How to remove the relay from the compressor of the Atlant refrigerator

Refrigerators Atlant are deservedly famous for their reliability and durability, however, even the highest quality equipment may experience electrical failures over time. One of the most common causes of compressor failure is the failure of the start-up relay, which is responsible for starting the engine and protecting it from overloads. If your refrigerator stops turning on, hums but does not start, or constantly clicks, the problem in 80% of cases lies in this small but critically important unit. Replacing or diagnosing this element requires care and compliance with safety precautions, since the work is carried out with high voltage.

Before proceeding with dismantling, it is necessary to clearly understand that the compressor is the heart of the refrigeration system, and any careless actions can lead to its breakdown or even fire. In this article we will look in detail at how to properly and safely remove the relay from the refrigerator compressor Atlant, what tools you will need for this and what nuances you should pay special attention to. You will learn how to distinguish a starting relay from a thermal one, how to check their performance and whether it is even worth doing the repairs yourself. Knowing these details will help you save time and money, as well as avoid calling a technician to simply replace a cheap part.

It is important to note that the design of the relay may differ depending on the model of your refrigerator and the year of its manufacture. In older models, relays of the PT type are often found, while in modern ones more compact solutions are used. Start relay is responsible for supplying increased voltage to the starting winding at the time of start, and thermal relay opens the circuit when overheating or overcurrent. Understanding how these components work is key to a successful repair. If you have never encountered the repair of household appliances before, carefully follow each step of the instructions and do not neglect safety precautions.

Fault diagnosis and signs of relay failure

Before disassembling refrigerator, you need to make sure that the problem really lies in the relay, and not in the compressor itself or the wiring. The symptoms of a faulty starter are usually quite obvious to an experienced technician, but for a novice it can be difficult to distinguish a faulty relay from other problems. The most common symptom is a characteristic click, after which the refrigerator either does not start at all, or works for a few seconds and turns off again. If you hear the hum of the motor, but no cold is produced, this is a good signal to check the electrical circuit.

A visual inspection can also provide a lot of information. If traces of melting, soot, or a burning smell are visible on the relay body, then the part definitely requires replacement. It is also worth checking the contacts for oxidation: if they are blackened or covered with a green coating, this creates additional resistance and disrupts the operation of the entire system. The main reason for relay failure is natural contact wear and degradation bimetallic plate over time. Sometimes the problem lies in sticking contacts, when the relay cannot break the circuit, which leads to overheating of the windings.

For more accurate diagnostics, you can use a multimeter. By ringing the contacts, you can determine the presence of a break or short circuit. If the resistance goes to infinity at the closed contacts or is zero where the insulation should be, the relay is faulty. It is also worth checking the thermal relay: when cold it should ring, and when heated (which is more difficult to check at home without special equipment) it should open the circuit. If you are not confident in your abilities, it is better to replace the part with a known good one, since it is inexpensive.

⚠️ Attention: If after replacing the relay the refrigerator still does not start or immediately knocks out the plugs, the compressor itself (interturn short circuit) or the wiring may be faulty. In this case, it is better to entrust further repairs to a professional.

Necessary tools and safety measures

Working with electrical appliances, especially such powerful ones as a refrigerator compressor, requires strict adherence to electrical safety rules. The first and most important step is to completely disconnect the device from the electrical outlet. It is not enough to simply turn off the refrigerator with a button; you must unplug the cord from the outlet. Any manipulations inside the housing under voltage are deadly. In addition, the compressor may have a residual charge, so after turning off it is recommended to wait 10-15 minutes before starting work.

To successfully remove the relay, you will need a minimum set of tools that can be found in any home. The main tool will be a flathead and Phillips screwdriver, preferably with insulated handles. You may also need pliers or pliers to remove clamps or secure wires. If you plan to not only remove, but also clean the contacts, prepare fine sandpaper or a needle file. To check the functionality, a multimeter will not be amiss.

• 🛠️ Screwdrivers (flat and Phillips) - for removing protective covers and terminal blocks.
• 🔧 Pliers - for carefully removing terminals and clamps if they are rusty.
• 🧤 Dielectric gloves - additional protection for hands when working with electrical equipment.
• 📱 Smartphone with a camera - to photograph the connection diagram before disassembling.

Pay special attention to preparing the workplace. The refrigerator must be moved away from the wall, providing access to the rear wall. Make sure the floor is dry and you are standing firmly. If the compressor is hot (although it should cool down after 15 minutes of sitting), give it time to cool completely. Working with hot parts can cause burns. Also check the integrity of the insulation on the wires: if it is damaged, restore it with insulating tape before connecting power.

Access to the compressor and removal of the protective casing

In refrigerators Atlant the compressor is located in the lower rear part of the case. To access it, you need to remove the metal cover that covers the motor-compressor and condenser. It is usually secured with several screws around the perimeter or with latches. In some models, to remove the cover you just need to pull it towards you, in others you need to unscrew 4-6 bolts. Act carefully so as not to bend the metal and damage the condenser tubes that may pass in the immediate vicinity.

After removing the cover, you will see a view of the compressor - a black metal “barrel” with copper tubes and an electrical cable suitable for it. It is at the end of this “barrel” that the required relay is located. It is a black or white plastic box placed on three pins extending out of the compressor housing. Wires from the network and from the thermostat fit into this box. Before removing the relay, carefully inspect its markings. The name of the model (for example, RTK, R-3, MKT) and the connection diagram are usually indicated on the case.

It is important not to confuse the relay with other elements, such as a capacitor (if your model has one) or temperature sensors. The relay is always placed directly on the contact group of the compressor. If there are wires suitable for the relay, they can be secured with a plastic tie or clip to the compressor housing. This clamp must be carefully loosened or cut to free the wires and be able to remove the relay. Do not pull the wires sharply so as not to tear them away from the internal contacts.

Sometimes access to the relay can be difficult due to the close proximity of the tubes or the refrigerator body itself. In such cases, it may be necessary to tilt the refrigerator slightly or temporarily remove the condenser grille, if the design allows it. The main thing is to provide yourself with a good overview and room to maneuver. Do not try to remove the relay “by touch” without seeing the contacts, as there is a high risk of damaging the fragile ceramic insulators or the contacts themselves.

Technology for removing the relay from the contact group

The process of removing the relay from the compressor is technically simple, but requires caution. The relay fits tightly onto the three compressor pins to ensure good electrical contact. Therefore, simply pulling it off with your fingers may not work, especially if the refrigerator is old and the plastic may have become slightly deformed due to temperature. Never use excessive force to loosen the relay from side to side, as you may break the compressor pins or damage the internal contact group.

The correct removal technology is as follows: with one hand you hold the relay body, and with the other you carefully but confidently pull it along the axis of the pins towards you. If the relay sits very tightly, you can slightly rock it from side to side with an amplitude of no more than 1-2 millimeters, while simultaneously pulling it out. In some cases, it helps to use a thin flat-head screwdriver, which can be used to carefully pry the edge of the relay at the junction with the compressor housing, acting as a lever. However, be extremely careful not to damage the plastic housing of the relay.

If the relay consists of two parts (starting and thermal), they can be removed together or separately, depending on the design. Models Atlant often use a single block, which is removed entirely. Inside you will see contacts that fit onto the compressor pins. These contacts must be clean and free of carbon deposits. If you see that the contacts are burnt, you can carefully clean them, but this is a temporary measure. It is best to replace the relay with a new one, since the restored element may work unstable.

After removing the relay, inspect the pins on the compressor. They should be smooth, without oxides and soot. If they are dirty, gently wipe them with a dry cloth or alcohol. Do not use abrasive materials to clean compressor pins. Also check the condition of the internal cavity of the relay: there should be no moisture, dust or insects. The presence of moisture inside the relay is a serious problem, indicating a leak or high humidity in the room.

⚠️ Attention: It is strictly forbidden to remove the relay with a sharp jerk or blow. The compressor pins are soldered into a sealed housing, and under strong mechanical stress, the tightness may be broken, which will lead to freon leakage and expensive repairs.

Disassembling the relay and checking the contacts

After the relay is removed from the compressor, it can be disassembled for more detailed inspection and cleaning. The relay housing usually consists of two halves held together by latches or screws. If they are latches, carefully pry them up around the perimeter with a flathead screwdriver. If there are screws, unscrew them. Inside you will see two main components: a start relay (often with a coil or posistor) and a thermal relay (with a bimetallic strip). Modern refrigerators Atlant often use a posistor starting relay, which does not have moving mechanical parts, unlike older induction models.

In induction relays, the main element is a coil and a movable core with contacts. Over time, the contacts may burn out and the spring may lose its elasticity. In posistor relays, there is nothing to break except the posistor itself, which changes its resistance when heated. If the posistor is crumbled or blackened, it needs to be replaced. The thermal relay contains a bimetallic plate, which, when heated, bends and opens the circuit. Check whether it moves freely, whether there are cracks or signs of overheating.

When cleaning contacts, use fine sandpaper (“zero”) or a needle file. Clean only the working surface of the contacts, being careful not to remove too much metal. After cleaning, blow off the relay with compressed air or gently brush off the dust with a soft brush. Reassemble the relay in reverse order, making sure that all parts are in place and nothing is loose. If the relay body has cracks, it is better to replace it, since moisture and dust can penetrate through the cracks.

Installing a new relay and checking operation

Installing a new or restored relay is done in the reverse order. First, make sure that the relay model matches yours exactly. The markings must match or be completely analogous (there are tables of interchangeability of relays for refrigerators Atlant). Place the relay onto the compressor pins, pressing it firmly until it stops. You should feel a characteristic click or a tight fit. Make sure that the relay sits straight and is not skewed.

Then connect the wires to the relay terminals according to the photograph taken earlier or the diagram on the case. Usually the wires are color coded, but you shouldn't rely on color alone, as previous craftsmen may have already made changes. Secure the wires with a clamp or clip to prevent them from dangling or touching hot parts of the compressor. After this, replace the compressor protective cover and secure it with screws.

Now you can turn on the refrigerator. In the first seconds after switching on, you can hear the hum of the compressor, which after 1-3 seconds should turn into a smooth operating sound. If the compressor starts up and begins to gain cold, it means the replacement was successful. If you hear clicks, the humming stops, or the refrigerator does not respond at all, immediately turn it off and check the connections again. Perhaps the relay is not fully seated on the contacts or the selected model is not suitable.

• ✅ The compressor started the first time and is running smoothly - the repair was completed successfully.
• ❌ Clicks are heard, but there is no start - check the reliability of the contacts and the integrity of the relay.
• ⚠️ Compressor buzzes and turns off after 5-10 seconds - perhaps the motor itself is faulty or the relay is not suitable for the current.

After successful startup, leave the refrigerator to work for several hours without loading food to make sure that it is stable and able to gain temperature. Monitor the temperature of the compressor housing: it should be warm, but not hot. If all parameters are normal, the repair can be considered complete. Regular cleaning of the condenser from dust will help extend the service life of both the compressor and the new relay.

⚠️ Attention: The relay parameters (operation current, type) must strictly correspond to the compressor model. Installing a relay with unsuitable characteristics can lead to burnout of the compressor windings. Always check the markings!

Frequently asked questions (FAQ)