Users are often faced with a situation when food in the refrigerator compartment begins to freeze or, conversely, deteriorate due to insufficient cooling. At this moment, the question arises about adjusting the operation of the unit, and many are lost, trying to understand the logic of controlling the mechanical regulator. The direction of rotation of the thermostat knob directly affects the operating mode of the compressor, but an intuitive understanding of this process often fails, since the markings on the scales of different manufacturers may differ or be completely absent.
Figureing out which way to turn the thermostat is necessary to maintain an optimal microclimate inside the chamber. Incorrect setting can lead to increased energy consumption and premature wear motor-compressor. In this article, we will analyze in detail the principles of operation of mechanical regulators, consider the features of scales of different brands and give clear instructions for calibrating the temperature.
Understanding the principle of operation of the thermostat allows you not to guess, but to know exactly what effect you will achieve by turning the lever. Thermostat (or thermostat) is a sensor, which monitors the temperature inside the evaporator or chamber air and issues a command to turn the compressor on or off. Mechanical adjustment changes the response threshold of this sensor, causing the refrigerator to work longer or turn off more often.
The principle of operation of a mechanical thermostat
A mechanical thermostat is a device that responds to changes in pressure inside a sensitive tube filled with refrigerant. When you turn the control knob, you physically change the tension of the spring inside the mechanism. This tension determines at what pressure (and, accordingly, temperature) the contacts will close, starting the compressor, or open, stopping it.
The main task of the regulator is to maintain a given temperature range. If you want to make the cold more intense, you need to change the settings so that the compressor turns on at a higher temperature and turns off at a lower temperature. This requires longer operation of the unit. And vice versa, to save energy and reduce cold, the operating cycle should be shorter.
It is important to understand that the scale on the thermostat handle is not a thermometer, but a conditional indicator of cooling power. The numbers 1 to 7 (or Min to Max) indicate the degree of spring tension, not specific degrees Celsius. Therefore, the answer to the question “which way to turn” depends on what result you want to get: more cold or less.
⚠️ Attention: Sharp turns of the thermostat knob to maximum values can lead to “sticking” of the contacts or mechanical damage to the rod. Adjust the temperature smoothly, taking pauses between turns to stabilize the pressure in the system.
Which direction to turn to increase cold
If the food in the refrigerator is not cooled enough, it is necessary to increase the operation of the compressor. To do this, turn the thermostat knob towards increasing numerical values or towards the inscription Max (Maximum). In the vast majority of refrigerator models, such as Indesit, Atlant or Beko, an increase in the number corresponds to increased cooling.
When you turn the knob clockwise (to the right), you increase the spring tension. This causes the contacts to close earlier, meaning the compressor will turn on when the temperature in the chamber is still relatively high, and turn off only when it reaches very low values. Thus, the unit works longer and more intensively.
However, it is worth considering that setting the regulator to the maximum value (usually 6 or 7) does not mean that the temperature will instantly drop to extreme levels. This is just a command to the system to operate at maximum load. If the refrigerator is working properly, but there is not enough cold even at maximum, the problem may lie in a freon leak or compressor wear, and not in the settings.
Setting to the minimum temperature and saving energy
In situations where an ice crust forms in the refrigerator on food or on the back wall of the chamber, it is necessary to reduce the cooling intensity. To do this, the thermostat knob should be turned towards decreasing numerical values, towards the number 1 or inscription Min (Minimum). Usually this movement is counterclockwise (to the left).
By reducing the spring tension, you increase the compressor shutdown threshold. The unit will turn off earlier, preventing the temperature from dropping too low. This not only saves food from freezing, but also significantly reduces energy consumption, since the motor runs less time.
In the summer, when the ambient temperature (room temperature) is high, it may seem logical to turn the knob to maximum. However, this is a mistake. In hot weather, the refrigerator already works under increased load, and setting the maximum mode can lead to continuous operation of the compressor without stopping, which can lead to overheating and breakdown. In the summer, it is optimal to keep the regulator at medium values.
Deciphering the symbols on the thermostat scale
Different manufacturers use different marking systems for thermostat scales, which often causes confusion. Understanding these symbols is critical to proper setup. Below is a table to help you navigate the values.
| Designation | Value | Rotation effect | Example of brands |
|---|---|---|---|
| Numbers 1-7 | 1 — min. cold, 7 — max. cold | To the right (clockwise) - colder | Indesit, Atlant, Stinol |
| Min / Max | Min - weak, Max - strong | To Max - colder | Beko, Candy, some Liebherr |
| Points (•) | One point - weak, many - strong | More points - colder | Old ZIL models, Saratov |
| Snowflakes | Number of snowflakes = power | More snowflakes - colder | Some Electrolux models |
It is worth noting that some modern models with electronic control may not have a mechanical handle at all. In such cases, adjustment is made through the display on the door or a hidden control panel, where you set a specific temperature in degrees Celsius. Here the “torsion” principle does not apply, since control is carried out by an electronic module.
If your thermostat has no numbers or letters, but only a risk (dash) in the middle, then turning in one direction will increase the cold, and in the other - decrease it. To determine the direction, make a slight turn (10-15 degrees) in one direction and wait a few hours, monitoring the temperature with a thermometer.
What do the red and green zones on the scale mean?
Sometimes you can see colored sectors on the thermostat scale. The green zone usually indicates normal operation, and the red zone is the risk or maximum load zone in which the refrigerator should not operate continuously. Having the handle in the red zone is only permissible for short-term intensive cooling (Super Freeze mode).
Specifics of adjustment in refrigerators of different brands
Each manufacturer of household appliances has its own established standards in the design of control interfaces. Although the physical principle of operation of the thermostat is the same, the visual implementation may differ. Let's consider the features of popular brands.
In refrigerators Indesit i Atlant the most common scale is from 1 to 5 or from 1 to 7. The golden rule applies here: the higher the number, the stronger the cold. The factory setting is usually at division 3. Turning the knob to the right increases the cold, to the left - decreases it. This is a classic scheme that is understandable to most users.
Technique Liebherr and Bosch often uses more complex symbols, sometimes combining a mechanical handle with indicators. In some Liebherr models the scale can be from 1 to 9, where 1 is the warmest position and 9 is the coldest. It is important not to confuse these values, since setting it to 9 in an empty refrigerator can lead to rapid accumulation of ice on the evaporator.
⚠️ Attention: In two-compartment refrigerators with one compressor, there is often only one thermostat that regulates the temperature in the refrigerator compartment. The freezer compartment is cooled “by the residual principle.” If you turn the knob to minimum, the freezer will also become warmer and food may begin to defrost.
Algorithm for correct temperature setting
To set up the refrigerator correctly and avoid mistakes, you should follow a certain sequence of actions. Randomly twisting the knob back and forth will not give an accurate result, since the system requires time to react.
First you need to assess the current state. Place a regular glass liquid thermometer on the middle shelf of your refrigerator. Leave it there for several hours without opening the door often. This will give an objective picture of the current temperature.
Next, proceed according to the following plan:
- 🌡️ Measure the current temperature and compare with the desired one (optimally +3...+5°C).
- 🔧 Turn the thermostat knob one notch in the desired direction (to the right for cold, to the left for warmth).
- ⏳ Wait at least 2-3 hours (preferably a day) for the temperature to stabilize.
- 📉 Repeat the measurements. If the result is not achieved, repeat the procedure, again moving the knob one notch.
Do not try to set the ideal temperature the first time. The inertia of the refrigeration system is high. A sudden change in settings may cause you to “overshoot” the desired value and get the opposite effect.
☑️ Checking the thermostat settings
Typical errors when adjusting the thermostat
Many users make standard mistakes when trying to set up a refrigerator, which leads to ineffective operation of the equipment. One of the most common mistakes is trying to compensate for a malfunction with settings. If the refrigerator has stopped freezing due to a freon leak, turning the handle to the maximum will not help, but will only kill the compressor.
Another mistake is ignoring seasonality. In winter, when the apartment is cool, there is no point in keeping the thermostat at high values. And vice versa, in the summer, even if the room is hot, you should not set the regulator to “7” unless there is an urgent need for it (for example, for quick freezing).
Also, users often forget that the chamber is full. An empty refrigerator cools faster, but it also loses cold faster when the door is opened. If the chamber is crowded with food, the thermostat may respond more slowly because the temperature sensor may be blocked by food. In this case, the setting requires more careful control.
Frequently asked questions (FAQ)
What should you do if the thermostat knob turns endlessly?
If the knob rotates without clicks and without resistance in both directions, this is a sign of a breakdown of the thermostat itself. Most likely, the spring burst or the rod came off. In this case, temperature adjustment is not possible; replacement of the part is required.
Is it possible to completely turn off the refrigerator with a thermostat?
Many mechanical thermostats have a “0” or “Off” position, which opens the electrical circuit and turns off the compressor. If there is no such position, complete shutdown is only possible through a socket or a general power switch.
Why is there not a few hours after adjusting the cold?
The refrigerator needs time (from 2 to 12 hours depending on the model and load) to reach a new temperature regime. Do not rush to turn the knob again, let the equipment work out the cycle.
Does the position of the thermostat affect the formation of ice?
Yes, directly. If the cold is set too high (maximum values), the evaporator will cool below the dew point more actively, which will lead to increased formation of frost and ice, especially in No Frost systems when defrosting is faulty or in drip systems.
Where is the thermostat located in modern models?
In older models, the handle is located inside the refrigerator compartment. In modern refrigerators, the mechanical regulator is often hidden in the upper part of the case (above the top shelf) or replaced by an electronic control panel on the outside of the door.