The question of the content of precious and non-ferrous metals in old household appliances often comes up when recycling or handing over equipment to recycling collection points. Owners of rare models, such as ZIL, Saratov or Donbass, are trying to understand whether it is worth spending time on dismantling in order to obtain copper scrap. Soviet compressors were famous for their reliability and the use of high-quality materials, which made them attractive to processors.
However, in order to get an accurate answer, it is necessary to take into account many technical nuances, starting from the year of manufacture of the unit and ending with the specific model motor-compressor. Weight of copper varies depending on the power of the electric motor and the design features of the stator windings. In this article, we will analyze in detail how much non-ferrous metal can be extracted from old units and how to correctly estimate their value.
It is worth noting right away that the exact amount of material can only be found out after weighing on a scale, since even within the same series there may be discrepancies. However, there are average data that allow us to form a general idea of the value of the contents of the compressor.
Design features of Soviet compressors
Soviet industry produced refrigeration units with a long service life in mind, often at the expense of energy efficiency and noise levels. The main element of the system is piston compressorenclosed in a sealed steel casing. Inside this casing there is an electric motor, the rotor of which drives the crank mechanism.
It is in the electric motor that the bulk of the non-ferrous metal is concentrated. The stator windings were made of copper wire, insulated with varnish or special fabric materials. Unlike modern analogues, where aluminum or its alloys are often used, in the USSR the standard was precisely electrolytic copper high purity.
The compressor housing is also of interest, but from the point of view of ferrous scrap. The thickness of steel in older models HKV or FKV significantly exceeds modern standards. However, for copper extraction we are interested in the internal “filling”, access to which requires breaking the seal of the housing.
⚠️ Attention: Opening the sealed compressor casing is strictly prohibited if you plan to use it for its intended purpose. After cutting the housing, the unit becomes unsuitable for operation in the refrigeration circuit due to the impossibility of restoring vacuum and factory sealing without special equipment.How much copper is in different models: table and calculations
The weight of the copper winding directly depends on the engine power, which, in turn, correlates with the volume of the refrigerator compartment. Single-compressor low-power models contain less metal than two-chamber giants. Also, the amount of copper varies depending on the engine series.
The most common models in everyday life were the series HC (Refrigeration Compressor) and FK (Freon Compressor). In more powerful industrial or semi-industrial designs, the weight of the windings could reach one and a half kilograms, but in household appliances the figures are more modest.
Below is a table with average data on the copper content in popular Soviet compressors. These data are relevant for serviceable engines, where the windings were not rewound with aluminum during a makeshift repair.
Compressor model Years of manufacture Power (W) Weight of copper (kg) KhKV-5.55 1960–1975 110–120 0,15 – 0,20 FKV-5.55 1970–1985 140–160 0,25 – 0,30 KhKV-12.5 1980–1990 200–220 0,35 – 0,45 BK-1.4 (Biryusa) 1985–1995 180–200 0,30 – 0,40 As can be seen from the table, the maximum copper yield is less than half a kilogram per unit. It should be taken into account that total weight of the compressor together with oil, steel casing and mechanical parts is from 9 to 12 kilograms.
📊 For what purpose are you looking for information about copper in the compressor?Send it to scrap metalDIY RepairJust for curiosity's sakeFor educational workTechnology for extracting non-ferrous metal
The process of extracting copper from a compressor is labor-intensive and requires compliance with safety measures. Simply breaking the housing with a sledgehammer is ineffective and dangerous, since there may be compressed refrigerant and oil inside. Professionals use angle grinders (“grinders”) to carefully cut the upper part of the casing.
After opening the casing, it is necessary to drain the compressor oil and disconnect the copper tubes of the condenser and evaporator, if they remain attached. The main mass of copper is the stator winding. To remove it, it is often necessary to drill or cut off the end part of the stator plate package.
- 🔨 Preparation: drain the oil, cut off the upper housing cover with a grinder, being careful.
- 🔌 Dismantling: disconnect the wires, remove the terminal box, remove the electric motor from casing.
- 🔥 Cleaning: remove insulation, varnish and plastic elements from the windings (often by burning or chemically).
- ⚖️ Sorting: separate pure copper from the steel core plates and aluminum details.
It is important to understand that at the output you will receive not only copper, but also a mixture of waste that also requires disposal. Compressor oil is hazardous waste (hazardous waste) and requires special disposal; it cannot be discharged into the sewer or onto the ground.
☑️ Safety checklist for disassembly
Completed: 0 / 4Economic feasibility of disassembly
Before starting disassembly, It's worth doing some simple math. The cost of copper scrap fluctuates, but even at high prices, the output from one compressor rarely exceeds the cost of several breakfasts. The bulk of the weight falls on ferrous metal (steel), the price of which is much lower.
If we consider the old refrigerator as a whole, then the main value is not the compressor, but the copper coil (condenser and evaporator), located on the back wall or inside the cabinet. In Soviet models ZIL or Saratov these elements are also made of copper, unlike modern aluminum analogues.
⚠️ Attention: Prices for non-ferrous metals are unstable and depend on stock quotes. Before you start mass recycling of equipment, check the current prices at the collection points in your region, as conditions may change daily.In addition, it is necessary to take into account the depreciation of the tool (discs for an angle grinder, electricity) and the time spent. It is often more profitable to hand over the entire refrigerator as household scrap or sell it as used equipment if it is in working condition.
The hidden value of Soviet refrigerators
In some rare models of Soviet refrigerators, especially early years of production, not only windings and tubes could be copper, but also fastening elements, bushings and even parts of the internal mechanism of the compressor. However, this was found on a large scale only in technology until the 1970s.
The influence of the year of production on the copper content
The chronology of production plays a key role. Between 1950 and 1970, copper was the standard. Engineers of that time did not strive to save material at the expense of reliability, so the windings were massive, with a thick layer of insulation.
Starting in the 1980s, and especially during the period of perestroika and the 90s, manufacturers began to look for ways to reduce costs. Motors with reduced copper content or the use of copper-plated aluminum (bimetallic wire) appeared. It is difficult to visually distinguish such a wire, but this has a significant effect on weight and conductivity.
When assessing the potential metal yield, rely on the engine markings. If the nameplate shows a year of manufacture later than 1985, the likelihood of having clean copper wire is reduced. In later models Donbass or Oka compromise technical solutions could already be used.
Environmental aspects and disposal
Independent recycling of equipment carries environmental risks. When insulation from copper wires (varnish, rubber) is burned, toxic substances, including dioxins, are released into the atmosphere. This is harmful to the environment and human health.
In addition, the refrigerants used in Soviet refrigerators (freon R12) are substances that destroy the ozone layer. When the system depressurizes, they enter the atmosphere. Modern recycling involves the mandatory collection and neutralization of freon.
Therefore, if your goal is not repair, but rather obtaining metal, the most reasonable step would be to hand over the equipment to specialized recycling centers. There, the equipment will be dismantled in compliance with environmental standards, and you will receive payment for the entire weight of the scrap, albeit at wholesale prices.
Frequently asked questions (FAQ)
Is it possible to determine the presence of copper without opening the compressor?
It is impossible to accurately determine the weight of copper without opening it. However, one can indirectly judge by the weight of the entire unit and the year of manufacture. Heavy compressors manufactured before 1980 have a 90% probability of containing copper windings. You can also check the resistance of the windings with a tester - for copper it is lower than for aluminum, but for an accurate comparison you need a standard.
How much does it cost to hand over the entire compressor without disassembling it?
The price depends on the collection point. Typically, compressors are accepted as a “mix” (a mixture of ferrous and non-ferrous scrap) or at the price of ferrous scrap, since the percentage of copper yield is unknown. The average price is significantly lower than for purified copper, but higher than for ordinary steel.
Are there other non-ferrous metals in Soviet refrigerators?
Yes, in addition to copper in windings and tubes, in older models you can find brass (in valves and fittings), aluminum (in some evaporators of later models) and zinc. The electrical part (relays, thermostats) also contains a small amount of silver in the contacts, but extracting it at home is unprofitable.
Is it dangerous to open an old compressor?
Yes, it is dangerous. High gas pressure and oil vapor may remain inside. When working with an angle grinder, sparks are possible, which in combination with oil vapor creates a risk of fire. Be sure to work in a ventilated area and use personal protective equipment.
What is the copper yield as a percentage of the total mass of the compressor?
Copper makes up approximately 3-5% of the total mass of the compressor. The rest is steel (housing, stator plates, shaft, piston), cast iron and oil. Therefore, it is incorrect to say that the compressor “consists of copper.”