A sudden stop of the refrigerator Biryusa or the appearance of a characteristic hum without starting the engine often signals a failure of the starting mechanism. It is the relay that is responsible for starting the electric motor and protecting it from overloads, so if this unit breaks down, the compressor either does not turn on at all or works intermittently. Replacing or diagnosing this element is one of the most common procedures in household repairs, which you can handle yourself with a minimal set of tools.
Before starting any work, you must completely de-energize the unit by unplugging the plug from the socket. The mains voltage is 220 volts dangerous to life, and the capacitors inside can retain some charge time. Access to the compressor is usually located from the rear side of the case, where the radiator grille and the motor-compressor itself are located, often covered with a metal or plastic casing.
In this article we will look in detail at how to properly dismantle start-up protection relaywhat to look for when inspecting it and how to avoid common mistakes. Understanding the design of the unit will help you not only replace the part, but also accurately diagnose the cause of the malfunction, eliminating more serious problems with the motor windings.
⚠️ Attention: If after removing the relay you see melted contacts, blackened plastic or smell a burning smell, do not under any circumstances try to clean the contacts sandpaper and put the part back. This is a temporary measure that can lead to jamming of the compressor.
Design of a starting relay in Biryusa refrigerators
The starting relay in refrigerators Biryusa is a compact block that fits directly onto the three contact pins of the compressor. Inside the case there may be one common device or two separate elements: a starting and a thermal (protective) relay. In older models, relays with a heavy copper core are often found, in new ones there are lighter versions with a posistor.
The principle of operation is based on applying a short-term high voltage to the starting winding of the motor. As soon as the rotor reaches the required speed, the mechanism opens the starting winding circuit, and the engine continues to operate only on the working winding. Thermal relay at this time it monitors the current strength: if it exceeds the norm (for example, when the pistons jam), the circuit breaks completely, preventing the motor from burning out.
It is important to understand that different models Biryusa can be equipped with relays from different manufacturers, such as Danfoss, Seco or Indesit. Despite the external differences, the principle of their connection and removal remains almost identical. The key point is the correct orientation of the part relative to the piston group of the compressor.
What is the difference between a posistor and induction relay?
Induction relays (old type) have a movable core and click when operating. Posistor (modern) ones work by changing the resistance of the crystal when heated and have no moving parts, working silently, but have a limited life of switching cycles.
Necessary tools and preparation of the workplace
To perform the work efficiently, complex professional equipment is not required. A basic DIY kit, which most men have, is enough. The main thing is to ensure good lighting of the work area, since the space behind the refrigerator is often dark.
You will need the following tools:
- 🔧 Flat-head screwdriver (for removing clamps and the cover).
- 🔧 Phillips screwdriver (if the casing is secured with screws).
- 🔧 Pliers or pliers (for removing clamps).
- 🔧 Multimeter (for checking the integrity of windings and contacts).
- 🔧 Flashlight (for illuminating hard-to-reach places).
Before you start unscrewing the bolts, Make sure the refrigerator is stable. If the model is heavy, it is better to call an assistant to slightly tilt the body without damaging the floor or legs of the unit. Also prepare a clean rag to wipe the compressor from dust that may interfere with your view.
☑️ Ready for repair
Access to the compressor and removal of the protective casing
Compressor in refrigerators Biryusa located in the lower rear part of the case. It is covered with a metal or plastic casing, which protects mechanical parts from dust and accidental damage, and also reduces noise levels. To remove the relay, you first need to dismantle this protection.
The casing can be attached in several ways: with screws, with latches or with clamps. In most cases, it is enough to unscrew a few screws around the perimeter or loosen the clamps with pliers. Be careful, the edges of the metal casing may be sharp, so work carefully to avoid injury.
After removing the cover, you will be presented with a view of the compressor - a black “tank” with matching copper pipes. The relay is attached to the side terminal of the compressor. Sometimes wires connected to the relay are secured with plastic clips or electrical tape. They must be carefully released so that nothing interferes with the removal of the part.
⚠️ Attention: Do not apply excessive force to the copper pipes coming out of the compressor. They are thin-walled and can burst if strongly bent, which will lead to a freon leak and require expensive repairs at the service level.
Technology for removing the relay from the compressor contacts
The process of removing the relay itself requires accuracy and understanding of the mounting design. The relay fits onto three pins of the compressor and is often additionally secured with a metal bracket or bar that presses it against the motor housing. This bar prevents vibration and contacts from moving away during operation.
Procedure for dismantling:
- 🛑 Inspect the fastening: find a metal bracket or spring clip covering the relay.
- 🛑 Carefully bend or remove the retaining bar. In some models Biryusa it is held on by a screw, in others it is simply hooked to the body.
- 🛑 Take the relay with both hands (or one hand by the body, holding the compressor with the other) and with rocking movements from side to side, remove it from the pins.
- 🛑 Do not pull the relay by the wires! This can break the internal connections or damage the insulation.
If the relay fits very tightly and cannot be removed by hand, you can slightly help yourself with a flat screwdriver by prying up the housing at the junction with the compressor, but this must be done extremely carefully so as not to split the plastic housing of the parts. Contact groups the inside is fragile, and careless movement can damage it destroy.
Diagnostics and checking the removed element
After the relay has been removed, it is necessary to conduct a visual inspection and, if possible, check it with a multimeter. Shake the part near your ear: if a knock is heard inside, it means that the mechanical part (core or contacts) is destroyed, and the relay must definitely be replaced.
When inspecting it externally, pay attention to the condition of the plastic. The presence of cracks, melting or burning marks indicates overheating, which could occur due to poor contact or overcurrent. Also check the condition of the contacts inside: they should be clean, free of oxides and carbon deposits.
To check with a multimeter, switch the device to the dialing mode. Check the thermal relay circuit: in a cold state it should ring (be closed). The starting relay is checked depending on the type: the inductive relay must close at a certain position, and the posistor must have a certain resistance (usually several tens of Ohms), which increases when heated.
| Type of fault | External signs | Multimeter readings | Actions |
|---|---|---|---|
| Thermal relay is broken | The refrigerator does not turn on | No bell (infinity) | Replacing the relay |
| Sticking contacts | Buzzing, knocking out plugs | There is a ringing, but the contacts do not open | Replacing the relay |
| The posistor is destroyed | Clicks, no start | Resistance does not change or is equal to 0/infinity | Replacing the relay |
| Oxidation of contacts | Unstable operation | There is resistance, but high | Cleaning or replacement |
Installing a new relay and assembling the system
Installation of a new relay is carried out in the reverse order of removal. It is important to select a part with exactly the same markings or a complete analogue in terms of characteristics. The relay marking must strictly correspond to the power and type of compressor of your Biryusa refrigeratorotherwise the protection system will not work correctly.
Place the relay on the three pins of the compressor, observing the correct orientation (usually indicated by an arrow UP or TOP on the relay body). Make sure that the part is seated tightly and all the way. After this, return the fixing bracket or strip into place, securely fastening the assembly.
Connect the wires to the terminals according to the photograph or color marking taken earlier. Lay the wires so that they do not touch the hot parts of the compressor and are not pinched by the housing. Return the protective casing to its place and secure it with screws or clamps.
⚠️ Attention: Compressor specifications and relay requirements may vary depending on the year of manufacture of the refrigerator. Always check the markings of a new part with the documentation or label on the old relay, since the manufacturer may change the equipment.
Common mistakes and recommendations from specialists
When repairing things on their own, beginners often make mistakes that can lead to repeated breakdowns. One of the most common is an attempt to install the relay “by eye” without fixing it with a bracket. Compressor vibration quickly loosens the contacts, sparking occurs, and the relay burns out in a few days.
Another mistake is ignoring the condition of the compressor pins themselves. If they are oxidized or burnt, the new relay will not last long. Before installation, it is recommended to carefully clean the pins with fine sandpaper (zero) to a metallic shine, having previously de-energized the unit.
Also, you should not use a relay from other models of refrigerators, even if it physically fits in size. The characteristics of cut-off currents and response times may differ, which will lead to either frequent false shutdowns or burnout of the motor windings. Saving on this part or careless installation can lead to failure of the most expensive component of the refrigerator. Biryusa.
Is it possible to repair an old relay if it is burnt out?
In most cases, repairing a burnt out relay is impractical. The plastic of the case is deformed by temperature, and the contacts burn out. Attempts to clean the contacts have a short-term effect, after which the relay fails again, risking damage to the compressor. It’s easier and safer to buy a new one.
Why does the new relay click, but the refrigerator does not freeze?
If the relay clicks, but there is no start, the problem may not be in the relay, but in the compressor itself (interturn short circuit, wedge of the piston group) or in the absence of freon. It is also worth checking the integrity of the motor windings with a multimeter.
How often do you need to change the relay in the Biryusa refrigerator?
The service life of the starting relay is on average 3-5 years of active use, but a high-quality part can last 10 years. Replacement is required only if signs of a malfunction appear: refusal to start, frequent clicks or overheating of the unit.