Many owners of household appliances are faced with a situation where the refrigerator stops freezing or works intermittently, and technicians diagnose problems with the circulation of the refrigerant. In such cases, it is often mentioned discharge tube, which is a critical element of the cooling system. Understanding where it is located and what role it plays will help you better navigate the description of the malfunction or make a decision on self-diagnosis.
This part is part of a closed circuit along which freon, compressed by the compressor, moves. The location of the tube depends on the specific model Indesit, Bosch or LG, but the general design principle of the refrigeration unit remains similar. The discharge pipe always connects the compressor outlet valve to the condenser (grid on the rear wall).
If you are planning a repair, it is important Be aware that tampering with a sealed circuit requires special equipment. However, visual inspection of this area will often reveal mechanical damage or traces of oil that indicate a leak. Next, we will analyze in detail the anatomy of the system and tell you what to pay attention to.
Design and role of the discharge pipe
To find the right element, you need to understand the principle of operation of the refrigeration cycle. The compressor compresses the refrigerant gas, increasing its pressure and temperature. It is through discharge pipe this hot gas under high pressure enters the condenser. This is where the main heat exchange with the environment occurs.
The tube is usually made of copper or steel and has a small diameter. In modern models, such as Stinol or Atlant, it can be hidden behind decorative panels or foamed in thermal insulation. The length of this section varies, but its task remains the same - transporting an aggressive medium without loss of pressure.
Why does the tube heat up?
In normal operation, the discharge tube and the first turns of the condenser should be hot (up to 60-80°C). This indicates that the compressor is working and freon is circulating. If the tube is cold while the engine is running, there may be no gas in the system or the capillary is clogged.
It is important to note that it is in this area that the maximum pressure is created in the system. Therefore, the integrity of the connections is of paramount importance here. Any microcrack will lead to the rapid release of refrigerant and the refrigerator will stop working.
Exact location: where to look for the part
For most users, the question “where is it located” comes down to searching for visible parts at the back of the unit. In classic models with an open condenser (grid), the discharge tube is immediately visible. It comes out of the top of the black barrel-shaped compressorlocated in the niche at the bottom rear.
In models with a foamed condenser (when the grille is built into the side walls or rear panel), the situation is more complicated. Here the tube goes directly into the refrigerator body. Access to it often requires partial disassembly or removal of the compressor. In two-compressor systems, for example, in Liebherr, each motor will have its own independent discharge circuit.
- 🔍 Inspect the bottom of the back wall of the refrigerator - there is a motor-compressor there.
- 🔍 Find the copper tube coming out of the top of the compressor (usually there are two of them, but the discharge one is thicker or goes to the grill).
- 🔍 Follow the path of the tube: it should lead to the condenser coil or go into the housing wall.
Sometimes manufacturers use adapter inserts or filter-driers immediately after leaving the compressor. In this case, the discharge line will consist of several segments connected by soldering. Be careful when inspecting these joints.
Visual diagnostics and signs of malfunctions
Understanding where the tube is located allows for initial diagnosis. Freon circulation problems are often visible to the naked eye. If you notice oily spots in the area where the tube exits the compressor, this is a sure sign of depressurization. The oil comes out along with the gas, leaving a characteristic trace.
Another important aspect is temperature. As already mentioned, the discharge tube must be hot. If the compressor hums, but the tube remains cold, the valves inside the motor may have been damaged or formed clogging in the system. In some cases, the tube may be hot only at the outlet, and then cool down, which also indicates a problem with the flow.
Mechanical damage often occurs during transportation or careless cleaning. If you hit the back wall, you can damage the thin metal of the tube leading to the condenser. In models Samsung or Haier with thin walls, this happens quite often.
⚠️ Attention: If you notice a whistling sound of gas coming out or a strong oil leak, stop using the device immediately. Operating a compressor without proper freon cooling can lead to its combustion in a matter of minutes.
Table: Characteristics of discharge line elements
For a deeper understanding of the system design, let's consider the main parameters of the elements associated with the discharge pipe. This data will help you navigate the technical documentation or when talking with a technician.
| System element | Location | Function | Typical problems |
|---|---|---|---|
| Discharge valve | Inside the compressor | Outlet of compressed gas | Wear of the plate, loss of tightness |
| Discharge tube | From the compressor to the condenser | Freon transportation | Corrosion, mechanical breakdown |
| Filter drier | At the entrance to the capillary (after the condenser) | Cleaning and removing moisture | Clogging, loss of adsorbent properties |
| Condenser | Rear wall or in the housing | Gas cooling and liquefaction | Dust contamination, clogging |
As can be seen from the table, the discharge tube is only one of the elements of the chain. However, it is she who takes the first blow of high pressure and temperature. In systems with an inverter compressor the load on this area can change more smoothly, but the requirements for soldering quality remain high.
Problems with patency and blockages
One One of the common causes of malfunction of the refrigerator is not only physical damage to the tube, but also a change in its internal patency. Although the discharge tube itself has a sufficient diameter so as not to become clogged with oil breakdown products, problems can arise at the joints or if moisture gets into the system.
If there is moisture in the circuit and low temperatures, an ice plug may form. However, more often, blockages are localized in the capillary tube or filter drier, which are located further along the circuit. However, if the compressor worked with metal shavings (due to wear), these shavings can settle in the discharge line, creating resistance to the freon flow.
To diagnose blockages, technicians use a pressure gauge station. They measure the pressure at the inlet and outlet of the compressor. If the discharge pressure is abnormally high and the motor current consumption is normal or increased, this may indicate an obstruction in the condenser or the initial sections of the discharge line.
- 🛠️ High discharge pressure often indicates a blockage in the condenser.
- 🛠️ Low pressure with the compressor running indicates leakage or valve malfunction.
- 🛠️ Normal pressure, but lack of cold is a sign of a blockage in the capillary.
It is impossible to clean the system yourself without a vacuum cleaner and nitrogen. Attempts to blow through the tube with your mouth or a spray can will only lead to moisture entering and the final failure of the system.
Repair and replacement of damaged areas
If a visual inspection has confirmed that the discharge tube is damaged (crack, through corrosion), professional repairs are required. The process involves several stages: searching for leaks, cutting off the damaged area, soldering a new insert or replacing the entire tube, evacuation and refilling with freon.
In some cases, when the tube is damaged at the very base of the compressor, it may be necessary to replace the motor itself or complex re-soldering of the fittings. For models Electrolux and Whirlpool special adapters are often used, since the diameters of the tubes may differ from standard ones.
☑️ Actions when a leak is detected
The cost of repairs consists not only of the price of materials (copper tube, solder, freon), but also of the difficulty of access. If the capacitor is foamed, the technician will either have to carefully open the insulation or install an external condenser (a “crying” radiator) on the back wall, which is a common practice.
⚠️ Attention: The use of R134a or R600a (isobutane) freons requires strict adherence to safety precautions. Isobutane is explosive when concentrated in air, so work with it should be carried out in a ventilated area away from spark sources.
Prevention and care of the cooling system
Although the discharge tube is hidden from view, its life can be extended by proper handling of the refrigerator as a whole. The main rule is to avoid mechanical damage to the back wall. When cleaning or rearranging the refrigerator, be extremely careful.
It is also important to ensure that the compressor compartment is well ventilated. If dust, animal hair and fluff accumulate at the back of the refrigerator, the heat output of the condenser will deteriorate. This leads to an increase in pressure in the discharge line and overheating of the compressor, which reduces the life of the entire system.
Regularly, at least once a year, move the refrigerator aside and vacuum the rear grille and the space around the motor. This is a simple procedure that significantly reduces the load on refrigeration circuit. In models with a bottom-mounted compressor (behind the decorative panel at the bottom), it is also necessary to monitor the cleanliness of this area.
Often asked questions (FAQ)
Is it possible to replace the discharge tube yourself without special equipment?
No, it is impossible. To repair a sealed circuit, you need a vacuum pump to remove air and moisture, as well as a freon charging station with scales. Without this, the system will not work, and the compressor will quickly fail.
Why is the discharge tube cold, although the refrigerator is humming?
This may indicate several problems: lack of freon in the system (leakage), broken valves inside the compressor (it hums, but does not pump) or a complete blockage of the system. Diagnostics by a technician is required.
What is the difference between a discharge tube and a suction tube?
The discharge tube comes out of the top of the compressor and supplies hot gas under high pressure to the condenser. The suction tube (usually larger in diameter and insulated) delivers cold gas from the evaporator back to the compressor for compression.
How can you tell if the tube has burst?
Most often, this is indicated by hissing (if there is still gas), the smell of oil, or visible oil stains at the rupture site. Also, the refrigerator stops freezing, and the compressor can work without stopping.