What compressors are on the Don refrigerator: types and manufacturers

Owners of domestically produced refrigeration equipment are often faced with the need to repair or modernize equipment, and the first question in the event of a breakdown is choosing a suitable unit. Don refrigerators, produced at the Morozko plant and other capacities, over the many years of their existence they were equipped with various types of motor-compressors. Understanding exactly which unit is installed in your model is critical for the correct selection of spare parts and successful restoration of the equipment. In this article we will analyze in detail which compressors are found in these refrigerators, how to identify them and what to look for when purchasing a replacement.

The history of the production of these refrigerators goes back decades, and during this time the technological base has changed several times. Early models were equipped exclusively with piston units, which were highly reliable, but created noticeable noise during operation. Modern modifications can be equipped with quieter and more economical options, however old school still dominates the fleet of used equipment. Knowing the specifics of the installed equipment will help you avoid purchasing an incompatible part, which is especially important when doing your own repairs.

It is important to understand that there is no universal answer to the question about the manufacturer, since the assembly plant could use components from different suppliers depending on the year of manufacture and the availability of components on the market. Atlant, Danfoss and Chinese brands - all of them could get into the body of your refrigerator. Therefore, visual inspection and reading the markings on the compressor itself are a mandatory step before starting any work. Do not rely only on the model of the refrigerator, since different motors could be used in the same series.

Main manufacturers of compressors for Don equipment

By analyzing the spare parts market and statistics of service centers, several key ones can be identified brands whose motors are most often found inside “Don” housings. The undisputed leader is the products Atlant OJSC (Republic of Belarus). These compressors have proven to be workhorses, capable of operating for years even in less-than-ideal conditions. Their design is maximally adapted to domestic electrical networks and climatic conditions, which makes them the preferred choice for replacement.

The second most common group consists of compressors of the Danish brand Danfoss (now Secop), which were often installed in more expensive or export models. These units are renowned for their energy efficiency and low noise levels, but their repair is often considered uneconomical due to the complexity of the design and the high cost of original spare parts. There are also models marked Embraco, which are characterized by high performance and were often used in two-compressor systems.

In later series and budget modifications you can find products from Chinese factories, such as Jiaxipera or LG (Chinese assembly). They are, as a rule, cheaper to produce, but may be inferior in resource intensity to their European and Belarusian counterparts. When choosing a replacement, it is important to take into account not only the overall dimensions, but also the type of refrigerant for which the unit is designed, since mixing oils or using the wrong freon can lead to rapid failure of the entire system.

⚠️ Attention: When buying a used compressor from hand, be sure to check the integrity of the fittings. The presence of traces of soldering or welding on the tubes may indicate a previous unsuccessful repair, which significantly reduces the reliability of the unit.

Technical characteristics and markings

To select the correct analogue, you must be able to read labeling codemarked on metal body of the device. Usually this data is located on a sticker or stamped directly on the metal. The key parameters are cooling capacity, refrigerant type (R12, R134a, R600a) and power consumption. For example, in the marking of Belarusian compressors there is often an alphanumeric code, where the first letter indicates the type of refrigerant, and the numbers indicate the power.

Particular attention should be paid to the parameter cooling capacity, which is measured in watts or kcal/hour. Installing a compressor with less power will result in the refrigerator not reaching the desired temperature, and a unit with excess power can cause incorrect operation of the thermostat and defrost system. Rated power is also important for coordination with the start-up relay, which must match the current characteristics of the new motor.

Modern models often run on environmentally friendly refrigerant R600a (isobutane), which is an explosive gas. Working with such systems requires special care and special equipment for vacuuming and filling. Old models were most often refilled R12 or R134a. An attempt to replace a compressor designed for one type of freon with a unit for another type, without completely flushing the system and changing the oil, is strictly prohibited.

How to decipher the Atlant marking?

In the marking of Atlant compressors, for example SKO-100, the letter "C" means compressor, "K" - low pressure, "O" stands for cooling, and the numbers indicate cooling capacity. It is better to check a more accurate decoding with the manufacturer’s table, since the range is extensive.

Compatibility table and common models

Below is a table that will help you navigate the most common connections “refrigerator model - type of installed compressor.” Remember that these are average data, and in a particular instance the manufacturer could have installed an analogue depending on the configuration.

Using this table allows you to narrow your search when ordering spare parts. However, the visual verification mounting holes and height of the compressor are required. Overall dimensions may differ even for units with the same performance. If the new compressor turns out to be taller or wider than the standard one, it may simply not fit into its regular place in the niche or rest against the rear wall of the housing.

Features of replacement and selection of analogues

The process of replacing a motor-compressor is one of the most difficult types of repair of household appliances. It requires not only mechanical skills, but also the presence of special tools: a pipe cutter, a rolling machine, a vacuum pump and a pressure gauge station. Soldering of copper tubes must be done using a protective atmosphere (nitrogen) or special fluxes to avoid oxidation of the inner surface of the pipelines, which can lead to clogging of the capillary system.

When selecting an analogue, follow the rule: it is better to take a compressor with a slightly higher cooling capacity than one with a lower one. However, the difference should not exceed 10-15% of the nominal value. It is also important to check the type of starter. Some modern compressors require the installation of start relay a specific design or even a frequency converter if we are talking about inverter models, although for Don refrigerators the classic circuit with a conventional relay is more common.

Pay special attention to the condition of the condenser and evaporator before installing a new motor. If there was compressor breakdown in the system (a winding burned out with the release of oil and acid into the circuit), simply replacing the motor without flushing the system will lead to the death of the new part within several months or even weeks. In such cases, installation of a filter-drier of increased capacity and thorough purging of the circuit is required.

Typical faults and diagnostics

Before making a decision on replacement, it is necessary to accurately diagnose the fault. Often, a failure of the starting relay or thermostat is mistaken for a compressor failure. If, when you turn on the refrigerator, you hear a click, the motor tries to start, hums for a few seconds and clicks again - this is a classic sign malfunction of the starting device or jamming of the piston group.

If the motor is silent, but the relay clicks, or does not make any sounds at all, the problem may be in a winding break or lack of power. You can check the integrity of the windings with a multimeter by measuring the resistance between the contacts of the base. The normal resistance of the working winding is usually 10-30 Ohms, the starting winding is 30-50 Ohms, and the resistance between the housing and the contacts should be infinite (there should be no breakdown to the housing).

⚠️ Attention: If you find that the compressor housing is breaking through to the ground (there is resistance between tubes/housing and contacts), operation of such a refrigerator is deadly. Immediately disconnect the device from the network.

Where to look for information and original spare parts

It is best to start searching for information about a specific modification from the technical sticker located inside the refrigerator compartment or on the back wall. The exact factory number and date of production is indicated there. Using this data, you can find an electrical diagram and product data sheet, which often indicates the type of recommended compressor. The archives of Don manufacturing plants (Donetsk, Ordzhonikidze, etc.) can be scattered, so forums of refrigeration specialists are often more useful than official websites.

When purchasing spare parts, give preference to specialized stores that provide a warranty. Market offers of “remanufactured” compressors often do not live up to expectations. Original new An Atlant unit or a high-quality analogue from a well-known brand will last much longer than a hand-built motor. Always ask for a receipt and a warranty card, since defects in new compressors, although rare, do occur.

Remember that technology does not stand still, and sometimes it is impossible to find a direct replacement. In such cases, technicians resort to installation universal compressors, which requires changing the configuration of pipelines and selecting relays. This is a complex engineering task, the solution of which is best entrusted to professionals who have access to technical compatibility catalogs.

Is it possible to replace the R12 compressor on R134a in the Don refrigerator?

Theoretically this is possible, but it requires a complete oil change in the system (flushing), replacement of the filter drier and thermostat. Oils for R12 (mineral) and R134a (synthetic) do not mix. A simple replacement without flushing will lead to the formation of acid plugs and rapid failure of the new compressor.

Why is the new compressor humming?

The hum can be caused by improper installation (tubes touching the housing or walls of the niche), vibration, malfunction of the unit itself, or operation at the power limit. Also, the reason may be airing of the system or poor-quality soldering, which creates obstacles to the flow of refrigerant.

How much does it cost to replace a compressor in the service?

The cost consists of the price of the compressor itself and the work of the technician. On average, taking into account the visit, diagnostics, cost of materials (freon, filter, solder) and work, the price can vary widely. The exact amount can be found out only after diagnosing a specific model.

Which compressor is quieter: Atlant or Danfoss?

As a rule, compressors Danfoss (Secop) are considered quieter and smoother in operation compared to standard models Atlant. However, the noise level also depends on the condition of the shock absorbers, fastening and resonance of the tubes of a particular refrigerator.