Removing an old or faulty compressor from a refrigerator is often the first step towards its disposal or recycling. Many craftsmen and scrap metal collectors are interested in how to properly and safely open the sealed housing of the unit in order to remove valuable non-ferrous metal. This process requires not only physical effort, but also strict adherence to safety precautions, since refrigerant and compressor oil residues may remain inside the system.
In this article we will analyze in detail the stages of preparation, the necessary tools and the technology for cutting the compressor itself. You will find out how much copper can actually be obtained from one piece of equipment, and whether the game is worth the candle. We will also touch on the legal and environmental aspects of recycling freon, which is strictly prohibited from being released into the atmosphere.
Before starting physical work, you need to make sure that the refrigerator is completely disconnected from the power supply. Condenser the start relay can retain a residual charge, so working with electrical components requires caution. Next, you should drain the technical oil, which is waste and requires special disposal, and not drained into the sewer.
Evaluation of the contents: how much copper is in the compressor
Many people mistakenly believe that the refrigerator compressor consists mainly of copper. In fact, the lion's share of the weight is taken steel body and the core of the electric motor. Copper is used here for the stator windings, which are located inside a sealed casing. Depending on the model and year of manufacture, the yield of pure copper may vary.
The average weight of a household compressor is from 8 to 12 kilograms. From this volume of pure non-ferrous metal that can be extracted after cutting, very little is obtained. Typically this ranges from 0.5 to 1.2 kg, which is approximately 10% of the total weight of the unit. The rest is steel, cast iron and aluminum tubes.
It is important to understand that The maximum copper yield is observed in old Soviet modelswhere they did not skimp on winding materials. Modern units, especially inverter-type units, may contain less copper due to optimization of production processes and the use of aluminum in some components. Therefore, before starting work, it makes sense to weigh the “output” and estimate the profitability of the process.
Necessary tools and safety measures
The process of disassembling a compressor for copper is impossible without specialized tools. A regular hacksaw for metal is not enough here, since the body is made of thick steel. For efficient and fast work, you will need an angle grinder, popularly called an “grinder”, with metal discs with a thickness of at least 1 mm.
⚠️ Attention: When working with an angle grinder, be sure to use safety glasses and gloves. Sparks can fly up to several meters, and disk fragments pose a serious danger to the eyes.
In addition to power tools, you will need a set of plumbing supplies. A hammer, chisel or powerful chisel will help bend the metal after the cuts. Also, do not forget to prepare a container for draining the oil and rags for wiping your hands and tools. It is best to work outdoors or in a well-ventilated area with a concrete floor.
- 🛠️ Angle grinder (grinder) with spare discs.
- 🔨 Heavy hammer and chisel for opening the casing.
- 🧤 Dense work gloves and safety glasses.
- 🗑️ Sealed container for used oil.
- 🌬️ Respirator for protection against metal dust.
Pay special attention to respiratory protection. When cutting metal and burning insulation (if you plan this method), harmful dust and smoke are generated. Respirator a protection class of at least FFP2 will become a reliable barrier for your lungs. Ignoring this point can lead to serious illnesses in the future.
Preparing the compressor for opening
The first stage of preparation is to remove the compressor from the refrigerator, if it has not already been removed. It is necessary to cut through the copper tubes suitable for the unit with wire cutters and unscrew the mounting bolts. After this, the compressor must be thoroughly cleaned of external contaminants.
The next critical step is to remove the refrigerant. In older models, freon could evaporate on its own over years of inactivity, but in newer units the pressure in the system is maintained. Puncture the housing or cutting pipes under pressure can lead to a sudden release of gas. Although modern freons are not toxic in small doses, they displace oxygen and can cause suffocation in a confined space.
After bleeding the gas, drain the oil. To do this, the compressor is turned over and a hole with a diameter of 3-5 mm is drilled in the lower part. The oil has a specific smell and dark color. Collect it in a container, since draining the oil into the soil or sewer is prohibited by environmental regulations. After the oil has completely drained, the hole can be temporarily plugged with a rag or a wooden plug.
Technology for cutting the case and removing the windings
The most labor-intensive stage is the direct opening of the steel case. The hermetic casing consists of two hemispheres welded together along the equator. Your task is to make a circular cut exactly along this weld. Hold the grinder confidently, controlling the depth of the cut so as not to damage the internal stator winding.
After the circular cut is made, it is necessary to remove the top “cover” of the compressor. Often the metal can hold welds at several points or simply jam. Gently tap the perimeter of the seam with a hammer, using a chisel to wedge the joint. Do not apply excessive force so as not to deform the internal stator with copper coils.
When the housing is opened, you will see an electric motor immersed in an oil bath (residues of oil may be inside). The copper-wound stator is usually attached to a housing or internal bulkhead. In some models you need to knock it out, in others you need to unscrew the central bolt. Be prepared for the fact that there will be a lot of technical oil inside.
☑️ Safe cutting checklist
Separation of copper and steel: processing methods
After removing the stator from the housing, you are faced with the task of separating the copper wire from the metal set of plates (laminated core). There are several ways to do this, each with their own pros and cons. The choice of method depends on the available equipment and the requirements for the purity of the resulting metal.
The first and most common method is mechanical. Using a hacksaw or the same grinder, two longitudinal cuts are made along the edges of the core. This allows the coils to be released, which are then simply removed. The wire remains insulated, which reduces its cost upon delivery, but does not require additional energy costs.
The second method is thermal (firing). Copper windings are heated with an open fire (fire, burner) until red hot. The insulation (varnish, enamel) burns away, leaving clean, shiny copper. This method gives a higher price upon delivery, but is extremely harmful to the environment due to toxic smoke from burning insulation.
| Method | Purity of copper | Time consumption | Harm to the environment |
|---|---|---|---|
| Mechanical | Low (in isolation) | Average | Minimum |
| Thermal | High (shine) | High | Critical |
| Chemical | Average | Low | High (acids) |
The third option is the use of chemical solvents, but it is difficult in domestic conditions and requires working with aggressive acids, which is dangerous to health. Most craftsmen choose the mechanical method or combine it with light heating with a gas torch to remove the bulk of the varnish without allowing the process to completely burn out.
Waste disposal and environmental responsibility
After successfully extracting copper, you will be left with a significant amount of waste: a steel body, cast iron parts, oil residues and, possibly, burnt insulation. You can't just throw it in a regular trash container. Scrap metal should be taken to ferrous metal collection points, where they can also pay a small amount for it.
⚠️ Attention: Used compressor oil is classified as hazardous waste. It is strictly forbidden to pour it onto the ground, into water bodies or sewers. Hand it over to special collection points or service stations.
Refrigerant recycling plays a special role. If you released freon into the atmosphere, you formally violated environmental standards. On an industrial scale, refrigerants are pumped out by special stations and destroyed or regenerated. It is difficult to do this in a domestic environment, but try to at least minimize the emission by venting the gas through a hose into the hood or outside, away from windows.
What to do with insulation from wires?
Burnt insulation (carbon deposits) must be collected and disposed of as solid household waste. Burning insulation in the open air without filters releases dioxins - persistent organic pollutants that are dangerous to humans and nature.
Compliance with recycling rules makes the process not only profitable, but also socially responsible. The metal will be melted down, the oil will be neutralized, and harmful substances will not get into the soil of your yard. This turns the “dirty” business of dismantling into a civilized processing of resources.
Frequently asked questions (FAQ)
How much does copper from one compressor cost in terms of money?
The cost depends on the current prices at collection points and the weight of the extracted metal. On average, about 0.8 kg of copper comes out of one compressor. If the price of copper is approximately 600-700 rubles per kg, then the “yield” will be about 500 rubles. However, from this amount you need to subtract the cost of depreciation of discs for the grinder and electricity.
Is it possible to hand over the entire compressor without disassembling it?
Yes, many scrap metal collection points accept entire compressors as “mix” or “heavy copper” (depending on the rules of the point). However, the price per kilogram in this case will be significantly lower than for pure cut copper. Disassembly makes sense if you have several pieces of equipment or you want to get maximum profit.
Is it dangerous to open the compressor if there is freon left in it?
Yes, it is dangerous. Although freon is not poisonous, it is under pressure. A sudden release may damage the eyes or cause frostbite on the skin if it comes into contact with the gas stream. In addition, freon is heavier than air and can displace oxygen in a poorly ventilated area, creating a risk of suffocation.
Which disk is best to use for an angle grinder?
For cutting the compressor housing, metal disks with a thickness of 1.0–1.2 mm are best suited. Thin disks (0.8 mm) wear down faster and can burst under lateral load, while thick ones (2.5 mm or more) make too wide a cut, wasting metal and increasing operating time.
To summarize, we can say that disassembling a refrigerator compressor for copper is a completely solvable task for a person with minimal technical skills. The main thing is not to neglect personal protective equipment and take a responsible approach to the disposal of associated waste. Remember that the health and cleanliness of the environment are more important than a couple of kilograms of non-ferrous metal.