A sudden stop of the compressor or the absence of the characteristic hum of a running unit often indicates problems in the electrical engine starting circuit. Owners of household appliances Atlant often face the need to replace or reconnect the starting device, especially if the unit has ceased to maintain the set temperature. Understanding the operating principle of this unit allows you to carry out repairs yourself, without resorting to the expensive services of service centers.
The process of replacing a component requires care and compliance with safety precautions, since the work is carried out with elements under high voltage. Start relay responsible for sending an impulse to the starting winding of the motor, ensuring its acceleration up to operating speed. Installation errors can lead to repeated failure of an expensive compressor or a short circuit in the wiring.
In this article we will analyze in detail the algorithm of actions necessary for the correct installation of a new element. You will learn how to identify contacts, in what order to connect them, and what to pay special attention to when diagnosing the system. A competent approach to repair will extend the life of your refrigerator and restore its functionality.
Diagnostics of a faulty starting relay
Before you start disassembling and replacing parts, you need to make sure that the problem lies in the starting device. Often users mistakenly blame the relay when the reason lies in the compressor or thermostat itself. The primary sign of a malfunction is a characteristic click, after which the motor hums for several seconds and then turns off, or complete silence when plugged in.
Visual inspection can also provide important clues. If traces of burning, melting of plastic or blackening of contacts are visible on the body of the device, then its performance is in great doubt. Thermal relaybuilt into the design could work due to overheating, but if it is not restored, then the element requires replacement.
For accurate diagnostics it is recommended use a multimeter. When testing contacts in good condition, the resistance should be close to zero (for closed contacts) or infinity (for open contacts), depending on the type of device and temperature. The lack of response from the device indicates an internal open circuit.
⚠️ Attention: Before starting any diagnostic work, be sure to disconnect the refrigerator from the electrical network. Working with live conductive elements is deadly.
There are several types of devices used in technology Atlant, and their diagnostics may vary. Induction models are tested for the ability of a magnet to hold the core, and posistor models are tested for changes in resistance when heated. Incorrect identification of the type of fault may lead to the purchase of an unsuitable spare part.
Types of relays and their design features
In Belarusian-made refrigerators, two main types of starting devices are most often used: induction and posistor. Induction models, such as RTP-0 or P-1, operate on the basis of an electromagnetic coil, which, when started, creates a magnetic field to close the contacts. They have a movable core and require strict orientation during installation (the "Up" arrow must point upward).
Posistor analogues, for example series RTK or RZ, do not have moving mechanical parts. They are based on a semiconductor element - a posistor, which heats up when current passes and sharply increases its resistance, breaking the circuit of the starting winding. Such devices are less sensitive to position in space, but more susceptible to power surges.
Externally, these devices may look similar, but their internal structure dictates different installation rules. Induction relays have a more complex contact system and are often equipped with an additional lever or spring. The posistor ones are a more compact unit, often filled with a compound or assembled in a plastic case without visible moving elements.
Can you change the types of relays?
In some cases, it is possible to replace an inductive relay with a posistor one and vice versa, but this requires re-soldering the wires and changing the connection diagram. Without deep knowledge of electrical engineering, it is better to install exactly the same model that was installed previously.
When purchasing a new spare part, pay attention to the markings. The numbers and letters on the housing indicate the compressor shaft diameter, the type of refrigerant and the permissible motor power. A discrepancy between the parameters may result in the engine not starting or operating in emergency mode.
Preparation for replacement and necessary tools
To successfully complete the work of replacing the starting device, you will need a minimum set of tools. First of all, this is a screwdriver (usually a Phillips or flathead, depending on the fastening of the compressor casing) and pliers. It would also be a good idea to have a wire stripper on hand if you need to update the contacts.
Be sure to prepare your work area. The rear wall of the refrigerator must be accessible, and the space around the compressor must be free of foreign objects. Good lighting will allow you to clearly see the colors of the wires and the markings on the terminals, which is critical for proper connections.
- 🛠️ A set of screwdrivers of different sizes for removing the mounting screws of the protective casing.
- 🔧 Pliers or pliers for carefully removing the terminals and securing the wires.
- 🧤 Dielectric gloves to ensure additional electrical safety.
- 📱 A smartphone with a camera for photographing the connection diagram before disassembly.
Before starting work, it is recommended to photograph the original position of the wires. Even if you are confident in your abilities, a photograph will be an excellent help if you forget which wire was connected where. Connection diagram different models Atlant may differ slightly.
☑️ Preparation for repair
Step-by-step instructions for connecting the relay
The process of installing a new starting device begins with removing the compressor protective casing. It is usually secured with latches or screws. After removing the casing, you will see a compressor with a protruding shaft with an old relay on it. Carefully remove it by pulling it down or rocking it from side to side, after disconnecting the terminals.
The next step is to directly connect the wires to the new device. There are usually markings on the relay body and on the compressor terminals: L (phase/line), N (zero), R or S (start winding), C or M (working winding). It is important not to mix up these contacts, as this can lead to burning of the motor windings.
Take the new element and push it onto the compressor shaft until it stops. Make sure it fits snugly and doesn't wobble. Then connect the wires to the appropriate terminals. If there is oxidation on the wires, clean them with a knife or sandpaper until shiny to ensure good contact.
| Designation on the relay | Contact function | Wire color (often) | Purpose |
|---|---|---|---|
| L (Line) | Line (Phase) | Brown / White | Power supply |
| N (Neutral) | Neutral (Zero) | Blue | Circuit closure |
| R / S | Start | Black / Red | Engine start |
| C / M | Common / Main (Work) | Green / Yellow | Main work |
After connecting all the wires, check the reliability of the connections again. The terminals should fit tightly and not fall off when lightly shaken. Make sure that the wires do not touch hot parts of the compressor or each other in areas without insulation.
Specifics of Atlant models with two compressors
Refrigerators Atlant with the No Frost system or simply two-chamber models are often equipped with two separate compressors: one for the refrigerator compartment, the other for the freezer. In such units, the procedure for replacing the relay is repeated twice, but it is important not to confuse the devices, since they may have different powers.
The starting relay of the freezer, as a rule, is designed for a more powerful compressor, since lower temperatures are required. The refrigerator compartment relay may be less powerful. Installing an element that is not suitable for power will lead to its rapid failure.
When replacing in two-compressor models, it is recommended to change the relay on both motors at once if they have worked for a long time. This is a preventive measure to avoid repeated repairs after a short period of time, since they have approximately the same service life.
Pay special attention to the thermal insulation of the wires in such models. In the limited space of the rear niche, two running compressors create increased temperatures, which can accelerate the aging of wire insulation. Use heat-resistant casings if necessary.
Checking performance after installation
After all connections have been made and checked, you can begin testing. Do not rush to immediately push the refrigerator against the wall. Leave access to the rear panel open so that in the event of an emergency (sparks, smoke) you can instantly turn off the power to the device.
Plug in the refrigerator. In the first seconds you should hear the engine start confidently. If a hum is heard, which after 3-5 seconds is replaced by a click and silence, then the engine does not start. This may indicate an incorrect connection or a malfunction of the compressor itself.
- ✅ The motor starts smoothly and runs without extraneous noise - the installation was successful.
- ❌ A crackling or humming noise is heard followed by shutdown - check the connection diagram.
- ❌ The compressor hums, but does not starts - the motor may be jammed or the new relay is faulty.
- ❌ Complete lack of response - check for voltage in the socket and the integrity of the cord.
Let the refrigerator run for about 15-20 minutes idle. At this time, you can check the temperature of the relay housing: it may warm up slightly, but should not be hot. If the heating is excessive, immediately turn off the device and recheck the contacts.
Frequent errors and precautions
One of the most A common mistake is to ignore the orientation of the device. Induction relays are sensitive to position in space. If you install them upside down or on their side, the core will not be able to move freely under the influence of gravity and the magnetic field, which will lead to the inability to start or, conversely, to failure to disconnect the starting winding.
Another mistake is using electrical tape to secure the wires instead of securely installing the terminals. The vibration of a running compressor weakens the connection over time, and the poor contact begins to heat up. Always use standard connectors or crimp new ones properly.
⚠️ Attention: Never leave the refrigerator turned on without the compressor casing installed for a long time. The casing not only protects from dust, but also directs air flow to cool the motor.
Also, users often forget to check the condition of the capacitor (if it is in the circuit). An old, swollen or dried out capacitor may not produce enough starting torque, causing the new relay to overload. When replacing a relay, it is advisable to check the capacitor as well.
Do not try to repair the relay itself by disassembling its housing. Modern devices are made in a non-separable sealed housing. Any attempt to open them violates the calibration and tightness, making further operation unsafe. Only a complete replacement with a new, serviceable element guarantees results.
Why does a new relay burn out immediately after installation?
A common reason is phase imbalance in the network or a malfunction of the compressor itself (interturn short circuit). If the new relay burns out again, the motor needs to be diagnosed by a professional.
Is it possible to install a relay from another refrigerator model on the Atlant?
Theoretically, it is possible if the electrical characteristics (starting current, voltage) and the geometric dimensions of the seat match. However, manufacturers use different pinout patterns. It is better to look for an original analogue or a universal relay with adapters to avoid connection problems.
How long does a starting relay last on average?
The average service life of a high-quality relay is 5-7 years of active use. However, with frequent power surges in the network or unstable operation of the compressor, this period can be reduced to 2-3 years. Regular maintenance and the use of a voltage stabilizer prolong the life of the device.
Why does the relay click, but the refrigerator does not turn on?
The click means that the thermal protection is activated and opens the circuit. This occurs if the compressor tries to start, but the current exceeds the norm. Reasons: a jammed compressor, a faulty relay (does not open the starting winding) or low voltage in the network.
Do I need to solder the wires when replacing?
In 95% of cases, soldering is not required. Standard relays for Atlant equipped with slip-on terminals that are simply put on the contacts. Soldering may be required only if the wires are burned off at the very base or the terminals are completely destroyed.