The question of the content of precious and non-ferrous metals in household appliances often arises among those who plan to recycle an old unit or are engaged in professional repair. Refrigerator compressor is a sealed unit, inside of which a significant amount of cuprum (copper) is hidden in the windings of the electric motor. However, getting exact numbers is not as easy as it might seem at first glance, because the weight depends on the specific model and year of manufacture of the device.
Many mistakenly believe that the entire weight of a heavy “pot” (as the compressor is called in everyday life) is pure metal, suitable for quick melting. In fact, the lion's share of the mass is occupied steelfrom which the case is made, and copper makes up only a certain percentage. For an accurate calculation, it is necessary to take into account that not only the stator winding is located inside, but also the copper tubes of the heat exchanger, if they have not been dismantled earlier.
In this article we will analyze in detail how much copper can be obtained from one compressor, what factors influence this indicator and why the numbers can differ significantly. You will learn about the technical features of the design and receive practical advice on the safe extraction of non-ferrous metal, which is especially important for those who are engaged collecting recyclable materials.
Design features of the compressor and distribution of metals
To understand where copper comes from, you need to look inside the device. A compressor is a sealed unit consisting of an electric motor and a mechanical compressor group. The main source non-ferrous metal is the stator windings of the electric motor. They create the magnetic field necessary to rotate the rotor. Modern models use predominantly copper wire, although in some budget or very old series aluminum was also found, which significantly reduces the value of the unit.
In addition to the electrical part, copper is actively used in heat exchange circuits. Pipes supplying and discharging refrigerant are often made of this metal due to its excellent thermal conductivity and flexibility. However, when the compressor is delivered "as is", these tubes may already be cut or damaged, which reduces the overall output Cu. It is important to distinguish between the weight of the “pot” itself and the weight of the entire system, which includes the condenser and evaporator.
⚠️ Attention: Inside the compressor there is oil, which can be toxic or contain refrigerant breakdown products. If the seal of the housing is broken (cut or punched), take precautions and do not allow liquid to come into contact with your skin.
The structure of mass distribution in a typical household compressor is heterogeneous. If you take an average unit weighing 10-11 kg, then steel will make up about 85-90% of the mass. The rest is copper, aluminum (in the form of plates or valve group parts) and a small amount of insulating materials. Weight of copper directly depends on the engine power: the more powerful the refrigerator (for example, a two-compressor), the thicker the wire cross-section and the more turns.
Factors influencing amount of copper in the unit
There is no single figure that would be suitable for all refrigerators. The amount of metal recovered varies depending on several key parameters. Firstly, this manufacturer. European and American brands such as Whirlpool, Electrolux or Zanussihave traditionally used more copper in windings compared to some Asian counterparts, where material substitution may have been used at certain times.
Secondly, the year of manufacture plays a critical role. Old Soviet refrigerators (ZIL, Biryusa, Minsk) were famous for their safety factor and a large amount of non-ferrous metals. In them, the windings were made with a large margin, and the tubes were thick-walled. Modern units, created in an era of resource conservation and energy efficiency, can contain less metal for the same performance through changes in design and materials.
The third factor is the type of compressor. Standard reciprocating models contain more copper in the windings compared to inverter linear compressors, which often have a different motor architecture. It is also worth considering that inverter models may have more complex electronic filling, but less traditional winding copper in the “pot” itself.
Average indicators: how much copper can be obtained
The practice of selling equipment for scrap has produced average values that can be used as a guide. If we consider a standard single-compressor refrigerator, then the weight of the compressor unit itself (without tubes and assembled) usually varies from 9 to 12 kg. Of this weight, pure copper winding makes up approximately 10-15%.
For a more precise understanding, we will give specific numbers. From one standard compressor weighing about 10 kg, experienced craftsmen extract from 1.0 to 1.7 kg of pure copper. This value is relevant for a whole, not disassembled motor, where the copper is in the form of windings. If we consider the entire refrigerator, including the condenser grille and evaporator, then the total amount of copper can reach 2-3 kg, but the bulk is concentrated in the motor.
The table below shows indicative data on various types of compressors that will help you form an approximate idea of the metal yield:
| Compressor type | Approximate weight of the unit (kg) | Copper output (winding), kg | Copper output (with tubes), kg |
|---|---|---|---|
| Low power (single chamber) | 8.0 - 9.5 | 0.7 - 1.0 | 1.2 - 1.5 |
| Medium power (standard) | 9.5 - 11.5 | 1.0 - 1.4 | 1.6 - 2.0 |
| Powerful (two-compressor/No Frost) | 11.0 - 13.0 | 1.4 - 1.8 | 2.1 - 2.5 |
| Soviet models (ZIL, Minsk) | 10.0 - 12.0 | 1.5 - 2.0 | 2.5 - 3.0 |
It is worth noting that these data are averaged. Actual weight may vary depending on the specific series and year of production. For example, compressors Danfoss or Secop, popular in European technology, have their own winding standards, which can give a slightly lower or higher metal yield compared to their Chinese counterparts QD or GMCC.
Copper extraction technology and safety measures
The process of extracting copper from a compressor requires certain skills and tools. The simplest, but dirtiest way is to break the body with a sledgehammer. However, it does not allow the winding to be removed carefully and often results in the copper being mixed with the iron, which reduces the scrap price. A more professional approach involves using an angle grinder (grinder) or a reciprocating saw.
First you need to drain the oil. To do this, a hole is drilled in the lower part of the body, at the lowest point. The oil may be dark and have an unpleasant odor, so it is better to carry out the procedure outside or in a well-ventilated area, using a container to collect the waste. After draining the oil, the housing is opened. Usually the upper “cap” of the compressor is cut off along the weld seam.
Inside you will see a stator with wound coils. To extract copper, they often use the method of burning or chemical etching, but at home it is safer and easier to carefully cut out the winding. Copper wire it sits tightly in the grooves of the iron, so it is almost impossible to pull it out entirely without damaging the stator lamellas. Usually it is simply pulled out or cut out together with a part of the iron, and then cleaned.
☑️ Safe disassembly of the compressor
⚠️ Attention: It is strictly forbidden to open the compressor if freon remains under pressure in the system. This may result in eye injury or case rupture. Make sure that the system is completely depressurized and the pressure has equalized.
Economic feasibility and recycling
Is it worth extracting copper yourself? The answer to this question depends on the scale. If you have one old refrigerator, the cost of electricity for an angle grinder, time and effort may not be worth it, given the current prices for non-ferrous scrap metals. Delivering the entire compressor to a collection point is often more profitable in terms of the ratio of time spent and profit received.
However, if we are talking about processing dozens of pieces of equipment, for example, when liquidating a cafe or hotel, then independent cutting becomes profitable. Cleaned copper (burnt or lump) is valued significantly higher than assembled scrap (mixed). In addition, the steel from the compressor housing is also turned into ferrous metal, which provides additional, albeit small, income.
It is important to remember the environmental aspect. Compressor oil and remaining refrigerant must not be poured down the drain or onto the ground. These are petroleum products that cause serious harm to the environment. Recycling must be carried out in compliance with environmental standards, handing over waste to specialized organizations.
Why is the price of copper changing?
The price of copper on the LME exchange (London Metal Exchange) is dependent on global demand driven by the construction, electronics and green energy industries. In addition, the cost is affected by exchange rates and logistics supply chains for ore.
Frequently asked questions (FAQ)
Is it possible to determine the presence of copper by simply knocking on the compressor?
No, the sound of a knock will not provide accurate information about the amount of copper. The sound depends on the thickness of the housing walls and the presence of oil inside. The contents can be determined only by the model marking and reference data or by opening it.
Is there gold or silver in the compressor?
In the compressor unit (motor) itself there are no precious metals on an industrial scale. The relay contacts of the starter protection device may contain silver, but their quantity is measured in grams and is not of interest for mass mining.
What to do if aluminum is found in the winding?
If, when stripping the wire, it turns out that there is silver metal (aluminum) under the varnish, then the cost of such scrap drops sharply. Aluminum windings were found in some models, and they are bought at the price of scrap aluminum, not copper.
Do you need to remove copper tubes before delivery?
Yes, it is better to cut off the tubes going from the compressor to the condenser and hand them over separately as pure copper. When assembled with iron, they can be assessed by receivers as a “mix” or scrap assembly, which is cheaper.
To summarize, we can say that the average refrigerator compressor contains from 1 to 2 kg of valuable copper. This figure varies depending on the power, brand and year of manufacture of the equipment. For an ordinary user who wants to get rid of one old unit, the optimal solution would be to hand over the entire compressor or refrigerator assembly to a specialized collection point, where professionals themselves will deal with the disposal and recycling of the components.