Searching for the capillary tubes in the refrigerator Stinol - this is a key diagnostic stage when the unit stops freezing or works non-stop. Many owners of household appliances are faced with a situation where the compressor is humming, but there is no cold in the chambers, and the first suspicious element is this thin copper conductor. Understanding where the capillary tube is locatedis necessary for visual inspection, searching for kinks or planning work to clean the system.
In refrigerators of the brand Stinol, especially in popular models of the series 101, 102 and 103, the location of the refrigerant lines has its own design features. The capillary is not always immediately visible, as it is often hidden by thermal insulation or glued to the evaporator. For a successful repair, you will need not only to know the location of the part, but also to understand the symptoms of its malfunction, so as not to waste time disassembling a working unit.
Before embarking on the active phase of the search, you should make sure that the problem really lies in the hydraulic part of the system. If you notice that there is no characteristic uniform layer of frost on the back wall of the freezer, and the condenser grille at the back remains cold or only partially heats up, this is a direct signal that the circulation of freon is disrupted. Capillary tube in this connection it acts as a choke, and its blocking leads to a stop in cooling.
Design features of Stinol refrigerators
Refrigeration units Stinol are designed using a single-circuit or double-circuit cooling system, where the capillary tube plays the role of a pressure regulator. In the classic version, it is a long copper coil of very small diameter, usually from 0.6 to 0.9 mm. It is thanks to this narrowing that the necessary resistance is created for the transition of the refrigerant from liquid to gaseous state in the evaporator.
In models Stinol with the No Frost system or static cooling, the path of the refrigerant is laid in a specific way. Often the capillary is welded into the filter drier on one side and into the evaporator or inlet tube of the freezer on the other. Location of the tube depends on the year of manufacture and the specific modification of the refrigerator. In older models, it could run openly along the body, while in more modern versions it is hidden under a layer of polyurethane foam insulation or glued to aluminum sheets of the evaporator.
It is important to consider that the length of the capillary in refrigerators Stinol can reach several meters, rolled into a compact spiral This is done to save space inside the case. When searching, you need to focus on the place where the tubes enter the freezer, since this is where critical narrowing and possible blockage most often occurs.
⚠️ Attention: The capillary tube is made of copper and has extremely thin walls. Any careless movement with a sharp object when trying to reach it can lead to depressurization of the system and leakage of freon.
Understanding the design helps to suggest where exactly to look for the problem. If your Stinol uses a hidden capillary integrated into a foam circuit, visual search will be limited to accessible areas near the compressor and chamber inlet. In such cases, diagnosis is often carried out by indirect methods, since physical access to the central part of the tube without violating the integrity of the body is impossible.
The exact location of the capillary tube
To accurately determine where the capillary tube is located in your refrigerator Stinol, you need to remove the rear protective panel at the bottom of the unit where the compressor is located. It is in this zone that the starting point of the capillary is located. The tube comes out of the filter drier (copper cylinder), which is installed directly on the compressor discharge pipe or next to it.
Moving from the filter, you will see a thin copper tube that goes up along the back wall refrigerator. In most models Stinol it runs in a foamed space, but the initial section 10-15 cm long remains visible. Further, if the design allows, the tube can go around the freezer chamber or enter it through a special hole in the upper part.
- 📍 Compressor area: Here is the entrance to the capillary connected to the filter-drier. This is the most accessible place for inspection.
- ❄️ Freezer compartment: In models with an open evaporator, the capillary can be visible after removing the plastic panel inside the freezer.
- 🔩 Fastenings: The tube is often fixed with aluminum pads or adhesive tape to the walls of the chamber for heat exchange.
In refrigerators with a system No Frost the capillary tube often fits to the evaporator unit, which is hidden behind the back panel inside the freezer. To see the insertion point, you will have to remove the plastic cover after defrosting the unit. In this zone capillary enters the distributor or directly into the evaporator channels.
Sometimes, during previous repairs, craftsmen could change the location of the visible part of the capillary. If you see that the tube does not run along the wall, but lies loosely on the bottom or is attached with ties in an unusual place, this may indicate a previous replacement. In such cases, the search for blockages should begin precisely from the places of bends and connections.
Symptoms of blockages and malfunctions of the capillary
Determine that the problem lies precisely in capillary tube, it is possible according to a number of characteristic features. Unlike a freon leak, when the capillary is clogged, the pressure in the system is distributed unevenly. The compressor continues to work, trying to pump the refrigerant, but the circulation is disrupted. This leads to specific behavior of the refrigerator Stinol.
The first and main symptom is the lack of cold when the engine is running. You can hear the steady hum of the compressor, but the insides of the chambers remain warm. At the same time, the compressor itself may heat up more than usual, as it operates in overload mode. If you touch the condenser grille from behind, it may be warm only at the very beginning, going into the cold zone.
| Symptom | Probable cause | Action |
|---|---|---|
| The compressor runs constantly | Capillary blockage or leak | Checking the pressure in the system |
| Bloating of the refrigerator wall | Corrosion of pipelines | Visual inspection of the housing |
| No frost on the evaporator | No freon circulation | Diagnostics of the capillary system |
| The refrigerator turns off after 1-2 minutes | Thermal alarm is triggered relay | Checking the starting relay |
Another sign is the nature of the sound of the system. If you listen closely, you will notice that the gurgling of freon, which is usually heard during normal operation, is either absent or sounds muffled and intermittent. At the site of the blockage, if it can be reached, the tube may be cold or even covered with frost, while after the blockage it will be warm.
Often a blockage occurs due to moisture entering the system or oil breakdown products. Moisture freezes at the narrowest point of the capillary, forming an ice plug. This phenomenon is called "water hammer" or simply ice blockage. In such cases, the refrigerator may periodically “go away”: after a long period of inactivity, it begins to freeze, but after a few hours it stops again.
Diagnostics and methods for finding a blockage
For precise localization of the place where capillary tube has stopped leaking freon, professional diagnostics are required. A simple visual inspection is most often not enough, since the blockage may be inside the foam layer or in an inaccessible area of the evaporator. Masters use the nitrogen pressing method to determine resistance.
The essence of the method is to connect a pressure gauge station to the service fitting. If, when nitrogen is supplied, the pressure gauge needle stands still or rises very slowly, this indicates the presence of a solid blockage. If the pressure is maintained but drops extremely reluctantly, the tube may be partially clogged. It is important not to exceed the permissible pressure so as not to rupture capillary or other elements of the system.
☑️ Diagnosis of capillary blockage
There is also a local heating method. If there is a suspicion that a blockage has formed in an accessible part of the tube (for example, near the filter), this area is carefully heated with a hair dryer. If, after heating, circulation is restored even for a short time, it means that the blockage was caused by frozen oil or paraffin. However, for Stinol this method is often ineffective, since the main blockages occur deeper.
⚠️ Attention: It is strictly forbidden to blow through the capillary tube with your mouth! Moisture from your breath will enter the system, which is guaranteed to lead to the formation of a new ice plug and corrosion of the internal walls.
In some cases, a thermal imager is used for diagnostics. When the compressor is running, you can see the temperature difference along the tube. Before the blockage, the tube will have one temperature (usually warmer), and after that it will have a different temperature. This allows you to accurately determine the coordinates of the problem, even if the tube is hidden under insulation.
Technology for cleaning and replacing the capillary
If diagnostics have confirmed that capillary tube the refrigerator Stinol is clogged, there are two main solutions: try cleaning or complete replacement. Cleaning is only possible if the blockage is caused by oil or paraffin and is in an accessible place. For this, a hydraulic press or a special blowing device is used.
The cleaning process involves unsoldering the capillary from the filter and evaporator. Purified oil or a special solvent is supplied through a special adapter under high pressure, which should push the plug out. If the plug is icy, the system is evacuated and warmed up. However, if the blockage is caused by copper oxides or engine combustion products, cleaning rarely has a long-term effect.
Replacement capillary tube is a more reliable, but labor-intensive method. In service conditions, it looks like this:
- 🛠️ Dismantling: The old tube is carefully removed (or cut off if it is foamed).
- 📏 Selection: The new tube must have identical internal diameter and length. For Stinol this is critical for the correct operation of the thermostat.
- 🔥 Soldering: A new capillary is soldered into the filter and evaporator using silver solder.
Why can’t you just digest the old capillary?
Copper after long-term use loses its properties, and microscopic deposits accumulate inside. Welding the old capillary “short-circuit” or without replacing the filter will lead to re-clogging in a few months.
After replacement, the system must be evacuated for 15-20 minutes to remove moisture and air. Only after this is the refrigerator filled Stinol with R134a or R600a freon (depending on the modification) in strict accordance with the weight indicated on the nameplate.
Prevention and expert recommendations
In order for capillary tube your refrigerator Stinol to serve for a long time and not cause problems, it is important to follow the operating rules. The main enemy of the capillary is moisture and dirt. They enter the system due to unqualified repairs or a violation of the tightness of the circuit. Therefore, any repair work must be carried out in compliance with technology.
Do not allow the refrigerator to operate with a faulty thermostat. If the unit “does not turn off,” the compressor overheats, the oil in the system begins to coke and precipitate. This sediment eventually clogs the thin lumen of the capillary. Follow the cyclic nature of work: the normal mode is work for 10-20 minutes and rest for 20-40 minutes.
You should also avoid frequent defrosting using a hairdryer or boiling water. Sudden temperature changes can cause microdeformations in the places where the tubes are soldered and connected, which over time will lead to the appearance of cracks or peeling of the inner layer of the tube, which will block the passage.
If you notice that The refrigerator has started to work worse, do not wait for it to stop completely. Early diagnosis allows you to eliminate the problem at a stage when the blockage has not yet become critical and the compressor has not yet failed from overload. Taking good care of equipment Stinol extends the service life of the entire refrigeration system.
Is it possible to clean the capillary without disassembling the refrigerator?
It is impossible to completely clean the capillary without disassembling and unsoldering the tube. There are traditional methods of “pumping” through the Schrader valve, but they often lead only to temporary improvement or pushing dirt further into the system, which can finally finish off the compressor.
How much does it cost to replace a capillary tube in Stinol?
The cost consists of the price of materials (copper tube, filter, freon) and the complexity of the work. If the capillary is foamed into the body, the work is more expensive, since it requires laying a new capillary along the outer wall or complex cutting of insulation.
Why does the refrigerator freeze too much after replacing the capillary?
This may indicate an error in the length or diameter of the new tube. If the capillary is too short or wide, the resistance drops and too much liquid freon enters the evaporator, which causes deep hypothermia and the risk of compressor water hammer.
Can a tube from another refrigerator be used?
Can only be used if the characteristics completely match. Capillaries from different models Stinol or other brands may differ in length by several tens of centimeters and in diameter by hundredths of a millimeter, which is critical for the pressure in the system.