If your refrigerator Atlant stops freezing, but you can hear the hum of the motor inside or, conversely, there is complete silence, the problem often lies in the start-up protection relay This small device is responsible for starting the compressor and protecting its windings from overloads. Understanding where exactly this element is located is the first and most important step to self-diagnosis of the malfunction.
In this article we will analyze in detail the design of the refrigeration unit so that you can easily find the required unit. Location of the relay standard for most models of the Belarusian brand, however, there are nuances depending on the type of compressor and year of manufacture of the equipment. Knowing the exact location will save you time and avoid unnecessary disassembly of the case.
Before you begin the search, you need to protect yourself and the equipment. Working with electrical appliances requires basic safety precautions. Any manipulations inside the electrical circuit should be carried out only after completely disconnecting the device from the network.
⚠️ Attention: Before starting any work to find and replace the relay, be sure to disconnect the refrigerator from the power supply. The voltage remaining in the capacitors can be dangerous, even if the plug has already been unplugged from the socket.
You do not need complex professional tools to access the internal components. A regular Phillips screwdriver and possibly pliers will suffice. The main thing is to act carefully so as not to damage fragile plastic elements or copper tubes.
Design and purpose of the starting device
The starting protection relay is a compact unit that is attached directly to the compressor housing. Its main task is to supply the necessary impulse to the starting winding of the motor so that the shaft begins to rotate. As soon as the motor reaches the required speed, the relay opens the starting winding circuit, and the refrigerator operates on the main one.
Models Atlant most often use two types of devices: induction (electromagnetic) and posistor. The first are typical for older models with motors of the CDK series, the second - for modern compressors. Operation principle They differ, but the location on the unit remains almost identical.
Inside the relay housing there are contacts, springs and, in the case of with posistor models, a ceramic element that changes its resistance when heated. It is this element that often fails, ceasing to pass current or, conversely, permanently closing the circuit. It is difficult to visually determine a breakdown; a continuity test with a multimeter is required.
What is the difference between different types of relays?
Induction relays emit a characteristic click when starting and shutting down, while posistor relays operate almost silently. PTC models are more reliable and less sensitive to voltage changes in the network, however, they require time to cool down (about 3-5 minutes) before restarting the compressor.
If the relay is faulty, the compressor may hum, trying to start, but never start. At this moment, the thermal protection is triggered and the unit turns off. After some time, the cycle repeats. This behavior is a sure sign that you need to look for and check this particular unit.
The exact location of the relay on the compressor
To find the relay, you need to gain access to the lower back of the refrigerator. This is where the compressor is located - a black metal tank that is the “heart” of the cooling system. The relay is always located at the end of this tank, on the side where the electrical contacts and copper tubes come out.
In most models Atlant, such as the popular MXM or XM series, access to the rear panel can be closed with a decorative cover. It is secured with latches or screws. Having removed this protection, you will see the compressor to which the wiring harness fits.
Mounting location the relay is the rear end of the compressor shaft. It fits directly onto the three pins coming out of the motor housing. On top of the relay is often covered with a metal bracket or a plastic casing, which fixes its position and protects it from vibrations.
Please note that not only the wiring from the network is suitable for the relay, but also the wires from the thermostat. In some modifications, a separate thermal protection relay may be located next to the main starting relay, but in modern models Atlant these functions are often combined in one housing.
If a metal mesh or grille is installed at the back, it will also have to be dismantled. Be careful with copper tubes: they are thin and easily deformed. Any damage to the circuit will lead to a freon leak and will require expensive repairs from a technician.
Dismantling and visual inspection of the element
The process of removing the relay does not require high qualifications, but requires care. Once you have reached the compressor and made sure that there is no voltage, you can begin dismantling. First, the connector with the wires coming from the refrigerator body is disconnected.
Next you need to remove the fixing bracket. In older models it can be fastened with a screw, in new ones it is simply snapped into place. Using a flathead screwdriver, carefully pry up the bracket and remove it. After this, the relay can be pulled down, removing it from the compressor pins.
- 🔌 Disconnecting the wires: Carefully remove the block with the wires, without pulling the cables themselves, so as not to break them at the base.
- 🔧 Removing the fixation: Remove the metal strip or plastic holder holding the housing relay on the shaft.
- 📉 Removing from the pins: Smoothly rocking from side to side, pull the relay down. It should come off with force, but without jerking.
After removing the device, inspect its body. There should be no cracks, traces of burning or melting of the plastic. If you see black spots or smell burnt insulation, then relay malfunction it is obvious, and its replacement is necessary.
☑️ Check before removal
Also inspect the contact pins themselves on the compressor. They must be clean, free of oxides and soot. If the contacts are blackened, they should be carefully cleaned with fine sandpaper before installing a new relay. Dirty contacts can cause repeated breakdowns.
Correspondence table for relay models and types
When searching for a spare part, it is important to know which relay is installed in your model Atlant. Different compressors require different starting devices. Below is a table that will help you navigate the type of device depending on the refrigerator series.
| Atlant refrigerator series | Compressor type | Relay type | Features installation |
|---|---|---|---|
| MHM 1700, 1800 | CDK (Narodno-Posad) | Induction (RTK) | Fixation with bracket, vertical position |
| MXM 2800, 4000 | Atlant / Danfoss | Posistor (RTP) | Latch fastening, marking 100N or 117N |
| Style, Atlant 6th generation | Inverter | Electronic unit | Located separately, requires configuration |
| Single chamber (SC) | Small-sized | Posistor | Compact housing, often combined with a capacitor |
As can be seen from the table, older models with compressors CDK are characterized by heavy induction relays with copper coil inside. For more modern two-chamber refrigerators, lightweight plastic blocks with a posistor are used. Replacement one type cannot be changed to another without altering the circuit.
When purchasing a new part, be sure to check the markings on the body of the old relay. Numbers such as 100N, 117N, RTK-1X indicate current characteristics. Installing a relay with an inappropriate response current may result in either the inability to start the motor or its burning out.
Diagnostics and performance testing
Before running to the store for a new part, it makes sense to check the old one. To do this, you will need a multimeter switched to resistance (Ohms) measurement mode. The test allows you to accurately determine whether the problem lies in the relay or in the compressor itself.
First, ring the contacts corresponding to the starting and operating windings. In a working posistor relay, the resistance between the contacts should be in the range of 20-60 Ohms. If the device shows infinity (open) or zero (short circuit), the relay is faulty.
⚠️ Attention: Do not try to test the relay connected to the network or touch the contacts while the refrigerator is running. This may result in high electrical shock.
Also check the thermal protection if it is built into the relay housing. The resistance between the input contact and the contact going to the compressor should be close to zero. If the circuit does not ring, it means that the bimetallic plate inside is burnt out or stuck.
Sometimes the problem may not be in the relay itself, but in the capacitor, which is often mounted nearby. A swollen capacitor also prevents the engine from starting normally. This is visually noticeable by the deformation of the top cover of the cylindrical part.
Replacement and assembly of the unit
If the diagnostics confirm the malfunction, a replacement is made. Buy a similar relay with the same markings. Installation is carried out in the reverse order of dismantling. It is important to orient the device correctly: there are usually arrows on the case indicating the top (UP) or bottom.
Push the relay onto the compressor pins until it stops. It should fit tightly. Then replace the retaining bracket and connect the electrical connector. Make sure that the wires do not touch hot parts of the compressor or sharp metal edges.
After assembly, do not rush to close the back panel. Plug in the refrigerator and listen. If you hear the engine start confidently and after a while cold appears in the chamber, it means the repair was successful. If the humming continues, the problem may be deeper.
In some cases, the starting capacitor may also need to be replaced, especially if the old one looks swollen. This is an inexpensive part, and its preventive replacement together with the relay will extend the service life of the new spare part.
What to do if the new relay clicks, but the refrigerator does not turn on?
If after replacing the relay you hear clicks, but the compressor does not start or immediately hums and turns off, the problem may be in the compressor itself (interturn short circuit, piston group wedge) or in the absence of freon. It is also worth checking the integrity of the motor windings with a multimeter. If the resistance of the windings is normal, but there is no start, the thermostat may be faulty and is not sending a signal to turn on.
Is it possible to temporarily start a refrigerator without a relay?
There is a method of starting the compressor directly through a button or wire, bypassing the start relay, but this can only be done for short-term diagnostics and is extremely dangerous. This requires precise knowledge of the winding layout. For constant operation of the relay, it is necessary: without it, the compressor will burn out in a few minutes due to overheating of the starting winding.
Why does the relay burn out constantly?
Frequent replacement of the relay may indicate an unstable voltage in the network, problems with the wiring in the refrigerator itself (bad contact in the connectors) or that the compressor is “heavy” for this relay type. Also, the reason may be incorrect orientation of the relay during installation or the use of a cheap analogue with a low resource.
Where to buy an original relay for Atlant?
Original spare parts and high-quality analogues (for example, Racket, Danfoss) are sold in specialized stores of spare parts for household appliances, as well as in authorized service centers of the brand. When purchasing, pay attention to the presence of markings and the country of production.