The situation when the refrigerator Atlant stops cooling, and only a quiet sound is heard from behind the compressor A buzzing or clicking sound often indicates a faulty starter relay. This is a small part that is responsible for supplying a starting impulse to the engine. However, in emergency cases, when you urgently need to cool food or check the serviceability of the motor itself, it becomes necessary to start the unit bypassing the standard automation. Direct connection requires a deep understanding of the electrical processes occurring inside the motor.
Many craftsmen use this method solely for diagnostic purposes to prevent damage to the compressor itself. If the engine starts and runs smoothly when manually controlled, then the problem lies in the relay or thermostat. But be careful: working with high voltage and lack of standard protection can lead to serious consequences, including failure an expensive unit or electric shock.
In this article we will analyze the technical nuances of the motor design, the procedure for checking the windings and a step-by-step algorithm for safe starting. You will learn how to correctly identify contacts and what tools you will need to carry out the work. Remember that this procedure is temporary and is not intended for permanent operation of the refrigerator.
Operating principle and design of a single-phase motor
Compressors installed in refrigerators Atlantare usually equipped with single-phase asynchronous motors. The peculiarity of such motors is that to start rotating the rotor, one working winding is not enough for them. A second winding is required, called the starting winding, which creates a phase shift and generates torque. It is for switching between these windings that the starting relay is responsible, which we plan to exclude from the circuit.
In normal operation, the current passes through the working winding, creating a magnetic field, but not sufficient for a start. At the moment of switching on, the starting relay supplies voltage to the starting winding. As soon as the engine reaches the required speed (approximately 75% of the rated speed), the centrifugal mechanism or thermal relay opens the starting winding circuit. Further work is carried out only on the working winding. Ignoring this cycle If started manually, it can lead to overheating.
⚠️ Attention: The starting winding is designed for short-term operation. If it is left energized after the engine has started, it will burn out within seconds, causing permanent damage to the compressor.
Understanding the physics of the process is critical. You don't just connect wires, you simulate the operation of a complex electromechanical unit. Modern models Atlant can use inverter compressors, where the operating principle is different, and the described method is not applicable to them. We are considering classic linear units, which make up the majority of the household appliance fleet.
Necessary tools and precautions
To carry out diagnostics and start-up, you will need a minimum set of tools that any home craftsman will have. However, quality of execution matters. Cheap tools can cause poor contact, sparking and, as a result, fire or damage to the compressor contacts. Prepare everything in advance so as not to be distracted during the work.
- 🔧 Screwdrivers (phillips and flat) - for dismantling the casing and removing the terminal box.
- 🔌 Wires with alligator clips - for temporary connection to the contacts.
- ⚡ A multimeter or tester - to check the integrity of the windings and the absence of breakdown on the housing.
- 🧤 Dielectric gloves are a mandatory element of protection when working under voltage.
Pay special attention to the insulation of the wires. Since we will be working with exposed live contacts, the risk of a short circuit is high. Use wires with a cross-section of at least 0.75 mm² so that they can withstand the starting current, which can be several times higher than the operating current of the motor. Thin wires can melt instantly.
It is also important to ensure the work area is dry and clean. Moisture on the contacts can lead to insulation breakdown. If the compressor has traces of oil or dirt, they must be carefully removed with a dry cloth before starting any manipulations. This will help avoid tools sliding and unintentional short circuits.
☑️ Checking readiness for operation
Diagnostics of the windings before starting
Before applying voltage, you need to make sure that the engine itself is in good condition. Starting a faulty compressor can be useless or even dangerous. The first step should always be visual inspection and checking electrical parameters. Remove the start relay and thermal relay from the compressor contacts to gain access to the three terminals.
The contacts on the compressor are usually arranged in a triangle. You need to determine which of them belongs to the working winding, which to the starting winding, and which is common. In most models Atlant the circuit is marked on the case or in the technical documentation, but it is better to double-check with a multimeter. The resistance between the common contact and the working winding is always less than between the common and the starting winding.
| Pair of contacts | Expected resistance | Diagnosis |
|---|---|---|
| Common - Working | 10-25 Ohm | Normal (working winding) |
| General - Starting | 25-50 Ohm | Normal (starting winding) |
| Any contact - Housing | Infinity (∞) | No breakdown to ground |
| Any contact - Housing | 0 or low value | Insulation breakdown (dangerous) |
If the multimeter shows a resistance close to zero between the contacts, this indicates an interturn short circuit. In this case, there is no point in starting the compressor - it must be replaced. Also check that there is no resistance between any terminal and the copper tube or motor housing. The presence of conductivity indicates breakdown to the housingwhich makes operation of the refrigerator impossible without replacing the unit.
How to distinguish the working winding from the starting winding without a circuit?
If there is no marking, measure the resistance between all three pairs of contacts. The greatest resistance will be between the starting and working windings. The remaining third contact is common. From the common to the working winding, the resistance will be less than from the common to the starting winding.
Connection diagram and procedure
After successful diagnostics, you can proceed to direct start-up. The procedure depends on whether you have a button on hand or plan to use a temporary wire connection. The essence of the method is to constantly supply voltage to the common and working contacts, and to the starting contact only at the moment of start.
You will need to assemble a simple circuit. Take two wires from the plug (or 220V source). Connect one wire to the common contact of the compressor. Branch the second wire: one part of it goes to the working contact, and the second - through a button or manually to the starting contact. Key point — the starting contact should receive power only for 1-2 seconds.
Connection diagram:Phase (L) -> Button -> Start winding
Phase (L) -> Working winding (constant)
Zero (N) -> Common winding (constant)
The starting algorithm is as follows: first, power is applied to the working winding, The motor starts to hum, but does not rotate. At this brief moment (literally a split second), you need to close the starting winding circuit. The engine should start with a jerk and gain speed. As soon as you hear a smooth hum of operation, the starting winding circuit must be broken immediately.
Risks and possible consequences of manual starting
Starting the compressor bypassing the relay is an emergency measure associated with risks. The main danger is the lack of thermal protection. The standard relay not only starts the motor, but also turns it off when the rotor overheats or jams. With manual control, you take this function upon yourself, and any delay can cost the engine its life.
Prolonged voltage on the starting winding causes it to rapidly heat up. The insulation of the wires inside the motor may melt, causing a short circuit in the turns. It is almost impossible to restore a burnt winding at home; an expensive rewinding or replacement of the unit will be required. Saving on relays may lead to the purchase of a new compressor.
⚠️ Attention: Do not leave a manually started compressor unattended. Without a standard relay, it will not turn off when the desired temperature is reached or when there is an overload, which can lead to a fire.
In addition, there is a risk of damage to the valve group. If the motor starts with a delay or jerks, a water hammer is created in the system. Liquid refrigerant may enter the cylinder, causing damage to the reed valves. Therefore, this method is acceptable only for short-term testing or emergency rescue of products.
Alternative solutions and replacing the relay
Instead of taking risks and constantly keeping the process under control, it is much wiser to replace the faulty part. Starting relays for refrigerators Atlant are consumables and are relatively inexpensive. Replacing them takes no more than 15-20 minutes and does not require special equipment other than a screwdriver.
When purchasing a new relay, pay attention to the markings. They are selected strictly according to the power and type of compressor. There are no universal solutions, although some relay models have a wide range of compatibility. There is always a number on the body of the old relay by which you can find an analogue. Correct selection will ensure long and stable operation of the refrigerator.
If the compressor does not start even with a new relay and with a direct connection, then the problem is deeper. Perhaps the thermostat has failed and is not sending a signal to turn on, or there has been a break in the control circuit. In such cases, a more in-depth diagnostic is required with continuity testing of the entire electrical circuit of the refrigerator.
Is it possible to use a relay from another refrigerator?
You can use a relay from another refrigerator only if their electrical characteristics are identical. The rated current, type of compressor (low-speed or high-speed) and mounting method are important. An unsuitable relay may not start the motor or burn out on its own.
Why does the compressor hum, but does not start without a relay?
Humming means that the working winding is working and voltage is applied to it, creating a magnetic field. However, without an impulse to the starting winding, the rotor cannot take off and start rotating. The motor is in a state of electromagnetic braking, which quickly leads to its overheating.
How long can you operate a refrigerator without a relay?
Not a minute. Operation without a relay is impossible in principle, since it is the relay that provides the on and off cycle. Starting without a relay is possible only for a few seconds to check, after which the starting winding circuit must be immediately broken.