Modern refrigerator is a complex thermodynamic system within which various substances circulate to ensure cooling of products. Many owners of household appliances do not even think that behind metal walls hides a whole world of chemical compounds and physical processes. Understanding what kind of liquids located inside helps not only in proper operation, but also in timely diagnosis of faults.
Depending on the type of device and the principle of its operation, the composition of internal liquids can differ radically. This can be an inert gas that has passed into the liquid phase under pressure, or ordinary water formed as a result of condensation of moisture from the air. It is important to distinguish between the working fluids of the cooling system and the by-products of operation.
In this article we will analyze in detail what agents fill the circuits of your unit, why special oils are added there, and why sometimes a puddle may appear under the device. Knowing these nuances will allow you to avoid panic at the sight of a strange substance and properly maintain the equipment.
Refrigerants: the heart of the cooling system
The main working fluid in any refrigerator is refrigerant (or freon). This substance has the unique ability to boil at very low temperatures, absorbing heat from the chamber, and condense at higher temperatures, releasing it into the environment. Circulating in a closed circuit, the refrigerant constantly changes its state of aggregation from gas to liquid and back.
In modern household models, environmentally friendly ones are most often used freons, such as R600a (isobutane) or R134a. Previously used R12 and R22 were banned due to their negative impact on the ozone layer. The amount of refrigerant is strictly regulated by the manufacturer and usually ranges from 30 to 150 grams depending on the volume of the chamber.
Is it dangerous to inhale freon vapors?
Inhaling freon vapors in high concentrations can cause suffocation, since the gas displaces oxygen. In addition, some types of refrigerants decompose into toxic substances when exposed to open flames. If you smell gas or see a leak, immediately ventilate the room and call a technician.
It is worth noting that in a working refrigerator, the refrigerant does not require replacement or topping up during its entire service life. If the system is sealed, cycle cooling is repeated endlessly. Problems arise only when there is mechanical damage to the tubes or manufacturing defects in the welds.
Compressor oil: lubrication and protection
Inside the compressor, which is often called the “motor” of the refrigerator, there is a special compressor oil. It is necessary to lubricate the rubbing parts of the piston group, reduce friction and remove heat generated during gas compression. Without this fluid, the mechanism would quickly fail due to overheating and wear.
The peculiarity of modern oils is that they must be completely soluble in the refrigerant used. This allows the oil to circulate freely with the gas throughout the system, returning back to the compressor. Depending on the type of freon, different types of oils are used: mineral for older models or synthetic (polyester POE, polyvinylethylene glycol PVE) for new environmentally friendly agents.
- 🛢️ Mineral oils - used with freons R12 and R22, have good lubricity, but hygroscopic.
- 🧪 Synthetic oils (POE/PVE) - required for R134a and R600a, chemically stable, but actively absorb moisture from the air.
- 🌡️ Heat resistance - the oil must withstand high temperatures in the compressor discharge zone without loss properties.
It is important to understand that if you see an oily stain under the refrigerator or on the pipes near the compressor, this is an alarming signal. This means that the refrigerant has leaked along with the oil. It is impossible to operate such a unit, since without lubrication the compressor will jam, and the lack of freon will lead to spoilage of products.
⚠️ Attention: An attempt to independently change the oil in the compressor without evacuation of the system and the use of specialized equipment will lead to rapid failure of the refrigerator. Synthetic oils instantly absorb moisture from the air, forming acid, which destroys the engine windings.
Water: condensate and No Frost system
The most common liquid that the user encounters is ordinary water. It appears as a result of condensation of moisture contained in the air inside the chambers on cold evaporators. In models with a drip defrosting system (Drop System), this process occurs directly on the rear wall of the refrigerator compartment.
When the compressor turns off, the wall heats up and the accumulated ice melts, flowing down the groove into the drainage hole. Next, the water flows through the tube into a special container (bath) located above the compressor. There it safely evaporates under the influence of the heat of a running engine, without requiring human intervention.
In systems No Frost moisture settles on a hidden evaporator located behind the back panel of the freezer or refrigerator compartment. The heating element is turned on periodically, which melts the ice. The resulting water also flows into the drain and evaporates. If you find water on the floor under the refrigerator, most often this means that the drainage hole is clogged or the drain tube is damaged.
☑️ Diagnosis of water leaks
Table: Comparison of liquids in the refrigerator
For a better understanding of the differences between the main liquids used in the design of refrigeration equipment, we present a comparative table. It will help systematize knowledge about the functions and properties of each component.
| Fluid type | Location | Main function | Does it require replacement |
|---|---|---|---|
| Refrigerant (Freon) | Sealed circuit (pipes, evaporator, condenser) | Heat transfer from the chamber to the outside | No (only during repairs) |
| Compressor oil | Compressor crankcase and circulation circuit | Lubrication and cooling of mechanisms | No (sealed system) |
| Condensate (Water) | Drainage system, tray above motor | Product of moisture condensation from the air | Evaporates on its own |
| Glycerin (rarely) | Seal area (in some models) | Preservation of elasticity rubber | As needed |
The table shows that in normal operation the user should not interact directly with any of these liquids. The system is designed to be as autonomous as possible. However, knowledge location of the components helps to quickly find the cause of the malfunction.
Special fluids for care and maintenance
Although only the above-mentioned substances circulate inside the refrigerator, external ones may be required for its maintenance. liquids. First of all, we are talking about means for washing internal chambers and seals. Manufacturers recommend using warm water with the addition of a mild detergent or special sprays for household appliances.
Sealing rubber bands deserve special attention. Over time, they can dry out and crack. To extend their service life, silicone grease or glycerin is sometimes used. This helps maintain the elasticity of the material and ensure a tight fit of the door to the body, which is critical for energy efficiency.
- 💧 Soap solution - for regular cleaning of shelves and walls (removes odors and bacteria).
- 🍋 Citric acid solution - helps remove scale and disinfect surfaces.
- 🧴 Silicone grease - for caring for the rubber contour of the door (applied in a thin layer).
⚠️ Attention: It is strictly forbidden to use abrasive cleaners, acetone, gasoline or aggressive solvents to wash the internal chambers. They can damage the plastic case, cause cracks and make the plastic brittle.
What to do if found leak?
If you notice that the refrigerator has stopped freezing, and traces of oil are visible on the floor or pipes, most likely the circuit has depressurized. In this case refrigerant evaporated, carrying with it some of the compressor oil. It is impossible to eliminate such a malfunction on your own, since it requires soldering the tubes, evacuating the system and filling with new gas.
Attempts to simply “top up” freon without finding and eliminating the leak will only give a temporary effect. In a few days or weeks the problem will recur. In addition, mixing different types of oils or freons can lead to the formation of an acidic deposit, which over time will completely damage the compressor.
When calling a technician, be sure to check the model of the refrigerator and the type of refrigerant used (this information is on the sticker inside the chamber or on the back wall). This will allow the specialist to take with him the necessary consumables and tools.
Is it possible to drive a refrigerator with a broken seal?
It is possible to transport a refrigerator with a broken circuit, but it is highly undesirable. Air and moisture will get inside the system through the hole, which will require a more complex and expensive restoration procedure (replacing the filter-drier, long-term evacuation).
FAQ: Frequently asked questions
Why did a puddle appear under the refrigerator?
Most often this is melt water due to a clogged drain holes. Check to see if the water drainage channels are clogged with crumbs. Also, the cause may be a displacement of the drain tube or a crack in the receiving tray above the compressor.
Is freon dangerous for humans?
Modern freons (R600a, R134a) are not toxic in small quantities, but R600a (isobutane) is an explosive gas. Inhalation of large concentrations may cause suffocation. In case of a severe leak, it is necessary to ventilate the room and not turn on electrical appliances.
Does it need to change the oil in the refrigerator?
No, in a working refrigerator the oil circulates in a closed circuit along with freon and does not require replacement. It is changed only in case of serious repair of the compressor or the entire system.
What is the best way to wash the inside of the refrigerator?
It is best to use warm water with the addition of a small amount of dishwashing detergent or specialized sprays for refrigerators. Avoid strong chemicals and abrasives.