Search capillary tube in the Indesit refrigeration unit often becomes the first stage of diagnosis when the equipment stops freezing or begins to work intermittently. Many owners mistakenly believe that this thin element is visible immediately after removing the rear metal panel, but the real design Indesit has its own technological features that hide critical components.
The capillary is located in close proximity to the evaporator, but it is possible to reach it without violating the factory seal or deep disassembling the case is almost impossible in most modern models. Understanding where this section of the line passes is necessary for correctly assessing a breakdown, be it a blockage or mechanical damage. where exactly passes this section of the highway, it is necessary to correctly assess the breakdown, be it a blockage or mechanical damage.
In this article we will analyze in detail the anatomy of the refrigeration system, explain why the tube is often hidden in a foamed layer, and what signs indicate problems specifically in this zone. You do not need to be a professional master to understand the principles of operation refrigeration circuit and make the right decision on further actions.
Design features of the Indesit refrigeration system
Refrigerators brand Indesit, especially models of previous years of production were often equipped with evaporators foamed directly into the walls of the case. This engineering solution is aimed at increasing the useful volume of the chamber and reducing the noise level, but it significantly complicates access to internal components. Capillary tube in such systems it passes inside the thermal insulating layer of polyurethane foam, adjacent to the evaporator channels.
Visually detect the entry point of the tube into the foamed the zone is possible only along the characteristic bend of the copper line at the rear wall of the refrigerator or freezer. Often this area is covered with a decorative plastic cover or a layer of additional insulation. Copper capillary has a very small diameter, usually about 0.6–0.8 mm, which makes it vulnerable to careless disassembly.
It is important to understand that in two-compressor models, each circuit has its own independent capillary located in the corresponding section. If you Indesit with a No Frost system, the tube will be located in an area hidden behind the plastic panels of the freezer, next to the defrost heating element.
⚠️ Attention: Trying to cut out the foam layer to find the tube without special equipment can lead to damage to the evaporator channels and leakage of freon, which will make repairs cost-effective impractical.
Knowing the exact location of the elements helps the master determine whether the game is worth the candle. Sometimes it is easier to replace the entire unit or call a specialist with a vacuum pump than to try to locally restore the tightness at home.
Visual identification of the capillary tube
To find capillary, you need to know what it looks like and how it differs from other copper tubes of the refrigeration unit. Unlike the discharge and return lines, which have a much larger diameter, the capillary tube looks like a thin thread. It connects the filter-drier to the entrance to the evaporator.
In the public domain, that is, outside the refrigerator body, you can see only the initial section of the tube coming from the filter. It is often wound in a spiral for compactness or laid in loops in the niche of the compressor compartment. Tube diameter remains constant along the entire length until it enters the foaming zone.
- 🔍 Thickness: Visually resembles a thick fishing line or wire, significantly thinner than other tubes.
- 📍 Location: Always comes from the copper cylinder (filter-drier) and goes deep into the housing or to the evaporator.
- 🌡️ Temperature: In working condition, the area after the filter can be warm, and before entering the evaporator - cold.
When diagnosing, technicians often focus on the soldering area. The connection filter-drier and the capillary is a control point. If you see that the tube suddenly changes direction and goes behind the metal sheet of the back wall, most likely it goes further inside the insulation.
In models with an open evaporator (crying type), the capillary can be taped with aluminum tape to the surface of the evaporator or glued into a special groove. In this case, it is visible immediately after removing the back panel inside the chamber, but it is often covered with a plastic box or a layer of frost.
Typical locations in different models
The gasket configuration capillary tube directly depends on the series of the refrigerator Indesit. In budget models of the BIA or CIB series, manufacturers often used a scheme where the tube runs along the perimeter of the freezer. In more modern lines, such as Indesit EF or DShidden evaporators are used.
In two-chamber refrigerators with one compressor, the capillary for the refrigeration chamber can be placed on the external circuit (heat exchanger by door perimeter or side walls), while the freezing circuit is located inside. This creates confusion during the search, since cold zone is unevenly distributed.
| Model / Series | System type | Capillary localization | Availability |
|---|---|---|---|
| Indesit BIA 16 | Static | Behind the rear panel of the freezer | Low (foamed) |
| Indesit CIB 18 | No Frost | Inside the evaporator unit | Required disassembly |
| Indesit DS 318 | Full No Frost | Hidden in the case | Absent |
| Indesit ES 19 | Crying | On a visible evaporator | High |
Particular attention should be paid to models with the system Full No Frost. Here the capillary tube is completely integrated into the factory unit and cannot be locally replaced without disturbing the geometry of the evaporator. In such cases, repair comes down to replacing the entire assembly or installing an external evaporator.
If you are the owner of an older model with a visible leaf evaporator, you are in luck. The capillary in them is often glued to the surface or inserted into a profile. However, even there it may be covered with a layer of rust or corrosion, which makes visual inspection difficult.
Symptoms of a malfunction of the capillary system
You can understand that the problem lies precisely in capillary tubeby indirect signs of the operation of the refrigerator. Most often, we are talking about a blockage that prevents the circulation of the refrigerant, or an ice plug that forms at the point of narrowing of the diameter.
The first signal is uneven cooling. The freezer may be operating normally, but the refrigerator compartment may not be able to maintain its temperature. Or, on the contrary, the compressor hums continuously, but there is no cold anywhere. This indicates that freon circulation the circulation of freon is disrupted
- 🧊 Ice crust: The appearance of local swelling of ice on the back wall at the entry point of the tube.
- 🔇 Silence: Absence of the characteristic sound of gurgling or flow of gas after the compressor stops.
- 🔥 Filter heating: The filter drier remains cold or, conversely, overheats, although it should be slightly warm.
Another sign is the operation of the compressor with short cycles or, on the contrary, without shutting down. If Indesit it hums for hours, but does not freeze, the capillary may be clogged with oil breakdown products or moisture. Moisture in the system freezes in the narrowest part of the tube, cutting off the flow of refrigerant.
Why does ice blockage occur?
An ice plug is formed due to moisture entering the circuit. This can happen due to poor-quality evacuation of the system during a previous repair or due to microcracks through which air was drawn in. Water freezes in the capillary, blocking the passage of freon. When the refrigerator is turned off, the plug melts and it begins to freeze again for a short time.
Diagnostics and cleaning methods
Professional diagnostics capillary system requires a pressure gauge station and a vacuum pump. The technician connects to the service fitting and checks the pressure. If, when the compressor is running, the suction pressure goes into a deep vacuum, and the discharge pressure increases, but there is no cold, this is a sure sign of a blockage.
There are several methods for eliminating the problem. The simplest, but temporary, is to try to push the plug through with pressure. However, this method is risky and may cause the tube to rupture at a weak point. A more reliable method is hydraulic flushing or nitrogen purging.
The heating method is often used to localize the blockage. The section of the tube where an ice or paraffin plug has formed will have a temperature different from the rest of the line. Sometimes local heating with a hairdryer helps, but this must be done extremely carefully so as not to damage the insulation of the wires or the plastic of the case.
⚠️ Attention: The use of open fire to heat copper tubes is strictly prohibited due to the risk of igniting freon leaks and damaging the varnish coating of the compressor winding.
If blowing does not help, the capillary tube needs to be replaced. This is a complex procedure that requires the selection of a tube of a strictly defined length and diameter, since the refrigerant depends on these parameters. An incorrectly selected capillary will lead to incorrect operation of the entire system. throttling refrigerant. An incorrectly selected capillary will lead to incorrect operation of the entire system.
☑️ Signs of the need to replace the capillary
Replacement of the capillary tube: technical aspect
Replacement capillary —this is not just soldering a new copper tube. This is a recalculation of the hydraulic resistance of the circuit. In the factory, the length and diameter are selected to the nearest millimeter. When doing self-repairs or handy work, craftsmen often use an empirical method for selecting capillaries
The process begins with dismantling the old capillary. If it is foamed, it may not be removed completely, but cut and welded, laying a new tube along the outer wall or in an accessible channel. New capillary wound onto a template to give it the shape of a coil similar to the factory one.
Soldering is carried out in a nitrogen environment or using special fluxes that do not require rinsing. It is important not to overheat the junction of the filter and the tube, since there is zeolite inside the filter, which, when heated strongly, can spill out and clog a new capillary instantly. Therefore, when soldering, the joint is often cooled with a damp cloth.
After installation, the system is evacuated for 15–20 minutes to remove moisture and air. Then the calculated amount of refrigerant is charged. For Indesit most often used R134a or R600a (isobutane), and the latter is explosive, which requires special care when soldering.
Prevention and care of the cooling system
To avoid problems with capillary tube and blockages in the future, you must follow the rules for operating the refrigerator Indesit. The main reason for moisture and dirt getting into the circuit is a violation of the tightness during unqualified repairs or long-term downtime of equipment in an unheated room.
Do not allow the refrigerator to operate with a damaged door seal. The constant entry of moist air leads to freezing of the evaporator and, as a result, to an increase in the load on the defrost system. Although this does not directly affect the capillary, the overall wear and tear of the unit is accelerated.
- ❄️ Defrost: Regularly defrost the refrigerator (if it is not No Frost) to prevent the accumulation of ice mass.
- 🛑 Protection: Protect the back wall from impacts and punctures when washing or moving.
- 🔌 Power: Use a voltage stabilizer so that the compressor operates normally without frequent starts and stops.
It is also worth remembering about the service life of the equipment. After 10–12 years of operation, the oil in the compressor loses its properties and can become coked, clogging the narrow passages of the capillary. In such cases, replacing the tube gives only a temporary effect, and more serious intervention is required.
When a call to the technician is necessary
Despite detailed instructions, there are situations when independent repair refrigeration circuit is impossible or dangerous. If you do not have the skills to work with a gas burner, a vacuum pump and scales for refilling freon, it is better not to take risks.
This is especially true for isobutane models (R600a). A leak of this gas in a confined kitchen space while attempting to solder can result in a volumetric explosion. In addition, isobutane is odorless, and it is difficult to detect a leak without a leak detector.
A specialist will also be needed if the entire evaporator needs to be re-welded. This is a labor-intensive process that requires removing the camera's internal plastic lining, which without experience can lead to breakage of the plastic elements of the body. Professional repairs guarantee the preservation of geometry and thermal insulation.
⚠️ Attention: Design details and location of components may vary depending on the year of manufacture and the specific modification of the refrigerator. Always check the technical documentation or service manual for your model before starting work.
Remember that saving on calling a specialist for complex work with the circuit often leads to double costs. An attempt to save money on diagnostics may result in the purchase of a new refrigerator.
Is it possible to clean the capillary without opening the case?
In some cases, if the blockage is at the beginning of the capillary (near the filter), it is possible to flush with nitrogen under high pressure through the service fitting. However, if the plug has formed deep in the foamed area or is caused by waxing of the oil, such a procedure may not produce results or damage the tube.
Why does the Indesit refrigerator hum, but not freeze?
This is a classic sign of a refrigerant circulation problem. The compressor works, creating pressure, but freon does not enter the evaporator due to a blockage in the capillary tube or a leak. Diagnostics of the pressure in the system is required.
How much does it cost to replace a capillary tube?
The cost consists of the price of materials (copper tube, filter, freon) and the complexity of the work. Since the procedure requires vacuuming and precise filling, it is a medium or complex repair and can account for a significant portion of the cost of a new budget refrigerator.
Is it dangerous to solder refrigerator tubes yourself?
Yes, it is dangerous. Firstly, there is a risk of ignition of freon vapors (especially isobutane). Secondly, poor soldering will lead to repeated leakage after a short time. Thirdly, there is a risk of damaging other components when heated.