The situation when the refrigerator stops freezing, and the compressor works without stopping or, conversely, is silent, often indicating a refrigerant leak. In everyday life, this phenomenon is called “disappearance of freon,” although technically the gas does not disappear anywhere without mechanical damage to the system. Replacing freon is a complex technological process that requires special equipment, soldering skills and a deep understanding of thermodynamics. Attempts to solve the problem by simply “adding” gas without looking for a leak will only lead to a temporary effect and repeated failure of the equipment.
Unlike refilling the air conditioner, where refilling is sometimes acceptable, the cooling system of the refrigerator Indesit, Atlant or Bosch is a sealed circuit. If the gas has escaped, then a hole has formed. Professional repairs begin not with the cylinder, but with diagnosing the integrity of the tubes and finding the location of depressurization. That is why the question “how to change freon” always implies a full repair of the unit, and not just service.
In this article we will analyze in detail the stages of professional replacement of refrigerant, explain why independent actions are dangerous, and consider the cost of the work. You will learn what tools the craftsmen use and how the system is prepared to work with new gas. Modern refrigerants R600a (isobutane) are explosive, which strictly prohibits work in unventilated areas without a spark-proof tool.
Diagnostics of leaks and troubleshooting
Before starting to replace the gas, the technician must localize the location of the leak. A refrigeration system consists of many connections, and most often depressurization occurs at solder joints or in the evaporator. Primary diagnostics include visual inspection and listening to the operation of the compressor. If the engine hums, but there is no cold, or the operating cycles are too short, this is a sure sign of low pressure in the circuit.
Professional equipment is used to accurately determine the location of the gas outlet. The master connects the pressure gauge station to the process pipe. If the device shows zero pressure, nitrogen is forcibly pumped into the system at a pressure of up to 10-15 atmospheres. This allows you to hear a characteristic sound at the site of damage or detect a leak using a soap solution.
- 🔍 Leak detector —an electronic device that captures gas molecules in the air and emits a sound signal.
- 💧 Soap solution —a classic method in which bubbles appear at the point where gas escapes under pressure.
- 🌊 Immersion in water —used to check individual components (condenser, evaporator) after their dismantling.
It is important to understand that simply finding a hole is not enough. Often leaks are hidden in the foamed part of the case, where the built-in evaporatoris located. In such cases, diagnostics require high qualifications, since visual inspection is impossible without opening the thermal insulation.
Necessary equipment and tools
High-quality replacement of the refrigerant is impossible without specialized tools. An amateur set of “wrench and screwdriver” will not work here. The main device is a vacuum pump, which is necessary to remove moisture and air from the system before refueling. Residual moisture in the circuit will lead to the formation of ice plugs in the capillary tube and failure of the compressor.
The second key element is a freon charging station equipped with high-precision scales. The amount of refrigerant in modern refrigerators is measured in grams (usually from 30 to 60 grams for household models). Refilling or underfilling critically affects performance and energy consumption.
The master will also need:
- 🔥 Gas torch —for soldering copper tubes with soft solder.
- 🧪 Solder and flux —materials for creating hermetically sealed connections.
- 🔧 Set rollers —for preparing the ends of the tubes for connection.
- 🧹 Filter drier - a mandatory element that is replaced every time the circuit is opened.
The use of low-quality equipment can lead to dirt or moisture getting into the system, which will turn expensive repairs into a constant problem.
Stages of professional replacement freon
The process of replacing refrigerant is strictly regulated by technical standards. Violation of the sequence of operations can lead to compressor failure in the first hour of operation. Below are step-by-step instructions describing the actions of a qualified specialist.
☑️ Algorithm of the wizard's actions
The first step is always to eliminate the cause of the leak. If the tube is damaged, it is sealed or replaced. If the evaporator is broken, it is either replaced with a mounted one or restored. After sealing the circuit, a new one is installed filter-drier. The old filter is already saturated with moisture and will not be able to perform its function.
Next comes the most important stage - vacuuming. A vacuum pump is connected to the system, which pumps out the air for 15-30 minutes. This reduces the pressure in the circuit to a minimum, allowing the removal of water vapor that boils at low pressure even at room temperature. Only after creating a deep vacuum is the system ready for refueling.
Refilling is carried out strictly according to the weight indicated on the technical sticker of the refrigerator (usually located inside or behind). The cylinder with freon is placed on an electronic scale, and the gas is launched into the system in the off state, and then, after starting the compressor, the remainder is added. R134a and R600a require different approaches to refueling due to differences in physical and chemical properties.
Features of working with different types refrigerants
Modern refrigerators use mainly two types of refrigerants. Not only the price of repairs, but also the technology for carrying them out depends on the type of gas. Mixing different types of freons is strictly prohibited, as this changes the pressure in the system and the properties of the oil.
R134a (Tetrafluoroethane) is a colorless, odorless, non-flammable gas. It has a high dissolving ability, so systems with this freon require careful cleaning to remove contaminants. The pressure in the circuit with R134a is higher than in older models, which requires more durable connections.
R600a (Isobutane) is a natural hydrocarbon gas. Its main advantage is high energy efficiency and environmental friendliness. However, it ignites at a concentration in air from 1.3% to 8.5%.
⚠️ Attention: When repairing refrigerators using isobutane, it is prohibited to use open fire in the immediate vicinity of the unit. The technician must use a spark-proof tool or work in a ventilated area in compliance with all fire safety standards.
Differences also apply to the compressor oil used. For R134a, synthetic POE (polyester) oil is used, which is hygroscopic (absorbs moisture). For R600a, mineral oil is often used, which is less sensitive to moisture, but requires cleanliness of the system.
Cost of work and factors influencing the price
The price of replacing freon varies widely and depends on many factors. You should not focus on the minimum numbers in advertising, since they often indicate the cost only for “visit” or “diagnosis”, and the main work is paid separately.
| Factor | Influence on cost | Approximate share in price |
|---|---|---|
| Type refrigerant | R600a is often more expensive to operate due to safety measures | 10-15% |
| Leak location | Replacement of the evaporator is more expensive than soldering the tube | 40-60% |
| Urgency | Weekend departure or at night | +20-30% |
| Refrigerator model | No Frost is more difficult to disassemble than a drip system | 10-20% |
The price usually includes: a technician’s visit, diagnostics, materials (freon, solder, filter drier) and the work itself. If you need to replace the evaporator (“crying” or in the freezer), the price can increase one and a half to two times, since this is a labor-intensive operation.
Why can’t you just “blow” freon?
Simple refilling without evacuation will leave air and moisture in the system. The moisture will freeze in the capillary tube, creating an ice plug. The refrigerator will stop freezing after a few hours or days, and the compressor will work with overload, which will lead to its combustion.
Why you can’t replace freon yourself
Many equipment owners wonder: is it possible to save money and carry out the repairs yourself? The answer is clear: no. This is due not only to the complexity of the process, but also to risks to health and property.
Firstly, refilling requires freon in cylinders, which are not sold in regular stores. Secondly, without a vacuum pump it is impossible to remove moisture. Thirdly, soldering copper tubes requires experience: overheating will lead to the formation of oxides inside the tube, which will clog the system, and underheating will lead to repeated leakage.
- 🚫 No warranty - independent repairs will deprive you of the right to free service.
- 💸 Risk of breakdown - an error in the amount of gas or the presence of moisture will kill compressor.
- 🔥 Fire hazard —working with gas and fire without skills is extremely dangerous.
An attempt to save 2-3 thousand rubles by calling a technician can lead to the purchase of a new refrigerator, since the cost compressor and its replacement often exceeds the price of a new budget unit.
Frequent questions and problems after refilling
After a professional replacement of freon, the refrigerator should work immediately or within 30-40 minutes. However, sometimes nuances arise. For example, in models No Frost complete cooling of all chambers can take up to 2-3 hours. You should not load food into a warm chamber immediately after repair.
If after refilling the compressor runs without stopping, but there is not enough cold, there may be an air lock in the system or the amount of refrigerant is selected incorrectly. In such cases, you need to call the technician again to adjust the dose. Recharged the refrigerator will consume more electricity and freeze worse.
⚠️ Attention: If you smell gas after repairs, immediately open the windows for ventilation, do not turn on electrical appliances and call a technician. This may indicate poor-quality soldering of the joints.
It is also important to monitor the temperature in the chambers on the first day. In the freezer the temperature should drop to -18°C, in the refrigerator - to +4...+5°C. If this does not happen, it means that the process was completed incorrectly.
How long does it take to replace freon in a refrigerator?
On average, the whole process takes from 1.5 to 3 hours. This includes diagnostics, leak detection, soldering, filter installation, evacuation (30 min) and refilling. In difficult cases that require replacing the evaporator, the time may increase to 4-5 hours.
Is it possible to fill the refrigerator with another type of freon?
It is absolutely not possible. Each type of refrigerant (R134a, R600a, R12) requires a specific type of compressor oil and is designed for a specific pressure. Mixing or replacing the type of gas will lead to breakdown of the compressor and lubrication system.
Why does the refrigerator freeze worse after refueling?
There may be several reasons: incorrect dosage of gas (underfilling or overfilling), the presence of an air lock in the system, poor-quality evacuation (moisture remains) or a leak that has not been completely eliminated. Repeated diagnostics are required.
Is it necessary to change the compressor when replacing freon?
No, the compressor is replaced only if it burns out or fails mechanically. In the event of a normal freon leak, a serviceable compressor is maintained. However, if the system has been working for a long time with a leak, the technician may recommend replacing it due to the risk of overheating.