Many owners of household appliances of the brand Atlant face a situation when they find inside the refrigerator compartment strange control or button. The question often arises: why is the switch needed in the Atlant refrigerator, if, it would seem, the device should work constantly? Lack of understanding of the purpose of this unit can lead to improper operation or even damage to food. In most cases, we are not talking about a simple switch, but about a complex thermostat or mode switch that controls the operation of the compressor.
The design of Belarusian refrigerators provides for different types of control depending on the year of manufacture and series models. This can be a classic mechanical rotary controller, a push-button unit or an electronic module. It is important to understandthat this particular element is responsible for maintaining the set temperature. If it fails, the compressor will either stop starting or will work non-stop, which will lead to freezing of the evaporator.
In this article we will analyze in detail the functional purpose of various types of switches, their design and typical malfunctions. Diagnostics these components do not always require calling a technician, many problems can be solved independently, having basic knowledge about the of the electrical circuit refrigerator. Let's figure out how to properly configure the device and when a part needs to be replaced.
Basic functions and purpose of the switch
The main task of any control element in the refrigerator is to open and close the electrical power supply circuit of the compressor. However, depending on the type of Atlant refrigerator, the functions may differ. In single-compressor models with a No Frost or drip defrosting system, this element often combines the functions of a thermostat and a “Frozen” mode switch. Thermostat monitors the temperature in the chamber and turns off the motor when the specified limit is reached.
In two-chamber two-compressor models, the situation different. There may be a separate refrigerator compartment switchpresent here. It allows you to forcefully turn off one of the cooling circuits, for example, if you go on vacation and leave the refrigerator empty, but do not want to defrost the freezer. This significantly saves energy. Switching mechanism in such cases it works independently of the main thermostat of the freezer compartment.
It is also worth mentioning the quick freezing buttons, which are often confused with conventional switches. When activated, the compressor operates continuously, ignoring the readings of temperature sensors, until the timer or the user himself turns off the mode. Circuit interlock in this state, it prevents the engine from stopping, which is necessary for shock freezing of large volumes of products.
⚠️ Attention: Never leave the mode continuous running the compressor on for longer than specified in the instructions (usually 24 hours). This can lead to overheating of the motor and failure start relay.
Varieties control elements in Atlant models
Atlant engineers have used various solutions over decades of production. Understanding your device type is essential for proper diagnosis. The main types can be divided into mechanical and electronic.
- 🔹 Mechanical thermostats: Classic version with a rotary knob and a scale from 1 to 7 (or Min/Max). Inside there is a bellows tube that responds to changes in freon or air pressure. These are reliable, but gradually becoming obsolete temperature sensors.
- 🔹 Push-button switches: Often found in older two-chamber models. They are keys that physically open contacts. They are characterized by a clear click and the ability to visually assess the position (pressed/extruded).
- 🔹 Electronic modules: Installed in modern series. There is no physical breaking of the chain by the user's fingers; the signal is sent to electronic control unit, which already commands the compressor. Such systems are more accurate, but more difficult to repair.
- 🔹 Touch panels: Found in premium lines. They react to touch and have no mechanical movement. Often combined with a display that displays the current temperature in degrees Celsius.
Each type has its own operating characteristics. Mechanics are more resistant to power surges, while electronics require a stable network. Bellows tube a mechanical thermostat is very sensitive to damage: even a microscopic crack will lead to leakage of filler gas and failure of the device.
Principle of operation of the thermostat and connection diagram
To understand why a switch is needed, let's consider its internal logic. A mechanical thermostat is based on a sealed system filled with gas or liquid. The capillary tube of the thermostat is attached to evaporator inside the chamber. When the temperature drops, the gas is compressed, the pressure in the bellows drops, and the contacts open - the compressor stops. When heating, the process occurs in the reverse order.
The connection diagram in the Atlant refrigerator usually looks like this: the phase wire from the socket goes to the thermostat input. When the contacts close, current flows to start-up protection relay the compressor. In two-chamber models with one compressor, an electromagnetic valve is added that switches the flow of refrigerant between the chambers, and its operation can also be controlled by a common controller or mechanical switch.
In models with a separate refrigeration chamber switch, the principle of operation is simplified to a banal circuit break. When you press the "Off" button, you physically open the contact going to the upper chamber thermostat. The motor-compressor of the lower compartment (freezer) continues to operate normally, maintaining a low temperature.
Why does the thermostat click?
The characteristic click that you hear when the refrigerator is operating is the sound of the contacts opening or closing inside the thermostat. If the clicks become too frequent or, on the contrary, disappear, and the temperature changes, this is the first sign of a malfunction contact group.
Fault diagnosis: how to check the switch
If the refrigerator stops cooling or, conversely, freezes too much, the problem may lie in the control element. Before disassembling the unit, it is necessary to carry out initial diagnostics. Checking contacts is the first step. For mechanical buttons and thermostats, you can use a multimeter in dial mode.
Signs of a malfunctioning thermostat or switch:
- ❄️ The compressor does not turn on at all, although the light inside the chamber is on (which means there is voltage, but the circuit is not closes).
- ❄️ The refrigerator works non-stop, a “fur coat” forms on the back wall, the food in the refrigerator compartment freezes (the contacts are stuck in the “On” position).
- ❄️ The compressor turns on for a few seconds and turns off with a click (the problem may not be switch, and in start relay, but it’s worth checking the control circuit).
- ❄️ The regulator scrolls endlessly or, conversely, is jammed and does not spin (mechanical destruction of the shaft).
To check, remove the handle regulator and plastic panel. Carefully remove the thermostat. Disconnect the wires (after photographing their position!). Ring the contacts: at room temperature they should ring (unless it is a thermostat that opens when warm, but in refrigerators the contacts usually close when warm). If the multimeter shows a break, the element is faulty. Also inspect capillary tube for creases and damage.
☑️ Primary fault diagnosis
Replacement instructions do-it-yourself thermostat
Replacing a failed thermostat is a procedure available to a home craftsman. However, it requires care and compliance with safety precautions. The main rule: all work is carried out only with the power supply completely disconnected from the mains! Discharging capacitors in the circuit is also desirable, although in simple Atlant circuits they may not be present.
The replacement process is as follows. First we dismantle the old element. Pay attention to how the sensing tube is secured: it can be inserted into a special hole in the evaporator plate or secured with a clamp. It must be pulled out carefully, without sudden jerks, so as not to damage the adjacent tubes of the refrigeration circuit. The new thermostat must be similar to the old one in markings (for example, TAM-133, K-59, etc.).
Installation of the new element is carried out in the reverse order. The tube is carefully inserted into the seat to a depth equal to the length of the old one (usually 40-60 mm). Secure the tube with standard fasteners. Connect the wires according to the diagram or color coding you made earlier. After assembly, turn on the refrigerator and check its operation: it should reach the temperature and turn off.
| Parameter | Mechanical thermostat | Electronic sensor |
|---|---|---|
| Principle of operation | Change in pressure gas in the bellows | Change in semiconductor resistance |
| Accuracy | Low (range 2-3°C) | High (up to 0.5°C) |
| Maintainability | Entire replacement | Replacement or flashing |
| Service life | 5-10 years | 10-15 years |
⚠️ Attention: When installing a new thermostat, make sure that the capillary tube does not touch sharp metal edges or moving parts of the fan (in No Frost). Vibration can grind thin copper, which will lead to filler gas leakage and repeated failure after a short time.
Typical errors during operation and setup
Users often make mistakes that shorten the life of switches and thermostats. One of the most common is to set the regulator to the maximum value (7 or Max) in normal mode. This forces compressor to work at the limit, and the thermostat contacts are under constant load, which leads to their burning.
Another mistake is ignoring defrosting. In older Atlant models with manual defrosting, ice adhering to the evaporator can block the sensitive thermostat tube. As a result, the sensor does not “feel” the real cold and does not turn off the engine. Regular defrosting (at least once every six months) prolongs the life of everything