A sudden cessation of operation of the refrigeration chamber in models Atlant with two compressors often becomes an unpleasant surprise that requires immediate intervention. Equipment owners are faced with the fact that food in the upper compartment stops cooling, while the freezer continues to function normally. Such asymmetry in the operation of the cooling system is a classic sign of failure of the thermostat, which is responsible specifically for the refrigeration compartment.
Timely replacing the thermostat avoids spoilage of food and prevents possible overload of the second compressor, which may try to compensate for the lack of cold by continuous operation. The two-compressor circuit of refrigerators Atlant is structurally divided into two independent circuits, which makes diagnostics simpler, but requires a careful approach to electrical connections. Understanding the operating principle of the temperature sensor will help you troubleshoot the problem yourself, saving on calling a technician.
In this article we will analyze in detail the diagnostic process, selection of a compatible element and the procedure for its installation. You will learn how to properly remove the old sensor without damaging the capillary tube, and how to set up a new regulator for optimal energy consumption. It is critically important to disconnect the unit from the power supply 15-20 minutes before starting work, so that the refrigerant in the system has time to settle and the capacitors are discharged.
Principle of operation and signs of malfunction thermostat
The temperature regulator in refrigerators Atlant is an electromechanical device that closes or opens the electrical circuit of the compressor depending on the temperature inside the chamber. Inside the housing there is a sealed system filled with heat-sensitive gas, which expands or contracts, affecting the membrane and contact group. When the temperature reaches a predetermined threshold, the contacts open and the engine stops.
The main sign of a breakdown is the situation when the refrigeration chamber compressor does not start at all, or, conversely, works non-stop, causing severe freezing of the rear wall. In dual-compressor models, it is important not to confuse one unit with the problems of another; If the freezer is working, then the problem is localized in the refrigerator compartment circuit. Often, before a complete failure, “floating” temperature conditions or too infrequent engine starts are observed.
Why does the thermostat break?
The main reason for failure is the natural wear of the contact group due to constant on-off cycles, as well as a violation of the tightness of the bellows, which leads to leakage of sensitive gas.
For accurate diagnostics before replacement, you can use a multimeter in dial mode. It is necessary to remove the casing, remove the thermostat and check the resistance between the contacts at different temperatures of the sensing element. If during cooling (for example, putting the sensor in the freezer for several minutes) the circuit does not break or close, thermostat requires replacement.
Necessary tools and preparation for repair
To successfully complete the work of replacing the temperature sensor in refrigerator Atlant you will need a minimum set of tools that can be found in the arsenal of most home craftsmen. It is important to prepare everything necessary in advance so that the process is not interrupted by searching for small details, especially considering that some operations require accuracy and free access to the unit components.
You will need a flat-head and Phillips screwdrivers to dismantle the plastic casings and remove the regulator itself. You will also need a side cutter or pliers to work with wires, although in some models the connection is made through connectors. Don't forget to prepare electrical tape or heat-shrink tubing to insulate the connections, as well as a container to collect possible condensation.
☑️ Tools for replacing the thermostat
Pay special attention to safety: make sure the refrigerator is completely defrosted and dry. Water inside the unit may cause a short circuit when voltage is applied during testing. You should work in good lighting, since the interior of the refrigerator compartment is quite dark, and the parts are small.
Removing the old thermostat: step-by-step algorithm
The process of removing the faulty element in two-chamber models Atlant begins with opening the door of the refrigerator compartment. The thermostat is usually located inside the chamber, in the upper right corner, and is hidden under a plastic protective cover. Carefully pry the casing with a screwdriver or simply remove it with your hands, depending on the design of the specific model, to gain access to the adjustment knob and fastening.
Remove the temperature control knob by pulling it towards you. Below this you will see a mounting screw or nut that holds the thermostat housing in place. After unscrewing the fasteners, carefully pull the device body out. Be extremely careful with the capillary tube - this is a thin copper tube that passes through the wall of the refrigerator and is attached to the evaporator.
Disconnect the electrical wires from the thermostat contact group. In older models, the wires can be twisted and insulated, in new ones they are connected through terminal blocks. Before disconnecting, it is strongly recommended to photograph the connection diagram or sketch the colors of the wires, since mixed up contacts can lead to a short circuit or incorrect operation of the compressor.
Installation of a new sensor and connection diagram
Installation of a new one thermostat is carried out in the reverse order of dismantling. First of all, it is necessary to correctly insert the capillary tube into the mounting hole in the wall of the refrigerator. The tube should fit in freely, without kinks or strong tension. The immersion depth of the sensitive element must correspond to the length of the old one so that it correctly reads the temperature of the evaporator.
Fix the thermostat housing in its original place using the mounting screws. Make sure that the device fits snugly and does not wobble, as vibrations from the compressor can damage the contacts over time. After mechanical fixation, proceed with the electrical connection, focusing on the photographs taken earlier or the color marking of the wires.
| Wire color | Contact assignment | Note |
|---|---|---|
| Red / Brown | Phase (input) | Main power |
| Black / Blue | Output to compressor | Motor control |
| Yellow / Green | Grounding | Case safety |
| White | Lighting lamp | Not in all models |
If in your model the wires are not color coded or it is worn out, use a multimeter to check the continuity of the circuit. One probe is placed on the input wire (from the plug), and the other is looking for a contact that closes at room temperature. This will be the output to the compressor. The remaining contact usually goes to the lighting lamp or door button.
Configuring and testing the operation of the refrigerator
After installing the new element and checking all connections, you can proceed to testing. Plug in the refrigerator and set the thermostat knob to the middle position (usually number 3 or 4). You should hear a characteristic click and start of the refrigerator compressor. If the motor starts working, it means that the electrical circuit is assembled correctly.
Let the unit run for about 30-40 minutes. During this time, the temperature inside the chamber should begin to decrease. Check the operation of the automation: wait for the moment when the refrigerator should turn off. If the compressor runs continuously for more than an hour and a “coat” of frost forms on the back wall, an adjustment may be required using the screw on the thermostat housing.
Pay attention to the operating cycle: normally the compressor should turn on and off periodically. If the operating intervals are too short or, conversely, too long, this may indicate an incorrect selection of the thermostat model or a refrigerant leak, which requires more complex repairs with the participation of a specialist.
Common mistakes when replacing yourself
One of the most common mistakes is damage to the capillary tube during installation. Any microcrack will lead to leakage of filler gas, and the thermostat will stop responding to temperature changes, remaining in the “open” position. Also, technicians often forget to securely fix the end of the tube to the evaporator, which is why the sensor “hangs” in the air and shows the wrong temperature.
⚠️ Attention: Never try to repair the thermostat itself (soldering the tube or opening the housing). This device cannot be restored at home and requires a complete replacement with a new unit.
Another mistake is ignoring the state of the wire insulation. In conditions of high humidity and temperature changes inside the refrigerator, poor insulation will quickly lead to oxidation of the contacts and repeated failure. Use only high-quality electrical tape designed for low temperatures or heat shrink.
Incorrect settings can also lead to problems. If you turn the knob to maximum immediately after replacement, the compressor may wear out, trying to reach an unattainable temperature, which will shorten its life. Start setting from average values and adjust according to the actual temperature of the products.
Choosing a compatible thermostat for Atlant
When purchasing a new spare part, it is important to consider that refrigerators Atlant were equipped with thermostats from different manufacturers, most often Tam, K59, K50 or Ortiz. The key parameters are the length of the capillary tube and the operating temperature range. For two-chamber models, thermostats with markings indicating operation in the range of positive temperatures of the refrigeration chamber are usually used.
Pay attention to the number of contacts. In two-compressor models there may be two or three. If you purchased a thermostat with three contacts and your refrigerator has two, the third contact is simply isolated and not used. However, the reverse situation (when there are fewer contacts than necessary) is unacceptable.
It is recommended to purchase original spare parts or certified analogues specifically designed for equipment Atlant. Cheap Chinese copies may have a calibration error of up to 5-7 degrees, which will lead to excessive energy consumption or food spoilage.
Is it possible to install a thermostat from another refrigerator model?
Theoretically, it is possible if the dimensions, tube length and temperature range match. However, thermostats from single-compartment refrigerators often have a different response range (lower temperatures), which will lead to constant frost in the refrigerator compartment. It is better to look for spare parts marked for two-chamber models.
How often do you need to change the thermostat?
The service life of the thermostat is on average 5-7 years of intensive use. However, with frequent power surges in the network or mechanical damage, it may fail earlier. A scheduled replacement is not required; they are replaced only when signs of malfunction appear.
Why did the refrigerator start to work louder after the replacement?
The thermostat itself does not affect the noise level of the compressor. If noise appears, check whether the new sensor housing is vibrating against the wall of the refrigerator, or whether the capillary tube is touching other elements. It is also possible that the compressor simply turns on more often due to the initial setting at a lower temperature.