If noise occurs or the need to replace a failed motor, the first question that arises before the master is an accurate understanding of exactly how the unit is secured in the specific building. The design of the refrigerated cabinet does not tolerate improvisation, because compressor it is the heart of the system, requiring rigid fixation, but at the same time vibration damping. Improper installation can lead to broken tubes, destruction of pipes, or increased noise during operation.
There are several basic layout and fixation schemes, which depend on the manufacturer, year of manufacture and model of household appliances. In old Soviet units and modern inverter systems, the approaches may be radically different. Understanding these nuances is critical for the safe dismantling and installation of new equipment without damaging the copper lines.
In this article we will analyze in detail all types of fasteners, the shock-absorbing materials used and the specific installation features of various brands. Engineering precision When assembling the unit, the long service life of the refrigerator is guaranteed. Let's look at what tools you will need and what to pay attention to first.
Main types of compressor suspension
The fundamental operating principle of any refrigeration machine is to minimize the transmission of vibration from the running engine to the metal cabinet body. A suspension system is used for this. The vast majority of modern and old models use spring suspension. It consists of three or four support points where the motor hangs on internal springs enclosed in rubber bushings.
This design allows the engine to freely “hover” inside the casing, compensating for vibrations. However, there are also more rigid mounting schemes, typical for compact or industrial models. In them, the engine can be bolted directly to the frame or bottom through vibration isolating gaskets. The choice of suspension type is dictated by the weight of the unit and noise level requirements.
⚠️ Attention: When transporting a refrigerator with a spring suspension, special transport bolts are often used to secure the springs. If you are changing the compressor, make sure that the new springs are not secured with shipping plugs, otherwise vibration will rupture the tubes.
There is also a distinction between lower and upper suspension. In the classic version, the springs are located at the bottom of the casing, and the engine is suspended from the bottom. In some models, especially built-in ones, there is a top mount or a combined version. Shock absorbers in such systems they play a key role, taking on the main load.
Structural elements of the fastening unit
To properly dismantle or install motor-compressor, you need to know the anatomy of the fastening unit. It consists of several critical elements, each of which performs its own function. Ignoring the condition of any of them will lead to unstable operation.
The basis is steel springs that support the weight of the engine. They are inserted into rubber dampers (silent blocks). These rubber elements dampen high-frequency vibrations. Metal cups or washers are placed on top of the springs, which rest against the protrusions on the compressor housing. This entire system is pulled together or fixed in a certain position.
In some designs, for example, the brand Whirlpool or Indesit, an additional adapter plate is used. It is attached to the bottom of the refrigerator, and the entire suspension assembly is installed on it. This allows you to standardize the seats for different engine models. Vibration dampers can be made in the form of separate cylinders or a single rubber platform.
Why does the compressor knock?
The knocking often occurs due to the fact that the suspension spring touches casing walls or the inner surface of the refrigerator body. This occurs when the rubber bushings wear out, when the spring stroke becomes too large, or when the motor is not aligned correctly after replacement.
The fastening bolts deserve special attention. Modern models often use non-standard pitch threads or special heads that require special tools. This is done to prevent unauthorized intervention. Fasteners must be tightened with a certain force: over-tightening deforms the rubber elements, and under-tightening causes play.
Fastening patterns in refrigerators of different brands
Although the physics of the process is the same, manufacturers often introduce their own design features. Knowing the specifics of the brand helps you quickly navigate the repair process. Below is a comparative table of common schemes.
| Brand | Suspension type | Mounting features | Location |
|---|---|---|---|
| Atlant | 3-point spring | Rubber bushings with metal cups | Lower, on the frame |
| LG | 4-point (rarely 3) | Use of plastic spring retainers | Lower, deep |
| Bosch/Siemens | Suspended on a platform | The engine is mounted on a common metal platform | Rear niche |
| Stinol | Classic 3-point | Simplified diagram, easily accessible bolts | Bottom, open |
For example, in refrigerators Samsung there is often a scheme where the compressor is closed with a decorative cover, which is also part of the ventilation system. Removing this cover requires care to avoid breaking the plastic latches. At the same time, models Liebherr use a complex damping system with additional rubber rings.
It is important to consider that in two-compressor models, the circuits may differ for the freezer and refrigeration compartments. The main, more powerful compressor may have a reinforced suspension, while the second, smaller one is attached more easily. Design always adapted to the dimensions and weight of a particular engine.
Tools and preparation for work
Before you begin manipulating the fastening, you need to prepare your workplace and tools. Working in the cramped conditions of a refrigerator niche requires compact and reliable tools. A standard home craftsman's set may not be suitable due to specific bolts.
You will definitely need:
- 🔧 A set of open-end and ring wrenches (sizes 8, 10, 12, 13 mm).
- 🔩 Screwdrivers with different types of blades (cross, flat, Torx).
- 🔨 Pliers with thin jaws for working in the depths of a niche.
- 🔦 A powerful flashlight or headlamp for illuminating the back wall.
Pay special attention to safety. Before starting work, the refrigerator must be disconnected from the power supply for at least 15-20 minutes. This is necessary to discharge the capacitors and reduce the pressure in the system, although this is secondary for mechanical removal of fasteners, it is critical for the safety of the electrical part.
⚠️ Attention: Never use an impact tool (drill/driver) to unscrew the compressor mounting bolts. Vibration can damage the soldering of copper tubes suitable for the unit, which will lead to freon leakage.
Also prepare a container for draining the oil if you plan to replace the compressor itself, and a rag for wiping surfaces from technical lubricant. It is better to work with gloves to avoid cuts on the sharp edges of the metal frame.
Step-by-step instructions for dismantling and installation
The process of replacing or rehanging the compressor requires sequential steps. Failure to do so may result in damage to the tubes or improper operation of the damping system. First, remove the rear protective panel by unscrewing the screws around the perimeter.
Next follow the algorithm:
- Inspect the fastening diagram and determine the type of bolts.
- Carefully bend the fixing petals (if any) on the springs.
- Holding the engine with your hand, unscrew the bolts securing it to the frame or bottom.
- Remove the compressor from the springs, being careful not to pull the tubes.
When installing a new unit, proceed in reverse order. First, slide the motor onto the lower spring cups, making sure they seat properly in the rubber bushings. Then, slightly lifting the motor, fix the upper fastenings or screw the platform to the frame. Alignment It should be perfect: the motor should not touch the walls of the niche.
☑️ Control of compressor installation
After mechanical installation, be sure to check the gaps. The distance between the compressor casing and the walls of the refrigerator should be uniform on all sides. If the motor is skewed, vibration during operation will be transmitted to the housing, causing loud noise.
Typical errors and troubleshooting
Even experienced craftsmen sometimes make mistakes during installation. One of the most common is the loss or replacement of rubber dampers with hard washers. This leads to the fact that vibration is transmitted directly to the metal, and the refrigerator begins to hum like a transformer box.
Another mistake is overtightening the bolts. Excessive force compresses the rubber bushing into a rigid body, and it stops working as a shock absorber. In addition, this can lead to deformation of the seats on the compressor housing. Tightening must be done by hand with a slight wrench force.
The problem of “walking” springs is often encountered. If the spring jumps out of place, this means that the rubber element is worn out or the retainer is not installed correctly. In some cases, the spring has to be bent, but it is better to replace the entire suspension assembly.
If after installation the compressor vibrates more than usual, check whether the copper tubes are touching each other or the cabinet walls. During operation, they may begin to hit the metal, making a ringing sound. To eliminate this, use plastic clamps or rubber gaskets to secure the lines.
Is it possible to use a compressor from another model?
Technically possible if the mounting dimensions, power and type of refrigerant are the same. However, the mounting may vary. In such cases, craftsmen often over-weld the frame or make an adapter plate, which requires high qualifications.
Why does the compressor heat up after replacement?
The reason may be not only a malfunction of the unit itself, but also poor ventilation due to improper installation. If the motor is pressed too close to the wall of the niche or is covered with unnecessary elements, heat transfer is disrupted.
Is it necessary to change the oil in a new compressor?
Modern compressors are supplied already filled with oil. Additional refueling is required only in rare cases of oil loss during transportation or if the model comes without refueling (dry). The type of oil must strictly correspond to the type of freon.