Many owners of household appliances are faced with a situation that seems paradoxical at first glance: the higher the number on the regulator, the warmer it becomes inside the chambers. This is puzzling, since in most other devices the logic is exactly the opposite - a larger number means more power or intensity. Understanding the principle of operation of the thermostat will help you correctly set the mode, save energy and extend the shelf life of products.
In this article we will analyze in detail the physics of the process, explain why manufacturers choose this particular scale marking, and give specific recommendations for setting values for various compartments. You will learn how thermostat interacts with the compressor and why the standard “5” or “7” do not always mean maximum cold.
In addition, we will touch on the topic of temperature zones inside the refrigerator. Even with the regulator set correctly, the temperature in different corners of the chamber can differ significantly. Knowing these nuances will allow you to correctly distribute food, preventing them from spoiling or, conversely, freezing.
The principle of operation of the thermostat: why the numbers work in reverse
To understand which number is colder in the refrigerator, you need to understand the mechanics of the control. A temperature controller, or thermostat, is essentially a switch that opens the electrical circuit when a certain temperature inside the chamber is reached. The scale on the handle or display is not degrees Celsius, but conventional units of cooling power or, conversely, the response threshold.
In classic mechanical models that use a rotary knob with numbers from 1 to 7 (or from Min to Max), the logic is as follows: a lower number corresponds to weaker cooling. When you set it to "1", you are telling the compressor to turn off as soon as the temperature rises just above freezing. Consequently, the refrigerator works little and is relatively warm inside.
When you increase the value of the regulator, you allow the temperature to drop lower before the thermostat signals to stop the motor. Thus, the higher the number, the longer it works compressor and the lower the final temperature in the chamber. However, there is an important nuance here: the maximum value (for example, 7) often puts the equipment into constant operation or “super-freezing” mode, which may be excessive for everyday storage.
⚠️ Attention: In some modern electronically controlled models, the scale may be calibrated in degrees Celsius. In this case, the reverse logic applies: the lower the number (for example, +2°C), the colder, and the higher (+8°C), the warmer. Always check the instructions for the specific model.
Deciphering the scale: from Min to Max and from 1 to 7
Standard marking of regulators in most refrigerators, such as Indesit, Atlant or Beko, uses the range from 1 to 7 or Min/Max notation. Let's look at what each value means and what temperature condition it approximately sets.
The position Min or number 1 means minimum cooling. In this mode, the compressor turns on rarely, maintaining the temperature in the region of +8..+10°C. This is an energy saving mode, but it is not cold enough to store perishable foods such as meat or dairy products. This mode is suitable for storing vegetables in large volumes or when the refrigerator is almost empty.
Average values (3-4) are considered optimal for everyday use. The standard range of +3..+5°C, which is recommended by sanitary standards, is maintained here. Maximum values (6-7 or Max) force the unit to work almost non-stop, lowering the temperature to 0°C and below, which can lead to freezing of products in the main chamber.
Below is a table showing the approximate correspondence between the position of the regulator and the temperature inside the main chamber (assuming the equipment is in working order and normal loading):
| Position of the regulator | Operating mode | Approximate temperature | Recommendation |
|---|---|---|---|
| 1 (Min) | Minimum | +8..+10°C | Transportation, empty refrigerator |
| 3 | Average (Normal) | +4..+5°C | Daily food storage |
| 5 | Reinforced | +2..+3°C | Hot weather, heavy load |
| 7 (Max) | Maximum | 0..+1°C | Fast freezing (short-term) |
What happens when installed on MAX?
If you leave the regulator at the maximum number (7 or Max) for a long time, the compressor will work continuously. This leads to increased energy consumption, motor wear and the formation of an ice crust on the rear wall. Products near the back wall may freeze, losing their taste.
Temperature zones inside the refrigerator compartment
Even if you correctly answered the question “at what number is it colder in the refrigerator,” the design of the refrigerator creates different microclimatic zones, and the placement of products must correspond to these conditions.
The coldest place is traditionally located at back wall (especially in models with a drip defrosting system) and on the bottom shelf. Here the temperature may be 2-3 degrees lower than set. This is where raw meat, fish and opened dairy products should be stored. If you set the regulator to “5”, food may become covered with ice at the back wall.
Door shelves are the warmest zone. The temperature here fluctuates the most due to frequent opening of the door and contact with the warm air of the kitchen. It is best to place sauces, drinks, canned foods and eggs here that do not require strict temperature conditions.
- 🥩 Bottom shelf: ideal for raw meat, fish and poultry, where the temperature is minimal.
- 🥛 Middle shelves: designed for prepared foods, dairy products, sausages and cheeses.
- 🥤 Shelves on the door: suitable for sauces, juices, water and products with a long shelf life.
- 🥬 Drawers (freshness zone): vegetables and fruits that need high humidity and a temperature of about +8°C are stored here.
How to properly configure the refrigerator depending on the season
The external ambient temperature directly affects the efficiency of the refrigerator. In the summer, when the kitchen is hot, heat exchange is difficult and the compressor takes longer to cool the chambers to the set level. In winter, the situation is reversed.
In summer, it is recommended to set the regulator to values 4-5. This will compensate for the high room temperature and ensure that the food is sufficiently cooled. However, make sure that the equipment does not work non-stop, otherwise the motor may overheat. If you feel that the refrigerator is humming continuously, try reducing the power to “3” and checking the temperature with a thermometer.
In winter, if the refrigerator is in an unheated room or near a window, external cooling helps the compressor. In this case, it is enough to set the regulator to “2” or “3”. Higher values will result in excessive cooling and possible freezing of food, as well as condensation.
Setting errors and their consequences
Incorrect setting of the thermostat is one of the most common causes of food spoilage and equipment breakdowns. Many users mistakenly believe that if you set the maximum number, the products will last longer. In practice, this leads to the opposite effect.
Constant operation at maximum power causes the evaporator to freeze. In models with drip system ice does not have time to thaw during rest cycles, turning into a block that blocks the access of cold. As a result, the products in the main chamber begin to deteriorate, although the compressor hums without interruption.
Another common mistake is changing settings frequently. Sudden changes in temperature are harmful to food. Set the optimal value (usually 3) and do not touch the regulator unless absolutely necessary, for example, when there is a sudden change in the temperature in the room or when the refrigerator is fully loaded with fresh food.
⚠️ Attention: If you have just loaded the refrigerator with a large amount of warm food, do not rush to turn the knob to maximum. It is better to arrange food with a gap for air circulation. Forced cooling of a large volume of warm air can “kill” the compressor.
☑️ Checking the correct setting
Features of electronic control systems
In modern models brands LG, Samsung, Bosch mechanical handles are becoming a thing of the past, giving way to electronic panels. Here the principle of “which number is colder” is transformed into an exact setting of degrees. However, there are some peculiarities here too.
Electronics often implement a function Eco Mode or “Eco”, which automatically sets the optimal temperature (usually +3..+4°C) for minimal energy consumption. There are also “Vacation” modes, when the main chamber operates at minimum mode (+10..+15°C), and the freezer functions normally.
It is important to distinguish between the settings for the refrigerator and freezer compartments. In two-compressor models they are regulated independently. In single-compressor systems No Frost a change in temperature in the freezer can affect the cold in the main compartment, since cold air is pumped from there.
FAQ: Frequently asked questions
Why does the refrigerator get very cold at number 3?
This may indicate a malfunction of the thermostat (it is “stuck” when on) or a lack of refrigerant, which causes the compressor to work longer than usual. Also check if the food is pressed against the back wall.
Is it possible to keep the refrigerator constantly at maximum (7)?
It is strictly not recommended. This will lead to rapid wear of the compressor, excessive energy consumption and freezing of food. The maximum mode is intended only for short-term freezing (Super Freeze mode).
What to do if all numbers show the same temperature?
Most likely, the thermostat or temperature sensor has failed. In this case, the compressor either does not turn on at all or runs continuously. A call to a technician is required to replace the part.
Does the number of products affect the number setting?
Yes. A fully loaded refrigerator holds cold better, so you can reduce the power (set to 2-3). An empty refrigerator heats up faster when opened, so a slightly more intense mode may be required (4), but not for long.