How much copper is in a compressor from an old refrigerator: real numbers and facts

The question of the content of precious and non-ferrous metals in household appliances worries many who are faced with the disposal or repair of old units. Motor-compressor is one of the heaviest and most valuable components in the design, and it is often considered as a source non-ferrous scrap. However, the exact amount of copper that can be extracted from such a device is not a constant value, but depends on many technical nuances.

Old Soviet and early post-Soviet refrigerators, such as ZIL, Saratov or Orsk, were equipped with units, the design of which was significantly different from modern analogues. They used more metal in general, and the windings were often made of pure copper rather than aluminum, as is often found in budget technology of the 21st century. Understanding these differences is critical for assessing the cost-effectiveness of disassembly.

In this article we will analyze in detail what affects the final weight of scrap, how to correctly determine the type of metal without damaging equipment, and whether it is worth getting involved with copper extraction at all independently. Pure metal yield can vary widely, and knowledge of these figures will allow you to avoid disappointment when delivering raw materials to collection points.

Design features of old motor-compressors

Units installed in old-style refrigerators were sealed units containing complex mechanical and electrical parts. The main consumer of copper here was electric motorconsisting of a stator and a rotor. Unlike modern models, where engineers fight for every gram of weight, old designs were more massive and “thrifty.”

Inside the case there were also copper tubes connecting various parts of the system, and contact groups. However, the lion's share of the valuable metal is concentrated in the windings. Sealed casing usually made of steel, which is of no interest to non-ferrous metal suppliers, but is the main obstacle to accessing the contents.

⚠️ Attention: The internal structure of the compressor is under pressure and contains oil. It is strictly forbidden to open the housing with an angle grinder or a saw without first bleeding off the freon and oil, since the vapors can be toxic and sparks will cause ignition.

It is important to understand that the term “old model” covers a fairly wide period, from the 1960s to the 1990s. During this time, technologies have changed, and even within the same decade there were different modifications. Winding resistance and their cross-section could differ depending on the power and purpose of the refrigeration chamber.

Factors influencing the amount of copper

Name a single figure for all compressors is impossible, since the final weight is influenced by a number of variables. The first and main factor is unit power. Large-volume refrigerators, two-chamber models or devices with the No Frost system (in later versions) required more powerful motors, therefore, the windings in them were more massive.

The second critical factor is the manufacturer and year of manufacture. Soviet industry often used pure electrical copper, while later models, especially the late 90s, could contain aluminum wire or bimetal. It is difficult to distinguish them visually, but this dramatically affects the weight and price of scrap.

The third aspect is the extraction method. During mechanical cutting, part of the metal is inevitably lost or remains in insulation. Burning technology, often used by illegal collectors, leads to oxidation of copper and loss of up to 15-20% of the mass, turning a valuable resource into low-grade scrap.

It is also worth considering the condition of the metal itself unit. If the compressor has been repaired and rewinded, there may be a wire of a completely unexpected cross-section or composition. Factory equipment Always more predictable and standardized.

The actual weight of copper in different models

Disassembly practice shows that the average content copper in a compressor from an old refrigerator ranges from 100 to 250 grams. This may seem like an unexpectedly small amount for such a heavy device, but you need to remember that the bulk of the mass is steel and cast iron. Copper yield makes up only about 6-10% of the total weight of the motor.

Let's look at specific examples of popular models of the past. Compressors like FG-100 or XK-100, which were installed on ZIL and Saratov refrigerators, contained an average of about 150-180 grams of copper. More powerful units intended for freezers or industrial display cases could contain up to 300 grams, but they were less common.

For clarity, we present data in tabular format reflecting average indicators for various types equipment:

As can be seen from the table, even in the “richest” household models we are talking about fractions of a kilogram. Aluminum windings, which began to be introduced en masse later, reduce this value indicator to almost zero, since the price aluminum is significantly lower.

Copper or aluminum: how to determine the winding material

Before embarking on the labor-intensive disassembly process, you need to make sure that there is copper inside at all. In 90% of cases, copper was used in old Soviet refrigerators, but exceptions are possible. The easiest method of initial diagnosis is a visual inspection of the contacts.

If it is possible to remove the protective plastic casing or look into the technological hole, pay attention to the color of the wire. Copper wire has a characteristic reddish-red tint, especially on the cut. Aluminum is always silver-gray. However, oxidation can hide the true color, so rely on a cut or abraded area.

There is also a magnet test, although this is less useful for distinguishing between metals since neither copper nor aluminum is magnetic. But this method helps to find the steel base in bimetallic wires. Heating It can also tell you: copper conducts current better and heats up less under the same load, but it is impossible to check this on a delivered unit.

⚠️ Attention: Do not try to drill the housing of a working or recently operating compressor. Pressure may remain inside, and oil vapors, when heated from drilling, form acrid smoke.

If in doubt, it is better to weigh the risks. Disassembly for 100 grams of aluminum, which will be accepted as black scrap or at a large discount, will not repay the time and tools spent. Density of metals is different, and a copper engine will be noticeably heavier than an aluminum analogue of the same power.

Technology for extracting and cutting the compressor

The process of extracting non-ferrous metal from a compressor requires a serious approach and compliance with safety precautions. The first step is always removing the refrigerant oil. To do this, in the lower part of the housing, at the lowest point, a hole is carefully punched or drilled, draining the technical oil into a special container.

Next follows the most labor-intensive stage - opening the steel casing. Using an open fire (fire, gas burner) to burn out insulation is strictly not recommended if you want to get high-quality copper. When varnish insulation and plastic elements burn, copper oxidizes, becoming covered with scale, which reduces its weight and cost.

The most gentle method is mechanical separation. The stator (a set of metal plates with a winding) is removed entirely. Then, using a powerful vice or hydraulic press, squeeze the copper winding out of the grooves. This allows you to keep the wire intact and avoid oxidation. Manual winding Often it sits firmly in the grooves, and effort cannot be done.

The remaining “iron pancake” (core) is sold as ferrous scrap, and the cleaned copper is sorted. It is important to remove all non-metallic inclusions: varnish residues, cambrics, solder. Cleanliness of scrap directly affects the price offered by the receiver.

Economic feasibility and disposal

Is the game worth the candle? Let's do the math. Let's say you extract 180 grams of copper from a compressor. Even at a high price for non-ferrous scrap, the proceeds will be mere pennies, which will barely cover the cost of electricity for the grinder and the depreciation of the tool. Economic sense appears only when processing tens or hundreds of pieces of equipment.

In addition, we must not forget about the environmental aspect. Compressor oil and refrigerant residues are hazardous waste. Their discharge into the sewer or soil is prohibited by law and harms the environment. Disposal must be carried out through specialized organizations.

If your goal is simply to free up space in the garage, it is much more reasonable to hand over the entire refrigerator to a specialized collection point for household appliances. There, professionals will disassemble the unit themselves, observing all environmental standards, and you may even receive a small compensation for the weight of the ferrous metal.

However, if you are doing repairs and you have accumulated a mountain burnt out motors, their accumulation and periodic delivery in bulk can be a small but pleasant bonus to the main income. Cumulative effect works best in this case.

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