A sudden stop of the compressor or a characteristic click, after which the unit goes silent, often indicate problems with the electrical engine starting circuit. Owners of household appliances Biryusa often face the need to diagnose the starting mechanism, since it is this unit that takes on the main load each time the motor is turned on. Understanding where this element is physically located is the first and critical step in performing DIY repairs or replacing a failed part.
The location of the component is standardized for most models, but access to it may vary depending on the year of manufacture and the design of the rear wall. In most cases starting relay attached directly to the compressor housing, which is located in the lower rear part of the refrigerator. For a visual inspection, you do not need to dismantle the entire unit; it will be enough to provide access to the motor by removing the protective panel.
Before proceeding with active actions, you must turn off the power to the device by unplugging the power cord from the outlet. This is a basic safety rule and, if ignored, may result in electric shock or electronic damage. After turning off the power, you can begin to study the design of the motor-compressor and search for the required unit.
The design of the motor-compressor and the location of the starting unit
To determine exactly where the part you are looking for is located, you should understand the general architecture of the engine compartment. The compressor in refrigerators Biryusa is a sealed black tank, to the bottom of which several tubes and an electrical connector fit. It is in this electrical unit, often covered with a plastic or metal casing, that the desired element is hidden.
Directly on the output contacts of the compressor (usually there are three) a block is fixed into which two main components are inserted: a starting and a thermal relay. In old models they can be combined into one housing, in new ones they can be separate modules connected by wires or a contact group. Start relay responsible for short-term supply of voltage to the starting winding of the engine, ensuring its acceleration to operating speed.
⚠️ Attention: Do not try to forcefully tear off the plastic box covering the contacts. Plastic becomes brittle over time, and careless movement can lead to breakage of the fasteners, which will complicate further assembly.
Visually, the unit looks like a small cylinder or parallelepiped of black or white color, placed on pins coming out of the compressor. Often this element is marked by manufacturers, for example, RTK, R-1 or R-3, which indicates its type and compatibility with certain series of motors. If you see an element hanging on the wires next to the motor, it could also be a starting device moved to the side for better cooling, which is typical for some modifications.
Removing the protective casing and access to electrical
The process of gaining access to the insides of the electrical part of the motor requires accuracy and a minimum set of tools. You will need a flat head screwdriver and possibly some pliers. First, remove the back cover of the refrigerator, which covers the entire engine compartment. It is usually attached to several screws around the perimeter or fixed with latches.
After removing the cover, you will see a compressor with a cap placed on its contact group. This cap can be plastic or metal. To remove it, you need to carefully press out the fixing clips or unscrew the screw, if provided by the design. Some models Biryusa use a clamp that needs to be loosened.
When the casing is removed, the contact group itself opens in front of you. Start relay at this moment it is in your hands or hanging on the wires, being removed along with the cover. It is important not to yank the wires too harshly, as they may become dry and brittle. Inspect the condition of the insulation: if it is cracked, additional insulation will be required before installing a new element.
The relay itself is disconnected from the block by gently rocking it from side to side. It sits tightly on the contacts of the compressor, but is not screwed on. The main effort should be aimed at loosening, and not at pulling upward, so as not to damage the output pins of the motor itself, which can break off if handled carelessly.
Types of starting relays used in Biryusa refrigerators
In the refrigeration equipment of the brand Biryusa various types of starting devices have been used for decades. Understanding their differences is necessary for correct diagnosis and selection of replacements. The main division occurs into induction (electromagnetic) and posistor (thermal) relays.
Induction relays, such as series RTK or R-3, operate on the principle of electromagnetic induction. Inside them there is a coil and a movable core with contacts. When starting, the current is high, the magnetic field draws in the core, short-circuiting the starting winding. When the motor accelerates, the current drops, and the core, under the influence of gravity (that's why they are placed strictly vertically), opens the circuit.
Posistor relays, for example R-1 or PZK, use the property of a posistor to change resistance when heated. In a cold state, the resistance is low, the current flows to the starting winding. The posistor heats up, its resistance increases sharply, and the current practically stops. Such relays are less sensitive to position in space, but more inertial.
It is important to note that starting relay one type cannot always be replaced with an analogue of another type without changing the connection diagram or fastening design. Although they functionally perform the same task, their electrical characteristics and dimensions may differ. When purchasing a spare part, be sure to check the markings of the old device with the new part.
Fault diagnosis: symptoms and testing with a multimeter
Before buying a new part, you should make sure that this is where the problem lies. There are a number of characteristic signs indicating failure of the trigger mechanism. If the refrigerator Biryusa hums for 2-3 seconds, then a click is heard and there is silence - this is a classic symptom of a faulty starting circuit.
Another sign may be a situation where the compressor is hot, but does not start, or starts only after a long period of inactivity. Also, a malfunction is indicated by a burning smell in the area of the motor or visible traces of melting on the body of the relay itself. A visual inspection can immediately give an answer: if soot or melted plastic is visible inside the plastic case, the part definitely requires replacement.
For accurate diagnostics, use a multimeter switched to the continuity or resistance measurement mode. The removed relay must be disassembled (if the design allows) or called through the contacts. The resistance of the coil or posistor must be in a certain range, usually from several tens to hundreds of Ohms, depending on the model.
⚠️ Attention: If, when testing, the multimeter shows infinity (open) or zero (short circuit), the starting relay is faulty. However, remember that even a seemingly serviceable relay may not hold the load, so replacement is often made by elimination.
The test also includes testing the thermal relay, which often comes in pairs. If the bimetallic plate of the thermal relay is deformed or the contacts are burnt, the motor will also not be able to start, even if the starting device is working properly. Therefore, it is recommended to check the entire bunch of components at once.
Instructions for replacing the start relay with your own hands
Replacing a faulty part is a process accessible to any home craftsman with minimal technical skills. The main thing here is the sequence of actions and compliance with precautions. Before starting work, make sure that the refrigerator is unplugged for at least 15-20 minutes to allow the compressor to cool down.
First remove the old relay, as described in the dismantling section. Carefully disconnect the wires if they are connected through terminals, or simply remove the block from the compressor contacts. Pay attention to the orientation: the top and bottom of the relay are often marked with arrows or an inscription UP, which is critical for induction models.
☑️ Algorithm for replacing the relay
Installing a new one start relay is done in the reverse order. Place the device onto the compressor contacts until you hear a characteristic click or a tight fit. Make sure that the wires are not pinched or touching hot parts of the compressor or pipes. If the relay has screw terminals, tighten them securely to ensure good contact.
After installation, assemble the protective cover and secure it. Only after complete assembly can you plug in the refrigerator. The first start may be accompanied by a louder hum than usual, but after a few seconds the motor should return to operating mode and begin to work evenly.
Compatibility table and characteristics of popular models
When selecting spare parts for a refrigerator Biryusa it is important to take into account not only the appearance, but also the electrical parameters. Below is a table to help you navigate the main types of relays found in this technology.
| Relay type | Marking | Application | Features installation |
|---|---|---|---|
| Induction | RTK-1, RTK-1-3 | Compressors type KSh-140 | Strictly vertical, arrow up |
| Induction | P-3 | Powerful compressors | Requires precise vertical orientation |
| Posistor | R-1, PZK-1 | Modern models | Less sensitive to tilts |
| Combined | RTK-X-2 | Universal | Combines starting and thermal protection |
Using the wrong relay may result in the motor not starting or, conversely, not turning off the starting winding, which will cause it to burn out. Therefore accurate marking on the body of the old part is the main guideline when looking for a replacement in spare parts stores.
Is it possible to use a universal relay?
There are universal starting relays with a set of adapters. They are suitable for most compressors, but their reliability is often lower than that of original parts designed specifically for a specific series of Biryusa motors.
If you have not found an exact analogue, you can use a relay with similar characteristics, but this requires knowledge in electrical engineering to check the cut-off currents. In everyday conditions, it is better to look for a part with an identical manufacturer code.
Common mistakes during self-repair
Independent repair of refrigeration equipment involves risks that are often associated not with technical complexity, but with inattention. One of the most common mistakes is ignoring the orientation of the relay during installation. As already mentioned, induction relays only work in a certain position, and installing them “upside down” will lead to sticking of the contacts and burning of the winding.
Another error is poor contact at the connection point. If you haven't put the block on completely or the contacts have oxidized, this will create additional resistance. The contact point will begin to heat up, melt the plastic and ultimately lead to a new breakdown, perhaps more serious, affecting the compressor itself.
Also, novice repairmen often forget to check the condition of the compressor itself. If the motor is “stuck” mechanically, no amount of replacing the relay will help - it will hum and knock out the thermal protection. In this case, professional diagnostics or replacement of the compressor is required.
What to do if the new relay burns out immediately?
If after replacing the relay the refrigerator stops starting again and the new device fails, the problem is most likely deeper. Perhaps the compressor itself is faulty (turn-to-turn short circuit), the wiring going to the motor is broken, or the thermal relay is faulty, which does not protect the circuit. In this case, diagnostics with professional equipment is necessary.
Is it possible to temporarily start a refrigerator without a relay?
Theoretically, you can start the motor by applying voltage directly to the starting winding for a short time, but this is extremely dangerous and requires skills. Without a relay, the compressor can burn out in a matter of seconds. This method (“starting through a capacitor” or manually) is used only by experienced craftsmen for diagnostics and is categorically not recommended for constant use.
How often should the starting relay be changed?
The starting relay is a resource part, but does not have a strict expiration date. With stable network voltage, it can last 10-15 years or more. Frequent power surges, power outages, or overheating of the engine compartment (due to dust or poor ventilation) can reduce its service life to 3-5 years.
In conclusion, replacing the start relay in a refrigerator Biryusa is a very real task for home repairs. Knowing where this unit is located and understanding the principles of its operation will allow you to quickly return the equipment to life, saving money on calling a technician. However, if you doubt your abilities or the diagnosis indicates more complex breakdowns, it is better to contact a specialized service.