What kind of compressors are in Pozis refrigerators: design and features

Refrigerators Pozis deservedly enjoy respect in the post-Soviet space due to their reliability and ability to operate under unstable voltage conditions. The heart of any refrigeration unit is the compressor, and the cooling efficiency and durability of the equipment largely depend on its characteristics. Owners often wonder which components are installed inside, especially when planning repairs or replacing a failed element.

Understanding what what compressors are in Pozis refrigerators are used will help avoid diagnostic errors. The brand does not produce its engines independently, but purchases them from specialized supplier factories, among which Russian and Belarusian enterprises are leading. This allows you to maintain an affordable cost of the final product without sacrificing basic technical characteristics.

In this article we will analyze in detail the types of installed motors, their design features and the reasons for possible failures. You will learn how to distinguish standard equipment from analogues and what to look for when servicing. The vast majority of models use a single-compressor design with a linear piston engine.

Main suppliers and manufacturers of engines

When answering the question of what compressors are in refrigerators Pozis, it is necessary to take into account the geography of production. The main supplier for many years has been the plant Atlant (Republic of Belarus). These units have proven themselves to be “workhorses”, capable of operating for years without the intervention of service personnel. Their design is time-tested and adapted to domestic refrigerants.

Along with Belarusian products, in some series, especially those produced in different periods, you can find Chinese analogues or engines from the domestic Biryusa plant (Krasnoyarsk). However, the share of the latter is significantly smaller. It is important to understand that even if the motor housing looks the same externally, internal balancing and the quality of the windings may differ depending on the batch and year of manufacture.

Refrigerator manufacturers Pozis carefully control the quality of purchased components, but the human factor and logistics make their own adjustments. Therefore, when replacing a unit, technicians often recommend focusing not only on the brand of the refrigerator, but also on the exact parameters indicated on the nameplate of the old engine.

• 🏭 Atlant (Belarus) —the most common option, characterized by high maintainability and availability of spare parts.
• 🇨🇳 Chinese OEM manufacturers —they are less common, often differ from the standard the shape of the fastenings.
• 🇷🇺 Biryusa (Russia) - were installed in certain periods, compatible in size with Belarusian analogues.

It is worth noting that in modern models with The system No Frost can use more efficient modifications of engines capable of operating in intensive mode. This is due to the need for rapid freezing and maintaining a stable temperature in chambers with forced air circulation.

Design features and technical characteristics

The technical basis of most refrigerators Pozis is a sealed low-pressure piston compressor. It works on the principle of compressing gaseous refrigerant and pumping it through the system circuit. The engine, as a rule, is asynchronous, with a squirrel-cage rotor, which ensures simplicity of design and the absence of sparking elements.

The key characteristic is the cooling capacity, which varies depending on the model of the refrigerator. For small single-chamber units, motors of lower power are used, while for three-chamber models Pozis RK-139 or RSh-409 more powerful versions are required. Refrigerantused in the system also affects the type of compressor: old models worked on R12 freon, new ones - on environmentally friendly R600a.

An important element is the starting system. In most cases, a start-protection relay is used, which supplies a pulse to the starting winding and turns it off after the rotor accelerates. In more modern and expensive models, it may be found inverter control, although for the brand Pozis this is still the exception rather than the rule.

⚠️ Attention: An attempt to replace a compressor running on R600a freon with an analogue running R134a or R12 without a complete rework of the system and oil change is strictly prohibited. This will lead to an explosive situation or failure of the new motor.

Overall dimensions also matter. The standard height and distance between the fastening legs allow replacement without welding, however, in rare cases, adjustment of copper tubes may be required. Vibration during operation this is a normal phenomenon, but it should be uniform and not cause rattling of the refrigerator body.

Compatibility table and parameters of popular models

To simplify the search for spare parts, below is a summary table showing the dependence of the type of compressor on the series of the refrigerator. This data will help you navigate which unit is most likely installed in your equipment.

When selecting an analogue, always pay attention to the engine power (usually indicated in watts or through the cooling capacity in kcal/h). Installing a motor that is too weak will result in the refrigerator simply not reaching temperature, while a motor that is too powerful will operate in short cycles, which is harmful for the electrics.

It is also worth considering the diameter of the fittings of the suction and discharge tubes. Although the standards are unified, during the transition period there could be deviations requiring the use of adapters or soldering of inserts. Tightness connections are a critical parameter for long service.

Typical faults and their diagnosis

Despite for reliability, compressors in refrigerators Pozis are not insured against breakdowns. The most common problem is the failure of the start relay. In this case, the engine hums and tries to start, but after a few seconds a click is heard and it goes silent. This is a defensive reaction to the inability to turn the rotor.

A more serious situation is an interturn short circuit in the stator windings. The engine may hum, get warm, knock out the automatic switch in the dashboard, or simply be silent. You can check this using a multimeter by measuring winding resistance. If the resistance tends to zero or infinity, the motor requires replacement.

• 🔊 Knock and clanging - indicate breakdown of the crankshaft liners or piston group, often due to dry operation or prolonged inactivity.
• 🔥 Overheating of the housing —may indicate a loss of freon (the motor runs without stopping) or a clogged capillary system.
• ⚡ Knocking out plugs is a clear sign of a short circuit inside the electrical part of the engine.

Sometimes users confuse a compressor malfunction with thermostat problems. If the motor does not turn on at all, but starts when the contacts of the thermostat are closed, the problem is in the temperature sensor, not in the engine. Diagnostics must be comprehensive.

Instructions for checking functionality

Before making a decision to replace, you need to make sure that the problem lies in the compressor. To do this, you will need a minimum set of tools: a multimeter, pliers and, possibly, a new start relay for testing. Remember about safety precautions - all work is carried out only with the device disconnected from the network.

First, remove the back cover and gain access to the compressor. Visually inspect the assembly for external damage, melted wires, or traces of oil (which may indicate microcracks). The following is the procedure for testing the windings.

Remove the starting relay and check the contacts. The compressor must have three terminals: two working (main and starting windings) and one common. The resistance between the working terminals should be the sum of the resistances of each relative to the total. Also be sure to check breakdown on the housing: none of the contacts should ring with the metal housing of the motor.

⚠️ Attention: Do not try to start the compressor directly, bypassing the relay, if you do not have the skills of an electrician. This can lead to electric shock or damage to the windings due to the lack of a phase-shifting element.

If the electrical part is normal, but the refrigerator is not cooling, the compressor may have lost performance (compression). You can check this by biting off the filter drier and turning on the engine: a powerful flow of air should come from the discharge tube. Weak pressure indicates wear of the piston group.

Replacement and extension of service life

Replacing a compressor in a refrigerator Pozis is a labor-intensive process that requires a vacuum pump, a pressure gauge station and skills in soldering copper pipes. Independent replacement without equipment is impossible, since the system must be perfectly sealed and free of moisture and air.

To extend the life of a new or existing compressor, provide it with the correct operating conditions. Ventilation is a key factor. Do not move the refrigerator close to the wall, leave a gap to remove heat from the condenser. Overheating of the motor is the main reason for its premature death.

Also avoid frequent switching on and off. After defrosting or transporting, let the refrigerator sit for several hours before turning it on to allow the oil to drain into the compressor crankcase. A sharp start without oil is guaranteed to lead to scuffing and breakdown.

Regularly clean the rear grille of dust. The dust “shell” acts as a heat insulator, forcing the compressor to work longer and harder to achieve the set temperature. Simple vacuuming every six months can add several years of life to the equipment.