Refrigerators Liebherr have long established themselves as the standard of reliability in the household appliances segment, and This is largely due to their “heart” - the compressor unit. The stability of the temperature regime, the noise level and the durability of the entire device depend on the quality of this unit. Many owners wonder what exactly is hidden behind the metal casing and why the German brand is so sensitive to the choice of suppliers.
Unlike many competitors, who often change suppliers in order to save money, the company Liebherr has maintained partnerships with trusted manufacturers for decades. This allows engineers to accurately calibrate control systems to specific engine characteristics. Compressor In these refrigerators, it is not just a pump for refrigerant, but a complex system that works in tandem with electronics.
Understanding what type of engine is installed in your model is critical when diagnosing problems. If you hear an unusual hum or notice that the equipment has stopped freezing, knowing the brand and type of unit will help the technician quickly select spare parts. In this article we will analyze in detail which units are used in different series and how they differ from each other.
Main suppliers of compressor units
Historically, the main and almost the only supplier of compressors for refrigerators Liebherr is an Austrian company Secop (previously known as the compressor division Danfoss). This cooperation has been going on for many years, and during this time the engineers of the two companies have developed many unique modifications. That is why, when you open the back panel of the refrigerator, you will most likely see a sticker with a logo Secop or Danfoss.
However, in the latest models, especially built-in series and lines BioFresh, you can find units from other manufacturers that meet the strict specifications of the brand. Among them there are products from Embraco (now part of Nidec Global Appliance) and the Chinese giant GMCC (owned by Midea). It is important to understand that even if the compressor is made in China, it undergoes the strictest quality control according to German standards.
⚠️ Attention: When ordering spare parts for repairs, do not rely only on the refrigerator logo. Always check the compressor model number indicated on the nameplate of the unit itself, as the visual similarity of housings from different manufacturers can be misleading.
The variety of suppliers is due to logistics and specific size and power requirements for different product lines. For example, compact models require miniature engines, which not all factories can produce. Technological map Assembly involves using only those components that have passed tests for vibration resistance and energy efficiency.
Technologies: Inverter vs. Piston models
Modern model range Liebherr can be clearly divided by compressor drive type. Traditional piston units, operating on the “on-off” principle, are gradually becoming a thing of the past, giving way to more advanced systems. However, in many budget and mid-budget series you can still find classic piston compressorss. They are characterized by a simple design and high maintainability.
Flagship series, such as Liebherr Premium or BluPerformance, are equipped with inverter motors. Their main difference is the ability to smoothly change the shaft rotation speed depending on the thermal load. This allows you to achieve energy consumption class A++ i A+++. The inverter compressor does not stop completely, but only slows down, maintaining the temperature in a narrow range.
- 🔹 Inverter compressors models they work much quieter, since constant starting currents and relay clicks are eliminated.
- 🔹 Piston units are more sensitive to voltage drops in the network, but are easier to maintain.
- 🔹 The operating life of modern inverters is declared by the manufacturer to be up to 20 years, which is twice the service life of old models.
The transition to inverter technology has made it possible to implement function SmartDeviceBox, when the refrigerator can switch to economical mode upon a signal from a smartphone. A conventional compressor could not provide such flexibility in power control. Electronics The refrigerator constantly monitors the temperature and adjusts the operation of the motor.
Why is an inverter more expensive to repair?
Inverter compressors have a more complex control board design, built-in directly into the housing or placed in a separate block. Replacing such a unit requires not only mechanical skills, but also the ability to work with electronics, which increases the cost of the work. In addition, the units themselves are much more expensive than their analogues.
Model range and specification of engines
To accurately identify the compressor, you need to know the markings. In refrigerators Liebherr most often there are series of engines BD, TL and NL from the manufacturer Secop. Each series has its own characteristics in terms of cooling capacity and the type of refrigerant used. Previously, it was widely used R134a, but new models are switching to more environmentally friendly R600a (isobutane).
Below is a table showing the correspondence between the series of refrigerators and the types of compressors used. Please note that the same model in different years of production could have different units.
| Liebherr refrigerator series | Compressor type | Manufacturer | Refrigerant |
|---|---|---|---|
| CN, CTP, CU (Basic) | Piston, static | Secop / Danfoss | R134a / R600a |
| CBN, ICBN (BioFresh) | Inverter, quiet | Secop | R600a |
| SBS (Side-by-Side) | Two compressors (inverter + start-stop) | Secop / Embraco | R600a |
| WK (Wine coolers) | Specialized low noise | Secop | R600a |
Two-compressor models, such as Side-by-Side, often use a combination of two different engines: one powerful for the freezer compartment and one less powerful for the refrigerator compartment. This allows you to independently control the temperature in each circuit. Efficiency such a system is higher than that of one large compressor with a flow separation system.
Operating life and wear factors
The declared service life of compressors Liebherr is from 10 to 20 years, depending on the intensity of use. However, the actual figure often depends on the conditions in which the equipment is located. The main enemy of any motor is overheating. If the refrigerator is located close to the wall or in a niche without proper ventilation, condensation temperature it grows, forcing the unit to work at its limit.
Frequent power outages also negatively affect the resource. Each start-up after inactivity occurs with maximum load, since the pressure in the system has not yet equalized. Modern models have anti-restart protection installed, which delays the start for several minutes, but older piston models may not have such protection.
- 🔸 Dust on the condenser (black grille at the back) impairs heat transfer, increasing the load on the compressor.
- 🔸 Filling the freezer with ice causes the engine to work longer to maintain temperature.
- 🔸 Using unstable voltage in a network without a stabilizer can lead to winding burnout.
Symptoms of compressor wear are not only the absence of cold, but also a change in the nature of the sound. The appearance of a metallic clanging, humming or too frequent on-off cycles indicates that the resource of the node is coming to an end. Diagnostics at an early stage it can save products and budget.
⚠️ Attention: If the compressor is hot to the touch (burns your hand) and the refrigerator does not freeze, immediately unplug the appliance. Operation in this mode can lead to a fire or complete destruction of the motor.
Features of replacement and repair
Replacing a compressor in a refrigerator Liebherr is a complex technological process that cannot be performed at home without special equipment. Requires a vacuum pump, pressure gauge station, burner and skills in working with copper pipes. An independent attempt to replace it often leads to the system becoming clogged with combustion products or moisture remaining.
When repairing, it is important to use a compressor with exactly the same characteristics as the original. This applies not only to geometric dimensions, but also to performance (in W or kcal/h), type of oil and required refrigerant. Installing a more powerful engine “by eye” will lead to the fact that the system will not have time to give off heat, and the refrigerator will not work correctly.
☑️ Check before calling a technician
The cost of the original compressor Liebherr can be high, so often craftsmen offer high-quality analogues from Secop the same series. This is acceptable practice if the parameters match exactly. However, for models with a system NoFrost and electronic control, it is important that the compressor power meets the requirements of the controller.
Warranty and service
The company Liebherr provides an extended warranty for the compressor - up to 10 years in some regions, subject to product registration. However, the warranty only covers manufacturing defects and does not cover wear and tear resulting from misuse. To take advantage of warranty service, you must keep receipts and purchase documents.
Official service centers have access to a database where, using the serial number of the refrigerator, you can accurately determine which compressor should be installed. This eliminates errors when selecting spare parts. If you contact a private workshop, request a receipt for a new compressor indicating its model and warranty.
Regular maintenance, including cleaning the condenser from dust and checking the seals, extends the life of the compressor. Prevention is much cheaper than a major overhaul of the refrigeration unit.
Is it possible to replace a Secop compressor with an analogue from another brand?
Theoretically, it is possible if the mounting dimensions, power and type of refrigerant are the same. However, Liebherr electronics can be tuned to the specific starting currents and operating characteristics of a particular motor. Installing a non-original compressor can lead to errors in the operation of the electronics or reduce the service life of the new unit.
Why does a new compressor hum after replacement?
The hum can be caused by several reasons: improper installation (tubes touching the housing or wall), lack or excess of refrigerant, or the presence of air in the system. Also, the new compressor may work louder during the “break-in” period, but if the noise does not subside after a few days, diagnostics are required.
How to find out the model of the compressor without opening the casing?
The exact model can only be recognized by the sticker on the compressor itself, which is located at the bottom of the refrigerator. In some cases, information can be found in the technical documentation for the refrigerator or according to the service code of the model on the manufacturer’s website, but a 100% guarantee is provided only by a visual inspection of the unit’s nameplate.
Is loud operation a sign of a breakdown?
Not always. A loud knocking or clicking noise when turning on/off is normal for piston models. However, a constant loud hum, vibration or clanging may indicate wear of the bearings, destruction of the motor mount or problems with the cooling system.