A sudden stop of the refrigerator Atlant often becomes an unpleasant surprise, especially when food in the chamber begins to spoil. The first suspicion in such cases usually becomes compressor the heart of the cooling system, which ensures the circulation of the refrigerant. However, you shouldn’t rush to conclusions and especially not buy a new unit right away, since the problem may lie in the accompanying elements or even in the wiring.
Competent diagnostics allows you to accurately determine whether a complex motor replacement is required or whether it is enough to replace inexpensive parts such as a starting relay or capacitor In this article, we will analyze in detail the algorithm of actions that will help you independently assess the condition of the compressor, using available tools and basic knowledge of physics. Understanding the principles of operation electric motor will save you from unnecessary expenses and allow you to make an informed decision on repairs.
Primary visual diagnostics and sound analysis
Before picking up a multimeter, it is necessary to conduct a thorough external examination and classroom assessment refrigerator operation. Often, characteristic sounds or their absence can tell more about the condition than complex measurements. Plug in the refrigerator and listen: a working unit should emit a smooth, quiet hum 1-3 minutes after starting. motor more than complex measurements. Plug in the refrigerator and listen: a working unit should emit a smooth, quiet hum 1-3 minutes after startup.
If you hear a click, followed by a buzz lasting 5-10 seconds, and then another click and silence, this is a classic sign that the engine is trying to start, but cannot. In such a situation, a jammed piston is often to blame. Also pay attention to the temperature of the compressor housing itself: if it heats up red hot or becomes scalding hot in a short time, this indicates an inter-turn short circuit of the windings. starting relay or a stuck piston. Also pay attention to the temperature of the compressor housing itself: if it heats up red-hot or becomes scorching hot in a short time, this indicates an interturn short circuit of the windings.
⚠️ Attention: If you smell burning or see sparking in the rear grille area, immediately unplug the refrigerator. Further attempts to start may lead to a fire in the wiring or complete failure of the electrical circuit of the apartment.
Visually inspect the tubes coming out of the compressor. When the engine is running, one tube (discharge) should be hot, and the other (suction) should be cold or at room temperature. If both pipes remain cold when the engine is running, there may be no freon in the system or the seal is broken, and the compressor is simply wasting gas.
Instrumental check of the starting relay and protection
The most common cause of a non-working compressor in refrigerators Atlant is a failure of the starting relay or thermal protection relay. These elements are located directly on the motor housing and are responsible for supplying a starting impulse and shutting down in case of overload. To check them, you will need to remove the protective casing from the back of the compressor and carefully disconnect the block.
The thermal relay is a bimetallic plate that opens the circuit when overheated. Check it for melting or cracks. The start relay often contains a coil or posistor inside, which can burn out over time. If traces of soot are visible inside the plastic case or the smell of melted insulation is felt, the part definitely requires replacement, even if the contacts are visually intact.
For accurate diagnostics, use a multimeter in continuity mode. The resistance of a working thermal relay should be close to zero, and the starting relay should “ring” in a certain position (depending on the type of design). If the device shows one or infinity where there should be zero, the circuit is broken and no current flows to the motor windings.
☑️ Diagnostics of relays and protection
When purchasing a new part, pay attention not only to the model of the refrigerator, but also to the marking of the relay itself, so how manufacturers can change the equipment in different years of manufacture.
⚠️ Attention: The design of starting devices may vary depending on the year of manufacture of your model Atlant. Before purchasing spare parts, check the markings on the body of the old relay with the catalog numbers of the manufacturer, since externally similar parts may have different electrical characteristics.
Diagnostics of electric motor windings with a multimeter
If checking the relay does not produce results, you need to proceed to the most important stage - checking the integrity windings electric motor. To do this, you will need to remove the start and thermal relay to gain access to the three contacts on the compressor. These contacts form a triangle and correspond to the starting winding, the working winding and the common wire.
Take a multimeter and set it to resistance measurement mode (Ohm). First, find a common point: call contacts in pairs. The greatest resistance will be between the starting and working windings. The sum of the resistances of the other two pairs should be equal to this value. For example, if between contacts A-B 20 Ohms, B-C 50 Ohms, then between A-C there should be about 70 Ohms.
Normal resistance values for compressors Atlant usually lie within the following limits:
- 🔹 Working winding: from 10 to 25 Ohms (depending on motor power)
- 🔹 Starting winding: from 20 to 40 Ohms (always higher than the working winding)
- 🔹 Total resistance: the sum of the two previous values
If the device shows infinity (open) or zero (short circuit) on any of the windings, the compressor is considered faulty. It is also critical to check that there is no breakdown on the housing. To do this, press one multimeter probe to the cleaned area on the compressor housing (where there is no paint), and with the second touch each of the three contacts. The device should show infinity.
What to do if the resistance differs from the norm?
If the resistance of one of the windings is significantly lower than the norm (for example, 2-3 Ohms instead of 15), this indicates an interturn short circuit. Such a compressor will get very hot and knock out the circuit breaker, requiring mandatory replacement.
The table below shows approximate resistance values for different types of compressors installed in equipment Atlant:
| Compressor type | Working winding (Ohm) | Starting winding (Ohm) | Breakdown to housing |
|---|---|---|---|
| Single-phase (standard) | 12–18 | 25–35 | Infinity |
| Inverter | 5–15 | Depends on the circuit | Infinity |
| Twin-engine | 10–20 (each) | 20–30 (each) | Infinity |
| Faulty (break) | ∞ (infinity) | ∞ (infinity) | Any |
Checking current consumption and discharge pressure
For deeper diagnostics, when the electrical parameters are normal, but the refrigerator is not cooling, it is necessary to measure the current consumed compressor during operation. This allows you to understand whether the motor is idling or experiencing mechanical resistance. To do this, you will need a current clamp, which is placed on one of the power wires (phase) at the time of startup.
The rated current is usually indicated on the compressor tag (for example, 0.5–0.8 A). If, upon startup, the current sharply jumps to 2-3 Amperes and then drops to zero (the protection is triggered), it means that the motor is jammed or the turns are shorted. If the current is significantly lower than normal, this may indicate a freon leak or loss of compressor performance.
Professionals also check the discharge pressure. To do this, a pressure gauge manifold is connected to the discharge pipe. Serviceable compressor Atlant must create a pressure of at least 6–8 atmospheres (depending on the type of refrigerant R134a or R600a). If the pressure gauge needle barely rises and the motor hums, it means that the valves inside are worn out and do not provide the necessary compression.
Analysis of mechanical faults and jamming
Sometimes the electrical part of the compressor is fully operational, but the mechanical part requires intervention. Jamming of the piston group is a common problem for older models Atlant. This can happen due to oil burnout, moisture entering the system, or prolonged downtime of equipment. The symptom is a characteristic buzzing sound with vibration, which ends abruptly with a click of the protection.
There is a “wedging” method, which sometimes helps to revive the unit. It consists of applying voltage directly to the working winding (bypassing the starting relay) or briefly increasing the voltage. However, this method is dangerous and requires skills, since you can completely finish off the motor or get an electric shock.
- 🔸 Sign of jamming: the motor hums for 3-5 seconds and clicks, the body is very hot.
- 🔸 Sign of broken mechanical connections: the motor is quiet, but there is no pressure in the system.
- 🔸 Sign of wear on the valves: the refrigerator works constantly, without turning off, but the temperature in the chamber only drops slightly.
If you suspect a mechanical breakdown, you should think about the feasibility of repairs. Replacing a compressor with resoldering of tubes and refilling with freon often costs 50–70% of the cost of a new refrigerator.
⚠️ Attention: Methods of “wedging” with a hammer (tapping the housing) or increasing the voltage are effective only in 30% of cases and often lead to the final destruction of the piston group. They should only be used if you are ready to buy a new compressor in case of failure.
Making a decision: repair or replacement
After carrying out all the diagnostic measures, you will be faced with the question: repair or replace? If the diagnostics showed a break or short circuit of the windings, a breakdown to the housing or loss of compression replacing the compressor is inevitable. It is impossible to rewind a modern sealed motor-compressor on your own at home.
If only the starting relay or thermal fuse is faulty, the repair will be inexpensive and can be done by yourself. The main thing is to choose the right analogue. For refrigerators Atlant relays from other manufacturers (Danfoss, Secop) are often suitable if the electrical parameters and mounting dimensions match.
It is also worth considering the age of the refrigerator. If the equipment is more than 10–12 years old, replacing the compressor may not be economically feasible, since the life of other components (evaporator, condenser, seals) is also coming to an end. In such a situation, it is easier to consider purchasing a new model with a modern inverter motor and a warranty.
Frequently asked questions (FAQ)
Is it possible to check a compressor without a multimeter?
It is impossible to fully check the condition of the windings without instruments. However, you can indirectly evaluate the operation: if the relay clicks, the motor hums for 5-10 seconds and turns off, and is hot - most likely the problem is in it or in the relay. If the motor is silent and cold, the relay or wiring may have burned out. Only a tester will make an accurate diagnosis.
Why does the new compressor in Atlanta not start?
The reasons may be incorrect connection of wires to the terminals, a malfunction of the new starting relay (they are often included in the kit, but are defective) or the presence of air/moisture in the system after poor-quality soldering. Also check if the tubes are jammed during installation.
How many ohms should be on the windings of the Atlant compressor?
For most models, the resistance of the operating winding is 10–25 Ohms, and the starting winding is 20–40 Ohms. The exact values depend on the specific motor model and are indicated in the technical documentation. The main rule: the resistance of the starting winding is always higher than the working one.
Is it possible to replace the compressor with an analogue from another brand?
Yes, you can. Compressors are standardized in size and electrical characteristics (power, refrigerant). The main thing is that the refrigerant is the same (R134a or R600a), and the power (in watts or cm³) is no less than that of the original motor. re-hanging the doors of the Biryusa 627 refrigerator. Disassembly diagram, adjusting hinges, adjustment Atlant.