Refrigerators Biryusa are deservedly considered one of the most reliable units on the domestic market, however, even such time-tested equipment can fail. Most often, owners are faced with a situation where the engine stops starting, hums, but does not pump freon, or is completely silent when plugged in. In these cases, the first suspect becomes compressor the heart of the refrigeration unit, which ensures the circulation of the refrigerant.
Before calling a technician or buying a new part, it is necessary to conduct competent diagnostics to understand whether there is really a problem lies in the engine, or the fault lies in the start relay, thermostat or wiring. Incorrect diagnosis can lead to unnecessary financial costs, while the solution to the problem could be much simpler.
In this article we will analyze in detail the algorithm of actions for checking the refrigerator compressor Biryusa, consider methods for measuring winding resistance, testing the start-protective relay and assessing the mechanical part of the motor. You will learn what tools you will need for the job and how to safely carry out all the necessary measurements.
Primary visual diagnostics and preparation
Any work with electrical appliances begins with ensuring safety. Before touching the internal components of the refrigerator Turk, be sure to disconnect it from the power supply. This criticallysince checking the compressor involves working with conductive elements. If the unit has just been running, allow it to cool for 15-20 minutes.
Inspect the back wall of the refrigerator. In models Biryusa the compressor is usually located in the lower niche and covered with a casing. Remove the protective panel to gain access to the motor. Visually assess the condition of the case: there should be no dents, signs of strong heating or oily smudges. The presence of oil around the tubes may indicate depressurization of the system, which often accompanies compressor failure.
⚠️ Attention: If you notice obvious traces of burning wiring or melted plastic on the terminals, do not try to immediately turn on the device. First you need to replace damaged wiring elements and the start relay.
Pay attention to the tubes coming out of the compressor. When the engine is running, the suction tube should be cold and the discharge tube should be hot. If, after turning on, the refrigerator is silent and the compressor does not make any sounds, this may indicate an open circuit or a malfunction of the control electronics.
To carry out high-quality diagnostics, you will need a minimum set of tools. Without them, the test will be superficial and will not give an accurate result.
- 🔧 A multimeter (tester) is the main device for measuring resistance and checking the integrity of circuits.
- 🔧 Screwdrivers (phillips and flat) - for removing the casing and dismantling the relay.
- 🔧 Pliers - for careful removal of terminals.
- 🔧 Insulating tape or heat shrink - for insulating contacts after checking.
Checking the starting and protective relay
Often the reason is that the refrigerator compressor Biryusa is not starts, it is not the motor itself, but a faulty starting relay. This small element is responsible for supplying a starting pulse to the motor winding and protecting against overloads. In older models Biryusa relays of the RT, RTP or R-1 type are often used, which wear out over time.
First, the relay must be removed. It is attached directly to the compressor terminals and fixed with a bracket or simply put on the contacts. Carefully disconnect the wires and remove the relay housing. A visual inspection can immediately identify the problem: if soot, melted plastic, or a burning smell is visible inside, the part requires replacement.
Checking the serviceability of the relay is carried out using a multimeter in continuity mode. You need to “call” your contacts. If the device shows infinite resistance where there should be a circuit, or vice versa - a short circuit, the relay is faulty. Pay special attention to the thermal release: in a cold state, its contacts must be closed.
How does the starting relay work?
The principle of operation is based on heating a bimetallic plate or triggering an electromagnet. When starting, the current is high, the relay closes the starting winding circuit. When the engine picks up speed, the current drops and the relay opens the starting winding circuit, leaving only the main winding working. If this mechanism jams, the compressor hums, but does not start.
If the relay is working properly, but the compressor still does not start, the problem may be deeper. However, refrigerator repair statistics Biryusa show that replacing the relay solves the problem in every third case.
- 🔌 Dismantle the relay by disconnecting the wires and removing the fixing bracket.
- 🔌 Shake the relay: if a rattling sound is heard inside, the core or contacts may have broken.
- 🔌 Test the circuit between the contacts with a multimeter: the resistance should be zero (short circuit) in a cold state.
Measuring winding resistance with a multimeter
The most accurate way to check the electrical part compressor is to measure the resistance of its windings. To do this, you need to gain access to the motor contact group by removing the starting relay. At the end of the compressor you will see three leads forming a triangle. Usually they are marked with letters or symbols, but if the marking is erased, you need to determine their purpose.
Refrigerators Biryusa use single-phase asynchronous motors with two windings: working (main) and starting. The third contact is common. The resistance between these contacts has strictly defined values. The working winding always has less resistance than the starting winding, since it is wound with a thicker wire.
Take a multimeter, put it in resistance measurement mode (limit 2000 Ohms or 2 kOhms). Touch the probes to the pairs of contacts. You need to get three values: between the first and second, second and third, first and third contacts. The sum of the two smaller values must equal the largest value.
Calculation example:R(1-2) = 20 Ohm
R(2-3) = 15 Ohm
R(1-3) = 35 Ohm
Conclusion: Contact 2 is common, 1-2 is the starting winding, 2-3 is the working winding.
Sum 20 + 15 = 35. The circuit is intact.
If the multimeter shows one (infinity) on any pair contacts, this indicates a winding break. Such a compressor cannot be repaired and requires replacement. If the resistance is close to zero on all pairs, it means that an interturn short circuit has occurred.
Normal resistance values may vary depending on the power of the motor and the model of the refrigerator Biryusa. Below is a table with indicative data for common types of compressors.
| Winding type | Resistance range (Ohm) | Nature of malfunction |
|---|---|---|
| Working (Main) | 10 - 25 Ohm | Open circuit or short circuit during deviation |
| Starting | 20 - 45 Ohm | Open circuit or short circuit during deviation |
| Between the body and contacts | Infinity (∞) | Breakdown to the body |
| Total resistance | Sum of working and starting | Sum mismatch |
Insulation breakdown test (short circuit to housing)
One of the most dangerous malfunctions is breakdown of winding insulation on the compressor housing. In this case, the current goes to the “ground”, which can lead to electric shock when touching the metal parts of the refrigerator Biryusa. It is necessary to check for breakdown before any start of the engine.
To carry out the test, switch the multimeter to the resistance measurement mode at the maximum limit (usually 200 kOhm or 2 MOhm). Press one probe to any of the three contacts on the compressor, and the second to a cleaned place on the metal body of the motor (you can use the relay mounting location or any unpainted part).
If the device shows a resistance close to infinity, the insulation is intact. If you see any resistance values (even hundreds of kOhms), this is an alarming signal. Ideally, the arrow or number should not move. The presence of conductivity between the winding and the housing means that the compressor faulty and its operation is prohibited.
⚠️ Attention: Even if the compressor starts, but has a breakdown in the housing, its use is deadly. Leakage current can activate an RCD, but you cannot rely on this - always check the insulation before installing a used motor.
Sometimes a breakdown only appears when heated or vibrating. If there is no breakdown when it is cold, but the machines knock out during operation, the defect may be hidden. In such cases, compressors Biryusa are often replaced preventively, since restoring the insulation inside the sealed housing is impossible.
- ⚡ Set the multimeter to the maximum resistance measurement limit.
- ⚡ Clean a small area on the compressor housing to the metal.
- ⚡ Press one probe to the contact, the other to the body.
- ⚡ Repeat the procedure for all three contacts.
Mechanical check: jamming and pressure
Electrical serviceability of the compressor is not yet guarantees its normal operation. The mechanical part is also subject to wear. In refrigerators Biryusa with a long service life, jamming of the piston group or wear of the valves is often encountered. If the motor hums, but does not start, and the windings are intact, most likely the problem is in the mechanics.
You can check the ability of the compressor to create pressure by disconnecting the capillary tube and the discharge tube. However, this requires freon-conducting equipment and skills. An easier way is the “palm test”. When you turn on a working compressor (for a short time!), you should feel a strong flow of air from the discharge outlet, which is difficult to block with your palm.
If the compressor makes a dull metallic knock or strong vibration, this may indicate a collapse of the connecting rod-piston group or a valve separation. In this case, the unit will operate very noisily and will not create the necessary pressure for cooling. Repairing the mechanical part at home is impossible due to the need for hermetically sealed soldering and vacuuming of the system.
☑️ Checklist for mechanical diagnostics
It is also worth checking the condition of the shock absorbers on which the compressor is mounted. In models Biryusa these are rubber washers or springs. If they dry out or burst, the vibration is transmitted to the refrigerator body, creating a strong noise, which can be mistaken for a motor breakdown.
Analysis of operation in various modes
The behavior of the compressor in different operating modes provides important information about its condition. Refrigerators Biryusa can be equipped with different types of control: a mechanical thermostat or an electronic module. The nature of the malfunction often depends on the type of control.
With mechanical control, if the thermostat is closed, 220V is immediately supplied to the compressor. If at this moment a hum is heard, but there is no start, and after a few seconds a click is heard (the thermal protection is triggered), this is a classic sign of a jammed or faulty start relay. If the engine starts, runs, but does not cool, there is probably a freon leak or loss of compressor performance.
In models with electronic control and inverter compressors, diagnostics are more difficult. Inverter motors Biryusa do not have a starting relay in the classical sense. They start smoothly. If such a compressor does not start, the problem may be in the control unit (inverter), and not in the motor itself. Testing an inverter compressor requires special equipment to measure the waveform.
Pay attention to the cyclical operation. A working compressor should work for a certain time, then turn off. If the operating cycle is too short (for example, 1 minute on, 1 minute off), this may indicate overheating or incorrect setting of the thermostat, which leads to rapid wear.
Frequently asked questions (FAQ)
Is it possible to replace the compressor on the Biryusa refrigerator with an analogue from another manufacturer?
Yes, it is often possible to install analogues from brands Atlant, Danfoss or Secop. The main thing is the coincidence of geometric dimensions, power and type of refrigerant (R134a or R600a). However, for proper operation, it may be necessary to replace the filter drier and adjust the length of the capillary tube.
Why is the compressor hot to the touch, but the refrigerator does not freeze?
Strong heating of the compressor in the absence of cold usually indicates that the motor is running “idle”. This may be caused by a freon leak (the compressor pumps air), a clogged capillary tube, or loss of compression of the piston rings themselves inside the motor.
How much does it cost to diagnose and replace a compressor in the service?
The cost of work varies depending on the region and model. Diagnostics usually costs less than the replacement itself. When you independently purchase a compressor for Biryusy the price of the part can range from 3,000 to 6,000 rubles, not counting the cost of work and consumables.
Is it possible to resuscitate a jammed compressor?
There is a method of “wedging” by applying increased voltage or a pulse from the capacitor, but it is effective only in cases of slight jamming and carries the risk of final failure of the windings. For modern hermetic compressors Biryusa it is more reliable and safer to replace the unit.