A modern household refrigerator Biryusa is a reliable unit that can work for many years, but even the highest quality equipment is subject to wear. One of the most common reasons why a compressor suddenly stops or fails to start is a faulty start relay. This small but critical element is responsible for supplying voltage to the motor windings at the moment of start and subsequent switching of operating modes.
If you notice that your Biryusa refrigerator buzzes, but does not start, or the motor turns on only for a few seconds, after which a characteristic click is heard and silence sets in, then with a high degree of probability the problem lies precisely in the trigger mechanism. Replacing this part on your own is a task quite feasible for a person who knows how to handle a screwdriver and a multimeter, but it requires strict adherence to safety precautions.
In this article we will analyze in detail the relay device, methods for diagnosing it and, most importantly, the correct algorithm for connecting a new part. Incorrect installation can lead to combustion of the compressor windings, so carefully study each step before starting work. Remember that any manipulations with the electrical part of the refrigerator must be carried out only when the power is disconnected from the mains.
The principle of operation and the design of the starting relay
The starting relay in refrigerators Biryusa, as in most other models, is electromagnetic switch. Its main task is to supply full current to the starting winding of the compressor only at the moment of starting. As soon as the engine rotor reaches the required speed, the relay must instantly break the circuit of the starting winding, leaving power only on the working winding.
Inside the device body there is an inductor and a movable core with a contact group. When voltage is applied, current passes through the coil, creating a magnetic field that draws in the core and closes the contacts of the starting winding. When the engine speed increases, the current in the working winding drops, the magnetic field weakens, and under the influence of gravity or a spring the contacts open. Some models use thermal relaywhich also protects the motor from overheating by opening the circuit when the temperature rises critically.
The design may vary depending on the series of the refrigerator Biryusa. There are models with side fastening of contacts and with bottom connection. It is important to understand that there is no electronics inside the relay in the modern sense - it is a purely mechanical device, where reliability depends on the condition of the contacts and the mobility of the core. It is the sticking of contacts or the loss of elasticity of the spring that most often causes a breakdown.
⚠️ Attention: A residual charge may accumulate inside the relay or carbon deposits may form on the contacts, causing sparking. When opening the case, be careful and do not touch the internal elements with your fingers if you are not sure that the device is completely de-energized.
For correct operation of the system, it is important that the relay matches the power of a particular compressor. Installing an element that is inappropriate for the cut-off current will either lead to frequent false shutdowns or to the fact that the starting winding will burn out, since the relay will not break the circuit in time. Therefore, when replacing, always focus on the markings on the body of the original part.
Diagnostics of faults before replacement
Before going to the store for a new spare part, you need to make sure that the problem lies in the relay, and not in the compressor or wiring itself. Primary diagnosis begins with a visual inspection and listening to the operation of the unit. If the refrigerator Biryusa is silent, but the light inside is on, this already narrows the search to the motor starting circuit.
Remove the rear protective panel of the refrigerator to gain access to the compressor. First of all, pay attention to the appearance of the relay: if traces of melting, soot, or a burning smell are visible on the plastic case, then the part definitely requires replacement. It is also worth checking the integrity of the suitable wires - they should not be broken or oxidized.
The most accurate test method is to use a multimeter. To do this, the relay must be carefully removed from the compressor contacts. Switch the device to resistance measurement mode (Ohm) and ring the contacts. The resistance between the contacts responsible for the starting circuit should be minimal or absent (depending on the type of relay and position), and the thermal protection should “ring” like regular wiring.
- 🔍 Check the integrity of the inductor - the resistance should be within the normal range specified in the technical documentation.
- 🔍 Inspect the contacts for oxidation - a black coating indicates a poor connection and sparking.
- 🔍 Shake the relay near your ear - if you hear the knocking of internal parts, it means the mechanism is destroyed.
If a visual inspection and testing with a multimeter do not reveal obvious defects, but the refrigerator still does not start, perhaps the relay “holds” the load only under voltage, and in behaves normally when cold. In such cases, the elimination method is often used, temporarily installing a known good relay. However, this method requires high qualifications and is dangerous for an untrained user.
Preparation for replacement and selection of components
Replacing a refrigerator relay Biryusa requires a minimal set of tools, but proper preparation of the workplace will greatly simplify the task. You will need a flathead and Phillips screwdriver, insulated pliers and preferably a multimeter for the final check. Also prepare a clean rag to wipe the compressor contacts from dust and possible oil.
A critically important step is to purchase the correct analogue. Relays for refrigerators Biryusa may differ in the type of mounting, number of contacts and operating current. On the body of an old part there is always a marking, for example, RTK-X, R-3, or more modern designations indicating the current strength (for example, 1/4 HP, 1/5 HP). Do not ignore these numbers, as they determine compatibility.
Before starting work, be sure to disconnect the refrigerator from the electrical network. Unplug the power cord and gain access to the rear wall of the unit. If the refrigerator was close to the wall, move it away so that you can move freely around the compressor compartment. Let the motor cool down if it tried to start before.
☑️ Preparing to replace the relay
When purchasing, pay attention to the manufacturer of the spare part. Original components Biryusa or proven brands like Danfoss (Secop) guarantee a long service life. Cheap Chinese analogues may not have proper calibration of thermal protection, which jeopardizes the safety of an expensive compressor. Saving on this part can lead to a major overhaul of the entire refrigerator.
Step-by-step instructions: how to remove and connect the relay
The process of dismantling and installing a new starting relay does not require special skills, but requires care and accuracy. The main rule is to remember or photograph the position of the wires and the part itself before removing. In refrigerators Biryusa the relay is usually mounted directly on the terminals of the compressor or on a bracket next to it.
First remove the protective casing, if any. Then carefully disconnect the wires going to the relay. In some models they are fixed with terminals, in others they can be soldered (which is less common in modern models). If the wires are tight, use pliers, but be careful not to damage the insulation or the compressor terminals themselves.
The relay itself is removed by moving upwards or to the side, depending on the type of seat. It is put on three contacts of the compressor: two main and one for the starting winding. Please note that the contacts have different shapes and sizes, which eliminates the possibility of incorrect installation in most cases, but it is easy to confuse the top and bottom.
Sequence of actions:1. Turn off the power.
2. Remove the back cover.
3. Disconnect the wires from the relay.
4. Remove the old relay from the compressor contacts.
5. Install a new relay (strictly in the “UP” or arrow orientation).
6. Connect the wires according to the diagram.
7. Close the cover and plug in.
When installing a new relay, make sure that it fits tightly and does not loosen. The contacts should fit into the sockets without excessive force, but with good pressure. If you are using a universal relay, carefully study the attached wiring diagram, as the pin layout may differ from the original one. After installing all the elements, return the protective panel to its place.
What to do if the new relay does not fit in size?
Sometimes universal relays have extra plastic elements or fasteners that interfere with installation in a specific Biryusa model. In this case, you can carefully remove the interfering parts of the case without damaging the internal mechanics and contacts. The main thing is to ensure reliable fixation on the compressor terminals.
Connection diagram and compatibility table
Correct connection of wires is the key to successful repair. Refrigerators Biryusa most often use standard color coding, but it may vary depending on the year of manufacture. Typically, the ground wire is yellow-green in color, phase and neutral can be brown, blue or white.
The relay itself often has a connection diagram printed on it, or the contacts are marked with letters: C (Common - common), R (Run - working), S (Start - starting). It is important not to confuse these conclusions, since applying voltage to the wrong winding will lead to instant failure of either the relay or the motor.
Below is a table that will help you navigate the main types of relays used in Biryusa refrigerators and their characteristics.
| Relay type | Marking | Cut-off current | Installation features |
|---|---|---|---|
| Electromagnetic | RTK-1, RTK-2 | 1.3 - 1.6 A | Vertical, up arrow |
| Thermal | P-3, P-4 | Depends on the model | Requires close contact with housing |
| Posistor | PTC Relay | Universal | Any position, but preferably vertical |
When connecting wires, use the original terminals. If the old terminals have oxidized or broken off, they must be replaced with new ones of the appropriate diameter. Twisting wires and insulating them with electrical tape in the immediate vicinity of a hot compressor is unacceptable - this is a fire hazard and short-lived.
Frequent installation errors and precautions
Even with instructions, beginners often make mistakes that negate all efforts or lead to new breakdowns. The most common mistake is incorrect orientation of the relay during installation. On the body of most relays for refrigerators Biryusa there is an arrow or inscription UPthat should point straight up. If you install the relay upside down, gravity will not be able to open the contacts, and the starting winding will burn out.
Another mistake is ignoring the state of the contacts on the compressor itself. If you put a new relay on oxidized or burnt motor pins, the contact will be poor, causing heat and repeated failure. Before installation, clean the compressor contacts with fine sandpaper or a file until they have a metallic shine.
They also often forget to check the integrity of the wires coming from the relay to the network. If the insulation is frayed and there is a short circuit to the housing, the new relay may immediately fail or knock out the circuit breaker in the panel. Carefully inspect the entire wiring harness for damage.
⚠️ Attention: Never turn on the refrigerator without the rear protective panel and relay cover installed during testing. Open contacts are under high voltage, and accidental contact can be deadly.
If after replacing the relay the refrigerator started working, but after a while it stopped starting again, the problem may be deeper. Perhaps the compressor itself is faulty (interturn short circuit) or there are problems with the thermostat. In this case, it is better to stop self-repair and contact a professional technician.
Checking the operation after replacement
After all connections have been made and protective covers installed, the moment of truth comes - the first launch. Plug in the refrigerator. In the first seconds you can hear a characteristic hum, which after 1-3 seconds should be replaced by the smooth sound of a running engine. A clicking sound at startup is normal and means the relay has activated.
Pay attention to the behavior of the compressor. If it hums, but does not start, and after a few seconds the click is heard again, immediately unplug the device. This is a signal that either the relay is not suitable for the current, or it is installed incorrectly, or the problem is in the motor itself. Long-term operation in this mode (“start-click-start”) will quickly kill the compressor.
If the startup was successful, let the refrigerator run idle for about 30-40 minutes. Periodically check the temperature of the relay housing - it should not become too hot to touch. Light heat is acceptable, but strong heating indicates poor contact or overload.
- 👂 Listen to the rhythm of operation: it should be uniform, without extraneous knocks and vibrations.
- 🌡️ Check the heating: after an hour of operation, the compressor should be hot, but the relay should be warm.
- ❄️ Assess the cold: after 1-2 hours the chamber should start to get colder, which will confirm the normal operation of the system.
After making sure that it is working properly, you can push the refrigerator into place, leaving a gap for ventilation of the back wall. Regularly check the operation of the unit in the first day after repair.
Is it possible to install a relay from another refrigerator model on Biryusa?
Yes, it is possible, but only if the electrical characteristics match. The main thing is the cut-off current and the type of fastening. If the parameters are the same, but the seat is different, you can use adapters or carefully modify the mount without violating the integrity of the contacts.
Why does a new relay burn out immediately after installation?
Most often this happens due to a malfunction of the compressor itself (jamming or short-circuiting of the windings), which consumes too much current. The cause may also be incorrect installation (upside down) or power surges in the network. Before replacing, always check the resistance of the motor windings.
How often do you need to change the relay in the Biryusa refrigerator?
The service life of a high-quality relay is 5-10 years or more. However, with frequent voltage drops in the network or unstable operation of the thermostat (frequent on-off cycles), the service life of the part may be reduced to 2-3 years. Scheduled replacement is not required, they are replaced only if it breaks.