How to change freon in the refrigerator: complete instructions

The situation when the refrigerator stops freezing, and an unpleasant smell appears inside or a “fur coat” freezes, often indicates a leak. refrigerant. Many equipment owners immediately begin to look for how to change freon themselves, hoping to save on calling a technician. However, it is worth understanding that replacing the refrigerant is a complex technical process that requires specialized equipment and skills in working with metals.

Unlike simply replacing a lamp or seal, working with the refrigeration circuit involves breaking the tightness of the system. This means that you will have to not just “fill in the gas”, but carry out a full pressurization with nitrogen and proper refueling. If you ignore at least one stage, the compressor may fail within several weeks. vacuumization, nitrogen pressure testing and proper filling. If even one step is ignored, the compressor may fail within a few weeks.

In this article we will analyze in detail all the stages of restoring the unit's functionality. You will learn what tools are needed, how to find the leak and why R134a or R600a cannot just be released into the atmosphere. We will look at the nuances of working with different types of refrigerants and analyze the typical mistakes that beginners make.

Diagnostics and detection of refrigerant leaks

Before taking active steps, you need to make sure that the problem lies precisely in a freon leak, and not in a malfunction of the thermostat or start relay. The primary symptom is often a running compressor with no cold in the chambers at all. If the motor hums continuously but does not turn off, this is an alarming signal.

To accurately localize the damage, technicians use leak detectors or a soap solution. At home, you can try to carefully inspect the evaporator and condenser tubes for oily stains. Freon circulates in the system along with oil, so a characteristic mark often remains at the point of depressurization.

⚠️ Attention: If you find mechanical damage to the tubes or swelling of the wall inside the chamber (where the evaporator is sealed), the likelihood of successful self-repair is sharply reduced. In such cases, it is often necessary to replace the entire evaporator.

You should also pay attention to the smell. Although modern refrigerants often do not have a distinct aroma, when compressor windings burn or leak along with oil, a specific chemical odor can appear. This indicates that the system worked in extreme conditions.

Necessary tools and workplace preparation

Replacing freon is impossible without special equipment. You will need not only a gas cylinder, but also tools for soldering, vacuuming and pressure control. The kit of a professional or an advanced amateur should include a pressure gauge station, a vacuum pump and a torch.

Pay special attention to the choice of solder and flux. For copper tubing, silver or copper-phosphorus solder is usually used. Aluminum parts, which are found in some models of evaporators, require special fluxes and solders, since ordinary tin-lead will not provide tightness.

• 🔧 Gauge manifold (preferably with three hoses for convenience).
• 🔥 Gas burner with a set of nozzles for colored soldering metals.
• 🌬 Vacuum pump for removing moisture and air from the circuit.
• ⚖️ Electronic scales for precise dosing of refrigerant.
• 🔪 Pipe cutter and rolling machine for working with copper tubes.

Preparation of the workplace is also critical. Ensure good ventilation of the room, since during soldering and possible escape of gases, air circulation is necessary. All flammable objects must be removed from the work area.

Dismantling and removing old refrigerant

The process begins with completely disconnecting the refrigerator from the power supply. Safety is priority number one. After this, you need to gain access to the compressor and filter drier. Usually, to do this, remove the back panel or lower casing of the unit.

Removing residual pressure is a mandatory step. If there is freon left in the system under pressure, it cannot simply be released into the room, especially if it is R600a (isobutane), which is explosive. The puncture of the capillary tube or service pipe must be carried out carefully, using a piercer or carefully soldering the connection.

After releasing the pressure, the filter-drier is dismantled. This element is disposable and must be replaced whenever the circuit is opened. The old filter contains an adsorbent that could be saturated with moisture and acids formed during the operation of the system.

⚠️ Attention: When working with isobutane (R600a), it is strictly forbidden to use sparking power tools near open pipes. Make sure there are no sources of open flame in the room.

If a dead plug or blockage is found in the system, it may be necessary to purge the circuit with nitrogen. This helps remove oil breakdown products and mechanical contaminants that could have gotten inside during previous repair attempts or during operation.

Soldering pipelines and replacing the filter drier

Soldering copper pipes requires skill. The burner flame should be directed evenly at the joint in order to heat both parts being joined. Solder should melt from the heat of the metal, not from direct contact with a flame. This is the only way to achieve high-quality sealing of the seam.

When installing a new filter-drier, it is important to follow the flow direction indicated by the arrow on the housing. The filter is installed last before evacuation in order to minimize the time of contact of the adsorbent with atmospheric air. Moisture is the main enemy of the refrigeration system.

The table below shows the main soldering parameters for different materials used in refrigeration equipment:

The quality of the solder joint is checked visually. The seam should be smooth, without sagging or cracks. If you are a beginner, practice on scraps of pipes before soldering expensive refrigerator components.

Evacuating the system: why is it necessary

Many amateurs skip this stage, considering it unnecessary, and make a fatal mistake. Evacuation is necessary to remove air and, most importantly, water vapor from the circuit. The water in the system freezes in the capillary tube, forming an ice plug that blocks the circulation of freon.

In addition, at low pressure, water boils at room temperature, which allows you to effectively “pull” moisture from hard-to-reach places. The process should last at least 30-40 minutes, and ideally up to an hour, especially if the system has been open for a long time.

A vacuum gauge is used to control the vacuum depth. However, in domestic conditions, they often focus on the operating time of the pump and the absence of “gurgling” of oil in the pump inspection window. After completing the procedure, first close the valve on the manifold, and only then turn off the pump so that oil does not rush into the system.

⚠️ Attention: If after vacuuming the pressure gauge needle quickly creeps up, it means there is a leak in the system. Repeat checking the seams with a soap solution.

Filling the refrigerator with freon and checking operation

The most crucial moment is refueling. The amount of refrigerant must strictly comply with the norm indicated on the compressor nameplate or in the technical documentation. For accuracy, it is better to use electronic scales by placing the cylinder on them.

Refilling is carried out with the compressor running through the service pipe. Gas is admitted in small portions, monitoring the pressure on the pressure gauge and the temperature of the evaporator. It is important to prevent water hammer when liquid freon enters the compressor.

The operation is checked according to the following parameters:

• ❄️ Uniform cooling of the evaporator (starts from the filter and goes along the entire length).
• 🌡 Temperature at the outlet of the compressor (should be warm, but not hot).
• 🔊 No extraneous noise or gurgling in the tubes.
• 📉 The suction pressure must correspond to the type of refrigerant (for R134a it is lower than for R12).

After refilling, the service pipe is pinched, sealed and the quality of the last seam is checked. Tightness is a guarantee of the long life of your refrigerator.

Common mistakes when replacing yourself

One of the most common mistakes is saving on the filter drier. Installing an old or cheap filter can lead to a repeat. failure in a month due to capillary clogging or acid formation in the system.

Overheating of the tubes leads to the formation of scale inside, which then circulates through the system and clogs bottlenecks.

Ignoring the type of refrigerant - even more. one risk. Filling a system designed for R134awith freon R12 or R600a without changing the oil and thoroughly flushing is unacceptable. automotive freon?

Is it possible to fill a refrigerator with car freon?

It is strictly forbidden. Automotive freons (often with additives of dyes or UV oils) and household ones have different chemical compositions and requirements for compressor lubrication. Using the wrong refrigerant will lead to compressor failure.

How much does it cost to replace freon in the service?

The price depends on the model of the refrigerator, the type of refrigerant and the complexity of the work (for example, if you need to digest a foamed evaporator). On average, the cost consists of the price of materials (freon, filter, work) and can vary widely.

How often does freon need to be changed?

In a working, sealed refrigerator. freon never needs to be changed. It circulates in a closed circuit and is not consumed. Replacement is required only when a leak is detected or after the system is repaired.

Is freon dangerous for humans?

Modern household freons (R134a, R600a) are low-toxic in low concentrations, but displace oxygen. R600a explosive at a concentration in air of more than 13%. Old freons (R12) upon contact with an open flame can form toxic phosgene.