Sudden stoppage of the refrigerator Biryusa often becomes an unpleasant surprise, especially when there are perishable foods inside. In most cases, the cause of the breakdown is the failure of the start-up relay, which is responsible for starting the compressor and protecting the engine from overloads. Understanding where exactly this device is located and how it functions is the first step to successfully restoring the functionality of household appliances.
To carry out diagnostics and subsequent repairs, you do not have to call a technician right away, since the design of many models Biryusa allows independent maintenance. However, in this article we will analyze in detail the location of the relay, diagnostic methods and the algorithm of actions when replacing it.
Design and principle of operation of the start-up protection relay
The start-up protection relay is an electromechanical switch that supplies current to the starting winding of the compressor only in moment of engine starting. As soon as the motor rotor reaches the required speed, the relay opens the starting winding circuit, and the refrigerator continues to operate on the main winding. At the same time, the device performs a protection function: if the current in the circuit exceeds permissible limits, the thermal element opens the contacts, preventing the windings from burning out.
In refrigerators Biryusa two types of relays are most often used: posistor and induction. PTC models, such as RTK or P-1, work by changing the resistance of the temperature-sensitive element when heated. Induction, in turn, use an electromagnetic coil to open contacts. Understanding the type of your device is critical for the correct selection of spare parts.
The relay housing is usually made of heat-resistant plastic or carbolite and has special terminals for connecting wires. Inside there are moving contacts, springs and, in the case of induction models, a coil with a core. With prolonged use, the contacts can burn and the springs lose elasticity, which leads to sticking or, conversely, the inability to close the circuit.
⚠️ Attention: If you hear clicks when you try to start, but the compressor does not turn on, under no circumstances leave the refrigerator plugged in for a long time. This can lead to overheating and fire of the motor windings.
The location of the relay in various Biryusa models
The answer to the question of where the relay is on the refrigerator Biryusadepends on the year of manufacture and the specific modification of the unit. In the vast majority of cases, the starting protection device is attached directly to the compressor housing, which is located in the lower rear part of the refrigerator. To access it, you need to move the refrigerator away from the wall and remove the rear metal cover covering the engine compartment.
On older models, such as Biryusa-6 or Biryusa-8, the relay often has a black carbolite housing and is mounted on the side or top of the compressor using brackets or latches. More modern modifications, for example, series 133 or 355, use compact plastic relays that are simply put on three pins coming out of the compressor. Sometimes the relay can be combined with a capacitor into a single unit.
In two-compressor models, each compressor has its own start-protection relay. In this case, it is important not to confuse the devices, as they may have different electrical characteristics. Before removal, it is recommended to photograph the location of the wires and markings on the case, so that when installing a new element, you will not make mistakes in switching.
Signs of a faulty start-up protection device
Diagnostics of the fault begins with an analysis of the behavior of the refrigerator. If compressor it hums but does not start, or starts for a few seconds and immediately stalls with a characteristic click, this is a sure sign of a problem in the starting circuit. Also an alarming signal is the complete failure of the equipment to turn on when there is voltage in the socket.
Visual inspection of the removed relay often allows you to identify defects without the use of measuring instruments. Burnt contacts, a melted body, or the presence of burning inside the device clearly indicate the need for replacement. Sometimes the relay may look intact, but not perform its functions due to the loss of the posistor properties or jamming of the mechanism.
You should also pay attention to the temperature of the compressor housing. If the motor-compressor is hot but the refrigerator is not cooling, this may indicate that the relay does not open the starting winding and the engine is operating in emergency mode. In such a situation, the operation of the equipment must be stopped immediately to avoid an interturn short circuit.
- 🔊 The compressor hums for 3-5 seconds, then there is a click and silence.
- 🌡️ The motor housing gets very hot, although the refrigerator does not work.
- ⚡ When turned on the network knocks out circuit breakers or burns out plugs.
- 👃 The smell of burnt wiring or plastic in the engine compartment area.
⚠️ Attention: Do not try to repair the insides of the relay by stripping the contacts or gluing the housing. Such measures provide only a temporary effect and can lead to a fire. Use only new certified spare parts.
Tools and preparation for replacing the relay
To successfully replace the start-up relay, you will need a minimum set of tools that most men have in their home. The main tool will be a screwdriver (Phillips or flathead, depending on the fastening of the back cover and clamps). You may also need pliers to remove hard latches or terminals.
Before starting work, be sure to disconnect the refrigerator from the electrical outlet. This fundamental rule safety precaution, if ignored, may result in electric shock. Allow the compressor to cool for 15-20 minutes if it tried to start before, to avoid burns and more comfortable operation.
Prepare a workplace with good lighting in advance. You may need a multimeter to check the continuity of the new relay before installation, although in emergency cases you can do without it if you are confident that the new part is working. Have a rag on hand to remove dust and dirt from the compressor.
☑️ Preparing to replace the relay
Step-by-step instructions for dismantling and installation
The process of replacing the relay begins by removing the rear protective panel of the engine compartment. It is usually secured with four screws around the perimeter. After removing the panel you will see the compressor (black barrel) and the relay attached to it. Carefully remove the fixing bracket or plastic casing, if any.
The relay itself is removed by moving down and away from the compressor contact group. It is important not to use excessive force to avoid damaging the refrigeration pipes. If the relay is holding tightly, rock it slightly from side to side. Disconnect the wires suitable for the relay, having previously memorized or photographed their connection diagram.
Installation of a new element is carried out in the reverse order. Align the holes in the relay housing with the compressor pins and press firmly until a characteristic click or stop occurs. Make sure that the marking UP (top) on the relay body coincides with the actual position, since incorrect orientation may disrupt the operation of the mechanism.
| Operation stage | Action | Important nuance |
|---|---|---|
| 1. Access | Remove the back cover | Do not lose the fastening screws |
| 2. Removal | Remove the bracket and remove the relay | Act carefully, do not pull the wires |
| 3. Switching | Move the terminals to a new relay | Make sure the contacts match |
| 4. Installation | Install the relay on the compressor | Check the tightness and orientation |
What to do if the new relay does not fit in size?
Sometimes manufacturers change the design, and the new relay may have different mounting dimensions holes. In this case, you can carefully bend the metal mounting bracket using pliers so that it fits tightly around the new housing. The main thing is to ensure reliable fixation so that the vibration of the compressor does not break the contacts.
Diagnostics and testing with a multimeter
If you have a multimeter, you can make sure that the new relay is working properly before installation or check the old one to confirm the diagnosis. Switch the device to resistance measurement mode (Ohms). To check a posistor relay, it is necessary to measure the resistance between the contacts to which the starting winding is connected.
The normal resistance of a working posistor at room temperature is usually several ohms (often in the range of 10-50 ohms, the exact data depends on the model). If the device shows infinity (open) or zero (short circuit), the relay is faulty. It is also worth checking the thermal protection: it should “ring” in a cold state.
When checking the induction relay, the coil resistance should also be small. It is important to check not only the electrical conductivity, but also the mechanical mobility of the contacts, if the relay design allows this. However, even if the tester shows normal, the relay may not hold the load, so replacement based on symptoms is often a more reliable method.
Common mistakes during self-repair
One of the most common mistakes is ignoring the reason for the failure of the old relay. If the compressor has a turn-to-turn short circuit or a mechanical problem, the new relay will burn out after a few minutes or even seconds of operation. Therefore, if after replacement the situation repeats, the problem lies deeper.
Another mistake is incorrect installation of the terminals. Mixed-up wires can cause the starting winding to remain on constantly, which will cause rapid overheating and humming of the motor. Always check the diagram on the terminal box cover or in the instructions for the specific model Biryusa.
Some craftsmen try to “revive” the old relay by tapping or shaking. It may help to start the refrigerator once to unload food, but it is strictly forbidden to operate the equipment in this mode. The service life of such a “repair” is calculated in minutes, and the risk of fire increases many times over.
⚠️ Attention: Technical characteristics of compressors and relays may vary even within the same line of refrigerators. Always check the markings on the nameplate of your device with the data on the new spare part before purchasing.
Questions and answers (FAQ)
You can Is it possible to start a Biryusa refrigerator without a relay?
Theoretically, you can start a compressor without a relay by forcibly applying voltage to the starting winding, but doing this in a domestic environment is extremely dangerous. The compressor will be left without thermal protection, which in case of any malfunction will lead to its combustion or fire. Operating a refrigerator without a relay is prohibited.
How often do you need to change the relay in a refrigerator?
The start-up protection relay is a consumable item, but its resource is quite long. With stable mains voltage, it lasts 5-10 years or more. Frequent replacements (once a year or more often) indicate problems with the electrical wiring in the house or a malfunction of the compressor itself.
Where to buy an original relay for Biryusa?
Original spare parts can be found in specialized refrigeration equipment stores or official service centers. However, for most models, universal analogs are suitable (for example, RKT, R-1, DR-1), which are sold in radio parts stores and on marketplaces.
Why did the new relay burn out immediately after installation?
If the new relay burned out instantly, most likely the compressor itself is faulty (interturn short circuit, piston wedge groups) or strong power surges occur in the network. Also, the cause could be an error when connecting the wires to the terminals.