Failure of the heart of the refrigeration system is always stressful for the owner of household appliances. Compressor It is the main engine that circulates the refrigerant, and without it the chamber turns into a simple cabinet. When an old unit burns out or jams, the master or owner faces a difficult dilemma: look for an original spare part or try to find a worthy analogue.
The question how to replace a compressor in a refrigeratordoes not have a universal answer, since each model requires an individual approach to the selection of technical characteristics. An incorrect choice can lead to rapid failure of a new part or ineffective operation of the entire cooling system. In this article we will analyze the nuances of selection, labeling and the replacement process.
The modern market offers many options, from expensive original spare parts to budget analogues from China. Understanding the principles of operation of the refrigeration unit will help you make an informed decision and save money without losing the quality of cooling.
Causes of failure of the old compressor
Before looking for a replacement, it is necessary to accurately diagnose the cause of the failure. Often malfunction hidden not only in the motor itself, but also in the accompanying elements of the system. If the root cause is not eliminated, the new compressor will suffer the same fate in no time.
One of the common problems is overheating of the motor windings due to improper operating conditions or poor ventilation of the condenser. It also causes breakdown hydraulic hammerwhen liquid refrigerant enters the piston cylinder, which physically destroys the compression mechanism.
⚠️ Attention: Before installing a new compressor, be sure to check the system for blockages in the capillary tube and filter drier. A clogged system is the main reason for repeated motor failure.
Sometimes the cause is a simple power surge in the network, which burns out the starting relay or windings. In rare cases, the culprit is a factory defect or natural wear and tear of rubbing parts after 10-15 years of operation.
Key parameters for selecting an analogue
Selection replacements requires careful study of the technical documentation or the sticker on the body of the old motor. The most important parameter is the cooling capacity, which must correspond to the volume of the chambers of your refrigerator. If you install a weak motor, the products will begin to deteriorate, and a strong one will work in short cycles, which is harmful for the engine.
The second critical parameter is the type used refrigerant. Compressors running on R134a freon are structurally different from those using R600a (isobutane). They have different operating pressure, oil type and even the diameter of the pipes, so interchangeability between them is impossible without serious reworking of the system.
It is also necessary to take into account the type of cooling: static (drip) or No Frost. Systems with automatic defrosting often require motors with increased performance or specific starting torque characteristics.
Is it possible to install a more powerful compressor?
Theoretically, it is possible if the mounting dimensions are the same. However, this will result in increased power consumption and noisier operation. In addition, the thermostat may not control such a motor correctly, which will shorten its service life.
The overall dimensions and location of the pipes play a decisive role in the physical installation. If the new unit does not fit into the normal place or the pipes face the other way, you will need to bend the copper tubes, which increases the risk of damage.
Deciphering the markings of popular brands
Understanding the codes on the nameplate will help you quickly determine what to replace a failed unit. Manufacturers use different coding systems, but the general principles are often similar. For example, for models Danfoss (now Secop), the first numbers often indicate the cylinder volume, and the letters indicate the type of refrigerant.
Chinese manufacturers, such as QD or Jiaxipera, use alphanumeric designations, where the last letter may indicate the mains voltage (for example, Y - 220-230V/50Hz). It is important to pay attention to the abbreviations LBP (Low Back Pressure) for household refrigerators and HBP (High Back Pressure) for air conditioners or wine coolers.
| Brand | Marking example | Refrigerant type | Purpose |
|---|---|---|---|
| Secop (Danfoss) | NL9F | R134a | Medium chambers |
| Embraco | EGU80CL | R134a | Household refrigerators |
| Jiaxipera | QD35Y | R600a | Small chambers |
| GMCC | QA89Y | R600a | Modern models |
When searching for an analogue in cross-reference catalogues, always check several parameters, not just the model. Sometimes the same code may have modifications with different starting characteristics.
Original or analogue: what to choose
The choice between an original spare part and a universal analogue often comes down to a balance of price and reliability. Original compressors ordered by the refrigerator model code guarantee a perfect match of all parameters. However, their cost can be unreasonably high, especially for equipment released more than 10 years ago.
Universal Substitutes from well-known brands (Secop, Embraco, GMCC) are often even better than the originals, since they are more modern developments. They can be quieter, more energy efficient and more reliable than older models that were installed at the refrigerator manufacturer.
Budget Chinese analogues without a well-known brand are a lottery. They are resource unpredictable: they can work for years, or they can burn out in a month. Savings in this case are questionable, given the cost of recharging the system.
⚠️ Attention: Technical characteristics and availability of compressor models may change by manufacturers. Before purchasing, check the current specifications in the official catalogs of spare parts suppliers.
If you choose a used compressor from disassembly, be sure to check its performance under load. Appearance does not always indicate the internal condition, and the lack of oil inside can be fatal.
Instructions for replacing a compressor with your own hands
Replacement compressor is a complex technical process that requires special tools and skills in working with gas. This is not just unscrewing the bolts, but working with a sealed circuit, requiring evacuation and filling.
The first stage is always a complete disconnection from the power supply and dismantling the old unit. It is necessary to carefully bite off the copper tubes, leaving a reserve for soldering, and drain the old compressor oil. It is important not to damage the evaporator and condenser when removing the motor from the niche.
☑️ Preparation for replacement
Installing a new motor requires careful preparation. New copper tubes are put on the pipes, the joints are cleaned and tinned. Soldering must be done quickly so as not to overheat the internals of the compressor, with the obligatory use of flux and solder containing silver.
After installation, a new one must be installed filter drier, since the old one is already saturated with moisture and will not be able to perform its function. Without replacing it, the moisture in the system will freeze in the capillary and block the circulation of freon.
Evacuation and refrigerant charging
After soldering all connections, the system must be checked for leaks. To do this, the circuit is filled with nitrogen under pressure and left for several hours, monitoring the readings pressure gauge. If the pressure drops, it means there is a microcrack or leak somewhere.
The next critical stage is vacuuming. Using a vacuum pump, air and moisture vapor are removed from the system. The process should last at least 30-40 minutes until a deep vacuum is achieved. This is necessary so that the water remaining in the system boils and evaporates at low pressure.
Refilling refrigerant is carried out strictly according to the weight indicated on the factory sticker of the refrigerator. The use of a cylinder with scales or a volumetric flask is mandatory, since filling “by eye” by pressure often leads to errors. Excess or lack of freon disrupts the operation of the refrigeration cycle.
After refilling, check the operation of the thermostat and the temperature in the chambers. The motor should turn on and off in normal mode, and the condenser (grid at the back) should warm up evenly.
Why can’t you fill it by eye?
Different refrigerants have different densities and operating pressures. Pressure is also highly dependent on ambient temperature. Charging by weight is the only accurate method to guarantee proper operation of the system.
Frequently asked questions (FAQ)
Is it possible to replace an R134a compressor with an R600a?
No, this is not possible without completely replacing the evaporator and condenser. These refrigerants have different operating pressures and oil requirements. The R600a compressor has a different design of the electrical part and pipes.
How much does it cost to replace a compressor with labor?
The cost consists of the price of a new unit, filter drier, refrigerant and the work of a technician. On average, the price varies widely depending on the model of the refrigerator and the region, but saving on the quality of spare parts is unacceptable here.
Is it necessary to flush the system when replacing a compressor?
If the old compressor burns out and releases oil into the system, flushing with nitrogen is mandatory. The acid contained in the oil combustion products will quickly kill the new engine if it gets into it.
Is the new compressor humming - is this normal?
A slight hum may be normal, especially immediately after installation. However, strong vibrations, clanging or knocking indicate a malfunction, incorrect fastening of the shock absorbers or electrical problems.