Searching for the source of noise or the reason for the lack of cold often leads the owner of household appliances to the need to look “under the hood” of the unit. Many users mistakenly believe that compressor is located inside the refrigeration chamber, but this is not so. Motor-compressor is the heart of the system, which is always located outside the internal volume so as not to heat the products and not take up useful space.
In the standard design, regardless of the brand like Indesit or Beko, the motor is mounted on the outer rear wall in the lower part of the housing. This is where the refrigerant circulates and creates pressure in the system. Understanding the exact location of this unit is critical for carrying out initial diagnostics or maintenance.
Access to the unit usually does not require complex dismantling of the entire kitchen, but requires compliance with safety measures. Before you begin any manipulations, you must completely de-energize the device. This is a basic rule, ignoring which can lead to electric shock, since electrical contacts are under high voltage.
The location of the compressor in different types of refrigerators
The design of refrigeration equipment may vary depending on year of manufacture and model. In classic two-chamber models, such as Atlant or Stinol, the compressor is almost always located in a niche in the lower rear part of the housing. It is covered with a metal casing that protects the tubes and electrics from dust and mechanical damage. Removing this cover opens access to discharge pipes. suction pipes.
The situation changes when we are talking about built-in appliances or models with the system No Frost of the latest generation. In some modern solutions, engineers can move the unit to the side or even place it above the freezer for airflow, although this is less common. In two-compressor systems there may be two of them: one is responsible for the freezer, the second for the refrigerator compartment, and they are often located next to each other.
⚠️ Attention: In some refrigerator models Liebherr or premium series Bosch access to the motor may be limited by decorative panels or base Do not use force when removing plastic elements so as not to break the latches.
It is important to consider that location affects efficiency (heat transfer). If the refrigerator is located close to the wall, the motor may overheat, which shortens it working life. Therefore, when installing equipment, always leave a gap of at least 10 cm from the back wall to the furniture.
The design of the motor-compressor and the main elements
The “motor” itself is a sealed metal cylinder, inside of which there is an electric motor and a piston group. Externally, three main elements can be seen on the case: a starting relay, a protective thermal relay and a capacitor (in some models). These components are responsible for starting the rotor and protecting the windings from overload.
Copper tubes are suitable for the housing. One of them, usually thinner and curved, is the suction, and the second, often thicker and going to the condenser (radiator at the back), is the discharge. It is through these lines that freon circulates, transferring heat from the chambers to the outside. Any violation of the tightness of these connections leads to gas leakage and cooling stops. refrigerant (freon), transferring heat from the chambers to the outside. Any violation of the tightness of these connections leads to gas leakage and cooling stops.
Why is the compressor sealed?
A vacuum or filling with inert gas is created inside the housing, and there is also oil to lubricate the rubbing parts. If you open the housing, the oil will leak out and moisture will get inside, which will instantly damage the unit. Therefore, repairs are only possible by replacing the entire unit.
Many modern models, for example, from LG or Samsung, use inverter compressors. They are distinguished by the absence of a characteristic click when turned on and work constantly, changing the rotation speed. Their design is more complex, and electronic control unit is often integrated directly into the motor housing or placed separately.
How to access the engine: step-by-step instructions
To carry out a visual inspection or replacement, it is necessary to correctly dismantle the protective casing. This process does not require unique tools, but it does require precision. First, move the refrigerator away from the wall, providing yourself with convenient access to the rear panel from all sides.
Next, you should perform a series of sequential actions. Do not rush to remove the bolts until you are sure that the device is completely disconnected from the network. Check the integrity of the insulation of the wires going to the terminal box.
☑️ Algorithm for removing the casing
Fastening elements can be different: from standard bolts for a Phillips screwdriver to special clips. In older models Zanussi or Electrolux, the bolts may be covered with rust, which will require the use of a penetrating lubricant (for example, WD-40) before unscrewing. After removing the cover, you will have a view of the compressor, condenser grille and starting equipment.
Diagnostics of motor faults
Understanding where the motor is located allows for initial diagnosis. Users often confuse the noise of a fan with the hum of a compressor. If the unit hums, but does not produce cold, or turns on for a few seconds and clicks when turning off, these are signs of a serious malfunction malfunctions.
One of the simple ways to check is tactile. With the refrigerator running (be careful not to touch electrical parts!), touch the compressor housing. It should be warm or hot. If the engine is cold and silent, although the light inside is on, the problem may be in the thermostat or starting relay. If the motor is hot to the point where it is impossible to touch it, and does not work, the piston group may be jammed.
| Symptom | Probable cause | Necessary actions |
|---|---|---|
| Buzzes, but does not start | Faulty starting relay | Replace the relay |
| Gets very hot and turns off | Contaminator is dirty or leaking freon | Cleaning the grill or calling a technician |
| Makes a knocking or clanging | Destruction of the internal suspension | Replacing the compressor |
| Works continuously | Thermostat malfunction or leak | System diagnostics |
It is also worth paying attention to the condition of the tubes. If you see oily spots around the compressor connections, this is a sure sign of a refrigerant leak. In this case, simply replacing the motor will not help - a complete recharge of the system will be required, which is only possible using specialized equipment. service center using specialized equipment.
Replacing the compressor: is it worth doing it yourself?
Theoretically, knowing where the motor is located, it can be replaced. However, the replacement process is more complicated than simply unscrewing the bolts. The main difficulty lies in working with the refrigeration circuit. To dismantle the old unit and install a new unit, it is necessary to cut through the copper tubes and then solder new connections.
This requires gas welding equipment (torch, solder, flux) and, most importantly, a vacuum pump and a pressure gauge station for pumping out air and filling with freon. Without creating a vacuum in the system, the remaining moisture and air will turn into an ice plug that will block capillary tube, and the refrigerator will stop freezing in a few hours.
⚠️ Attention: Independent soldering of tubes without the appropriate experience and tools in 95% of cases leads to damage to the new compressor or a fire hazard. Freon under pressure can ignite upon contact with an open flame if it is not vented correctly.
In addition, it is necessary to select the correct compressor model. They differ in power, refrigerant (R134a, R600a), type of paw mounting and location of pipes. An error in selection, even by a few watts, can lead to incorrect operation of the thermostat and overheating system.
Frequent questions and answers (FAQ)
Is it possible to repair an old compressor if it has burned out?
At home, repairing a hermetic compressor is impossible. The case is welded at the factory, and opening it breaks the seal. Even if you replace the windings or bearings, it is impossible to reassemble it back to factory quality without special equipment. The only way is replacing the unit entirely.
Why does the refrigerator motor vibrate strongly?
Vibration can be caused by several reasons: loosening of the fastening bolts of the compressor itself to the frame, wear of the rubber shock absorbers (dampers) on which it is mounted, or internal imbalance of the rotor. Sometimes vibration is transmitted to the body if the refrigerator is not level. Check the adjusting supports at the bottom of the device.
How long does a motor-compressor last on average?
The service life of a modern compressor is from 10 to 15 years, provided proper operation. Inverter models from Whirlpool or Haier often have a declared resource of up to 20 years. However, frequent power surges in the network can significantly shorten this period, so it is recommended to use a voltage stabilizer.
Is it dangerous to touch the tubes near the motor?
Yes, it is dangerous. During operation, the discharge tube heats up to high temperatures (60-80°C and above), which can cause burns. The suction tube, on the other hand, may be very cold and frosty, causing the skin to stick. In addition, copper tubes are soft and easy to damage, breaking the tightness of the system.