The question about the weight of the compressor often arises in two situations: when planning to remove old equipment for recycling or when independently replacing a failed unit. Refrigeration unit is the heaviest element of the structure, second in weight only to the metal body and thermal insulation. Understanding the exact weight is necessary to calculate the load on the floor during installation and select suitable fasteners.
Many people mistakenly believe that all motors have the same weight, but this is not the case. Weight directly depends on power the device, the type of refrigerant and the volume of injected freon. Modern models strive to reduce weight through the use of aluminum windings and lighter alloys, however, old Soviet units can be significantly heavier than their modern counterparts.
In this article we will analyze in detail what makes up the mass of the engine, how oil affects the overall weight, and we will provide a comparative table for popular manufacturers. This data will help you avoid mistakes when ordering spare parts online or when delivering equipment to non-ferrous metals collection points.
Design and weight characteristics of the compressor
The main mass of the compressor is its sealed metal case, inside of which there is an electromechanical part. Steel casing protects internal mechanisms from damage and prevents leakage refrigerant. It is the thickness of the housing walls and the quality of the steel used that often determine the base weight of the device even before installing the internal components.
Inside the housing there is an electric motor and a compressor part (piston or rotor group). The copper used in the stator windings has a high density, which adds significant weight. Induction motor assembled with the rotor makes up more than 60% of the total mass of the unit. In modern models, manufacturers are increasingly replacing copper with aluminum, which reduces weight, but can affect durability.
⚠️ Attention: Never try to open the sealed compressor housing at home. There may be gas under pressure inside, and oil and freon vapors are toxic. Disassembly is possible only in specialized workshops in compliance with safety regulations.
Also, the total weight is affected by the amount and type of oil poured into the system to lubricate the rubbing parts. Although the volume of oil is relatively small (usually from 200 to 400 grams), its density makes adjustments to the final figures when weighed. The total mass consists of the weight of “iron”, copper and technical fluids.
Factors affecting the mass of the refrigeration motor
The first and most important factor is the power device. Compressors designed for large-volume two-chamber refrigerators are always heavier than models for minibars or single-chamber systems. The difference in power dictates the need to use a more massive stator and a reinforced crank mechanism.
The second factor is the type of refrigerant with which the unit is designed to work. Devices running on R600a (isobutane)often have smaller dimensions and weight compared to models running on R134a. This is due to the fact that isobutane requires less material to create the required pressure, which allows engineers to reduce the size of the cylinders and pistons.
- 🏭 Material windings: Copper coils are significantly heavier than their aluminum counterparts, which is noticeable when lifting the device.
- ⚙️ Design type: Piston models are usually more massive and heavier than inverter or rotor analogues of comparable power.
- 🛢️ Volume oils: Old models require more lubrication, which increases their weight during transportation.
The third factor is the year of manufacture and series of production. Technology changes, and modern engineers strive to optimize weight without sacrificing performance. Therefore, an engine produced 15 years ago can weigh 1-2 kg more than its modern counterpart with the same characteristics.
The weight of the compressor with and without oil: what is the difference
When dismantling equipment or purchasing spare parts, it is important to understand the difference between the “dry” weight and the weight of the device with oil. Technical oil in the compressor it performs the critical function of lubrication and heat removal. On average, a standard household compressor contains from 250 to 400 milliliters of oil.
If you weigh an engine to estimate the cost of non-ferrous scrap, the presence of oil distorts the results. Oil is an organic liquid that is not a non-ferrous metal. During processing, it will still be salted, so an honest assessment is made by the mass of “iron” and copper. However, when purchasing a new or used unit for installation, the oil must be inside.
⚠️ Attention: When transporting the compressor, strictly maintain a vertical position. An inclination of more than 40 degrees can lead to oil flowing from the crankcase to the discharge circuit, which will cause water hammer at the first start.
The difference in weight can be up to 0.5 kg. For accurate calculations, for example, when logistics of a large batch of equipment, this parameter should be taken into account. In everyday conditions, when we are talking about one refrigerator, this difference is insignificant, but technically it exists and affects the total weight of the device.
What will happen if you start the compressor without oil?
Starting a dry compressor will lead to instant overheating of the bearings and jamming of the piston group. The engine will burn out or jam within a few minutes or even seconds of operation.
Comparative table of the weight of compressors of popular brands
For ease of assessment, we provide data on the average weight of compressors that are most often found in household refrigerators. These values are averaged, since the specific mass depends on the modification and year of manufacture unit.
| Brand / Manufacturer | Refrigerant type | Average weight (kg) | Note |
|---|---|---|---|
| Atlant (Atlant) | R134a / R600a | 9.5 - 10.5 | Classic piston models |
| LG / Samsung | R600a | 8.0 - 9.0 | Lightweight versions are often used |
| Whirlpool / Indesit | R134a | 10.0 - 11.0 | Massive engines of the old series |
| Electrolux | R600a | 8.5 - 9.5 | European standards weight |
| Biryusa | R134a | 9.8 - 10.8 | Universal heavy models |
As can be seen from the table, the spread is about 2-3 kilograms. Models for freon R600aare usually lighter. This is due to the design features and the smaller cylinder displacement required to work effectively with this type of gas.
How to find out the exact weight of your compressor
The most reliable way to find out the weight is find technical documentation or marking on the device itself. A metal tag riveted to the body usually shows the model number. Knowing it, you can find exact specifications on the manufacturer’s website or in spare parts catalogues.
If the documentation is lost, you can use the exclusion method. Weigh the entire refrigerator, then carefully remove all removable elements: shelves, drawers, doors (if the design allows), the back cover and the compressor itself. Weighing the dismantled unit on a floor scale will give the most accurate result.
- 🔍 Search by model: Enter the number from the nameplate (for example, FK 8.12 Y) into the search engine with the postscript "specs" or "characteristics".
- ⚖️ Direct weighing: Use a steelyard or floor scales to accurately determine the mass of the removed unit.
- 📞 Consultation: Contact the brand's service center, naming the model of the refrigerator - they can tell you the type of installed motor.
You should not rely on approximate estimates “by eye”. A visually compact compressor can be made of dense casting and weigh more than its larger, but hollow inside analogue. Accurate data is important for logistics and calculations.
☑️ Check before purchasing a used compressor
Weight features for disposal and scrapping
When scrapping a refrigerator, it is important to understand that the compressor is often assessed separately from the rest of the scrap metal. It contains a significant amount of non-ferrous metals (copper in windings), the cost of which is higher than the price of black steel housing.
Reception points may require preliminary removal of the compressor. In this case, knowing its weight will help you control the fairness of the weighing. The standard weight of 10 kg is a guideline, below which you should not go if the device looks intact and complete.
⚠️ Attention: Before scrapping, be sure to ensure that the refrigerant is completely removed from the system. The release of freon into the atmosphere is prohibited by environmental standards in most countries.
It is also worth considering that a copper condenser grille and aluminum evaporator tubes are often sold along with the compressor. The total weight of non-ferrous scrap from one refrigerator can reach 2-3 kg of pure copper and aluminum if all internal components are removed.
Why do they pay less for scrap than for parts?
In scrap you sell a mixture of metals at the minimum price. In a detail (if the compressor is working), its functionality and reusability are valued, and not just the weight of the metal.
Frequently asked questions (FAQ)
Is it possible to replace a heavy compressor with a lighter analogue?
Technically this is possible, but it is extremely undesirable without deep knowledge. A lighter motor may have lower performance, which will result in incomplete cooling of the chambers and overload the device. In addition, the seating and electrical parameters may not match.
Does the weight of the compressor affect energy consumption?
There is no direct relationship. Weight is determined by the design and materials. However, modern lightweight compressors are often more energy efficient (class A++), but this is a merit of technology, not light weight. An old, heavy motor may consume more energy due to wear and friction.
How much copper is contained in one compressor?
On average, one household compressor contains from 0.8 to 1.2 kg of pure copper (in the stator windings). The exact amount depends on the power of the engine and the year of its production. Older models usually have more copper.
Why can a new compressor weigh less than an old one?
Manufacturers are optimizing designs, using lighter aluminum alloys instead of cast iron in some components and reducing the amount of oil thanks to an improved lubrication system. This allows you to reduce the overall weight without loss of power.