A sudden stop of the refrigerator Atlant is always stressful, because there may be products inside that require low temperatures. Often the cause of a breakdown is the failure of the start-up relay, which is responsible for starting the engine and protecting the windings from overloads. If you hear that the motor is humming, but does not start, or it turns on for a couple of seconds and immediately clicks, then the problem most likely lies in this unit.
Replacing this element independently is quite within the capabilities of a home craftsman with basic skills in working with tools. The main thing is to observe safety precautions and strictly follow the sequence of actions so as not to damage the expensive compressor. In this article, we will look in detail at how to diagnose a malfunction, select the correct analogue and connect the refrigerator compressor relay Atlant.
The principle of operation and design of the starting protection relay
The starting relay is an electromechanical switch that supplies current to the starting winding of the engine at the moment start. As soon as the compressor rotor reaches the required speed, the device opens the starting winding circuit, and the engine continues to operate on the main one. Models Atlant most often use induction relays with a posistor or thermal breaker.
The protective function is implemented through a bimetallic plate that responds to current strength. If the current exceeds the norm, which can happen when the rotor is jammed or short circuited, the plate heats up and opens the contacts, de-energizing the unit. This prevents the windings from burning out and more serious damage to the electric motor. It is important to understand that a relay is not just a switch, but a complex element that coordinates the operation of the windings. Incorrect connection or the use of an incompatible analogue can lead to the compressor operating in abnormal mode, which will drastically reduce its service life. electric motor.
It is important to understand that a relay is not just a switch, but a complex element that coordinates the operation of the windings. Incorrect connection or use of an incompatible analogue can lead to the compressor operating in abnormal mode, which will drastically reduce its service life.
There are several types of relays used in household appliances: induction, thermal and combined. In refrigerators Atlant the most common are combined models, where the starting and protective devices are combined in one housing. This simplifies the design, but requires care during installation.
Diagnostics of faults before replacement
Before proceeding with dismantling, you need to make sure that the problem is in the relay, and not in the compressor or wiring itself. Primary diagnosis is carried out visually and auditorily. If, when you turn on the refrigerator, you hear a click, followed by a hum, and then another click and silence, this is a classic symptom of a faulty starter.
For a more accurate check, you will need a multimeter. It is necessary to ring the relay contacts in different positions. In normal condition, the resistance between the contacts should be close to zero or correspond to certain values specified in the technical documentation. If the multimeter shows an open circuit or, conversely, a short circuit where it should not be, the part must be replaced.
⚠️ Attention: Never try to start the compressor by bypassing the relay or closing the contacts directly for a long time. This can lead to instant burning of the motor windings and a fire hazard.
It is also worth inspecting the contacts for oxidation or carbon deposits. Sometimes it is enough to clean them to make the device work again, but if the plastic case has melted or blackened, then repair is impossible - only a complete replacement. Also check the integrity of the wires going to the terminals.
Preparation for work and selection of tools
To successfully complete the work of replacing the relay, you will need a minimum set of tools. First of all, this is a set of screwdrivers (phillips and flathead) for removing the casing and terminals. You will also need pliers or pliers with insulated handles for working with wires and clamps.
Be sure to prepare a multimeter to test circuits and, possibly, electrical tape or heat shrink tubing to insulate connections. Don't forget about gloves so as not to get your hands dirty with technical oil and not to get hurt on the metal edges of the compressor casing.
The most important preparation rule is to completely de-energize the device. Unplug the power cord from the outlet. Do not rely on the refrigerator being turned off by a button or thermostat. Working with electrical appliances under voltage is strictly prohibited.
☑️ Preparation for replacing the relay
Organize the workspace so that you have easy access to the back of the refrigerator. If the unit is built-in, it may need to be partially removed from the niche. Make sure the floor is dry and clean so that small parts that accidentally fall are not lost.
Step-by-step instructions for removing the old relay
The process of removing the relay begins by removing the protective casing located at the bottom rear of the refrigerator. It is usually secured with latches or screws. Carefully unscrew the fasteners and remove the plastic or metal cover, gaining access to the compressor.
Locate the start relay, which is placed directly on the side terminal of the compressor. It looks like a small box with wires coming out of it. Before pulling it, carefully inspect the way the wires are attached. In modern models Atlant the wires can be fixed with plastic clips or clamps.
Remove the fixing clamp or wire that holds the relay in place. Then gently pull the relay to the side, removing it from the compressor contact pins. Proceed without jerking so as not to damage the ceramic insulators or the motor terminals themselves.
| Work stage | Action | Important nuances |
|---|---|---|
| 1. Access | Removing the back cover | Do not lose the screws, put them in a container |
| 2. Fixation | Removing the clamp clamp | Remember the position of the clamp for reinstallation |
| 3. Disconnection | Disconnecting wires | Take a photo of the connection diagram before disconnecting |
| 4. Removal | Removal from the terminals | Pull strictly along the axis of the terminals, without loosening |
After removing the relay, disconnect the wire terminals. If they are tight, use pliers, but be careful not to damage the insulation. It is recommended to photograph or sketch in advance which wire was connected where, since the color marking may vary in different batches.
Connection diagram and installation of a new relay
Installation of a new device is carried out in the reverse order of dismantling. However, it is critical to correctly orient the relay relative to the compressor terminals. There are markings on the relay body and on the motor terminals: R (Run - working winding), S (Start - starting winding) and C (Common - common wire).
Align the relay holes with the compressor terminals. Typically the relay is worn in only one correct position. If you feel resistance, do not press with force - turn the device over or check the markings. Incorrect installation will result in the compressor not starting or burning out.
What do the letters on the compressor terminals mean?
The letter C (Common) is the common pin to which the phase is supplied. The letter R (Run) leads to the working winding, which creates the main magnetic field. The letter S (Start) leads to the starting winding, which creates the initial torque. Mixing up R and S often results in a hum without starting.
Connect the wires to the relay terminals according to the previously made diagram or photograph. Make sure the contacts fit tightly and are not loose. If the terminals have a screw terminal, carefully tighten them, but without fanaticism, so as not to strip the thread.
Fasten the relay to the compressor terminals until it stops. Replace the fixing clamp or bracket, which will prevent the relay from falling off due to vibration when the unit is operating. Vibration is a constant companion to the operation of the refrigerator, and reliable fixation is vital here.
Checking functionality and first start-up
After installing all the elements in place, but before putting the protective casing in place, you can make a test run. This will make sure that the compressor starts smoothly, without any extraneous sounds or knocking out plugs. Plug in the refrigerator.
At the moment of startup, you should hear a confident start of the engine, followed by a smooth hum. If there is a loud click and silence, or the motor hums but does not turn, turn off the power immediately. This is a signal that the relay is selected incorrectly or installed incorrectly.
Pay attention to the current consumption if you have current clamps. It must match the rating indicated on the refrigerator tag. An excessive current may indicate problems with the compressor itself, and not just with the relay.
⚠️ Attention: If after replacing the relay the compressor starts, but after 5-10 minutes of operation it turns off again and does not turn on again, perhaps the problem is not in the relay, but in the thermostat or defrost system. Do not change the relay again without diagnostics.
If everything went well, let the refrigerator operate for 10-15 minutes without the back cover, controlling the heating of the relay housing. It shouldn't get too hot. Then replace the cover and secure it. Check whether the wires are pinched by the cover.
Frequent errors and operating tips
One of the most common mistakes is ignoring cleaning the capacitor when replacing the relay. If the radiator at the back of the refrigerator is clogged with dust, the compressor operates with overload, which leads to frequent failures of the starting equipment. Always take the opportunity to clean the equipment.
Also, technicians often forget to check the condition of the compressor itself. If the old relay burned out due to an interturn short circuit in the motor, installing a new relay will only give a temporary effect. Therefore, diagnostics must be comprehensive.
- 🔌 Always check the integrity of the power cord before turning it on after repair.
- 🧹 Regularly, once every six months, clean the rear grille of dust to improve heat transfer.
- ⚖️ Monitor the stability of the refrigerator: misalignment can cause vibration that destroys the relay contacts.
- 🌡️ Do not install the refrigerator close to the wall, leave a gap for air circulation.
Remember that the quality of spare parts plays a decisive role. Cheap Chinese analogues of relays may not have the proper safety margin and fail after a few months. It is better to purchase original spare parts Atlant or certified analogues from well-known manufacturers.
Is it possible to install a relay from another refrigerator?
Theoretically, yes, if the current characteristics, type (induction/thermal) and mounting dimensions are the same. However, it is better not to experiment, since different compressors have different acceleration times and starting currents, which can lead to incorrect operation of the protection.
Questions and answers (FAQ)
Is it possible to start the Atlant refrigerator without a relay?
You can start it for a short time by applying voltage directly to the working winding and briefly on the starting one, but this is dangerous and requires skills. Constant operation without a relay is unacceptable, since the engine will burn out at the first overload or attempt to restart.
Why does the new relay click, but the compressor does not start?
This may indicate that the relay does not match the current characteristics, or the compressor itself is faulty (the piston group is jammed, the interturn short circuit). Also, the reason may be low voltage in the network.
How to determine whether the relay or the compressor itself has burned out?
You need to ring the compressor windings with a multimeter. If there is resistance between the terminals and there is no breakdown to the housing, most likely the problem is in the relay or starting capacitor. If the winding sounds like a short circuit or break, the compressor is faulty.
Do you need to wait after turning off the refrigerator before replacing the relay?
Yes, it is advisable to wait 5-10 minutes. This is necessary so that the pressure in the refrigerant system is equalized, and it is easier for the compressor to make the first start after repair, although this is not critical for electrical safety.