How to solder the refrigerator tubes yourself: a detailed guide with photos and tips craftsmen

Freon leakage from the refrigerator is one of the most common malfunctions faced by owners of equipment older than 5-7 years. The reason most often lies in microcracks or mechanical damage copper tubes to the cooling circuit. If you notice that the refrigerator has stopped freezing, the compressor is running non-stop, and oily stains have appeared on the back wall, most likely the system has depressurized. In service centers, for such repairs they ask from 3,000 to 10,000 rubles, but if you have the tools and patience you can solder the refrigerator tubes yourself.

In this article we will figure out how to determine the location of the leak, what materials and equipment will be required for soldering, as well as in detail Let us describe the process of restoring the tightness of the circuit. We will pay special attention Safety precautions —working with refrigerant and open flame requires strict adherence to the rules. If you have never held a burner in your hands or are not familiar with the structure of a refrigeration unit, it is better to entrust the repair to professionals. But if you are ready to try, our instructions will help you avoid mistakes and save on calling a technician.

Signs of a freon leak and diagnosis of damage

Before you start soldering, you need to make sure that the problem is the depressurization of the tubes. Here are the key symptoms of a refrigerant leak:

• 🔴 The compressor works without stopping, but the refrigerator is not cooling. This is the most obvious sign - the system is trying to compensate for the loss of pressure.
• 🌡️ The temperature in the chambers rises to room temperature, despite the maximum thermostat settings.
• 💧 oily spots appear on the back wall of the refrigerator - this is oil leaking from the compressor along with freon.
• ❄️ On the evaporator (in the freezer) no frost or it is formed only in certain areas.
• 🔊 When the refrigerator is running, you can hear hissing this is freon coming out through a microcrack.

For accurate diagnosis use soap solution (even dishwashing detergent will do). Apply it with a brush to suspicious areas of the pipes - bubbles will appear at the leak site. An alternative method is ultraviolet additive in freon (if the refrigerator has previously been serviced). Under a UV lamp, the leak site will glow bright yellow or green.

⚠️ Attention: Do not confuse a freon leak with a broken thermostat or compressor! If the refrigerator turns on but quickly turns off, or the compressor does not start at all, the problem may be in the electrics, and not in the tightness of the circuit.

If you find the location of the damage, evaluate its nature:

• 🔧 Microcrack (up to 1 mm) - you can solder without replacing the area tubes.
• 🔨 Through hole (1-3 mm) - installation of a patch or replacement of a fragment will be required.
• 💥 Rupture or corrosion (more than 3 mm) - replacement of the entire section of the tube is required.

Tools and materials for soldering refrigerator tubes

For high-quality soldering of copper tubes, specialized equipment will be required. Do not try to make do with improvised means - this will lead to repeated leakage or damage to the refrigeration circuit. Here is a complete list of what you will need:

If you If you are soldering tubes for the first time, take copper-phosphorus solder (for example, Castolin 192) - it does not require high temperature and is well suited for beginners. Experienced craftsmen often use silver solder (for example, Harris Stay-Silv 15), since it gives a more durable seam, but its melting point is higher. (700-800°C), which can damage nearby plastic parts of the refrigerator.

To protect your eyes and hands, be sure to prepare:

• 👓 Safety glasses (from ultraviolet radiation burners).
• 🧤 Kevlar gloves (ordinary fabric ones will not protect against burns).
• 😷 Respirator (during soldering, harmful fumes are released).
• 🔥 Fire extinguisher (just in case - work is carried out with an open flame).

⚠️ Attention: Never use tin-lead solder (as for electrical wiring) It does not withstand freon pressure and will quickly leak. avoid acid fluxes —they corrode copper and lead to corrosion.

Preparing the refrigerator for soldering: draining the freon and disassembling

Before you start soldering, it is necessary remove completely. freon from the system. Working with refrigerant under pressure is extremely dangerous - when heated, the tube can burst, and freon (especially R-600ahere is a step-by-step preparation instruction:

1. Disconnect the refrigerator from the network and let it stand for 1-2 hours (so that the pressure in the system drops).
2. Remove the back cover refrigerator to gain access to the compressor and pipes.
3. Find the service port (usually a copper tube with a cap on the compressor).
4. Connect the pressure gauge station to the service port. Open the valve to bleed off the remaining freon (do this outside or in a well-ventilated area!).
5. Pinch the tubes special pliers or pliers in two places: before the compressor and after the evaporator. This will prevent air from entering the system.

If you do not have a pressure gauge station, you can bleed the freon through piercing the tube (but this is an extreme case!). For this:

1. Put on gloves and glasses.
2. Take a thin awl and carefully pierce the tube in a place where it is not adjacent to the body.
3. Let the freon come out (it will hiss). Do not direct the jet towards yourself - some refrigerants (for example, R-600a) are flammable!
4. After bleeding, bend the punctured area with pliers.

When the freon is removed, you can proceed to purging the system with nitrogen (if possible). This will remove any moisture that may have gotten into the tubes. Without purging, the risk of corrosion and repeated leakage increases by 2-3 times. Nitrogen is supplied under a pressure of 4-6 bar for 5-10 minutes.

Drain freon through the service port|Press the tubes with pliers|Purge the system with nitrogen (optional)|Clean the soldering area from oxides|Prepare the torch and solder-->

Technology for soldering copper tubes: step-by-step instructions

Now we move on to the most important stage - soldering. It is important here to observe the temperature regime and not to overheat the tubes, otherwise the copper will lose strength. Here are the detailed instructions:

1. Cleaning and preparing the soldering area

Use sandpaper (grain size 120-180) or wire brush clean the damaged area from oxides and dirt. Then wipe it acetone or alcohol - this will remove traces of grease. Apply flux a thin layer with a brush. The flux should cover an area 1-2 cm wider than the hole itself.

2. Heating the tube

Turn on the gas burner and adjust the flame so that it is blue color (this indicates the optimal temperature). Heat the tube evenly by moving the flame back and forth. Do not point the torch at one point - this may burn the copper! The optimal temperature for soldering with copper-phosphorus solder is 250-300°C.

How to understand that the tube is ready for soldering?

• 🔥 The flux becomes liquid and shiny.
• 💧 When touched solder, it begins to melt.
• 🔴 Copper changes color to darker (but not black!).

3. Applying solder

When the tube is heated, bring the solder to the soldering area. It should spread on its own across the surface under the action of capillary forces. There is no need to “rub in” the solder with a soldering iron - this will break the tightness of the seam. For microcracks, a layer of solder 1-2 mm thick is sufficient. If the hole is large (more than 1 mm), apply a patch patch of copper foil or a cut piece of tube.

After soldering, let the seam cool naturally (do not cool with water!). Then remove any remaining flux with a damp cloth - it can cause corrosion.

What to do if the solder does not stick?

If the solder rolls up into balls and does not spread, this means that:

1. The tube is not heated enough (the temperature needs to be increased).

2. The flux is of poor quality or applied in too thin a layer (repeat cleaning and reapply flux).

3. Any grease or oxides remain on the surface (wipe again with acetone).

4. You are using the wrong solder (check the markings).

4. Checking the tightness

After the seam has cooled, it must be checked for tightness. To do this:

1. Connect pressure station to the service port.
2. Supply the system nitrogen at a pressure of 10-15 bar.
3. Apply soap solution to the soldering area.
4. If there are no bubbles, the seam is sealed. If bubbles appear, you need to re-solder.

⚠️ Attention: Never check the tightness with freon! The refrigerant pressure is several times higher than that of nitrogen, and if there are microdefects, the seam may burst, releasing freon into the room.

Filling the refrigerator with freon after soldering

When soldering is completed and the seam is checked, you can begin k filling the system with freon. Here it is important to use exactly the same refrigerantwhich was in the refrigerator initially. The type of freon is indicated on compressor nameplate or in the technical data sheet. The most common options:

• 🔵 R-134a - used in most modern refrigerators.
• 🟢 R-600a (isobutane) - environmentally friendly, but flammable freon (found in models Indesit, Atlant, Beko).
• 🔴 R-12 - outdated freon, prohibited in new models (if your refrigerator is over 20 years old, it needs to be replaced).

For refilling you will need:

• 🔧 Gauge station with a vacuum pump.
• 💨 Freon cylinder (volume depends on the refrigerator model, usually 30-100 g).
• 🔄 Filter drier (be sure to replace it before refilling!).

Step-by-step instructions for refilling:

1. Connect the vacuum pump to the service port and pump out the air from the system (10-15 minutes). This will remove moisture.
2. Close the pump valve and watch the pressure gauge - the pressure should remain stable (if it drops, there is a leak!).
3. Connect the cylinder with freon through the pressure gauge station. Open the valve and fill the system in portions, controlling the pressure.
4. Normal pressure for R-134a: 0.2-0.5 bar suction (low pressure) and 8-12 bar discharge (high pressure).
5. Turn on the refrigerator and check the operation of the compressor If it turns on and. turns off cyclically - refueling was successful.

If after refueling the refrigerator does not cool, the following problems are possible:

• 🔴 Insufficient freon (need to be topped up).
• 🔵 Clogged in the capillary tube (nitrogen purge or replacement required).
• 🟡 The compressor is faulty (check the windings with a multimeter).

Typical mistakes when soldering pipes and how to avoid them

Even experienced craftsmen sometimes make mistakes that lead to repeated leakage or breakdown. refrigerator. Here are the most common mistakes and ways to prevent them:

Another critical mistake - ignoring the replacement of the filter drierThis element absorbs moisture and acids from the system. If it is not replaced after soldering, moisture will enter the compressor and cause it to fail. 1-2 months. The filter drier is inexpensive (from 200 ₽), but its replacement is required!

Also, many people forget about nitrogen leak test before refilling freon Nitrogen is cheaper than the refrigerant, and its pressure. allows you to identify even microscopic defects in the seam. If you skip this step, the risk of repeated freon leakage is up to 30%.

When soldering does not help: cases requiring replacement of pipes

Soldering is not always the optimal solution. In some cases replacement of a section of the tube it will be cheaper and more reliable than repeated attempts to solder. damage. Here are the situations when soldering is pointless or dangerous:

• 🔧 Corrosion of the tube in an area of more than 3 cm - even after soldering, rust will continue to destroy copper.
• 💥 Multiple cracks in one section - soldering of each defect will weaken the tube.
• 🔥 Damage at the bend —the solder does not withstand mechanical loads.
• 🧊 The tube is mounted in polyurethane foam (refrigerator insulation) - get to it without disassembling the case impossible.
• 🔄 Repeated leakage After two or more soldering attempts, it is better to replace the section.

If the tube is damaged in foamed part the refrigerator (for example, in the freezer), soldering without disassembling the case is impossible. In this case, there are two options:

1. Call a specialist with equipment for foam-free soldering (cost from 5,000 ₽).
2. Replace the refrigeratorif its age is more than 10 years (repairs can be more expensive than new equipment).

Also, soldering is impractical if it is damaged capillary tube - its diameter is too small for high-quality soldering. In this case, it is necessary to replace the entire capillary unit, which is practically impossible at home.

⚠️ Attention: If your refrigerator runs on freon R-12 (outdated refrigerant), its repair is not economically feasible. This freon is prohibited from production, and its analogs (R-134a) are not always compatible with old compressors. It is better to consider purchasing new equipment.

FAQ: Frequently asked questions about soldering refrigerator tubes

❓ Is it possible to solder refrigerator tubes with a regular soldering iron?

No, a regular soldering iron (even with a power of 100 W) is not suitable for soldering copper tubes under pressure. The soldering iron temperature (maximum 400°C) is not high enough for copper-phosphorus or silver solder, and tin-lead solder will not withstand freon pressure. For high-quality soldering you need gas burner with a flame temperature of at least 1,000°C.

❓ How much freon is needed to refill the refrigerator?

The volume of freon depends on the model of the refrigerator and is indicated on compressor nameplate. On average:

• Single-chamber refrigerators: 30-50 g.
• Double-chamber: 60-100 g.
• Side-by-Side: 100-150 g.

Excess freon is as harmful as its deficiency! Always follow the manufacturer's recommendations.

❓ Is it possible to use argon welding instead of soldering?

Theoretically yes, but in practice it is impractical. Argon welding requires professional equipment and skills, and for copper tubes with a thickness of 0.5-1 mm it is too “rough”. Soldering with copper-phosphorus solder gives a more accurate and airtight seam. Welding is justified only for thick-walled pipes (from 2 mm), which are not used in domestic refrigerators.

❓ What to do if after soldering the refrigerator does not cool?

There may be several reasons:

1. Lack of freon —check the pressure with a pressure gauge and add refrigerant.
2. Clogged capillary tube —nitrogen purge or replacement of the capillary is required.
3. Compressor malfunction —check the windings with a multimeter (resistance should be 20-40 Ohms).
4. Repeated leakage —check the seam with a soap solution.
5. Clogged filter drier —replace it with a new one.

If you cannot determine the reason yourself, contact a service center.

❓ Which freon should you use to refill an old refrigerator?

It depends on the model:

• Refrigerators until 1995 usually work on R-12, but this freon is prohibited. It can be replaced with R-134a, but you will need to change the oil in the compressor (mineral → synthetic).
• Refrigerators 1995-2010 most often used R-134a.
• Modern models (after 2010) can work on R-600a (isobutane) or R-134a.

The type of freon is indicated on compressor nameplate (metal plate on the back side refrigerator). If the nameplate is missing, look for the refrigerator model on the Internet.