Replacing the thermostat in the Atlant refrigerator: complete instructions

Sudden defrosting of products or, conversely, their freezing into an ice block are sure signs that thermoregulation system has failed. In brand refrigerators Atlant, which are famous for their reliability, it is the thermostat that often causes unstable operation of the climate chamber. If you notice that the compressor works without interruptions or does not turn on at all, ignoring the settings, most likely this component needs to be replaced.

Independent installation of a new temperature controller is a real opportunity to save a significant amount on calling a technician, since the procedure is not technically complicated, but requires attention to detail. You do not need complex electronic measuring instruments, just a basic set of tools and an understanding of the operating principle refrigeration circuit. The main thing is to act consistently and observe precautions when working with electricity.

In this article we will analyze in detail the process of diagnosing, selecting and installing a thermostat for various models. Atlant. We will look at the nuances of connection, typical mistakes of beginners and provide reference data that will help you carry out repairs efficiently. A correct replacement will restore the factory operating mode of your refrigerator.

Diagnostics of a thermostat malfunction

Before disassembling the unit, you need to make sure that the problem lies in the thermostat, and not in a freon leak or a compressor malfunction. The main symptom of failure thermostat is a violation of the cyclical operation of the engine. If the refrigerator hums continuously without turning off, and at the same time a “fur coat” has formed in the chamber or the food is covered with frost, this is the first alarm bell.

The opposite situation also indicates a breakdown: the compressor is silent, the temperature in the chamber rises, and the food begins to deteriorate, although the light bulb inside is on. In some cases, the thermostat may “lie” by turning off the unit too early, when the temperature has not yet reached the desired values. For an initial check, you can try knocking on the regulator knob or sharply turning it from one extreme position to another - if you hear a click and the motor starts, it means that the contacts inside are stuck.

⚠️ Attention: Before starting any diagnostics, be sure to disconnect the refrigerator from the electrical network! Working with live electrical wiring is strictly prohibited and is life-threatening.

For a more accurate check, technicians often use the exclusion method. If you have access to a multimeter, you can “ring” the thermostat contacts. In normal condition (at room temperature), the contacts should be closed, and the device will show zero or a resistance value close to it. If the circuit is open, and the sensor temperature is room temperature, it is faulty and requires replacement. thermostat is faulty and needs to be replaced.

Preparation of tools and selection of components

The success of the operation directly depends on the correctness of the selected spare part. Thermostats for refrigerators Atlant may differ in the length of the capillary tube, the type of rod and the location of the contacts. Most often, these models use thermostats of the TAM series or their modern analogues. An incorrectly selected length of the tube can lead to incorrect reading of the evaporator temperature.

To carry out the work, you will need a minimum set of tools, which is found in the garage of most men. Don't forget to prepare a container to collect water, as there may be a lot of it during defrosting. A flashlight is also useful to better see the internal structure of the camera and electrical connections in hard-to-reach places.

List of necessary equipment:

• 🔧 A set of screwdrivers (flat and Phillips) for removing panels.
• 🔪 A sharp knife or side cutters for carefully cutting off the old tube (if will be required).
• 🧤 Gloves to protect hands from sharp edges and cold.
• 📏 Ruler or tape measure for measuring the length of the capillary.
• 🔦 Powerful flashlight for illuminating the internal cavity.

⚠️ Attention: Capillary The thermostat tube is filled with refrigerant and is under pressure. Do not heat it with an open fire or bend it at an acute angle to avoid depressurization.

Removing the old thermostat

The removal process begins with providing access to the assembly. In refrigerators Atlant with a top freezer, the thermostat is usually located inside the refrigerator compartment, in a plastic box under or next to the light bulb. In No Frost models, access can be hidden behind a decorative panel on the ceiling of the chamber or behind the rear wall.

First you need to remove the regulator knob. It may be a tight fit, so gently pull it towards you, you may have to wiggle it slightly. Under the handle you will see a fastening nut that needs to be unscrewed. After this, the entire thermostat block can be pulled out of the seat. Be careful: the capillary tube may be secured with clips to the evaporator, and sudden movement can damage it or the evaporator itself.

Next, disconnect the electrical wires. Before doing this, it is strongly recommended to photograph the connection diagram or mark the wires with a marker so as not to confuse them when installing a new element. Usually there are three wires: one goes to the compressor, one to the lamp (or second contact), and one common. Unscrew the protective cover, if any, and disconnect the terminals.

If the capillary tube is fixed to the evaporator, carefully release the fixing brackets. In some models Atlant the end of the tube is inserted into a special sleeve inside the chamber. It will need to be carefully removed. The old thermostat is completely removed when all contacts are disconnected and a path is cleared for the tube to be taken out.

Comparative table of thermostats

When purchasing a new spare part, it is important to focus not only on the name of the refrigerator model, but also on the marking of the thermostat itself. Different modifications Atlant can be equipped with different types of sensors. Below is a table to help you navigate the main parameters, although it is better to look at the exact markings on your burnt device.

Please note that the length of the capillary tube is a critical parameter. If you install a thermostat with a tube that is too short, the end may not reach the evaporator area and the refrigerator will not turn off. If the tube is too long, it will have to be carefully laid in rings inside the chamber, avoiding creases, which is not always convenient or aesthetically pleasing.

Is it possible to use a thermostat with a different tube length?

Yes, you can, but with restrictions. If the tube is longer, its excess is carefully rolled into a ring (at least 5 cm in diameter) and secured inside the refrigerator compartment in free space, away from moving parts and the heat source. If the tube is shorter, its use is not recommended, since the sensor will not correctly read the evaporator temperature, which will lead to incorrect operation of the compressor.

Installation and connection of a new thermostat

Installation of a new one thermostat begins with the positioning of the capillary tube. Carefully insert its end into the hole leading into the chamber and push it all the way until it touches the evaporator (or enters the sleeve to the desired depth, usually 40-60 mm). Secure the tube with standard clips or an aluminum plate, ensuring tight contact for better heat transfer.

Then install the thermostat housing in place. In models Atlant it is often secured through a rubber gasket, which prevents moisture and vibration. Make sure the body is level and not warped. Now is the time for the electrical connection. Accuracy is important here: use previously taken photographs or a diagram.

The standard connection diagram for most thermostats Atlant looks like this:

• 🔴 The wire coming from mains (phase), connects to a contact that is also connected to the defrost button (if there is one) or goes directly to the thermostat input.
• 🟢 The wire going to the compressor is connected to the output contact of the thermostat.
• ⚪ The third wire (if any) usually goes to the light lamp or quick freeze button.

After connecting the wires, check the reliability of the contacts. They should not wobble or spark. Assemble the plastic casing and install the decorative regulator handle. Make sure that the knob rotates smoothly, without jamming, and has clear “minimum” and “maximum” positions.

First start-up and setting the temperature

After assembling all the components, you can begin testing. Plug in the refrigerator. In the first minutes, you can hear a characteristic click - this is the relay activated, and the compressor should start. If the motor starts working, this is a good sign: the electrical circuit is assembled correctly. Let the unit operate for about 30-40 minutes without loading products.

Now you need to configure temperature mode. Turn the thermostat knob to the middle position. After an hour, check the temperature in the main chamber using a household thermometer. It should be within +2...+5°C. If the temperature is higher, add cold by turning the knob towards higher values. If food starts to freeze at the back wall, reduce the power.

⚠️ Attention: Do not try to set the ideal mode in the first 3-4 hours of operation. The refrigerator needs time (up to 24 hours) to stabilize the temperature background and enter the operating cycle, especially if it has been turned off for a long time.

Pay attention to the operating cycle: the compressor must be turned off periodically. If it runs non-stop for more than an hour, and the temperature in the chamber is already low, the capillary tube may not fit tightly enough to the evaporator, or the length is incorrect. In this case, the procedure will have to be repeated, paying more attention to the contact of the sensor with the cooling element.

Common errors when replacement

Even with instructions, beginners manage to make typical mistakes that nullify all efforts. One of the most common is damage to the capillary tube during installation. It is easy to cut a thin copper conductor with side cutters or bend it, which will lead to gas leakage from the thermostat bellows, and it will stop responding to temperature changes.

Another mistake is poor contact of electrical connections. If the terminals are loosely screwed on, the plastic at the junction will begin to heat up, which can lead to melting and even fire. Always check the tightness of the screws. They also often forget about grounding if the design of the refrigerator case Atlant provides for its connection via a thermostat (in older models).

Sometimes users misunderstand the principle of operation. They think that the number "5" on the handle means 5 degrees Celsius. In fact, this is a conventional power scale, where larger numbers mean lower temperature (more cold). Setting the maximum value in an empty refrigerator is a direct path to compressor failure due to continuous operation.

What to do if the refrigerator does not turn off after replacement?

Check the tight fit of the end of the capillary tube to the evaporator. If the contact is weak, the thermostat does not “feel” the cold. Also make sure that you have not bought a thermostat for the freezer (it has different response thresholds and will not turn off the compressor at above-zero temperatures in the refrigerator compartment).

FAQ: Frequently Asked Questions

Is it possible to temporarily do without a thermostat by shorting the wires directly?

Technically, you can start the compressor directly by closing the contacts going to the motor. However, this will turn your refrigerator into a continuous freezer. The compressor will work 24/7, which will lead to its rapid overheating and failure, as well as to freezing of food. This solution is only valid for 15-20 minutes for diagnostics or emergency cooling, but not for continuous operation.

Why does the new thermostat click, but the refrigerator does not turn on?

The click means that the contacts inside the thermostat are opening or closing, but this does not guarantee voltage is supplied to the compressor. Possible reasons: the compressor start relay is faulty, the motor itself has burned out, or there is no contact in the circuit to the thermostat (for example, a problem with the wiring or the defrost button). It is also worth checking the integrity of the wires going from the thermostat to the motor.

How to understand that the thermostat is “lying”?

If the refrigerator turns off when it is still warm in the chamber (food spoils), or turns on too late, when ice has already formed, then the calibration is broken. In factory thermostats, calibration adjustment is difficult; it is easier and more reliable to completely replace the unit with a new original analogue for your model Atlant.

Do you need to defrost the refrigerator before replacing?

Yes, complete defrosting is required. You need to not only empty the chambers, but also allow the ice to completely melt so that water does not get on the electrical contacts during disassembly. In addition, access to the attachment points of the capillary tube is often blocked by an ice crust, which will have to be chipped off, risking damage to the evaporator. It is better to spend a day defrosting than to repair a broken circuit.