How often do you need to refill a refrigerator: myths and reality

Many owners of household appliances mistakenly believe that a refrigerator, like a car, requires regular scheduled refueling refrigerant. This misconception is often conveyed by unscrupulous craftsmen who want to make money on an unnecessary service. In fact, a working unit is a sealed system, from which the substance should not escape for years.

If you are wondering how often you need to refill the refrigerator, the correct answer is “never,” unless an accident occurs. Unlike air conditioners, where the connections can be detachable, the cooling circuit of a household refrigerator is completely sealed at the factory. Any intervention in this process for no apparent reason will not only not extend the life of the equipment, but may also upset the balance refrigerantwhich will lead to compressor failure.

In this article we will look in detail at why leaks occur and how to diagnose them and what to do if the equipment stops freezing. Understanding the principles of operation of the refrigeration circuit will save you from unnecessary expenses and help distinguish a real problem from a fictitious one.

The principle of operation of a closed circuit

The basis of any refrigerator is a closed system of tubes through which circulates Freon. This gas under pressure changes from liquid to gaseous and back, taking heat from the chambers and releasing it to the environment through a condenser. The key word here is “closed”. Under ideal conditions, molecules refrigerant do not leave the tubes for decades.

The pressure in the system can reach several atmospheres, which eliminates the suction of air from the outside in case of microscopic damage. However, if there is a hole somewhere, gas will escape. This process is usually invisible to the eye, since freon is colorless and odorless (although some modern models have added odorants for safety). That is why the question “how often to refuel” is incorrect - refueling is required only when mechanical damage is eliminated.

⚠️ Attention: An attempt to refuel a working refrigerator “for prevention” will lead to a violation of the calculated pressure. Excess freon can cause water hammer in the compressor, which will disable the expensive unit instantly.

Modern models, be it Indesit, LG or Bosch, are designed for the entire service life without circuit maintenance. If the technician offers you to fill up with gas “just in case” or “to make it freeze better,” this is a sure sign of a low qualification of the specialist. Refrigerant It is not consumed during operation, it only transfers energy.

Signs of a refrigerant leak

You can understand that a gap has formed in the system by indirect signs that appear long before the equipment stops completely. The first alarm bell is a change in operating mode. The compressor begins to hum almost without interruption, trying to compensate for the lack of of refrigerant and reach the set temperature.

The second sign is insufficient cooling of the products. You may notice that the temperature in the main chamber is higher than normal, and that the ice in the freezer is melting or the meat is softening. At the same time, the compressor itself wears out. This happens because the gas remaining in the system is not enough for effective heat exchange.

• 🌡️ The compressor operates continuously, without going to rest, but it is warm inside.
• 🧊 A “snow coat” forms in the freezer only at the entrance or, conversely, there is complete absence of frost on the evaporator.
• 🔊 The appearance of gurgling or hissing sounds inside the housing, which indicates the mixing of gas and oil in the tubes.
• 💧 The appearance of puddles of water under the refrigerator or inside the chambers due to a violation of the defrost cycle.

It is important not to confuse a freon leak with thermostat malfunction or clogged capillary. In the latter case, the compressor can also work for a long time, but the nature of the sounds and the temperature of different parts of the circuit will differ. Only a specialist can carry out an accurate diagnosis using a pressure gauge station.

Reasons for depressurization of the system

If the instructions do not say to change the gas, why do leaks still occur? Most often, physics and mechanical action are to blame. Thin-walled evaporator tubes, especially in older models, are susceptible to corrosion. Moisture that gets on the metal along with aggressive cleaning agents gradually corrodes aluminium.

The second common cause is mechanical damage. Many users, wanting to get rid of ice, use a knife or other sharp objects. One careless movement and the ice crust is broken, and with it the evaporator tube evaporator. At this moment, a characteristic hissing sound is heard, and the gas begins to rapidly escape.

It is also worth mentioning the manufacturing defect. Sometimes the factory seals copper pipe connections poorly. In this case, a leak may appear in the first year of operation. Fortunately, such cases are covered guarantee, and refilling is done free of charge at an authorized center.

Typical algorithm of the wizard’s actions:
1. Diagnostics and search for leaks.
2. Repairing damage (soldering).
3. Nitrogen pressure testing.
4. Vacuuming (minimum 20 minutes).
5. Refueling by scales.
6. Checking the tightness of solder joints.