Refrigerators Biryusa are deservedly considered one of the most reliable units on the domestic market, however, even time-tested equipment may require the intervention of a specialist. The most common cause of sudden compressor failure or idling is the failure of the start relay. It is this small element that is responsible for starting the engine and protecting it from overloads, so understanding the principles of its operation is necessary for every owner.
When you hear a characteristic click, followed by the hum of the motor, or, conversely, silence after connecting to the network, you know that starting relaycomes into play. In this article, we will analyze in detail what is happening inside this device, how to distinguish its breakdown from other faults, and whether it is possible to replace it yourself without calling a specialist.
Ignoring the symptoms of a malfunction can lead to burnout of the compressor windings, which will turn a simple repair into an expensive replacement of the entire unit. Old Biryusa models often use RTK relays, which over time lose their properties due to wear of the contact group. Timely diagnostics will help preserve the “heart” of your refrigerator and extend its service life for many years.
The operating principle of the starting relay
To understand how a relay works in a refrigerator Biryusa, you need to imagine the process of starting an electric motor. When switched on, the compressor requires significantly more energy than to maintain shaft rotation. The starting relay, in fact, is an automatic switch that supplies current to the starting winding only at the moment of start.
Inside the device there is a coil through which the current of the main winding passes. When the current reaches a certain value, the magnetic field draws in the core, closing the contacts of the starting winding. The engine starts, the current drops, and the relay opens the circuit, leaving only the main winding to work. This is a classic circuit for current relay, which are most common in budget models.
Thermal protection often works in parallel with the starting function. It is a bimetallic plate that bends when heated. If the compressor overheats or the current is too high, the circuit breaks, preventing fire or insulation melting. In models Turk these two elements are often combined in one housing.
- 🔌 Electromagnetic effect: is created when current passes through a coil, triggering the mechanism.
- 🔄 Cyclicity: process closing and opening occurs in a fraction of a second at each start.
- 🛡️ Protection: Thermal relay saves the motor from overheating by opening the circuit at critical temperatures.
⚠️ Attention: An attempt to start the compressor without a relay or with shorted contacts can lead to instantaneous burnout of the motor starting winding. Never ignore clicks and hums without starting.
Modern modifications may use electronic components, but classic mechanical relays remain the standard for many series Biryusa. Their reliability has been tested for decades, however, they also have their own resource, which runs out faster if the voltage in the network is unstable.
The main types of relays in the Biryusa technique
In refrigerators of the brand Biryusa depending on the year of manufacture and model of the compressor, various types can be installed starting devices. The most common models are RTK (Kotelnikovo Current Relay) and RTP (Current Relay with Starting Thermal Protection). They visually differ in the shape of the housing and the location of the contacts.
Relays of type RTK usually have a vertical installation and are attached directly to the compressor housing. Inside them there is a movable core and contacts. Relays RTP are often made in a black plastic case and are also equipped with thermal protection. It is important to accurately determine the type of device before purchasing a replacement, since they are not always interchangeable without modifications.
Also in newer models there may be posistor relays. Their operating principle is based on a change in the resistance of a semiconductor element when heated by current. They do not have moving mechanical parts, which makes them more durable, but sensitive to voltage surges.
How to distinguish RTK from RTP?
RTK relays usually have a white or light gray case and marking RTK-1, RTK-2. RTP relays are most often black, marked RTP-1, RTP-2 and are often integrated with thermal protection into a single design. Visually, the RTP often looks more “monolithic.”
When replacing, it is important to pay attention not only to the markings, but also to the type of compressor. For single-phase motors with a starting winding, current relays are suitable, while motors with increased starting torque may require devices with a capacitor.
Symptoms of a faulty starting relay
Diagnosing a faulty relay is the first step to restoring the functionality of the refrigerator. Biryusa. Symptoms of breakdown are usually pronounced and do not require sophisticated equipment to identify. The owner can notice them long before the products begin to deteriorate.
One of the most characteristic signs is the cyclic turning on and off of the compressor. The motor hums for a few seconds, there is a loud click, and it goes silent. After some time, the cycle repeats. This indicates that the starting relay cannot hold the contacts or the thermal protection is triggered too quickly.
Another sign is the absence of a characteristic click when the refrigerator is turned on. If the unit is silent and does not try to start, perhaps the contacts inside the relay have oxidized or burned so much that the current simply does not pass. In rare cases, the relay may “stick”, and then the compressor will hum constantly, becoming very hot.
- 🔊 Loud clicks: repeated every 10-20 seconds of operation.
- 🔥 Case heating: the area near the compressor becomes hot to the touch.
- 💡 Flashing light: When you try to start, the lighting in the room may dim.
Sometimes a relay malfunction is accompanied by the smell of burning or melted plastic. In this case, operation of the refrigerator must be stopped immediately. Continuing to operate in this mode is guaranteed to lead to failure of the compressor itself.
Diagnostics and performance testing
Before going to the store for a new part, you need to make sure that the problem lies in the relay, and not in the compressor itself or wiring. To carry out diagnostics, you will need a multimeter and a minimum set of tools. Remember about safety precautions: all work is carried out only with the device disconnected from the network.
Remove the back cover of the refrigerator Biryusa and get to the compressor. Carefully remove the relay housing. Visually inspect the device: there should be no cracks, traces of burning or melting. If a ringing sound is heard inside the case when shaken, it means that the core or contacts have fallen apart - such a relay is definitely faulty.
Using a multimeter in continuity mode, check the integrity of the contacts. In the normal state (the relay lies on the table), the contacts of the starting winding should be open, and the thermal protection circuit should be closed. The coil resistance should be close to zero. If the multimeter shows infinity where the contact should be, the part requires replacement.
☑️ Relay diagnostics
⚠️ Attention: If after removing the relay and applying power directly (only for experienced ones!) the compressor does not start and hums, the problem may be in the wedge motor or winding breakage. Do not keep the direct connection longer than 3-5 seconds.
It is also worth checking the condition of the contacts on the compressor itself. If they are oxidized or covered with carbon deposits, even a new relay may not work correctly. Clean them with fine sandpaper or contact spray before installing a new part.
Instructions for replacing the relay with your own hands
Replacing the start relay in the refrigerator Biryusa is a procedure accessible to a person with minimal technical skills. The main thing is to act consistently and not to apply excessive force so as not to damage the fragile elements of the system.
First remove the old relay. It can be held on by latches, screws, or simply sit tightly on the contacts of the compressor. Remember or take a photo of which side and what contacts it was connected to. Typically, the connection diagram is drawn on the relay body itself or on a sticker next to the compressor.
Install the new relay, observing the orientation. The housing often has a marking UP or an arrow indicating the top position. Incorrect installation may result in the mechanism not working. Secure the device and put on the protective cover.
After assembly, turn on the refrigerator. The first startup may take longer than usual as the system needs to get up to operating mode. Listen: a smooth hum without clicks or knocks indicates a successful replacement.
Compatibility and characteristics table
When choosing a replacement, it is important to consider not only the brand of the refrigerator, but also the parameters of the compressor. Below is a table to help you navigate the main types of relays used in technology Biryusa.
| Relay type | Compatible compressors | Features | Average service life |
|---|---|---|---|
| RTK-1 | HK, HKN (old models) | Vertical installation, no thermal protection | 7-10 years |
| RTK-2 | Many Biryusa models | Universal, often paired with a separate thermal | 10-12 years |
| RTP-1 | Compressors with starting winding | Built-in thermal protection, compact housing | 10-15 years |
| Posistor | Modern models | Silent, without mechanical parts | 15+ years |
Please note that component manufacturers can change the design while maintaining the markings. Therefore, when purchasing, it is better to compare the appearance of the new part with the old one. If you are in doubt about the choice, it is better to take a relay with a current reserve than with a smaller one.
The use of non-original analogues is allowed if their electrical characteristics are the same. However, Chinese copies of low quality can burn out after a few months, so you should not save on this element.
Prevention and extension of service life
In order for the relay and refrigerator compressor Biryusa to last longer, it is necessary to provide them with the correct operating conditions. The main enemy of electronics and electricians is voltage surges and overheating. Installing a voltage stabilizer in the house can save equipment from many problems.
Regularly clean the condenser (the grill at the back of the refrigerator) from dust and animal hair. A clogged heat exchanger causes the compressor to work longer and harder, which leads to overheating and frequent activation of the thermal protection relay. This significantly reduces the life of the part.
Also make sure that the refrigerator stands level and does not touch the back wall of the furniture. The gap is necessary for air circulation. If you notice that the relay begins to click more often than usual, do not wait for a complete failure - carry out diagnostics in advance.
⚠️ Attention: If power surges occur frequently in your region, use a surge protector or stabilizer. Sharp surges can pierce the insulation of the relay coil even when it is turned off.
Following simple operating rules will allow your refrigerator to operate trouble-free for many years. The relay is a consumable item, but if treated with care, it may not be necessary to replace it soon.
Frequently asked questions (FAQ)
Can an old relay be repaired or should it be replaced immediately?
In most cases, repairing a relay is impractical. Inside there is a calibrated spring and contacts that burn out. An attempt to clean the contacts or bend the spring gives a temporary effect, but the reliability of such work will be low. It’s easier and safer to buy a new part.
Why does the new relay click, but the refrigerator does not turn on?
This may indicate a malfunction of the compressor itself (wedge, broken windings) or problems with the wiring. It is also possible that a relay with unsuitable current characteristics is installed. Check the integrity of the motor windings with a multimeter.
Where can you find the relay markings on the Biryusa refrigerator?
The markings are usually applied to the relay body itself (on the side or top). Additional information can be found on the sticker on the back wall of the refrigerator, which indicates the type of compressor and recommended spare parts.
Is it dangerous to change the relay yourself?
The replacement process is safe if the refrigerator is disconnected from the power supply. The only danger is if you try to diagnose with the power on without any knowledge of working with electricity. Be careful and do not touch live parts under voltage.
How much does it cost to replace a relay in a service compared to doing it yourself?
Independent replacement will cost you only the cost of the part (from 500 to 1500 rubles). In the service, the cost of calling a technician and work will be added to the cost of the relay, which can increase the amount by 2-3 times. In this case, the replacement itself takes 10-15 minutes.