Brand refrigerators Nord for decades have proven themselves to be reliable and unpretentious equipment, popular in the post-Soviet space. The heart of any unit, be it a classic model with a freezer below or a modern one, is the compressor. It is this unit that circulates the refrigerant and creates the low temperatures necessary to preserve food. When the equipment stops cooling or begins to work intermittently, the first thing the owner asks is: what kind of motor is installed inside and can it be replaced? No Frost, is the compressor. It is this unit that circulates the refrigerant and creates the low temperatures necessary to preserve food. When the equipment stops cooling or starts working intermittently, the first thing the owner asks is: what kind of motor is installed inside and can it be replaced?
Understanding what which compressor is used in your model is critical for proper repair. Manufacturers often change component suppliers depending on the year of manufacture and product line. In refrigerators Nord you can find both classic piston units and more modern inverter solutions. An error in selecting power or starting type can lead to rapid breakdown of the new unit or failure of the entire electrical circuit.
In this article we will analyze in detail the design features of the motors used in this brand of equipment, consider ways to identify a faulty unit and give practical recommendations for selecting analogues. You will learn why it is important to pay attention to the type of refrigerant and starting device, as well as what markings indicate compatibility with your refrigerator model.
Types of compressors used in Nord refrigerators
The range of engines installed at the factory Nordis quite wide and depends on the price segment models. The most common option for budget and mid-range lines are piston compressors linear type. They work on the principle of a reciprocating piston that compresses freon gas. Such units are characterized by a simple design, maintainability and relatively low cost, although they create a noticeable noise level during operation.
In more expensive models, especially in series with a system No Frost and electronic control, rotational or even inverter ones are often used compressors. Rotary mechanisms compress the refrigerant by rotating the rotor, resulting in less vibration and quieter operation. Inverter models allow you to smoothly regulate power, saving energy and maintaining temperature with high accuracy, but they are much more difficult to diagnose and replace.
The type of refrigerant for which the engine is designed deserves special attention. Old models Nord often worked on R12which is now prohibited for production due to its harmful effects on the ozone layer. Modern units use R134a or isobutane R600a. Compressors for different types of freon have different internal pressure and oil, so their interchange without resoldering the system and replacing the filter-drier is impossible.
Main manufacturers and marking of components
Plant Nord (Donetsk) not produced compressors independently and purchased them from various suppliers. Over the years, motors from European, Asian and domestic factories could be found in refrigerator cases. The most common units were brand Atlant (Belarus), which were considered the reliability standard for this equipment. Compressors were also installed Danfoss (now Secop), Embraco, LG i Samsung.
Identification of the manufacturer is carried out by a sticker on the body of the black cylinder (tank) of the compressor. It shows the model, supply voltage, refrigerant type, cylinder volume and cooling capacity. For example, the marking CKN 105 H2 will indicate a model from Atlant, where the numbers indicate the cylinder volume in cubic centimeters, and the letter indicates the type of refrigerant. Knowing the manufacturer is important, since the fitting dimensions and length of the tubes may differ.
Often during repairs, the question arises about the interchangeability of brands. In most cases, if the overall dimensions, power (or slightly higher) and type of refrigerant are the same, compressors of different brands are compatible. However, starting relay an original one or one carefully selected according to electrical characteristics may be required, since starting currents for different engines may vary.
Refrigerant correspondence table
R12 - freon used before 1990s, requires mineral oil. R134a is a synthetic refrigerant and requires polyester oil. R600a is isobutane, explosive, requires special attention when soldering.
How to determine a compressor malfunction
Motor diagnostics is the first stage of repair. The lack of cold does not always mean the death of the compressor; sometimes the problem lies in a freon leak or a clogged capillary. However, if the engine hums but does not start, or starts for a few seconds and clicks and turns off, these are direct signs of a malfunction of the unit itself or the starting relay. Also an alarming signal is that the compressor housing is too hot, which cannot be held by hand.
For accurate diagnosis, you need to ring the windings with a multimeter. The normal resistance between the working and starting contacts is from 10 to 30 Ohms, and between the common contact and the body the resistance should be infinite (open). If the device shows a short circuit (0 Ohm) or a breakdown to the housing, the compressor must be disposed of. Important: before checking, remove the starting relay in order to test the motor contacts.
There is also a mechanical method of testing, but it requires caution. If the compressor hums but does not start, sometimes it helps to briefly apply voltage directly (via a button) while simultaneously turning the shaft. However, this method is risky and can lead to injury or permanent failure of the unit. If you do not have the skills to work with high voltage and refrigeration equipment, it is better to limit yourself to an electrical test.
☑️ Compressor diagnostics
Technical specifications for selection analog
When searching for a replacement, it is critical to take into account not only the brand, but also the technical parameters. Cooling capacity is measured in watts or kcal/hour and must match the requirements of your refrigerator compartment. Installing a motor that is too weak will result in the refrigerator not reaching temperature and running non-stop, burning itself out. A unit that is too powerful can cause water hammer in the system or incorrect operation of the thermostat.
Another key parameter is the diameter of the suction and discharge fittings (pipes). In modern models, they often come in different diameters, and if you buy a compressor with the wrong outlets, additional soldering of adapters will be required, which increases the risk of leakage. Also pay attention to the location of the tubes: they can be directed up, down or sideways, which affects the possibility of installation in a regular place without kinks.
Below is a table with the approximate characteristics of popular models of compressors found in refrigerators Nord:
| Compressor model | Manufacturer | Refrigerant | Power (W) | Start type |
|---|---|---|---|---|
| CKN 105 H2 | Atlant | R134a | 136 | RSIR |
| NL 10 FT | Danfoss/Secop | R134a | 145 | RSCR |
| FC 10 LB | Embraco | R134a | 160 | RSIR |
| MA 105 T | Atlant | R12 | 115 | RSIR |
| GS 12 LB | Embraco | R600a | 95 | RSIR |
The process of replacing a compressor with your own hands
Replacing a compressor is a complex technical procedure that requires special equipment: a vacuum pump, a pressure gauge station, a burner and a supply of refrigerant. A simple “reset” of the engine without evacuation of the system and refilling with freon will not produce results. First you need to bleed off the remaining gas (if any) and carefully bite off the filling tube. Then the condenser and evaporator tubes are cut off, and the compressor is removed from the frame.
Installation of a new unit begins with welding or soldering the suction and discharge tubes. Pay special attention to the soldering time: copper tubes melt quickly, and steel tubes (often used in capacitors) require higher temperatures and flux. Important: do not hold the flame in one place for a long time so as not to burn the tube inside. After installing the motor, be sure to replace the filter drier, since the old one is already saturated with moisture and can clog the capillary.
The next stage is vacuuming. The system must be completely dry and free of air. Connect the pump to the fitting and pump for at least 15-20 minutes. Only after this can you open the valve on the freon cylinder and fill the system strictly according to the weight indicated on the refrigerator tag or in the technical documentation. Overcharging or undercharging will lead to incorrect operation.
⚠️ Attention: Working with refrigerants requires a license and special equipment. Independent soldering under pressure and filling with gas is dangerous to life (risk of explosion of isobutane R600a) and can permanently damage the equipment. If you do not have experience and tools, entrust this task to professionals.
Common mistakes during repairs and their consequences
One of the most common mistakes is ignoring the cause of failure of an old compressor. If the engine burns out, it often releases oil combustion products and acid into the system. Installing a new compressor in a “dirty” system without flushing with alcohol or nitrogen will result in the new unit burning out in a few months. Acid number Oils are the main enemy of the longevity of the refrigerator.
Another mistake is the incorrect selection of the starting relay. Many craftsmen install the first relay they come across that fits the shape. However, the characteristics of the capacitor and bimetallic plate must strictly correspond to the starting currents of a particular motor. A discrepancy will either lead to constant clicking and non-starting, or to burnout of the compressor starting winding.
Vibration isolation is also often forgotten. The compressor is attached to the frame via rubber bushings. If, when replacing them, they are not installed or installed incorrectly (with distortion), vibration will be transmitted to the refrigerator body, causing loud noise and destruction of the solder joints of the tubes. The durability of the system directly depends on the quality of installation and the absence of mechanical stress.
The cost of repairs and the feasibility of restoration
When deciding on repairs, it is necessary to evaluate economic feasibility. The cost of a new compressor is a significant part of the price of a used refrigerator Nord. If you add to the price of the part the cost of the technician’s work, refilling with freon and calling out, the amount can reach 50-70% of the cost of a similar used refrigerator in working condition.
Repair makes sense if the refrigerator belongs to the premium line of the brand, has dual-circuit control or is in perfect external condition. In the case of simple models from 10-15 years ago, it is often cheaper and easier to purchase other equipment that will be more energy efficient and quiet. Older models consume significantly more electricity, which is more expensive in the long run.
However, if you have the skills and can perform the replacement yourself, paying only for materials, the repair will extend the life of the reliable Nord for another 5-7 years. This is an eco-friendly approach to reduce the amount of electronic waste. The main thing is to use high-quality components and not skimp on the filter-drier and vacuum.
⚠️ Attention: Prices for components and service center services may vary. Before starting repairs, check the current cost of the compressor of the desired model and consumables in specialized stores in your region.
FAQ: Frequently asked questions
Is it possible to replace the R12 compressor with R134a in the Nord refrigerator?
Theoretically, this is possible, but it requires a complete flushing of the system, changing the oil to synthetic (polyester) and installing a new filter drier. The thermostat may also need to be replaced. A simple one-to-one replacement without reworking the system is prohibited, since the oils and additives for these freons are incompatible.
Why does the new compressor get hotter than the old one?
Modern compressors often have a higher housing temperature (up to 90-100°C in the discharge zone), since they are more compact and more efficient at removing heat through the walls. If the refrigerator is cooling normally and the thermostat is working, moderate heating of the tank is normal. The only danger is overheating, in which the thermal protection is triggered and the motor turns off.
Where can you find the compressor marking if the sticker has been erased?
If the sticker is unreadable, you can try to determine the model by electrical parameters (current, winding resistance) and overall dimensions, comparing them with manufacturers' catalogs (Secop, Embraco, Atlant). Also sometimes the model is stamped on a metal tag or the case itself, but this is rare. As a last resort, they select an analogue based on power and type of refrigerant.
How long does the compressor last in a Nord refrigerator?
The average service life of piston compressors in household refrigerators is 10-15 years. With careful operation, no voltage surges and regular defrosting (for drip systems), high-quality motors from Atlant or Danfoss can work for 20 years or more.