Refrigeration equipment is an integral part of modern kitchens, ensuring food safety. However, when the unit stops freezing, the first thing to suspect is a refrigerant leak. Many equipment owners mistakenly believe that the refrigerant is located in a specific cylinder or removable tank, which can be easily replaced independently.
In reality, freon in the refrigerator circulates through a closed, sealed circuit consisting of thin tubes and assemblies built into the housing structure. Understanding how this system works is necessary for diagnosing malfunctions and understanding the complexity of possible repair work.
In this article we will analyze in detail the path of the refrigerant through the system, indicate the exact locations of the main elements and explain why finding the location of the leak often requires professional intervention.
Principle refrigerant circulation
To understand exactly where to look freon, you need to imagine that it does not stand still, but is in constant motion under pressure. The gaseous substance is compressed by the compressor, heating up, and enters the condenser.
Here the condensation process occurs: the hot gas cools, giving off heat to the environment, and turns into liquid. It is in the liquid state that the refrigerant moves to the evaporator.
Evaporator - this is the very element where freon boils at low pressure. During the boiling process, it actively absorbs heat from the refrigerator chambers, providing the necessary cold.
⚠️ Attention: Freon has neither color nor odor. It is almost impossible to detect its leak visually without special equipment or a soap solution.
After passing through the evaporator, the gaseous refrigerant is again sucked in by the compressor, and the cycle is repeated. This vicious circle ensures a stable temperature inside the chambers.
It is important to note that the system is designed to operate throughout the entire service life of the device without refueling. If the amount of gas decreases, it means that the tightness of the circuit is broken.
Main components of the cooling system
The cooling system consists of several key elements, each of which plays a role critical role in refrigerant circulation. Knowing their location will help you better navigate the structure of your device.
The first and main node is compressor. This is the “heart” of the refrigerator, which creates pressure for the movement of gas. It is usually located in the lower rear part of the device.
The second important element is condenser. In modern models, this is often a grille mounted on the back wall, or pipes built into the side walls of the case. This is where freon gives off heat.
The third element is evaporator. It can be open (in older models with a “crying” wall) or hidden (in the No Frost system behind a plastic panel). Direct cooling of the chambers occurs here.
Connects all these nodes capillary tube. This is a very thin copper conductor that serves as a choke, sharply reducing the freon pressure before entering the evaporator.
| Element | Location | Function | Operating temperature |
|---|---|---|---|
| Compressor | Bottom, rear wall | Pressure buildup | High (up to 80°C) |
| Condenser | Rear grille / sides | Gas cooling and liquefaction | Warm / Hot |
| Evaporator | Inside the chambers / behind panel | Freon boiling and cold | Low (from -20°C) |
| Filter drier | Next to the compressor | Moisture removal | Room / Warm |
All these components are connected to each other by copper or steel tubes, forming a single sealed system. Violation of the integrity of any of the connections leads to the release of gas to the outside.
Hidden locations of the circuit
In modern refrigerators, especially in models with the system No Frost, a significant part of the circuit is hidden from the user's eyes. This is done for aesthetics and compactness, but complicates diagnostics.
The tubes evaporator are often foamed into the walls of the case or located behind the rear plastic panel in the freezer. It is impossible to get to them without disassembling.
In addition, in many models condenser it is also built into the side walls. If you run your hand along the side of a working refrigerator and feel the heat, it means that the condenser is located there.
This design is called a “heat exchanger in the wall.” It is effective, but if corrosion or mechanical damage occurs, it is extremely difficult to break through the wall for repair, and sometimes it is not economically feasible.
⚠️ Attention: An attempt to break through the wall of the housing when searching for a leak can lead to complete failure of the refrigerator and the impossibility of restoring it.
Filter-drier, which is a small a metal cylinder, usually located near the compressor. It serves to remove moisture from the system, preventing the formation of ice plugs.
The capillary tube, despite its length, is compactly laid out and is often attached to the suction tube (going from the evaporator to the compressor) for heat exchange.
Why are the tubes not visible in new refrigerators?
Modern energy efficiency and design standards require minimizing protruding elements. Hidden heat exchangers are quieter and take up less space, but make repairs more difficult and expensive.
Diagnostics of freon leaks
It is possible to determine that freon has evaporated by a number of indirect signs. The first and most obvious symptom is the lack of cold when the compressor is running.
If the motor hums constantly without turning off, but the temperature in the chambers does not drop to the set values, this is a sure sign of a leak. Bloating of the side walls may also be observed.
To accurately determine the location of the leak, technicians use several methods. The simplest, most accessible and at home is a visual inspection and use of a soap solution.
- 🔍 Carefully inspect all visible pipe joints for traces of oil.
- 🧼 Apply soap foam to suspicious areas and watch for the appearance of bubbles.
- 👂 Listen: sometimes a leak under pressure can be heard as a quiet hiss.
Professionals use electronic leak detectors or ultraviolet lamps with the addition of a fluorescent dye to the system. These methods allow you to find microscopic holes invisible to the eye.
Particular attention should be paid to solder points and connections. This is where microcracks most often occur due to vibration or corrosion.
☑️ Symptoms of a freon leak
Hazards and safety measures
Working with refrigerants requires strict adherence to safety measures. Although modern freons (such as R600a or R134aare considered less hazardous to the ozone layer than their predecessors, they still carry risks.
Isobutane (R600a, which is now used in most household refrigerators, is a flammable gas. Its concentration in the air can lead to ignition in the presence of a spark.
When heated, some types of freons can decompose to form toxic substances such as phosgene. Therefore, it is strictly forbidden to heat the tubes with an open fire without first evacuating the system.
In addition, contact with liquid freon on the skin can cause frostbite, since with a sharp drop in pressure its temperature instantly drops to very low values.
⚠️ Attention: Never try to open the sealed circuit yourself or burn the remaining gas. This can lead to an explosion or poisoning.
If you smell burning or chemicals, immediately unplug the device, open the windows for ventilation and call a specialist.
Types of freons in household refrigerators
Modern household appliances use several main types of refrigerants. Knowing the brand of freon is important when ordering spare parts or calling a technician.
The most common one today is isobutane (R600a). This is a natural hydrocarbon gas that is highly energy efficient and environmentally friendly. It is used in most refrigerator brands Liebherr, Bosch, Indesit and others.
The second most popular is R134a. This is a synthetic refrigerant that replaced the banned R12. It is non-flammable, but requires higher pressure in the system compared to isobutane.
Old Soviet and early imported models could work on R12 (Freon-12). This gas is now banned for production due to its destructive effect on the ozone layer, but is still found in older appliances.
Each type of freon requires the use of a specific type of oil in the compressor. Mixing oils or using the wrong refrigerant will lead to rapid failure of the compressor.
The nameplate, usually located inside the chamber or on the back wall, always indicates the brand and amount of the required refrigerant. This information is critical for quality repairs.
Replacing one type of freon with another is possible only after completely flushing the system and changing the oil, which is a complex technological procedure.
Frequently asked questions
Can I fill the refrigerator with freon myself?
Theoretically, it is possible if you have a gas cylinder, scales, a pressure gauge station and a vacuum pump. However, without experience, there is a high risk of filling the wrong amount of gas or not removing moisture from the system, which will kill the compressor. In addition, working with isobutane (R600a) requires (explosion-proof) equipment.
How much does it cost to replace freon in a refrigerator?
The cost consists of the price of the gas itself (which is inexpensive), the work of the technician and the cost of field service. On average, leak detection and refilling can cost between 30% and 60% of the price of a new budget refrigerator. If the evaporator needs to be replaced, the price will be higher.
Why did the refrigerator stop freezing after defrosting?
Often, when defrosting the refrigerator, users use a knife or sharp objects to chip the ice. Careless movement will puncture the evaporator. The freon instantly evaporates and the system stops working. This is the most common cause of mechanical damage to the circuit.
How long does it take for freon to escape from a punctured refrigerator?
If the puncture is small, gas can escape for several hours or even days. If the damage is severe, the entire volume of refrigerant will be gone in a few minutes. The pressure in the system equalizes with atmospheric pressure, and circulation stops.
Is freon from a refrigerator harmful to humans?
In small quantities contained in a household refrigerator (usually 50-150 grams), modern freons do not pose a mortal danger after a single inhalation. However, they displace oxygen and can cause suffocation in confined spaces. Isobutane is also explosive at high concentrations.