Compressor failure is one of the most serious and expensive problems that the owner of household appliances may encounter. It is this unit that is the “heart” of the cooling system, creating the necessary pressure for the circulation of the refrigerant. When the refrigerator stops freezing, hums or operates jerkily, the question of which compressor to put on the refrigerator becomes critical to restoring the functionality of the unit.
The wrong choice of motor can lead to rapid re-failure of not only the compressor itself, but also the entire refrigeration system. An error in power, refrigerant type, or starting device can destroy the condenser or cause a freon leak. Therefore, before purchasing, you need to carefully study the labeling of the old unit and understand the principles of compatibility of different models.
In this article we will analyze the main types of compressors, the algorithm for selecting analogues and technical nuances that beginners often ignore. You will learn why you can’t rely only on the appearance of the part and how to avoid common mistakes when doing your own repairs.
Types of compressors: what’s inside your refrigerator
Before looking for a replacement, you need to determine what type of motor is installed in your refrigerator. In modern and classic household appliances, sealed compressors are most often found. They work on the principle of a reciprocating piston that compresses the refrigerant. This is a time-tested design, but it has its own characteristics in terms of noise and vibration. piston hermetic compressors. They work on the principle of a reciprocating piston that compresses the refrigerant. This is a time-tested design, but it has its own characteristics in terms of noise and vibration.
The second common type is rotary compressors. In them, gas compression occurs due to the rotation of the rotor. Such models are often found in the latest generations of No Frost refrigerators and are characterized by lower noise levels and higher energy efficiency. However, their replacement requires a more highly qualified technician due to the complexity of the design.
⚠️ Attention: An attempt to install a rotary compressor instead of a piston one (or vice versa) without changing the entire piping circuit and starting equipment will lead to instant failure of the system. The type of engine must strictly correspond to the design of the refrigerator.
It is also worth mentioning inverter models that smoothly regulate power without turning off completely. They require a special electronic control module. Replacing a conventional compressor with an inverter one is impossible without completely reworking the electrical circuit of the refrigerator.
Selection criteria: power, refrigerant and refrigerant
The most important parameter when selecting is power (or cooling capacity) of the compressor. It is measured in watts or kilojoules per hour. If you install a motor of less power, the refrigerator will work without interruption, trying to gain temperature, which will lead to overheating of the windings. A unit that is too powerful will cause frequent switching on and off, which is also harmful.
The second critical factor is the type of unit used refrigerant. In older models it was used R-12, in newer ones - R-134a, and in modern environmentally friendly versions - R-600a (isobutane). Compressors designed for one type of freon may have different internal oils and design features. For example, R-600a requires motors with special spark safety due to the explosiveness of the gas.
Pay attention to the supply voltage and current frequency. For Russian networks these are standard 220-230V / 50Hz. However, when ordering spare parts from abroad (for example, from Chinese marketplaces), you can accidentally buy a version on 110V / 60Hz. Such a compressor will either burn out immediately or will operate with overheating and low performance.
Conformity table and interchangeability of brands
Many compressor manufacturers are subcontractors for well-known refrigerator brands. For example, in the refrigerator Indesit there may be a motor Aspera, and in LG — Embraco. Understanding this fact expands your search capabilities. You can often find an original analogue that is technically identical, but costs less.
Below is a table that helps you navigate the main manufacturers and their features. This is not an exhaustive list, but it covers 80% of the market.
| Compressor brand | Country/Holding | Features | Compatibility |
|---|---|---|---|
| Secop (Danfoss) | Germany/Denmark | High reliability, quiet operation | Universal, often replaced |
| Embraco | Brazil/USA | High performance | Widely used in Indesit, Ariston |
| Aspera | Italy | Budget segment, reliability | Frequent choice for older models |
| LG | Korea | Specific fastenings | Mainly for LG and GoldStar |
| Panasonic | Japan/China | Compact sizes | Often found in two-compressor models |
When selecting an analogue, pay attention to the geometry of the mounts (legs). The distance between the holes and their diameter must match, otherwise you will have to make adapter plates, which increases vibration.
Step-by-step instructions: how to replace a compressor with your own hands
Replacing a compressor is a complex technical process that requires special tools. You will need: a pipe cutter, a rolling machine, a burner (gas or oxygen), a vacuum pump and a pressure gauge station. Without vacuuming the system, the refrigerator will not work for a long time.
First you need to completely drain the old freon. To do this, cut through the thinnest tube (filling tube) or pierce the valve. Then they dismantle the old motor by cutting off the copper tubes by soldering or cutting them. It is important not to damage the condenser and other elements of the system during dismantling.
⚠️ Attention: Before soldering new tubes, be sure to blow the system with nitrogen or dry air under pressure to remove moisture and residual old oil. Moisture in the system is the main reason for the formation of ice plugs.
Installing a new compressor requires precise soldering. Use silver solder for a secure connection. After assembling the circuit, vacuum is performed for 15-20 minutes to remove air and moisture. Only after this can the system be filled with freon in a strictly defined amount (indicated on the nameplate).
☑️ Tools for replacement
Common mistakes during selection and installation
One of the most common mistakes is ignoring the state filter-drier. When replacing a compressor, the filter must be changed 100% of the time. The old filter is already saturated with moisture and debris, and if left, the new motor will quickly fail due to clogged capillary tube.
The second mistake is incorrect filling with oil. New compressors are already filled with the required amount of oil. If you add more by eye, it will lead to water hammer or a sharp drop in performance. If there is not enough oil, the compressor will jam after a few months of operation.
The third problem is bad vibration insulation. The compressor must be mounted on rubber washers or bushings. If you press it with metal bolts directly to the body or frame, the vibration will destroy the solder joints of the tubes and the freon will come out.