Brand refrigerators Atlant are deservedly popular due to their reliability and maintainability, however Even the best quality equipment breaks down over time. Most often, owners are faced with a situation where the compressor hums but does not start, or turns on for just a few seconds and immediately turns off with a characteristic click. In most cases, the reason lies in a malfunction of the start-up relay, which is responsible for starting the engine and protecting it from overloads.
Independent installation of a relay in the refrigerator Atlant is a very real task for a person who has basic skills in working with tools and basic understanding of electrical circuits. Replacing this part is much cheaper than calling a technician, and the process itself takes little time if you have a working spare part. However, it is important to understand that working with electrical appliances requires strict adherence to safety precautions and precise actions.
In this article we will look in detail at how to correctly diagnose a breakdown, select the appropriate part and carry out a replacement without errors. You will learn about the differences between inductive and posistor relays, the features of their connection to different models of compressors, and nuances that beginners often miss. A correctly performed replacement will extend the life of your refrigerator and restore its normal operation.
Diagnostics of a faulty start-up relay
Before you start disassembling the unit and purchasing new parts, you need to make sure that the problem lies in the relay. The first sign of a malfunction is a characteristic sound: the refrigerator turns on, there is a loud click, the motor hums for a couple of seconds, then another click follows, and the operation stops. If at the same time the compressor remains hot and the chamber is warm, then the probability of failure of the trigger mechanism is extremely high.
For more accurate diagnostics, you will need a multimeter. After unplugging the refrigerator and removing the rear protective panel, you need to visually inspect the relay for melting, cracks, or a burning smell. If there are no external defects, the part must be “ringed”. In good condition, the resistance of the windings must meet technical standards, and the circuit must not be broken. Often it is the positor inside the housing that burns out or the contacts of the induction coil are jammed.
It is also important to check the compressor itself to exclude its turn-to-turn short circuit, which could cause the relay to burn out. If the motor “rings” on the housing or shows zero resistance between the windings, installing a new relay will be useless - the motor will burn out instantly. Therefore, make sure that the reason lies precisely in the control element, and not in the heart of the refrigerator.
⚠️ Attention: If after clicking the relay knocks out automatic plugs throughout the apartment, immediately stop trying to start it. This indicates a short circuit in the compressor circuit or wiring, which is life-threatening.
There is a simple folk method for checking an induction relay: if you shake it near your ear and you can hear the knocking of the core inside, this does not always mean a breakdown, but if the contacts are visually burnt, replacement is required. For posistor models, a visual inspection is often not informative, and checking with a multimeter is the only reliable way.
Choosing a suitable relay for the Atlant model
Refrigerators Atlant are equipped with compressors of various types, and, accordingly, they require different relays. The main division occurs into induction (electromagnetic) and posistor (thermal) devices. Induction relays are more common in older single-compressor models, they have a vertical installation and a coil that retracts the core when starting. PTC relays are typical for more modern models and two-compressor units; they work due to the property of the ceramic element to heat up and change resistance.
When selecting spare parts, it is critical to pay attention to the markings on the housing. For example, for compressors Atlant SKO series, relays RT, R-1, R-2 or more modern analogues from Danfoss and Secopcan be used. A mismatch in the type of engine power relay will either result in the engine not starting or in its rapid combustion due to untimely opening of the starting winding.
The table below shows the main types of relays and their compatibility with compressor series, which will help you navigate when purchasing:
| Relay type | Marking | Installation features | Compatible compressors |
|---|---|---|---|
| Induction | RT-1, RT-2, R-1 | Strictly vertical, arrow up | Old models Atlant, SKO |
| Posistor | RTK, 100N0011 | Any position (usually horizontal) | Modern models, two-compressor |
| Combined | Danfoss 101L0011 | Depends on the modification | Imported and licensed motors |
You should not try to save money and buy universal Chinese analogues without exact matching of parameters. Original relays or their high-quality European analogues provide correct startup phasing and reliable thermal protection. When purchasing, be sure to compare the number of contacts and the shape of the seat with the old part.
Necessary tools and safety measures
Working with electrical equipment requires preparation of the workplace and the availability of appropriate tools. You don't need a complex professional kit, but you should have some basic tools on hand. Before starting any work, the refrigerator must be completely disconnected from the electrical network by removing the plug from the socket. This is an axiom, the violation of which can lead to electric shock.
To dismantle and install the relay you will need:
- 🔧 Screwdrivers (Phillips and flat) for removing the protective cover and clamps.
- 🔪 A stationery knife or side cutters for stripping wires (if required).
- 🔌 Pliers for reliable connection of terminals.
- 📸 Smartphone (for photographing the connection diagram before disassembling).
- 🧤 Dielectric gloves (recommended for additional safety).
Pay special attention to the condition of the wires going to the compressor. If the insulation is melted or cracked, it must be repaired before installing a new relay. Use heat shrink or good quality electrical tape. Also check for traces of moisture on the back wall of the refrigerator, as water can cause a short circuit immediately after switching on.
⚠️ Attention: It is strictly forbidden to carry out work on replacing the relay with wet hands or standing on a wet floor. Make sure that the access area to the rear panel is dry and light.
Sometimes removing the old relay requires force, as it can “stick” to the compressor terminals due to heat. In this case, do not use a hammer or sharp objects to avoid damaging the condenser tubes. Carefully loosen the housing and remove it, holding the compressor with your other hand.
Step-by-step instructions for removing the old relay
The process of removing the faulty part begins with access to the compressor, which is located in the lower rear part of the refrigerator. Remove the cardboard or metal protective panel by unscrewing the mounting screws. You will see a view of the motor-compressor, to the bottom of which a plastic or metal box is attached - this is the start-up relay.
First of all, disconnect the wires going to the relay. Modern models Atlant use a detachable chip that you simply need to pull out. In older models, the wires may be twisted or soldered. If the wires are twisted, carefully unwind them, first remembering or photographing the connection order. If soldering was used, the wires will have to be cut, leaving a reserve for subsequent twisting.
The relay itself is held on three terminals of the compressor and is fixed with a metal bracket or spring clip.
Operation diagram:
1. Remove the metal retaining bracket.
2. Rocking from side to side, pull the relay down from the compressor contacts.
3. Disconnect the wires from the relay terminals (if they are not on a common chip).
It is important not to mix up the wires when disconnecting. The phase wire usually goes directly to the relay, the neutral wire also, and the ground wire (if any) is attached to the housing. It's best to take a close-up photo before you finally remove the old part. This will help to avoid errors during assembly.
☑️ Check before installation
Technology for installing and connecting a new relay
Installation of a new start-protective relay is carried out in the reverse order of dismantling. First of all, it is necessary to correctly orient the part relative to the compressor terminals. There is always a marking or arrow on the relay body indicating the "UP" position. This is a critical point: induction relays only work in a vertical position, since the core must be lowered by gravity after the engine starts.
Place the relay onto the three pins of the compressor. It should fit tightly, without distortion. If the mounting location is different, you may need an adapter or adapter, which is sometimes included with universal relays. Make sure that the contacts inside the relay are clean and not oxidized, otherwise the connection will heat up.
Next comes the stage of connecting the wires.
Connection order:
1. Connect the power wire to the corresponding relay terminal.
2. Connect the wires coming from the thermostat and the protective casing.
3. If the wires have been cut, twist them according to the colors or according to the photo taken earlier, carefully insulate the twisted places.
After connecting the electrical part, install the metal fixing clamp in place. It must hold the relay securely so that the vibration of the operating compressor does not break the contact. Then you can proceed to a test run, but do not close the back panel completely yet.
Connection features for different Atlant models
The range of refrigerators Atlant is extensive, and connection nuances may occur in different series. For example, in dual-compressor models, the relays may be located symmetrically, and it is important not to confuse them, although physically they may fit both motors. The difference may be in the length of the starting pulse, which affects the engine life.
In models with the No Frost system, the relays are often protected by an additional plastic casing from moisture and condensation. When installing a new part, make sure that this housing is installed tightly. Moisture on the posistor contacts can cause false operation or, conversely, sticking of the contacts.
For older models, where a relay type RT is mounted directly on the terminals without an additional chip, it is important to check the tension of the spring contacts. Over time, the metal gets tired and the contact weakens, which leads to sparking. When installing a new relay, you can gently (with tweezers) slightly press the contacts for a tighter fit to the compressor pins.
⚠️ Attention: If after installing the new relay the refrigerator works, but after a while (10-15 minutes) it turns off again, the problem may not be in the relay, but in the thermostat or leakage Freon. The relay has nothing to do with it, it simply performs its protective function.
It is also worth mentioning the rare cases when relays from other manufacturers are installed on compressors Atlant (for example, Indesit or Beko). This is permissible only if the electrical characteristics and mounting geometry completely match. Otherwise, the service life of the compressor may be reduced.
What to do if the new relay is humming?
If after replacement you hear a continuous humming sound, but the refrigerator does not cool, the relay may not open the starting winding. It's dangerous! Turn off the appliance immediately. The reason may be a defective relay or a jammed compressor piston.
Checking performance and common errors
After everything is assembled, the moment of truth comes. Plug in the refrigerator. Normal operation is characterized by the following algorithm: a click is heard, the motor starts, after 1-3 seconds there is a second quiet click (the starting winding is turned off), and the compressor enters the operating rhythm with a uniform hum. If this cycle is broken, it means that an error has been made somewhere.
Frequent errors when replacing yourself:
- ❌ Incorrect orientation of the relay (upside down or sideways for induction models).
- ❌ Poor contact in twisted wires, leading to heating and sparking.
- ❌ Using a relay with an inappropriate operating current (too powerful or weak).
- ❌ Ignoring the condition of the wires (insulation cracks, oxidation of terminals).
Pay attention to the temperature of the relay body during operation. It should not become heated to the point where it is impossible to touch. Only warm heating is allowed. If the relay is hot, it means that current passes through the starting winding constantly, which is unacceptable and leads to engine combustion.
In conclusion, I would like to note that although replacing a relay is a simple procedure, it requires care. If you doubt your abilities or the problem does not disappear after replacement, it is better to contact a professional technician for an in-depth diagnosis of the system.
Frequently asked questions (FAQ)
Is it possible to install a relay from another brand on an Atlant refrigerator?
Yes, it is possible, but only if the electrical parameters (current, voltage) and geometric parameters match seat dimensions. It is best to look for analogues specifically designed for compressors of the SKO series or indicated in the compatibility table.
Why did the relay burn out and will it happen again?
Relays often burn due to voltage surges in the network or problems with the compressor itself (hard start). If the reason is jumps, a stabilizer will help. If the compressor is worn out, the relay will light up regularly.
How much does it cost to replace the relay in a service compared to doing it yourself?
Independent replacement will cost the cost of the part itself (from 500 to 1500 rubles). The service will have to pay for diagnostics, a technician’s visit and the work itself, which in total can be 2-3 times more expensive than the cost of the spare part.
Is it necessary to defrost the refrigerator before replacing the relay?
Full defrosting is not necessary, since access to the compressor is from the outside. However, if there is a lot of ice in the chamber and you plan to tilt the refrigerator for access, it is better to defrost it so that water does not get on the electrical contacts.