Search start relay in the refrigerator Biryusa is the first and most important step in self-diagnosis of a malfunction. If your unit has stopped cooling, but is still making a buzzing or clicking noise, the problem most often lies in this unit. The location of the element depends on the design of the compressor and the model of the refrigerator, but in most cases the search algorithm is the same for all modifications of the brand.
In this article we will analyze in detail how to get to the desired part without damaging other components of the system. You will learn what it looks like start relay, why it fails and what to do if you find a defect. It is important to understand that any work with electrical components requires first disconnecting the device from the network.
Before you begin disassembling, make sure that you have the necessary tools on hand. A simple Phillips screwdriver and pliers are usually sufficient. You should not ignore safety precautions, since inside the refrigerator there are live parts and fragile tubes with freon.
Typical location of the part in Biryusa models
In the vast majority of refrigerators Biryusa, both old and modern, the start relay is attached directly to the casing compressor. The compressor is usually located at the lower rear of the unit. To see it, you do not need to disassemble the entire refrigerator, just move it away from the wall and remove the back metal cover that covers the motor compartment.
The relay is placed directly on the protruding contacts of the compressor. It is a black or white plastic box to which the wires fit. In some models, especially those that are built-in or have a bottom compressor with a special layout, access may be slightly difficult, but the principle remains the same: look for the black “pot” of the motor, and on its side there is a small box.
⚠️ Attention: Before removing the protective cover of the engine compartment, be sure to disconnect the refrigerator from the electrical outlet. Even after switching off, there may be a residual charge in the capacitors, so do not touch the contacts with bare hands unless necessary.
Sometimes users confuse the start relay with the thermostat or defrost relay. The key difference is that the starting device is always located on the compressor itself. If you see a part hanging from wires on the top of the camera or on the wall, that's not what we're looking for. Our goal is a unit mechanically connected to the motor.
Visual identification of the starting relay
In order not to make a mistake when searching, you need to know what the element you are looking for looks like. Start-protective relay in refrigerators Biryusa most often it has a rectangular or square shape made of black plastic. A marking may be stamped on its body, for example, RTK, R-3 or DHR, which indicates the type of device.
Electrical wires approach the relay from the side or bottom, usually two or three. They connect the relay to the starting capacitor (if there is one in the circuit) and the network cable. The relay body itself is attached to the compressor either with latches or a metal bracket-bar, which presses it to the output of the windings.
- 🔌 Contacts: The three pins included in the relay body correspond to the starting, working winding and the common wire.
- 📦 Case: Plastic a shell that protects the insides from moisture and dust.
- 🧲 Core: Inside there is an electromagnetic coil and a movable core with a contact group.
If traces of burning, melting or melting are visible on the case cracks, this is a sure sign that the relay has burned out. In this case, a visual inspection can immediately answer the question about the cause of the breakdown. However, even an apparently serviceable part may not work, so a more in-depth check is often required.
Instructions for accessing the relay
The process of gaining access to the start relay in the refrigerator Biryusa does not require complex engineering skills, but does require accuracy. Follow the step-by-step algorithm to avoid damaging the fragile copper tubes coming from the compressor.
☑️ Preparing to remove the relay
First move the refrigerator so that it is convenient for you to work from behind. Using a screwdriver, remove the screws securing the rear cover of the engine compartment. In some models Biryusa the cover can be removable without screws, simply with latches, but most often fasteners are used.
After removing the cover you will see the compressor. The relay is located behind or to the side of it. If the condenser (a metal coil with fins) is in the way, proceed with caution. Sometimes, for easy access, you need to temporarily bend the capacitor grille, but try not to apply much force to it.
To remove the relay itself, you need to carefully press the fixing tabs or remove the metal bracket. Then the part is simply pulled back from the compressor contacts. Do not pull sharply so as not to break the wires, which can become hard from time to time.
⚠️ Attention: The copper tubes coming from the compressor are very soft. Any careless movement of the tool can pierce the tube, which will lead to freon leakage. Work carefully and do not use force.
Diagnostics of relay faults
You can understand what exactly has gone wrong starting relayby characteristic signs. The refrigerator Biryusa may turn on, hum for a few seconds, and then click and turn off. This phenomenon is called "cyclic start" and indicates that the motor cannot start.
If you remove the relay and shake it near your ear, you can hear a rattling sound. This means that the internal mechanism is destroyed or the moving core is loose. A working relay should not make any sounds when shaking, since all the elements inside are tightly fixedated.
It is also worth checking the contacts for the presence of oxides or carbon deposits. If the contacts are blackened, the current flows worse, which leads to overheating and eventual failure. In some cases, the relay can be disassembled and the contacts cleaned, but it is easier and more reliable to replace it.
Why does the relay fail?
A frequent cause of failure is a voltage surge in the network or natural wear of the contact group. Also, the relay can burn out if the compressor itself has an interturn short circuit and consumes too much current, so before installing a new relay, it is advisable to check the current consumption of the motor with a current clamp, if possible.
Diagnostics with a multimeter is the most accurate method. It is necessary to “ring” the relay windings. Resistance should be within certain limits (usually a few ohms), and not at infinity or zero. If the device shows a break, the part is clearly faulty.
Compatibility table and relay types
When searching for a spare part, it is important to consider that refrigerators Biryusa were equipped with different types of compressors and, accordingly, different relays. It is impossible to install an incompatible part - it simply will not connect to the contacts or will not work correctly.
| Relay type | Marking | Features | Compatibility |
|---|---|---|---|
| POSISTOR | PTC, RTK | Has no moving parts, works by heating the element | Modern Biryusa models |
| Induction | R-3, R-4 | With a moving core and coil | Old Soviet models |
| Combined | DHR, 33N4 | Combines starting and thermal protection | Models of the 90s, 2000s |
Pay attention to the number of contacts. There can be two, three or four. Three-contact relays are the most common in household refrigerators. If you buy a relay with two contacts instead of three, the circuit will not work.
When buying a new spare part, be sure to take the old relay or its photo with you. Salespeople in spare parts stores will help you choose an analogue if the original is no longer in production. The main thing is the coincidence of the seat and electrical parameters.
Replacement and performance check
The replacement process start relay in the refrigerator Biryusa is the reverse of the removal process. Install the new part onto the compressor contacts until you hear a characteristic click or stop. Make sure that it fits tightly and does not loosen.
Attach the fixing bracket or snap the tabs. Reconnect the wires if they were disconnected. Reassemble the structure in the reverse order: first put on the protective cover of the engine compartment, then screw the back metal panel.
After turning on the refrigerator, pay attention to the light in the room. If the light blinks when the compressor starts, but the refrigerator starts to work, then the starting current is normal. If the machine in the panel knocks out, perhaps the problem is deeper, for example, in the compressor itself.
It is important to let the refrigerator run for at least an hour before loading food. During this time, it should gain temperature and turn off at the command of the thermostat. If the cycle is successful, the repair can be considered complete.
Frequently asked questions and answers (FAQ)
Can an old relay be repaired or just replaced?
Theoretically, induction relays with a moving core can be disassembled and the contacts can be cleaned with fine sandpaper and put it back together. However, modern posistor relays cannot be repaired. Considering the low cost of a new spare part, repairing an old relay is often impractical.
Why does a new relay burn out after a short time?
If a new one starting relay burns out quickly, the reason may be an unstable voltage in the network or, worse, a malfunction of the compressor itself (jamming, short circuit of the windings). Also check whether the contacts are tight.
Where to buy a relay for the Biryusa refrigerator?
Spare parts can be found in specialized refrigeration equipment stores, on radio markets or ordered in online stores by article number. For older models, you may need to search at disassembly sites or service centers.
Is it safe to turn on a refrigerator without a relay?
Absolutely not. Turning on the compressor without a start relay will cause the engine to hum but not start. In a few seconds, the thermal protection will work or the winding will burn out, which will lead to expensive repairs of the compressor.