Finding the location where refrigerator capillary tubeis often the first step in diagnosing serious problems, such as lack of cold or the formation of an ice coat. This part is the heart of the refrigerant circulation system, and its correct location is critical to understanding the operating principle of the unit. Unlike large components, such as a compressor or condenser, this element is hidden from the user’s eyes and requires disassembly for visual inspection.
In most modern models, be it Indesit, Atlant or LG, the tube is laid inside the heat-insulating layer or glued to the evaporator. You won’t be able to find it from the outside just by looking behind the back wall - it is integrated into the design of the freezer or hidden in the foamed space of the case. Understanding its route helps the technician quickly localize a leak or mechanical damage.
If you are faced with the fact that the refrigerator has stopped freezing, but the compressor is running continuously, there is a high probability that the problem lies in the freon circulation circuit. Capillary performs the throttling function, creating the necessary pressure difference between high and low pressure in the system. Without this element, the phase transformation of the refrigerant necessary to remove heat from the chamber is impossible.
Functional purpose and principle of operation
The main task of this thin copper pipeline is to create hydraulic resistance flow refrigerant. The compressor pumps freon at high pressure into the condenser, where the gas cools and turns into liquid. Next, this liquid enters the capillary, where it expands sharply and evaporates, absorbing heat from the internal volume of the chamber. The length and internal diameter are selected with mathematical precision for each model.
It is important to understand that capillary tube has no moving parts and valves. Its work is based solely on the physical properties of the narrow channel. Any change in diameter, for example due to moisture ingress and ice blockage, instantly disrupts the cooling cycle. This is why absolute dryness and cleanliness are so important in the system.
In modern dual-circuit systems, two such elements can be used to independently regulate the temperature in the freezer and refrigerator compartments. This complicates the design, but increases energy efficiency. If one of the circuits fails, this is often manifested by uneven cooling of the products.
⚠️ Attention: An attempt to clean the tube by blowing with your mouth or a compressor without evacuating the system will lead to moisture entering and instantaneous failure of the unit.
Location in various types of refrigerators
The answer to the question of where it is located capillary tubedirectly depends on the type of defrosting system. In refrigerators with a manual defrost (“crying” evaporator), it is most often soldered to the aluminum plate of the main evaporator, located at the top of the freezer or on the back wall of the refrigerator compartment. The tube can be glued to the surface of the coil or inserted into its channels.
In systems No Frost the situation is more complicated. Here the capillary is often hidden inside the foam layer of the housing or routed along the door heating circuit to prevent the seal from freezing. In such models, access to it is possible only after dismantling the internal plastic lining and removing part of the polyurethane foam, which requires professional intervention.
Sometimes, especially in old Soviet models or industrial cabinets, you can find an open gasket where the copper tube is visible visually. However, in home appliances of the last 15-20 years, hidden installation has prevailed to improve thermal insulation and aesthetics. You can find the place of entry and exit by tracing the path from the filter-drier to the entrance to the evaporator.
Symptoms of a malfunction of the capillary system
You can diagnose a problem with the capillary by a number of indirect signs that appear in the operation of the unit. Most often, users notice that the refrigerator is humming, but not cooling, or the freezer is working normally, but the refrigerator compartment is warm. This indicates a violation of the circulation of the refrigerant.
Among the main symptoms, the master identifies:
- 🧊 Freezing of the inlet into the evaporator or, conversely, a complete absence of frost on the evaporator tubes when the compressor is running.
- 🔊 Change in operating sound of the engine: it can work quieter than usual or with periodic clicks, trying to start.
- 🌡️ Condenser overheating: the rear grille may be hot only at the beginning or, conversely, remain cold along its entire length.
- ❄️ Ice coat: in No Frost systems, ice may form in in places not intended for this, blocking the air channels.
If you notice that the tube coming from the compressor is covered with frost right up to the motor housing, this is a sure sign that liquid freon does not have time to evaporate in the evaporator and returns to compressor This is extremely dangerous for the engine and can lead to water hammer.
Table: Comparison of signs of blockage and leakage
Often the symptoms of a capillary (clogging) are confused with a freon leak, since in both cases the refrigerator stops cooling. However, there are nuances that make it possible to distinguish one problem from another before taking pressure measurements.
| Parameter | Capillary clogged | Freon leak | Compressor malfunction |
|---|---|---|---|
| Temperature condenser | Hot, especially at the beginning | Cold or room temperature | Can be hot or cold |
| Compressor operation | Works constantly without turning off | Works cyclically or for a long time | May not start or hum |
| Condition of the compressor tubes | One is hot, the other is cold | Both are at room temperature | Depends on the type of breakdown |
| Pressure in the system | High on discharge, low on suction | Close to atmospheric (zero) | Low on suction, high on injection |
This table helps to initially classify the problem. However, an accurate diagnosis is made only after connection pressure station. Visual inspection provides only 60% of the information, the rest is a matter of instruments and the experience of the master.
Methods for finding the location of damage or blockage
To determine exactly where the problem is in the capillary system, specialists use the method of alternately cutting off sections or heating. If an ice plug is suspected, local heating of the section of the tube at the entrance to the evaporator with a hairdryer sometimes helps. If after this a characteristic sound of passing gas appears and the refrigerator begins to freeze, the diagnosis is confirmed.
In the case of mechanical blockage (for example, copper oxidation products), a more complex procedure is required. The technician can cut off the capillary tube at the inlet to the filter drier and check the permeability by blowing nitrogen. If the gas does not pass, it means the capillary is clogged and requires replacement or complex flushing.
☑️ Diagnostics of the capillary system
It is worth remembering that in systems with aluminum evaporatorswhich are often found in models Beko or Stinol, the capillary can be built directly into the evaporator housing. In such cases, repair often does not involve replacing the tube, but installing an external evaporator (“dovetail”), since it is impossible to restore the tightness of the factory channel.
Replacement process and repair features
Replacing a capillary tube is a labor-intensive process that requires availability of special tools: burner, vacuum pump and filling station. The new tube must have exactly the same parameters (diameter and length) as the original one. Using a tube with other characteristics will upset the balance of the system, and the refrigerator will either not freeze or the compressor will work with overload.
The replacement process includes the following steps:
- 🔥 Dismantling: carefully soldering the old tube from the filter and evaporator, observing the temperature regime so as not to melt the aluminum parts.
- 🧹 Blowing: cleaning the system of oil residues and contaminants with dry nitrogen under high pressure.
- 🔧 Installation: installing a new capillary, which is often supplied in a coil and requires careful unwinding so as not to pinch.
- 💨 Evacuation: removal of air and moisture from the circuit for 30-40 minutes.
- ⛽ Filling: introduction of a strictly dosed amount of refrigerant according to the nameplate on the compressor.
⚠️ Attention: The length of the capillary directly affects the pressure in the system. Cutting off an excess piece “by eye” will lead to incorrect operation of the refrigerator. Use only calibrated tubes.
Why can’t you use a tube from another refrigerator?
Different models have different compressor power and evaporator volume. The pipe from a small refrigerator in a large unit will create excess pressure, which will lead to rupture of pipes or breakdown of the compressor.
Prevention and service life
With proper operation capillary tube it lasts as long as the refrigerator itself - 10-15 years or more. It has no rubbing parts and does not wear out on its own. The main enemies of the element are moisture that has entered the system during poor-quality repairs, and oil breakdown products when the compressor overheats.
To extend the life of the cooling system, you should not often open the door for a long time, allowing a large amount of moist air to get inside the chamber. You should also avoid storing products with damaged packaging, which can emit aggressive vapors that destroy metals and oils.
Regular defrosting (for drip systems) and cleaning the drainage hole also indirectly affect the stability of operation. If you notice that the refrigerator has started to work longer or noisier, do not delay calling a technician. Early diagnosis allows you to get by by replacing the filter-drier without touching the capillary itself.
Is it possible to restore the patency of the capillary yourself?
Theoretically, if the clog is ice-cold, defrosting it within 24 hours will help. If the blockage is mechanical, it is impossible to restore passability at home. A professional nitrogen flush or element replacement is required.
Where is the capillary located in the Indesit No Frost refrigerator?
In such models, it is usually laid inside a foam layer around the perimeter of the freezer compartment or hidden behind a plastic panel inside the chamber. Access to it requires disassembly.
What is the diameter of a standard capillary tube?
In household refrigerators, the internal diameter is usually from 0.6 to 0.9 mm, and the length varies from 2 to 4 meters depending on the power of the compressor.
Why does the refrigerator not work after replacing the capillary? is it freezing?
Possible reasons: the length of the tube is incorrect, insufficient evacuation (moisture remains), incorrect dose of freon, or the filter drier has not been replaced.