An unexpected stop of operation of refrigeration equipment always becomes an unpleasant surprise, especially when there are perishable products in the chamber. If you notice that the compartments have become warm, and the motor does not make the usual startup sounds, or it hums, but does not cool, then there is a high probability of failure of the main system unit - compressor. For owners of domestically produced equipment, such as Biryusa, independent primary diagnostics can be an excellent way to understand the scale of the problem and avoid wasting money on calling a technician for a simple inspection.
In this article we will go into detail We will analyze an algorithm of actions that will allow you to determine with a high degree of probability the serviceability of the electric motor. We will look at methods of visual inspection, checking the integrity of the windings using a multimeter, and methods for detecting a breakdown on the housing. It is important to understand that electrical safety is priority number one, therefore all manipulations are carried out exclusively with the device disconnected from the network.
Before taking active steps, it is necessary to exclude other, less complex reasons for the lack of cold. Sometimes the problem lies not in the motor itself, but in the control system or thermoregulation. However, if you have already made sure that the light in the chamber is on, and the compressor is silent or behaves inappropriately, then it’s time to arm yourself with tools and begin diagnosis the heart of your refrigerator.
Initial visual inspection and analysis of symptoms
Any high-quality diagnostics begins long before you pick up measuring instruments. Careful observation of the behavior of the unit and its appearance can provide up to 50% of the necessary information. First of all, pay attention to the nature of the noise: if the motor hums for several seconds, and then a click is heard and silence sets in, this is a classic sign that start relay is trying to start a jammed mechanism or a motor with an interturn short circuit.
Inspect the back wall of the refrigerator where the condenser is located the coil and the compressor itself. If you see melted plastic on the motor housing, traces of burning or soot on nearby parts, this indicates overheating. Often the cause is an insulation breakdown or prolonged operation in overload mode. It is also worth checking the condition of the electrical cable going to the node: it should not have cracks, melts or signs of rodent bites, which sometimes happens in private homes.
⚠️ Attention: If you smell a strong smell of burnt insulation or see sparking when turned on, immediately stop trying to start. The operation of such equipment is a fire hazard and requires a complete replacement of the unit.
Another important symptom is the temperature of the housing of a working (or trying to work) compressor. Normally, it should be warm or hot (up to 70-90 degrees), but not hot to the point where it is impossible to touch. If the motor Biryusa heats up to critical values in a couple of seconds and turns off, this is a sure sign of an internal short circuit or mechanical jamming of the piston group.
Necessary tool for diagnostics
To carry out a quality test, you will need a minimum set of tools, which often the home craftsman already has it. The main device will be multimeter (tester), capable of measuring resistance in Ohms and checking the integrity of the circuit. It is advisable that the device has an audio dialing function, as this significantly speeds up the process of searching for breaks and allows you not to be distracted by looking at the screen.
In addition, you will need screwdrivers (Phillips and flathead) to dismantle the protective casing at the bottom of the refrigerator Biryusa. Some models may require a socket wrench to remove the start relay or secure the compressor itself. It will not be superfluous to use pliers for carefully removing the terminals and insulating tape for subsequent assembly if you decide to conduct temporary tests.
It is also important to prepare a clean rag and, possibly, a means for degreasing the contacts if they have oxidized. Dirty or oxidized connections may give false resistance readings, leading to misdiagnosis. Make sure that there is good lighting in the work area, as markings on parts may be small and difficult to read.
Dismantling and access to the electrical part
First and The most important step is to completely disconnect the refrigerator from the electrical network. Unplug the power plug from the socket and make sure that access to it is not blocked by anything, so as not to accidentally turn on the device during operation. Only after this can you begin disassembly, being careful not to damage the fragile plastic fastening elements.
Remove the rear protective cover that covers the compressor compartment. For refrigerators Biryusa it is usually attached to several screws. After removing the cover, you will have a view of the black cylindrical compressor tank, condenser grille and start-up protection device. Allow the unit to cool down if it has just been running, as touching hot metal parts can cause burns.
Carefully remove the plastic box covering the electrical contacts of the compressor. Inside you will see three terminals coming from the windings and relays connected to them (starting and thermal). For further testing, it is necessary to disconnect the connectors from the motor contacts. Do this smoothly, slightly shaking the block so as not to break the wires at the very base.
☑️ Disassembly procedure
Checking the integrity of the windings with a multimeter
This is the most important diagnostic stage, allowing you to determine the electrical health of the engine. There should be a connection diagram on the compressor case or in the documentation for the model, but most often the standard marking of three contacts is used: Biryusa There should be a connection diagram, but most often the standard marking of three contacts is used: S (Start - starting winding), R (Run - working winding) and C (Common - common contact). If there is no marking, the location can be determined by dialing.
Turn the multimeter into resistance measurement mode (Ohm) and measure the resistance between pairs of contacts one by one. Between the common contact and the working contact, the resistance is usually from 10 to 30 Ohms, and between the common and starting contacts - from 30 to 100 Ohms (the exact values depend on the motor power). The resistance between the starting and working contacts must be equal to the sum of the two previous values.
If the device shows infinity (one in the most significant digit or symbol OL) on any of the pairs, this means winding break. In this case, current cannot flow through the coil and the engine will not start. Unfortunately, rewinding compressors at home is impractical, and such a unit must be replaced. If the resistance is close to zero, this indicates an interturn short circuit.
| Pair of contacts | Normal resistance (Ohm) | Possible malfunction |
|---|---|---|
| General - Working | 10 - 35 Ohm | Open or short circuit |
| General - Starting | 30 - 100 Ohm | Open circuit or short circuit |
| Working - Starting | Sum of the two above | Faulty windings |
| Any - Housing | Infinity (∞) | Hull Break |
Diagnostics of a breakdown on the housing
A breakdown of the insulation of the windings on the housing is a dangerous malfunction that can lead to electric shock when touching the metal parts of the refrigerator. To check this malfunction, the multimeter is switched to the resistance measurement mode at the maximum limit (usually 2 MOhm or 20 MOhm) or to the continuity mode.
One probe of the tester needs to touch any of the three contacts on the compressor (after cleaning the contact area from oxides, if necessary), and the second probe - to the copper tube on the compressor body or to an unpainted part metal tank. If the device shows at least some resistance (numbers other than infinity) or emits a sound signal, it means that the insulation is broken.
In such a situation, operation of the refrigerator Biryusa is prohibited, since a dangerous potential may appear on the case. Even if the device is grounded and the RCD is tripped, constant current leaks will damage the electronics and can cause a fire at the point of poor contact. The only solution is to completely replace the compressor-condensing unit.
⚠️ Attention: Do not check the breakdown on the housing if your hands or floor are wet. This can distort the instrument readings and create a real threat to the life of the inspector.
Checking the starting relay and thermal protection
Often, the failure of the starting relay or thermal release is mistaken for a compressor malfunction. These elements are located in a black or white plastic case, placed over the motor contacts. The relay is responsible for briefly supplying voltage to the starting winding, and the thermal protection turns off the power when overheated.
To check the thermal protection, test its contacts with a multimeter. When cold, the circuit should be closed (resistance close to zero). If the device shows a break, it means that the bimetallic plate inside has burned out or lost contact, and the current simply does not reach the motor windings. This is a repairable element that can easily be replaced with a similar one.
The starting relay is more difficult to check without special tools, but you can shake it near your ear. If a clear knocking sound of broken ceramic or core is heard inside, the part is faulty. Also inspect the internal chamber of the relay: if the contacts are blackened or melted, their conductivity is impaired and the motor does not receive an impulse to start. Models Biryusa typically use relays of the RT, R-1, R-2 or R-3 type, which are interchangeable if the characteristics match.
Is it possible to start a compressor without a relay?
Theoretically, it is possible apply voltage directly to the starting winding for a short time, but this is extremely dangerous and requires skill. Without a relay, the motor will not go into operating mode and will burn out in a few seconds.
Mechanical check and test run
If the electrical part is in order, the windings are intact and there is no breakdown, all that remains is to check the mechanical part. To do this, you can try to apply voltage directly, but only if you are confident in your abilities and follow all safety measures. A cord with a plug is connected to the contacts, and a short-term connection to the network is performed.
If the mechanical unit is working properly, you will hear a confident hum, and you will feel a strong air flow from the outlet tube. If the engine hums, twitches, but does not start, and at the same time heats up quickly, it means that the piston group has failed. This often happens due to oil burnout or moisture entering the system. jamming piston group. This often happens due to oil burnout or moisture entering the system.
Sometimes it is possible to “wedge” the compressor by applying increased voltage to it (through a transformer) or sharply hitting the housing at the moment of switching on, but these methods are classified as “folk” and give only a temporary effect. For reliable operation of the refrigerator Biryusa in the future, it is better to replace such a unit, since its resource after such manipulations is extremely short.
⚠️ Attention: Direct connection to a 220V network without a starting relay should last no more than 1-2 seconds. Long-term retention will lead to burnout of the starting winding.
Frequently asked questions (FAQ)
Is it possible to repair the Biryusa compressor yourself?
DIY Repair of the internal mechanism of the compressor (replacing valves, pistons) at home impossible. This requires opening the sealed housing, changing the oil and evacuating the system, which requires professional equipment. Only replacement of the entire unit or replacement of the starting equipment is available.
Why does the new compressor not start after replacement?
Most often the reason lies in an incorrectly selected starting relay or errors when soldering pipelines (moisture ingress, lack of vacuum). It is also possible that the refrigerator control board is faulty and does not send a signal to start.
Which compressor is better to install instead of the standard one on Biryusa?
It is optimal to install the original compressor or its full analogue in terms of performance (cooling capacity) and dimensions. Popular substitute brands: Danfoss (Secop), Embraco, Atlant. It is important to match the power and type of refrigerant.
How many ohms should the winding resistance be?
The exact values depend on the model, but approximately: operating winding - 10-25 Ohms, starting winding - 30-90 Ohms. The main rule: the resistance of the starting winding is always higher than the working winding, and the sum of the resistances of the two windings relative to the common wire should give the resistance between the starting and working contacts.