R600a or R290 - faint odor of propane; R134a has no odor).

If you suspect a leak:

1. 🔌 Disconnect the refrigerator from network and ventilate the room (especially if a hydrocarbon refrigerant is used).
2. 📞 Call a technician —self-repair is dangerous!
3. 🚫 Do not turn on the refrigerator before eliminating the leak - this can lead to compressor breakdown.

Reasons leaks:

• 🛠️ Mechanical damage pipes (for example, when moving the refrigerator).
• 🕳️ Corrosion copper tubes (especially in older models).
• 🔧 Poor quality repairs (poor soldering, cracks at the joints).
• 🧊 Factory defects (rare, but found in budget models).

The cost of repairs for a leak depends on its location:

• 🔹 Leakage in evaporator —the most expensive repair (requires replacement of the evaporator, from 8,000 rubles).
• 🔹 Leakage in capacitor —average cost (3,000–6,000 rubles).
• 🔹 Leakage in pipes or connections —the cheapest repair (1,500–3,000 rubles).

⚠️ Attention: If the leak occurred in the refrigerator with R600a or R290, do not turn on lights or electrical appliances in the room until it is ventilated! These gases are heavier than air and can accumulate near the floor, creating a fire hazard.

FAQ: Frequently asked questions about refrigerants in refrigerators

❓ Is it possible to refill the refrigerant in the refrigerator yourself?

No, it is dangerous and technically difficult. For refilling you need:

• A vacuum pump to remove moisture.
• A pressure manifold.
• Accurate scales (for refrigerant dosage accurate to the gram).
• Knowledge of the circuit diagram and type of oil in compressor.

Errors during charging can lead to compressor failure, leakage or even an explosion (when mixing incompatible refrigerants).

❓ Which refrigerant is the safest for health?

All modern refrigerants (R600a, R290, R32) are non-toxic, but differ in flammability:

• R600a and R290 —flammable (class A3), but in household refrigerators their quantity is minimal (50–150 g), so the risk of fire is extremely low.
• R32 —low-flammable (class A2L), more safer than hydrocarbons.
• R134a - non-flammable, but harmful to the environment.

From a health point of view, they are all safe when used correctly. The main thing is to ventilate the room in the event of a leak.

❓ Why do modern refrigerators use flammable refrigerants?

Because they are more environmentally friendly and energy efficient. Hydrocarbons (R600a, R290) have:

• Zero ODP (do not destroy the ozone layer).
• Minimum GWP (hundreds of times less than synthetic refrigerants).
• High thermal conductivity, which reduces the load on compressor and saves energy.

Flammability is compensated by the small amount of refrigerant in the system and reliable sealing.

❓ Is it possible to use a refrigerator with a refrigerant leak?

No, this will lead to:

• Overheating and failure of the compressor (repairs will cost 50–70% of the cost of a new refrigerator).
• Increased energy consumption (the compressor will work non-stop).
• Product spoilage due to lack of cooling.

If you suspect If the refrigerator leaks, you need to turn it off immediately and call a technician.

❓ Which refrigerant is better: R600a or R134a?

R600a wins in all respects:

• 🌍 More environmentally friendly (GWP=3 vs 1430 y R134a).
• ⚡ More energy efficient (lower electricity consumption).
• 🔇 Quieter (less load on the compressor).
• 💰 Cheaper to refill.

The only negative is flammability, but with proper use this is not problem. R134a today is considered obsolete and is used only in older models.