The question of what exactly needs to be poured into the refrigeration unit often arises among equipment owners who are faced with loss of cold or strange compressor sounds. Many users mistakenly believe that any liquid or gas can be added inside the system to make the device work again. In fact, refrigeration circuit is a sealed closed system that requires strict adherence to technological regulations during maintenance.
The wrong choice of substance for refilling can lead not only to a lack of cooling, but also to explosive situation or complete failure building an expensive compressor. Modern models use different types of coolants and lubricants that are not interchangeable. Understanding the chemical composition and physical properties of these substances is critical for safe operation.
In this article we will analyze in detail which liquids and gases are used in different components of the refrigerator, how they differ and why experiments with “suitable” analogues are strictly prohibited. You will learn about the differences between freon and oil, as well as what kind of water can be used in No Frost systems.
Types of refrigerants: what circulates in the system
The main working fluid that provides cooling is refrigerant (often called freon). This substance circulates through the tubes, changing its state of aggregation from gas to liquid and back. There are two main types of gases most often found in household refrigerators, and they should not be confused.
The first type is R600a (isobutane). It is a natural hydrocarbon gas that has excellent refrigeration properties, but is flammable. It is used in the vast majority of modern models of European and Asian brands. The second type is R134a, which does not burn, but requires higher pressure in the system and special synthetic oils.
⚠️ Attention: Never try to determine the type of refrigerant only by the smell or color of the cylinder. Isobutane R600a has no odor, and its leakage in a confined kitchen space can create an explosive concentration upon contact with a spark.
The choice of the correct refrigerant depends on the design of the compressor and the type of oil poured into it by the manufacturer. If a system designed for R600auses a different gas, the compressor can burn out in a matter of minutes due to overheating or insufficient lubrication.
Compressor oils: lubricant for the heart of the unit
Inside the compressor there is oil that provides lubrication of rubbing parts and heat removal. The question of what to put into the refrigerator compressor arises when replacing or repairing it. There is a fundamental difference between oils for different types of refrigerants, and mixing them is unacceptable.
For older systems and systems on R134a synthetic ones are used polyester oils (POE). They are highly hygroscopic, that is, they actively absorb moisture from the air. If such oil remains open for several hours, its properties will be irretrievably lost, and it will turn into an acid that corrodes the motor windings.
For modern isobutane systems R600a are more often used mineral oils. They are less sensitive to moisture, but are absolutely not compatible with synthetic analogues. Mixing mineral and synthetic oil leads to the formation of a dense sediment, which clogs the capillary tube and disables the refrigerator.
- 🛢️ Mineral oil: used with hydrocarbon-based refrigerants, is not afraid of short-term contact with air.
- 💧 Synthetic oil (POE): necessary for R134a type freons, requires instant sealing of the system after opening.
- 🚫 Universal oils: practically do not exist for household refrigerators, the use of “similar” oil leads to repairs.
⚠️ Attention: When replacing a compressor, never leave the new unit open for more than 15 minutes. Moisture may get inside, which during operation will cause hydraulic shock or a chemical reaction with the oil.
Is it possible to flush the system when changing the type of oil?
Yes, flushing with nitrogen or a special solvent is required if you change the type of compressor (for example, from R134a to R600a). Remains of old oil in the condenser or evaporator can mix with the new one and cause blockage.
Water for No Frost systems and steam generators
Owners of modern refrigerators with function No Frost or built-in water dispensers often wonder: what kind of water should be poured into special tanks? The answer here is clear - only purified water, but the degree of purification depends on the type of system.
For automatic defrosting systems, where water is used to flush condensate or operate the ice maker, distilled or water after reverse osmosis is ideal. Using tap water will quickly cause scale to form on the heating elements and in thin supply tubes.
Scale is an excellent heat insulator. If it covers the defrost heating element, the refrigerator will stop defrosting, the evaporator will become overgrown with ice, and the fan may become jammed with ice. In models with a dispenser, tap water will also spoil the taste of ice and clog the carbon filter in a matter of weeks.
| Type of water | Risk for equipment | Recommended use |
|---|---|---|
| Tap | High (scale, bacteria) | Not recommended |
| Filtered (jug) | Medium (salt residues) | Only for drinking tanks |
| Reverse osmosis | Low | Ice makers, dispensers |
| Distilled | Minimum | Ideal for everyone systems |
Special liquids for care and cleaning
Sometimes when asked “what to fill in”, users mean means for washing internal cameras It is important to understand here that aggressive chemicals can damage plastic surfaces and rubber seals. Abrasives and chlorine-containing solutions are strictly prohibited.
For regular cleaning, it is best to use a weak solution of baking soda or specialized sprays for household appliances. They leave no odor and are safe for contact with food. If you use folk remedies, make sure that they are completely washed off.
Drainage holes require special attention. If the water in the refrigerator does not leave, there is no need to “push” it with chemicals. It is necessary to use a soft wire or a special brush, and then rinse the canal with warm water using medicinal bulb or a syringe without a needle.
- 🧼 Soda solution: 1 tablespoon per liter of water, disinfects and removes odors.
- 🍋 Citric acid: helps remove light dirt and scale, but requires careful rinsing.
- 🚿 Special sprays: contains antibacterial components that are safe for plastic.
⚠️ Attention: Never use acetone, gasoline or solvents to clean plastic. These substances cause microcracks in polymer materials, making them brittle and brittle.
The process of filling and evacuating the system
If we are talking about a full repair with replacement of the refrigerant, then the process requires a professional equipment. Simply “filling” gas from a cylinder is not enough. The system must be completely dry and evacuated. The presence of air or moisture in the circuit will lead to increased pressure and equipment failure.
First, the technician connects the vacuum pump to the service connection. Evacuation removes air and evaporates moisture contained in the tubes. This stage can last from 15 to 40 minutes depending on the pump power and the length of the circuit. Only after reaching a deep vacuum does the valve of the freon cylinder open.
☑️ Stages of refilling the refrigerator
The amount of refrigerant is measured to the nearest gram. Overfilling is just as dangerous as underfilling. Excess gas will cause liquid freon to enter the compressor, causing water hammer. A lack of gas will force the compressor to work without stopping, trying to gain temperature, which will lead to its burnout.
Frequent errors and myths during maintenance
On the Internet you can find a lot of advice that is more likely to harm than help. One popular myth is that you can add a little oil to the system for “better performance.” This is a gross mistake: the amount of oil in the system is strictly calculated, and its excess settles in the heat exchangers, drastically reducing the cooling efficiency.
Another myth concerns the use of freon “substitutes”. Some craftsmen suggest using lighter gases or other hydrocarbon mixtures. This cannot be done, since they have different boiling temperatures and condensation pressures. Refrigerator simply cannot reach the desired mode.
It is also a mistaken opinion that if the refrigerator has stopped freezing, then you just need to “blow” freon. In 90% of cases, leakage occurs due to corrosion or mechanical damage. If you do not find and seal the leak, new gas will come out in a few days or weeks, and the problem will repeat.
Is it possible to mix different brands of compressor oils?
Absolutely not. Even if both oils are mineral, different manufacturers may have different additives added. Mixing them can lead to sedimentation and coking of the system.
How much does it cost to fill a refrigerator with freon?
The cost depends on the type of refrigerant and the complexity of the work. Refilling R600a is usually cheaper than R134a due to the smaller amount of gas required, but requires more caution due to flammability.
Why does the refrigerator freeze worse after refilling?
Possible reasons: there is air left in the system (poor evacuation), incorrect dosage of refrigerant, or a clogged capillary. Diagnostics by a specialist is required.
Is it dangerous to breathe freon vapors?
In low concentrations, household freons are relatively safe, but they displace oxygen. In large quantities may cause suffocation. R600a is also explosive at a concentration above 1.3% in air.