Refrigerators Biryusa are deservedly considered reliable equipment that can operate for years without serious failures. However, even time-tested units have breakdowns, and one of the most common problems is the failure of the start-up relay. This small part is responsible for starting the compressor and protecting the engine from overloads, so its malfunction instantly stops the cooling process.
If you notice that your the refrigerator has stopped freezing, but the light is on inside, and the motor hums for only a few seconds and clicks, most likely the problem lies in this component. Replacing a relay yourself is a completely feasible task for a home craftsman and does not require complex special tools. The main thing is to strictly follow safety precautions and the sequence of actions so as not to damage the expensive compressor.
In this article we will look at how to diagnose a breakdown, what tools will be needed for the job and how to correctly install a new part in refrigerators of various models. Biryusa. We will also look at the differences between types of relays and tell you what to look for when purchasing spare parts so that the repair is successful the first time.
Diagnosis of a faulty starting relay
Before disassembling the refrigerator and buying new spare parts, you need to make sure that the problem really lies in the starting relay mechanism. Symptoms of malfunction are often similar to a compressor breakdown, so it is important to conduct a careful initial diagnosis. Usually the owner notices that the unit turns on, a characteristic hum of the motor is heard, which ends abruptly with a click, followed by a pause before the next attempt to start.
⚠️ Attention: If, when turning on the refrigerator, the automatic switch in the panel is knocked out or a strong crackling sound and a burning smell are heard, immediately disconnect the device from the network. Operation in this condition may result in a wiring short circuit or fire.
A more accurate check will require a visual inspection and possibly a multimeter. Remove the rear cover at the bottom of the unit where the compressor is located. Carefully remove the box with the wires going to the motor and remove the relay itself. Carefully inspect the case: if black spots or cracks are visible on the plastic, the part definitely requires replacement. It is also worth shaking the relay next to your ear: if a ringing is heard inside, it means that the core or contacts have broken, which makes the device impossible to operate. traces of melting, black spots or cracks, the part definitely requires replacement. It is also worth shaking the relay next to your ear: if a ringing is heard inside, it means that the core or contacts have broken, which makes the device impossible to operate.
Using a multimeter allows you to check the integrity of the windings and contacts. Switch the device to dialing mode and check the findings. If the circuit does not ring where it should, or, conversely, rings constantly (short circuit), the relay is faulty. Remember that even if outwardly the part looks intact, the internal contacts could oxidize or burn, which disrupts the normal operation of the starting winding motor.
Necessary tools and preparation of the workplace
Replacing the relay in the refrigerator Biryusa is an operation that does not require professional equipment, but having the right set of tools will greatly simplify the task and keep you safe. First of all, you will need multimeter to check the circuit that we talked about above. Without it, it is difficult to guarantee that the new relay is working properly, and the old one is really out of order.
For mechanical removal and installation of parts you will need:
- 🛠️ Pliers or pliers with narrow jaws - necessary for removing and installing fixing staples, which often fit very tightly.
- ✂️ Side cutters - may be required for carefully cutting old wires if the terminals are damaged by corrosion.
- 🔧 Screwdrivers (cross and flat) - for dismantling the protective cover compressor and removing clamps.
- 🧤 Dielectric gloves - a mandatory safety element when working with electrical appliances.
- 📸 Smartphone - take a photo of the wire connection diagram before disconnecting them. This will help avoid errors during assembly.
Prepare the workplace: provide good lighting in the compressor area. If the refrigerator is built into the kitchen unit, it will have to be pulled out completely. It is also important to let the unit stand disconnected from the network for at least 15–20 minutes before starting work, so that the capacitors discharge and the heated elements cool down.
☑️ Preparation for repair
Selecting a suitable starting relay
Refrigerators Biryusa are equipped with compressors from different manufacturers (most often these are Atlant, Danfoss or Secop), so the relays for them may differ. An incorrectly selected part will not only not start the engine, but can also burn the compressor windings. The main difference lies in the type of device: they are induction (with a coil) and thermal (with a bimetallic plate), as well as combined.
When choosing a new spare part, be guided by the markings on the body of the old relay. Key parameters that must match:
- ⚡ Motor power (indicated in watts or horsepower, for example, 1/5 HP, 1/4 HP).
- 🔌 Type connection (location of contacts and their number).
- 🏭 Compressor model (often indicated in the technical documentation or on the nameplate of the motor itself).
- 📏 Overall dimensions (it is important that the relay fits tightly into the mounting bracket).
Often on the relay Biryusa you can find markings RT, R-3, R-4 or imported analogues of type PTC. If you are not sure of compatibility, it is better to take the old part with you to the store or order an original analogue according to the refrigerator model code. Universal relays exist, but they require precise tuning or may work less consistently in the long term.
Can a relay from another brand be used?
Yes, you can if the electrical characteristics and mounting geometry match. For example, relays from Atlant refrigerators are often suitable for Biryusa with similar compressors. The main thing is to match the power and type of trigger (PTC or induction).
Removing the old relay and installing a new one
The replacement process begins with completely disconnecting the refrigerator from the power supply. Unplug the cord from the outlet and move the unit so that you have free access to the rear wall. Remove the cardboard or plastic cover covering the compressor compartment. You will see a view of the black “tank” of the motor with a box attached to the side or top - this is our desired relay.
Sequence of actions for dismantling:
- Take a photo of the wiring diagram to the relay and compressor terminals.
- Carefully remove a retaining bracket or bar that presses the relay to the compressor housing. It can be held on by a spring or screws.
- Remove the relay from the compressor pins. It can be removed by gently rocking; there is no need to pull with force.
- Disconnect the wires going to the relay. If they are secured to the terminal block, carefully remove them. If the wires are soldered or crimped, they will have to be cut (leaving a margin for connection).
Installing a new relay is done in the reverse order. Insert the relay leads onto the pins of the compressor (usually there are three of them: common, starting and working). Make sure the relay is seated tightly and all the way. Secure it with a bracket. Now the most important thing is connecting the wires. If you cut the wires, connect their ends to the new relay using twisting followed by soldering or special terminal blocks. Insulate the joints with heat shrink or electrical tape.
⚠️ Attention: It is strictly forbidden to turn on the refrigerator with uninsulated wires or without the compressor protective cover installed. This may result in electric shock or moisture entering the contacts.
Connection diagram and operation check
Correct connection is the key to successful repair. Most models Biryusa use a standard circuit, but double-checking the markings on the new relay will not hurt. Typically, contacts are designated by letters or numbers: M (Main/Working winding), S (Start/Start winding) and C (Common/General). An error in the connection can cause the compressor to hum, but not start, or burn out immediately.
Below is a table of contact correspondence for common types of relays:
| Contact on the relay | Designation | Connection to the compressor | Function |
|---|---|---|---|
| 1 | C (Common) | Common wire | Power supply |
| 2 | S (Start) | Starting winding | Starting the engine |
| 3 | M (Run) | Working winding | Main work |
| Housing | PE | Grounding (if any) | Protection |
After assembling the entire electrical circuit, visually check all connections again. Make sure that the wires do not touch hot parts of the compressor and are not pinched. Only now can you turn on the refrigerator. In the first seconds you will hear a characteristic start-up click, and the engine should start smoothly, without extraneous vibrations. If after 10-15 minutes of operation the compressor begins to cool (become warm, but not hot), and cold appears in the chamber, then the replacement was successful..
Typical replacement mistakes and safety measures
Even experienced craftsmen sometimes make mistakes that can negate all efforts. One of the most common problems is installing a relay that is not suitable for power. If you take a part for a less powerful motor, it will burn out after a few cycles. If for a more powerful one, it will not start the compressor, which will work “pull-in”, which will reduce its resource.
The condition of the terminals on the compressor itself is also often ignored. If the pins are oxidized or burnt, the new relay will not make reliable contact with them. In this case, you need to carefully clean the contacts with fine sandpaper or a file, trying not to damage their geometry.
Do not forget about the precautions:
- 🚫 Do not work with wet hands and do not stand on a wet floor when the device is plugged in.
- 🔥 Beware of the tubes: behind the refrigerator there is a thin copper tube (capillary or discharge). It can easily be damaged by a tool, which will lead to freon leakage and expensive repairs.
- 🧊 Do not touch the evaporator: inside the chambers there are also fragile elements that should not be damaged.
If after replacing the relay the refrigerator works, but after a while it turns off again with a click; perhaps the problem is deeper: the compressor itself is faulty (interturn short circuit) or the thermostat. In this case, it is better to stop self-repair and call a specialist.
⚠️ Attention: Damage to the copper pipeline due to careless work will lead to the release of refrigerant. Self-filling with freon requires evacuation of the system and special equipment, which cannot be done at home without skills.
Is it possible to temporarily start a refrigerator without a relay?
Technically, you can start an asynchronous compressor motor by applying voltage directly to the working and starting windings using a button or manually, but doing this is strictly not recommended. Without a start relay, the compressor will not receive overload protection and may burn out in a few minutes. In addition, manual starting is dangerous for the life of the master.
Why did the new relay burn out immediately after installation?
Most often this indicates that the problem was not in the relay, but in the compressor. If the motor is “heavy” (tight stroke of the piston group) or has an interturn short circuit of the windings, it consumes increased current, which melts the contacts of the new relay. Also, the cause may be an incorrect connection diagram.
How often do you need to change the relay in the Biryusa refrigerator?
The starting relay is a part with a limited resource, but usually it lasts as long as the compressor itself (10–15 years). Frequent replacements (once a year or more often) indicate unstable voltage in the network or wear and tear on the motor. In such cases, it is recommended to install a voltage stabilizer.
What is the difference between the RT and R-3 relays?
The RT (thermal) and R-3 (often inductive or combined) relays differ in their operating principle and current characteristics. RT opens the circuit when the bimetallic plate is heated by current, and R-3 can use the electromagnetic principle. They are not always interchangeable without changing the connection diagram.
The compressor hums after replacing the relay, but there is no cold. What to do?
If the engine hums but does not start (a steady hum is heard without changing to a working rhythm), the compressor piston may have jammed or the starting capacitor has failed (if it is in the circuit). It is also worth checking whether the wires are connected to the windings correctly. Long-term operation in this mode is dangerous for the engine.