Which coolant element is better for a refrigerator: comparison R600a, R134a and R290

The choice of refrigerant for a refrigerator is not just a technical nuance, but an issue that directly affects the operating efficiency, safety and even the cost of servicing the equipment. Many users are faced with a dilemma: which cold element is better - environmentally friendly, time-tested, or promising? The answer depends on the design of the refrigerator, climatic operating conditions and even on whether there are children or pets in the house. isobutane (R600a), time-tested tetrafluoroethane (R134a) or promising propane (R290)? The answer depends on the design of the refrigerator, the climatic operating conditions, and even on whether there are children or pets in the house.

Modern manufacturers — Liebherr, Samsung, Indesit — they are actively switching to natural refrigerants, but old models still run on synthetic freons. Let's figure out what criteria are important when choosing, the dangers of choosing the wrong refrigerant, and how to determine which type is right for your refrigerator.

⚠️ Attention: Replacing the refrigerant in a refrigerator is a procedure that requires certified equipment and knowledge. Incorrect refueling can lead to compressor explosion or gas leak with risk of fire. If you are not a specialist, entrust the work to a specialist with a license to handle freons.

What is a cold element and how does it work in a refrigerator

A cold element (or refrigerant) is a substance that circulates in a closed refrigerator system, transferring heat from the inner chamber to the outside. The process occurs in four stages:

1. Evaporation: The liquid refrigerant enters the evaporator (located inside the refrigerator), where it boils, absorbing heat from the chamber.
2. Compression: The compressor sucks in the gas and compresses it, increasing the temperature and pressure.
3. Condensation: In the condenser (on the back wall of the refrigerator), the hot gas is cooled, releasing heat to the environment, and turns back into liquid.
4. Throttling: The liquid passes through a capillary tube, where its pressure drops, and the cycle repeats.

The effectiveness of this process depends on thermophysical properties of the refrigerant: boiling point, heat capacity, viscosity and compatibility with system materials (copper, aluminum, plastic). For example, R600a boils at −11.7°C, and R134a - at −26.3°C, which affects the cooling rate and load on the compressor.

⚠️ Attention: If, after turning on the refrigerator, the compressor runs without stopping for more than 2 hours, and the required temperature is not reached in the chamber - this may indicate wrong type of refrigerant or its leak. In this case, diagnostics with a pressure gauge is required.

Types of refrigerants: synthetic vs natural

All refrigerants are divided into two large groups:

• 🔬 Synthetic (freons): R134a, R404A, R410A. Developed chemically, stable, but harmful to the ozone layer (even if labeled as “ozone-safe”).
• 🌿 Natural: R600a (isobutane), R290 (propane), R717 (ammonia). They are environmentally friendly, but flammable and require special care when refueling.

Until 2010, most refrigerators operated on R12 (prohibited by the Montreal Protocol) and R134a. Today, European and Russian manufacturers are actively switching to R600a - it is cheaper, more efficient and less harmful to the environment. However, it has a disadvantage: high flammability (safety class A3 according to ISO 817).

Natural refrigerants have better thermodynamic properties, but their use is limited due to risks. For example, R290 (propane) is 20% more efficient R134a, but its refilling is allowed only in refrigerators with sealed systems and explosion-proof compressors.

Comparison of popular refrigerants: R600a, R134a, R290

To understand which coolant element is best for your refrigerator, let’s compare the three most common options in the table:

R600a today is the leader in popularity among manufacturers of household refrigerators (ATLANT, Beko, LG). It is cheap, environmentally friendly and requires less quantity for refilling (only 50–100 grams versus 150–200 g for R134a). However, due to its flammability, it cannot be used in industrial systems or refrigerators with an open compressor.

R134a is a reliable, but outdated option. It is not flammable, but its GWP is 476 times higher than that of R600a. In the EU, its use in new household appliances has been prohibited since 2020, but in Russia and the CIS countries it is still found in older models. It is a promising refrigerant for climate control equipment, but is rarely used in household refrigerators due to strict safety requirements. Its advantage is high energy efficiency (10–15% better Samsung And Indesit.

R290 is a promising refrigerant for climate control equipment, but is rarely used in household refrigerators due to strict safety requirements. Its advantage is high energy efficiency (10–15% better R134a), but refilling is more expensive due to the need to vacuum the system.

Why is ammonia (R717) not used in refrigerators?

Ammonia (R717) is one of the most efficient refrigerants with zero GWP, but it is extremely toxic and has a strong odor. It is used only in industrial refrigeration units (for example, in meat processing plants), where the risk of leakage is minimal. Ammonia is prohibited in household appliances due to the danger of poisoning at the slightest depressurization of the system.

Which refrigerant is better for a home refrigerator

The choice of refrigerant depends on several factors:

• 🔧 Compressor type: For linear compressors (Embraco, Secop) suitable R600a, for rotary (Mitsubishi) — R134a or R290.
• 🌡️ Climatic conditions: In hot climates (<30°C) R600a less efficient - better select R290.
• 💰 Maintenance cost: Refilling R134a is more expensive due to the larger volume, and R600a cheaper, but requires special equipment.
• 👨‍👩‍👧 Safety: If there are children in the house, a non-flammable one is preferable R134a, despite its environmental disadvantages.

For most modern household refrigerators (Liebherr CNes 4356, ATLANT XM 4625-101) the optimal choice remains R600a. It provides:

• ⚡ Fast cooling (due to low heat capacity).
• 💧 Minimum consumption (only 50–80 grams per refill).
• 🌱 Low carbon footprint (GWP = 3 versus 1430 y R134a).

However, if your refrigerator was manufactured before 2010, most likely it uses R134a. Replacing it with R600a possible, but will require:

1. Flushing the system from old oil (polyester).
2. Replacing the filter drier.
3. Tightness checks (isobutane penetrates through microcracks).

Is it possible to fill the refrigerator with refrigerant yourself

Theoretically, you can fill the refrigerator with your own hands, but in practice it dangerous and ineffective without professional equipment. Here's why: Dangerous and ineffective data-i="172">💨 Gas leak: Without evacuation of the system, remaining air and moisture lead to corrosion and breakdown of the compressor.

• 🔥 Risk of fire: R600a And R290 form an explosive mixture with air at a concentration of 1.3%.
• 💨 Gas leak: Without vacuuming the system, remaining air and moisture lead to corrosion and compressor failure.
• ⚖️ Inaccurate dosage: An excess or lack of refrigerant by 10% reduces the cooling efficiency by 20-30%.

If you decide to refuel yourself, you you will need:

1. Gauge manifold with valves for low/high pressure.
2. Vacuum pump (to remove moisture and air).
3. Refrigerant cylinder and scales for accurate dosage.
4. Leak detector (electronic or ultrasonic).

⚠️ Attention: When refueling R600a it is strictly forbidden to use oxygen cylinders or compressors for inflating tires as this may lead to an explosion! Isobutane requires special cylinders with a left-hand thread and a safety valve.

How to determine what refrigerant is in your refrigerator

You can find out the type of refrigerant in several ways:

1. On the compressor nameplate: Sticker on the back wall of the refrigerator or directly on the compressor contains markings (for example, "Refrigerant: R600a").
2. In the operating instructions: Section "Technical characteristics" or "Refrigerant".
3. According to the refrigerator model: Most modern models ATLANT, Beko, Nord work on R600a, and old Samsung i Indesit - on R134a.
4. By the color of the oil: If you saw oil during repairs:
   • 🟢 Greenish - polyester (for R134a).
   • 🟡 Yellow or transparent - mineral (for R600a or R290).

If the marking is erased and the instructions are lost, you can focus on year of manufacture:

• 📅 Before 2005: Probably R12 (prohibited) or R134a.
• 📅 2005–2015: R134a or R600a (in models marked "Green" or "Eco").
• 📅 After 2015: R600a (in 90% of cases) or R290 (rarely).

⚠️ Attention: If "HC" is indicated on the compressor (for example, "R600a HC"), this means that the refrigerant is classified as hydrocarbons (flammable gases). Such refrigerators cannot be repaired near an open one. fire (for example, in a kitchen with a gas stove).

What happens if you use the wrong refrigerant

Filling the refrigerator with the wrong refrigerant leads to serious consequences:

• 🔥 Overheating of the compressor: If instead R600a fill in R134a, the pressure in the system will increase and the motor will wear out. The service life will be reduced by 2-3 times.
• ❄️ Evaporator freezing: Incompatible refrigerant can cause ice to form on the pipes, resulting in blocked air ducts.
• 💥 Circuit rupture: When filling R290 into a system designed for R134athe pressure may exceed the strength limit of copper tubes.
• 🚫 Warranty failure: If the refrigerator is under warranty, self-charging with an uncertified refrigerant will void all manufacturer obligations.

Signs that there is something in the refrigerator unsuitable refrigerant:

• The compressor turns on for 1-2 seconds and turns off (overheating protection).
• Appears on the back wall oil-like film (oil decomposition due to incompatibility).
• The temperature in the chamber does not fall below +10°C, despite the continuous operation of the motor.

If you suspect that the refrigerant is selected incorrectly, immediately:

1. Disconnect the refrigerator from network.
2. Ventilate the room (especially if it was used R600a or R290).
3. Contact the service center for full recharge the system.

FAQ: Frequently asked questions about refrigerants for refrigerators

Is it possible to replace R134a with R600a in an old one? refrigerator?

Theoretically yes, but you will need:

• Rinsing the system from polyester oil.
• Replacing the filter drier.
• Checking the tightness (isobutane penetrates through microcracks).

However, not all compressors are designed to work with R600a. For example, models Danfoss series NL are compatible, but Embraco EG are not. Check compatibility in the technical documentation.

What is dangerous about R600a in a refrigerator?

R600a (isobutane) is a flammable gas of class A3 Its dangers:

• 🔥 Explosive when used. concentration in the air from 1.3%.
• 💨 Heavier than air - accumulates at the bottom of the room.
• 🚫 It has no odor (unlike propane), so leaks are difficult to detect without a leak detector.

However, in a sealed system the risk is minimal - the main thing is not to try to repair it. refrigerator independently without evacuation.

How much refrigerant is needed to refill the refrigerator?

The volume depends on the model and type of refrigerant:

• R600a: 50–100 grams (for refrigerators with a volume of 200–350 l).
• R134a: 100–200 grams.
• R290: 80–150 grams.

The exact amount is indicated on the compressor nameplate (for example, "Charge: 80g R600a"). Excess or deficiency impairs the operation of the system by 10%.

How often do you need to add refrigerant to your refrigerator?

In working the refrigerator is refrigerant does not evaporate —the system is sealed only in two cases:

• After repair (replacing the compressor, soldering tubes).
• If there is a leak (detected by oil stains on the tubes or insufficient cooling).

If the refrigerator requires topping up more than once every 5 years, this is sign microcracks in the circuit. Diagnostics is needed.

Is it possible to mix different refrigerants?

Categorically no! Mixing leads to:

• 🔬 Chemical reactions (for example, R134a + R600a form toxic compounds).
• 💥 Unpredictable pressure in the system (risk of pipe rupture).
• 🚫 Loss of warranty and impossibility of further repair.

If you do not know what refrigerant was in the system previously, it is necessary to completely vacuum the circuit before filling a new one.