The situation when a refrigerator Atlant stops cooling, often takes you by surprise, and the first suspicion is a motor malfunction. Equipment owners are starting to look for ways to check the performance of the unit, wondering whether it is possible to start the Atlant refrigerator compressor directly, bypassing the standard automation. This method does exist and is widely used by craftsmen for diagnostics, however, it requires strict adherence to electrical safety rules and an understanding of the principles of operation of the electrical circuit.
Before you begin any manipulations with electrical wiring, you must clearly understand that you are dealing with a high voltage of 220 volts. Direct connection allows you to exclude the thermostat from the circuit and a starting relay, supplying power directly to the motor windings. This makes it possible to understand whether the motor itself has burned out or the problem lies in the control electronics and sensors.
In this article we will analyze in detail the connection diagram, the necessary tools and the sequence of actions for safely checking the motor. We will not use complex theoretical calculations, but will focus on practical steps that will help you determine the cause of the breakdown. Remember that if you are not confident in your abilities, it is better to entrust the work to professionals, since mistakes can lead to complete failure of the equipment.
The principle of operation and structure of the compressor
To successfully start the engine, you need to understand how it works inside. The refrigerator compressor Atlant is a sealed unit, inside of which there is an electric motor and a piston group. Three contact pins are located on the motor housing, which are responsible for supplying voltage to different windings. It is the correct determination of the purpose of these contacts that is the key to a successful launch.
The electrical circuit includes two main windings: working and starting. The working winding has greater resistance and provides the main rotation of the rotor during operation. The starting winding is needed only to create the initial torque and turns off immediately after gaining speed. In normal mode, the starting relay is responsible for this switching, which we will exclude during direct testing.
⚠️ Attention: The sealed compressor casing cannot be opened for the sake of curiosity. Inside there is freon under pressure, as well as special oil. Violation of the tightness will lead to refrigerant leakage and moisture ingress, which is guaranteed to damage the unit.
For diagnostics, it is important for us to know that the starting winding has a smaller wire cross-section and, accordingly, a higher resistance than the working one. However, with a direct connection, we often use a circuit where we briefly apply a pulse to the starting winding, simulating the operation of a relay. If the motor is working properly, it will begin to hum and work until you turn off the power.
Why does the compressor hum, but does not start?
If, when power is applied, you hear a hum, but the shaft does not rotate, this may indicate a jammed piston group or an interturn short circuit. Also often the cause is insufficient voltage in the network or a malfunction of the capacitor (if provided by the model).
Necessary tools and safety measures
Working with electricity requires preparation. You don't need complex industrial tools, but a basic set should be on hand. The main requirement is the serviceability of the devices and the integrity of the insulation of the wires with which you will make the connection. Ignoring this point may lead to electric shock.
To carry out diagnostics, prepare the following tools:
- 🔧 Multimeter or tester for continuity of windings and checking voltage.
- 🔌 Two pieces of insulated wire with stripped ends.
- 🪛 Set of screwdrivers for removing the protective cover of the compressor.
- 🧤 Dielectric gloves for additional hand protection.
Before starting work, be sure to disconnect the refrigerator Atlant from the electrical network. Unplug the plug from the socket. Even if you plan to supply voltage, the initial dismantling of the protective casing and disconnection of the standard wires should be done with the device completely de-energized. This is the golden rule of any repair.
Pay attention to the condition of the wires coming from the thermostat and relay. If the insulation is melted or cracked, they cannot be used for connection. Replace them with new copper conductors with a cross-section of at least 0.75 mm². Thin wires can overheat and melt at the time of start-up, when the current increases several times.
Compressor contact connection diagram
The most critical stage is the correct identification of contacts. On the back panel of the refrigerator compressor Atlant there is a contact group of three pins arranged in a triangle. To start the motor directly, you need to know which one is responsible for what. Usually they are marked with letters or colors, but the markings can be erased over time.
The standard marking is as follows:
- 🅰️ R (Running) - working winding.
- 🅰️ S (Starting) - starting winding winding.
- 🅰️ C (Common) - common contact.
If the letters are not visible, you can use a multimeter in resistance measurement mode. Between the common contact and the working winding, the resistance will be average (about 20-30 Ohms), between the common and starting windings - high (about 40-60 Ohms), and between the working and starting windings - the sum of these values. The common contact always shows the least resistance when paired with any other.
| Parameter | Working winding (R) | Starting winding (S) | Common contact (C) |
|---|---|---|---|
| Resistance | Low (20-30 Ohm) | High (40-60 Ohm) | Sum of R and S |
| Function | Basic work | Starting the rotor | Connecting zero |
| Wire color (often) | Red / Brown | Blue / White | Black / Green |
To start directly, the circuit looks like this: one wire from the 220V plug (phase) is connected to the common contact C. The second wire from the plug (zero) is connected to the working winding R. In order for the motor to start, it is necessary to briefly apply an impulse to the starting winding S. This can be done by touching the contact with the free wire coming from the phase S for a split second.
Step-by-step instructions for starting the engine
Now let's move on to the practical part. Make sure you remove the rear protective cover of the refrigerator Atlant and get to the compressor. Disconnect the stock start relay and thermostat. We only need the motor itself with three protruding contacts.
☑️ Check before starting
Take the prepared power cord. Securely fasten one end of it (for example, the right pin of the plug) to the common contact of the compressor. Connect the left pin of the plug to the contact of the working winding. Now carefully plug the plug into the outlet. The motor should hum, but not start, because there is not enough starting impulse.
Using an insulated conductor, connect the contact of the starting winding to the contact of the working winding (or to the phase wire) for a very short time - literally for 0.5–1 second. If the compressor is working properly, you will hear a characteristic starting click, the hum will change to the smooth hum of a running engine, and air will begin to escape from the pipes at the rear.
⚠️ Attention: Do not keep the start contact closed for more than 2-3 seconds. The starting winding is not designed for long-term operation and may burn out, after which the compressor will have to be discarded.
After a successful start, let the motor run for 10-15 seconds to ensure rotation stability. Then turn off the power. If the motor starts and runs smoothly, it means that the problem was in the start relay or thermostat, and the unit itself is working..
Fault diagnosis and typical errors
It is not always possible to start the refrigerator compressor Atlant on the first try. If the motor hums but does not rotate, or does not make any sounds, this indicates a specific malfunction. It is important to correctly interpret the behavior of the unit so as not to harm it even more.
Let's consider the main scenarios:
- 🔇 Complete silence: Most likely, a break in the windings or lack of contact. Check the continuity of the circuit with a multimeter.
- 🔊 Humming without starting: The motor is trying to start, but it does not have enough torque. Perhaps the piston group is jammed or the capacitor is faulty.
- 💥 Knocks out plugs: Short circuit in the windings or breakdown to the housing. The operation of such a compressor is prohibited.
A common mistake is confusion in the contacts. If you mix up the working and starting windings when turned on for a long time, the engine will burn out in a matter of minutes. It is also dangerous to hold the starting impulse for a long time. Some craftsmen try to “unwedge” the motor by turning the shaft manually for a long time, but in hermetic compressors Atlant this cannot be done without opening it, which is unacceptable.
If, when dialing, the tester shows resistance close to zero or, conversely, infinity between any contacts and the housing, The compressor needs to be replaced. Such units cannot be restored at home.
Is it possible to restore a burnt-out compressor?
Theoretically, rewinding the windings is possible, but in practice, the cost of such work and the complexity of sealing make this process economically impractical. It’s easier to buy a new unit.
When it is necessary to replace the compressor
There are situations when starting directly is impossible or does not make sense. If the diagnostics showed an interturn short circuit or a breakdown in the housing, further attempts to revive the motor are useless. In such cases, a complete replacement of the compressor in the refrigerator is required Atlant.
Signs indicating the need for replacement:
- 🛑 The engine instantly heats up to critical temperatures.
- 🛑 Thermal protection is triggered immediately after switching on.
- 🛑 Presence of a burning smell or scorched insulation.
Replacing a compressor is a complex process that requires not only electrical knowledge, but also skills in working with refrigeration equipment. It will be necessary to evacuate the system, fill with freon and seal the tubes. It is almost impossible to perform replacement and refueling on your own without special equipment (vacuum pump, pressure gauge station).
⚠️ Attention: If you replaced the compressor but did not evacuate the system, the remaining moisture and air will lead to blockage of the capillary and failure of the new motor in a short time.
Therefore, if your direct connection test showed a malfunction of the very “heart” of the refrigerator, the best solution would be to call a technician. He will select a compressor of similar power and dimensions, perform professional soldering and refill with refrigerant.
Frequently asked questions (FAQ)
Is it possible to leave the refrigerator working with a direct connection all the time?
No, it is not possible. Direct connection is used for short-term diagnostics only. Without a starting relay and thermal protector, the compressor may burn out during a power surge or overheating, since the automatic protection will be excluded from the circuit.
Why does the compressor hum, but does not start even with a direct connection?
This may indicate jamming of the piston group (mechanical wedge) or loss of capacity of the starting capacitor (if there is one) in the diagram). It is also possible that there is an interturn short circuit in the starting winding, due to which it does not create the required magnetic field.
Which compressor is best to choose for replacement in Atlanta?
It is best to install the original compressor Atlant of the same series. If the original is not available, select an analogue based on power (in BTU or hp), type of refrigerant (R134a or R600a) and overall dimensions. Danfoss and Embraco motors are also popular.
Is it dangerous to touch a running compressor?
Yes, it is dangerous. Firstly, there is a risk of electric shock if the insulation is damaged. Secondly, the housing of a running compressor becomes very hot (up to 80-90 degrees), which can cause burns. Thirdly, there are tubes with high pressure nearby.
How long can you keep the compressor turned on during diagnostics?
10-20 seconds of operation is enough to check. Long-term operation "dry" (without freon and oil circulating through the system) and without a condenser can lead to overheating of the windings, since the motor is cooled in normal mode due to the circulation of the refrigerant.