If you are faced with a situation where your Atlant refrigerator stops cooling and the motor-compressor is running non-stop, this may indicate a serious problem in the refrigerant circuit. Most often, the cause is capillary tube, the diameter of which is so small that even a microscopic particle of moisture or oxidation can completely block the movement of freon. In everyday life, this defect is called “blockage” or “blockage”, and it requires immediate intervention, since further operation can lead to the burning of an expensive compressor.
Restoring the patency of the system is a complex technical process that should ideally performed by professionals using a vacuum pump and nitrogen. However, if you have basic tool skills and understand the refrigeration circuit, you can try to clear the blockage yourself using mechanical or chemical cleaning methods. It is important to realize that working with refrigerant requires compliance with safety measures and accuracy so as not to damage other components of the unit.
In this article we will analyze in detail the signs of blockage, the necessary tools and a step-by-step algorithm of actions for removing blockages in Atlant models. You will learn how to properly prepare the system, what liquids to use for flushing and how to avoid typical mistakes that beginners often make when repairing household appliances on their own.
Signs and diagnosis of capillary blockage
The first and most obvious symptom of a malfunction is the absence cold in the chambers when the compressor is running. The motor hums continuously, trying to create pressure, but heat exchange does not occur. If at the same time the condenser (grid at the back) remains cold or warm only at the inlet, and the filter-drier is covered with frost or, conversely, is at room temperature, this is a sure sign that freon does not circulate through the system. In its normal state, the filter should be warm, since compressed gas passes through it.
Diagnostics can be carried out by exclusion. First, make sure that the thermostat is working and commands to turn on, and then check for gas leaks. If, when the fitting on the processor is punctured, gas comes out under pressure, but the refrigerator does not freeze, then the problem is precisely in the hydraulic resistance of the circuit. Often, the blockage is localized precisely at the junction of the copper tube into the steel one or inside the capillarycapillary itself, where the cross-section narrows to a minimum.
⚠️ Attention: Never try to depressurize the system if the compressor is energized. Sparks may ignite oil or residual refrigerant, causing a fire. Carry out all work only on equipment that is completely disconnected from the network.
There is also the concept of “hydraulic hammer” or “slap” when the compressor makes a loud knock when starting up. This occurs when liquid refrigerant or oil has accumulated in the cylinder due to an inability to force it through a clogged tube. Ignoring this sound can quickly disable the piston group, turning a simple repair into replacing the entire unit.
Necessary tools and materials
To successfully carry out the cleaning procedure, you will need a specific set of tools, which is not always in the arsenal of a home craftsman. The main element is a cylinder of dry nitrogen or, in extreme cases, compressed air, although the latter option is less effective due to the possible moisture content. It is also necessary to have a burner (gas or blowtorch) to heat the connections and solder, since it is impossible to remove old tubes without heating.
Technical alcohol or special solvents for refrigeration equipment, such as R141b are traditionally used as a cleaning agent (although its use is now limited by environmental regulations, it is often found in repairs). You will also need wire cutters, pliers, a file for cleaning the edges and, preferably, a new filter drier, since the old one is guaranteed to lose its properties after opening the circuit.
- 🔧 Blowtorch or portable gas torch with a cylinder.
- 🧪 Industrial alcohol, acetone or a specialized cleaning solution liquid.
- 🌬️ Cylinder with compressed air or nitrogen for purging.
- 🔩 New filter drier and solder (silver or tin-lead).
- 🛡️ Safety glasses and gloves for working with chemicals.
Special attention should be paid to eye safety. When heating copper tubing and working with chemical solvents, the risk of splashes or scale is very high. Safety glasses are not just a recommendation, but a necessity. Also prepare a container for draining used oil and flushing fluid, since disposing of them down the drain is prohibited by environmental regulations.
Preparing the refrigerator for repair
Before starting any manipulations, the refrigerator must be completely defrosted and dried. Moisture is the main enemy of the refrigeration circuit, and even a small amount of water inside the system, when frozen in the capillary, will create an ice plug that cannot be broken through mechanically. Therefore, after defrosting, leave the unit open in a warm room for at least 24 hours.
Next you need to gain access to the rear panel and the motor-compressor. Remove the protective casing, if equipped, and get to the place where the capillary tube is soldered into the compressor and filter drier. For ease of operation, it is often necessary to dismantle the refrigerator or place it on its side, being careful not to allow oil to get into the outlet circuit (if it is a model with a bottom hinge). Fix the position of the unit so that it does not swing during the soldering process.
| Preparation stage | Action | Goal |
|---|---|---|
| Defrosting | Waiting 24+ hours | Removing moisture from the chambers and insulation |
| Access | Removing the casing, moving away from the wall | Safe access to components |
| De-energizing | Disconnection from the socket | Preventing electric shock |
| Cleaning | Removing dust from the compressor | Reducing the risk of fire when soldering |
After preparing the surface, make sure that the work area is well ventilated. Freon vapors and solder combustion products are toxic. If you are working in a garage or workshop, open the gate or turn on the exhaust ventilation. Safety should come first, above the speed of work.
Mechanical cleaning method (Pushing)
The most common way to clear a blockage at home is the method of squeezing with liquid under pressure. The essence of the method is to create high pressure in the capillary tube using a syringe or balloon, which allows the plug to be pushed through. To do this, it is necessary to disconnect the capillary from the filter-drier, having previously heated the soldering area with a torch and quickly disconnected the tubes.
A tightly pressed tube from a syringe filled with solvent is inserted into the vacant hole, or the fitting of a nitrogen cylinder is connected. A sharp increase in pressure often allows you to break through the formed clot of paraffin or oxides. It is important to act quickly and confidently, since with slow injection the liquid can simply flow out through microcracks without creating the necessary water hammer.
☑️ Mechanical cleaning algorithm
If the blockage was broken through, you will hear a characteristic whistle of escaping air from the other side (from the evaporator). However, this method does not guarantee complete cleaning of the tube walls from plaque. Mechanical impact can dislodge the plug, but after some time it can again form a lump and block the cross-section. Therefore, after punching, a chemical washing stage necessarily follows.
⚠️ Attention: When using a cylinder with nitrogen or compressed air, never exceed the pressure of 15-20 atmospheres. Excessive pressure can rupture the thin walls of the aluminum evaporator, which will lead to irreversible damage to the refrigerator.
Chemical flushing of the system
Chemical flushing is necessary to remove residual oil, acids and small particles that could come off during mechanical operation cleaning To do this, a special liquid is used, which is poured into the circuit, kept for a certain time, and then blown out. The same alcohol or specialized compounds that do not leave a film after drying are often used as a flushing agent.
The process is as follows: flushing liquid is poured into the disconnected end of the capillary tube or through the process pipe of the compressor. Then the system is left for 15-30 minutes so that the chemistry dissolves the contaminants. After this, intensive blowing with dry air or nitrogen is carried out until dirt stops flying out of the tubes and the liquid becomes clean.
Pay special attention to the filter-drier. This element is disposable and must be replaced after opening the circuit. Inside it is zeolite or silica gel, which instantly absorbs moisture from the air. If you try to use an old filter, it will become saturated with water in a matter of minutes and again clog the capillary with an ice plug after a few days of operation.
Why can’t you use water for flushing?
Water in the refrigeration circuit is a disaster. At temperatures below zero, it turns into ice, which tightly clogs the capillary. In addition, water reacts with the refrigerant and oil, forming aggressive acids that corrode the metal from the inside.
After flushing, make sure that there is no excess liquid left in the system. Blowing should be continued until the inner walls are completely dry. The presence of solvent residues can change the properties of the refrigerant and oil, which will lead to reduced cooling efficiency or damage to the compressor.
Assembly, evacuation and charging
After successful cleaning and rinsing, the assembly stage begins. In place of the old filter, a new one is installed, corresponding to the model of your Atlanta. The tubes are connected end-to-end and sealed with hard solder. It is important not to overheat the connection so that the copper does not flow and solder the passage, but also to ensure the tightness of the seam. The quality of soldering directly affects the durability of the repair.
Vacuuming is a critically important step. Before charging with freon, all air and moisture vapor must be removed from the system. To do this, a vacuum pump is connected to the processor pipe, which runs for 20-40 minutes. The residual pressure should be no more than 50 microns (or as close to zero as your pump can handle). Neglecting this step guarantees that the blockage problem will recur in the near future.
- 🔥 Heat the soldering area evenly so that the solder flows on all sides.
- 💨 Vacuum the system for at least 30 minutes to ensure moisture removal.
- ❄️ Refill the refrigerant strictly according to the weight indicated on the refrigerator nameplate.
- 🔍 Check all seams with soapy water for leaks.
Refrigerant refilling is carried out with the compressor running (if the valve design allows) or using the static pressure method, followed by monitoring the current consumption of the motor. The amount of freon must strictly correspond to the standard indicated on the technical sticker inside the chamber or on the back wall. Underfilling will lead to poor cold, and overfilling will lead to increased pressure and possible rupture of tubes or breakdown of the compressor.
Typical mistakes and precautions
Many amateur craftsmen make the mistake of trying to clean the capillary without removing it from the refrigerator or unsoldering the filter. This is a “blind” method that often does not work because you cannot see where the clog is moving. Additionally, using open flame sources near the refrigerator's plastic parts or insulation may cause a fire. Always use a fireproof screen or wet cloth to protect surrounding parts.
Another common mistake is using the wrong cleaning fluids, such as gasoline or chlorine-containing solvents. Residue from such substances can react with the compressor oil, forming a thick emulsion or solid residue that will clog the system even worse than the original clog. Use only proven, volatile and inert liquids to the materials of the circuit.
⚠️ Attention: If you are not confident in your abilities or you do not have a vacuum pump, do not undertake a complete recharge of the system. In this case, it is more economically feasible to call a professional technician, since the cost of a damaged compressor and lost products may exceed the price of the service.
It is also worth remembering that modern Atlant refrigerators can use different types of refrigerants (R134a, R600a). Isobutane (R600a) is explosive and requires special care and avoidance of sparks when handling it. If this particular gas is indicated on the nameplate of your unit, it is better not to take risks and entrust the repair to a certified specialist.
Is it possible to clean the capillary without unsoldering it from the compressor?
Theoretically, you can try to push the blockage through the process pipe by connecting a nitrogen cylinder. However, the effectiveness of this method is extremely low. The pressure will be distributed throughout the entire volume of the system, and there may not be enough force to break through a dense blockage in a narrow capillary. In addition, you will not be able to properly flush the system and replace the filter, which makes such repairs a temporary measure.
How to understand that the blockage is broken?
When blowing with compressed air or nitrogen on one side of the capillary tube, a strong air flow should be felt on the other end (from the evaporator side). If you blow with your mouth (this is hygienically questionable, but it’s suitable for checking the flow) or use a blower, the air should flow freely, without the characteristic whistle of breaking through the narrow hole that was there before cleaning.
Is it necessary to change the oil in the compressor after cleaning?
In most cases, with high-quality flushing of the system, it is not necessary to change the oil if only a large amount of flushing fluid or dirt did not enter the system. However, if the oil in the compressor is black, has a burning smell or contains visible suspended matter, replacing it along with flushing the compressor (through the technological hole) will be the right solution to extend the life of the unit.
Why does the refrigerator freeze after cleaning, but after a week it stops?
Most likely, there is moisture left in the system that was not removed when vacuuming. Over time, moisture accumulates in the capillary and freezes, forming an ice plug. This is a classic sign of a bad vacuum or an old filter drier. The procedure must be repeated with mandatory filter replacement and long-term vacuuming.