The situation when the refrigerator compressor Atlant works continuously, and there is no cold inside the chambers, often indicates a critical violation of the refrigerant circulation. In most cases, the culprit is a blockage capillary tube, the diameter of which is only a few millimeters. A microscopic plug of paraffins, copper oxides or moisture can completely stop the operation of the refrigeration circuit, turning expensive equipment into a useless cabinet.
Restoring the patency of the main line requires not only the presence of special tools, but also a deep understanding of the physics of the processes, occurring inside a sealed system. Capillary pipeline performs the function of a throttle, creating the necessary pressure difference between high discharge pressure and low suction pressure. Any violation in this fine balancing leads to emergency operation of the engine-compressor.
Before taking active steps, it is necessary to clearly diagnose the problem, since the symptoms of a blockage can easily be confused with a freon leak or a malfunction of the compressor itself. In this article, we will analyze in detail the technological nuances of cleaning, methods for removing moisture and the features of evacuation of the system. Atlant.
Diagnostics of a clogged capillary system
The primary sign of a clogged capillary tube is the characteristic thermal mode of operation of the condenser (the grille at the back of the refrigerator). If, when the compressor is running, only its initial part heats up, and the rest of the area remains cold, this is a sure sign that freon is not circulating through the circuit. In normal condition, the entire grate should be uniformly warm or hot.
Another important indicator is the temperature of the compressor housing. When clogged capillary tube the engine may heat up more than usual due to operation in suction vacuum mode, or, conversely, remain cold if the thermostat quickly turns it off. Accurate diagnosis requires connecting a manometric manifold to measure the pressure in the system.
⚠️ Attention: If you find that the tube going to the evaporator is covered with frost only at the very entrance to the chamber, and then goes dry, this may indicate a partial blockage or the presence of an ice plug in the area capillary.
To definitively confirm the diagnosis, technicians often use the method of biting the filter-drier. If, when the system depressurizes, gas under pressure escapes from the cut tube with a characteristic whistle, it means that the compressor is working properly, and the problem lies precisely in the patency of the line after the filter. Lack of pressure indicates a compressor breakdown or a complete leak.
Necessary tools and preparation of the workplace
High-quality cleaning of the capillary tube is impossible without specialized equipment that ensures tightness and process control. The basic set includes a gas torch with solder, a pressure gauge station, a vacuum pump and a nitrogen cylinder for purging. The use of open fire requires strict adherence to fire safety rules.
Particular attention should be paid to preparing the workplace, since working with refrigerants and open flames requires good ventilation. You will also need wire cutters, pliers, technical alcohol for flushing and a new filter drier, which must be installed to replace the old one whenever the circuit is opened.
- 🔧 Manometric manifold with a set of hoses for pressure control.
- 🔥 Gas torch and solder for soldering copper connections.
- 💨 A cylinder with dry nitrogen for purging the system from contaminants.
- 🧪 Vacuum pump to remove moisture and air from the circuit.
It is important to prepare a container with water or soap solution to check the quality of soldering. Tightness of connections is the key to long-term operation refrigerator after repair. Any microscopic crack in the seam will lead to rapid release of freon and repeated repairs.
Nitrogen purging technology and removal of plugs
The main method of cleaning the internal cavity of a capillary tube is purging with dry nitrogen under pressure. This process allows you to push out mechanical impurities and oil residues that may have become coked in tight spaces. The nitrogen pressure must be strictly controlled so as not to damage the thin walls of the tubes.
The procedure begins by disconnecting the capillary tube from the filter drier and evaporator. Nitrogen is supplied through a special fitting, and the gas flow is directed towards the compressor or condenser, depending on where the blockage is expected. A strong gas flow effectively blows out foreign particles.
Blowing pressure: 10-15 atmospheres
Blowing time: 30-60 seconds
If simple blowing does not help, the method of “tapping” or heating the site of the suspected blockage is used. The thermal expansion of the metal, combined with vibration and gas pressure, often breaks down dense wax deposits. However, this method requires care not to overheat the copper.
After successful purging, you must ensure that the gas flows freely through the entire length of the tube. To do this, you can dip the end of the tube into oil or water and observe the bubbles. Uniform bubbling indicates restored patency of the capillary pipeline.
Replacing the filter-drier and soldering connections
The filter-drier is a mandatory element for replacement during any intervention in the sealed circuit of the refrigerator. Atlant. Inside it is zeolite or silica gel, which absorb moisture and acid residues. After opening the system, this material is instantly saturated with moisture from the air and loses its properties.
The process of soldering a new filter requires quick and accurate operations. The copper must be cleaned to a shine, apply flux and evenly heat the joint with a torch. Solder should flow into the gap under the action of droplet forces, forming a monolithic connection without voids.
| Parameter | Value / Description | Note |
|---|---|---|
| Solder type | Copper-phosphorus (BCuP) | Does not require additional flux for copper |
| Melting temperature | 700-800 °C | Depends on the composition of the alloy |
| Cooling time | Natural | It is forbidden to cool with water or air |
| Planting depth | 15-20 mm | To ensure joint strength |
Special attention Pay attention to the direction of flow indicated by the arrow on the filter housing. Installing the filter in the wrong position can lead to the destruction of the filter element and the entry of granules into capillary tubewhich will cause instant re-clogging.
⚠️ Attention: Do not hold the burner flame in one place for too long, so as not to burn out the copper tube. Copper becomes brittle when heated strongly and can burst when cooled.
Evacuation of the system and charging with freon
After soldering all connections and installing a new filter, a critical stage begins - evacuation. Moisture and air remaining in the system not only reduce the efficiency of the refrigerator, but can also cause chemical reactions that destroy the compressor from the inside. The vacuum pump is connected to the service connection.
The process of pumping out air should last at least 30-40 minutes for household refrigerators Atlant. During this time, the pressure in the system drops to values at which water boils at room temperature and evaporates, removing from the circuit along with the air.
☑️ Evacuation checklist
After achieving the required vacuum, the system is charged with refrigerant. The type and quantity of freon are indicated on the label located inside the refrigerator compartment or on the back wall. It is better to refill in the liquid phase through a filter drier or on a running compressor through the suction tube, controlling the engine current.
Why can’t you refill a refrigerator “by eye”?
An insufficient amount of freon will lead to overheating of the compressor and insufficient cold, and an excess will cause an increase in condensation pressure and possible rupture of the tubes or leakage motor failure.
Common mistakes when repairing a capillary system
One of the most common mistakes is ignoring the replacement of the filter drier. Hobbyists often assume that if a filter looks intact, it can be reused. This is a fatal mistake, since visual integrity does not guarantee the preservation of the sorption properties of the filler.
Another mistake is insufficient vacuuming time. Many people believe that 10 minutes is enough, but to completely remove moisture adsorbed on the walls of the tubes and windings of the compressor, a longer process is required. Moisture in the system is a guarantee of the formation of an ice plug in a short time.
- ❌ Using unsuitable solder (for example, tin-lead) for high-temperature areas.
- ❌ Blowing the system with a compressor instead of nitrogen, which introduces moisture and oil.
- ❌ Lack of control of engine current when filling with freon.
- ❌ Overheating of the capillary tube during soldering, leading to a change in its internal diameter.
Poor-quality soldering is also common, when solder flows inside the tube, narrowing the flow area. This creates an artificial blockage that is almost impossible to remove without overcooking the connection. Seam quality control should be a priority at every stage.
Prevention and operating rules
To extend the life of your capillary system Atlanta, you must follow the operating rules. Avoid long-term storage of products with damaged packaging, especially those containing acids, which can evaporate and, when combined with moisture, form aggressive compounds.
Regular defrosting of the refrigerator (if it is not a No Frost system) is also important. Although the capillary tube is located inside a closed circuit, the general condition of the heat exchangers affects the operating temperature of the compressor. Overheating promotes the decomposition of oil and the formation of paraffins.
⚠️ Attention: Never try to clean the capillary tube mechanically (with wire), as you are guaranteed to damage its thin walls or disrupt the geometry of the turns, which will lead to irreversible damage.
Monitor the condition of the door seals. The intake of warm air causes the compressor to work longer, increasing the condensation temperature and accelerating the aging of the refrigerant and oil. An integrated approach to maintenance will avoid costly repairs of the circulation system.
Is it possible to flush the capillary tube with a solvent?
Rinsing with a solvent is possible only in a specialized service using special installations, which then completely remove the solvent. At home, this method is dangerous, since solvent residues can react with compressor oil or plastic parts, and it is also difficult to completely remove liquid from a narrow tube.
How much does it cost to replace a capillary tube?
The cost consists of the price of materials (tube, filter, freon, solder) and the work of the technician. Replacing a capillary tube is a labor-intensive process that requires high qualifications, so the price can be significant, often making up a significant part of the cost of a new refrigerator.
How to understand that it is the capillary that is clogged and not the filter?
When the filter is clogged, only the compressor heats up, and the condenser is cold. If the capillary is clogged, part of the condenser may heat up to the point of the clog. The exact answer is given only by opening the system and checking the permeability with nitrogen: if the filter does not allow gas to pass through, it is clogged; if gas flows through the filter, but does not go through the capillary, the problem is there.
Is it necessary to change the compressor if the capillary is clogged?
Not always. If the blockage is caused by oil waxing or contamination, the compressor can be saved by flushing the system. However, if the blockage occurs due to combustion of the windings and the entry of combustion products into the circuit (acid blockage), then replacing the compressor is mandatory, otherwise the new motor will quickly fail.