Many owners of household appliances are faced with a situation where there is plenty of free space in the freezer, but there is nowhere for an apple to fall in the refrigerator compartment. A logical question arises: is it permissible to reconfigure the freezer to above-zero temperatures for storing chilled foods? Theoretically, this is technically possible, but it requires intervention in the operation of the climate control system and an understanding of the operating principles of the compressor. The standard operating mode of the freezer involves creating and maintaining a temperature from -18°C to -24°C. To do this, the equipment operates at the limit of its capabilities, often switching on and off in short cycles or running continuously but with low evaporator load. Turning it into a refrigerator will require a radical change in the operation logic of compressor.
The standard operating mode of the freezer involves creating and maintaining a temperature from -18°C to -24°C. To do this, the equipment operates at the limit of its capabilities, often switching on and off in short cycles or running continuously but with low evaporator load. Turning it into a refrigerator will require a radical change in the operating logic thermostat.
The main difficulty lies in the fact that the design of the evaporator and the power of the compressor are designed for deep cold. If you try to raise the temperature to +2...+5°C, the system may begin to work incorrectly, or the food may begin to deteriorate due to insufficient cold, or, conversely, freeze. It is important to understand the difference between No Frost and the drip system, since in the first case the risk of over-drying food if the settings are incorrect is much higher.
Technical differences between operating modes
To understand whether it will be possible to start the freezer in “warm” mode, you need to understand the physics of the process. In a conventional refrigerator, refrigerant circulates through the system, taking heat from the chamber and releasing it to the environment through the condenser. In the freezer, this process occurs more intensively or for a longer time in order to achieve extremely low values.
The key element here is thermostat or the electronic control module. It is he who commands the compressor to turn on when the temperature rises above a predetermined threshold. In freezers, this threshold is set well below zero. If you simply change the setpoint, the compressor will turn on less often, but the duration of its operation may remain the same, which will lead to overcooling.
⚠️ Attention: When changing the temperature regime with old mechanical thermostats, there is a risk of contacts “sticking” or incorrect display of the real temperature inside the chamber, since the device scale is not calibrated for positive temperatures values.
Modern models with electronic control (Electronic Control System) allow more flexibility in setting parameters, but even there factory restrictions may block temperature settings above -10°C or -12°C. This is done for a reason: the design of the seals, thermal insulation and even the type of oil in the compressor are optimized for a specific load range.
Another important aspect is the operation of the system No Frost. In freezers, it is set to remove moisture at very low temperatures. When switching to the positive mode, the air humidity inside the chamber will increase sharply, which can lead to the formation of condensation on the products and walls, as well as more frequent defrosting cycles that are not intended for such temperatures.
How to change the temperature in the freezer
If you are determined to use the freezer to store food at a temperature of about 0°C, you will have to interfere with the settings. In models with mechanical control, this often means replacing the thermostat itself with an analogue with different response parameters, or physically adjusting the rod, which requires high qualifications.
In devices with electronic control, the process looks simpler, but requires access to the service menu. This is usually done through a combination of buttons on the control panel. For example, holding the "Defrost" and "Temperature" buttons for 5-10 seconds can put the device into engineer mode.
Inside the service menu you need to find the parameter responsible for the target temperature of the evaporator or chamber. It is often designated as Target Temp or Set Point. When changing the value, you need to be extremely careful: the change step can be 0.5°C or 1°C.
After changing the settings, be sure to use an external thermometer for control. Built-in sensors may show incorrect values because their calibration is out of alignment with the new operating mode. Place the thermometer in the center of the chamber, away from the walls, and leave for 24 hours.
☑️ Electronics reconfiguration algorithm
Risks for the compressor and cooling system
The most the vulnerable element of the refrigeration circuit is compressor. When operating in abnormal mode, when it is necessary to maintain a temperature significantly higher than the calculated one, a “fluid motion” effect may occur. This is a condition when liquid enters the compressor instead of gaseous freon, which leads to water hammer and mechanical destruction of the valves.
In addition, the oil circulating along with the refrigerant has a certain viscosity, depending on temperature. In deep freezing mode, oil of one viscosity is used. As the temperature in the system increases, the properties of the lubricant change, which can lead to insufficient lubrication of the rubbing pairs and overheating of the motor.
Frequent switching on and off (clocking) is another problem. If the thermostat is not set correctly, the compressor may start to cycle in short cycles. This is detrimental for electric motors, since the starting currents are high, and the cooling of the windings does not have time to occur. This is a direct path to combustion of the winding or start relay.
| Parameter | Normal mode (Frost) | Refrigerator mode (Modified) | Risk |
|---|---|---|---|
| Temperature | -18°C ... -24°C | +2°C ... +6°C | Supercooling of products |
| Cyclicity | Long pauses | Frequent switching on | Wear of starting equipment |
| Humidity | Low (sublimation) | High (condensation) | Packaging damage, ice |
| Compressor load | Medium/High | Low (risk of fluid movement) | Water hammer, breakdown |
Particular attention should be paid to the system defrosting. Defrost heating elements in freezers are more powerful and are designed to thaw a dense layer of ice. In refrigerator mode, they can overheat the air, causing temperature surges that are detrimental to many products.
Impact on food storage
Even if it is technically possible to adjust the temperature, the question of the safety of the contents arises. Freezers, even in refrigerator mode, often have a more aggressive air circulation system. This leads to rapid removal of moisture from the products, especially if they are not sealed.
Vegetables and fruits in such conditions can wilt in a couple of days. Meat and fish, which are stored in a regular refrigerator for several days, in a freezer with its specific atmosphere can become covered with mucus or change color faster than usual due to fluctuations in humidity.
What products absolutely cannot be stored in a reconfigured freezer?
Dairy products (kefir, milk) are very sensitive to temperature changes and can sour or separate even with a short-term increase in temperature above +6°C. Also, you should not store open products with a strong odor, since the ventilation system will quickly spread the aroma throughout the chamber, and it will be difficult to remove it.
It is also important to take into account the distribution of temperature zones. A typical refrigerator has freshness zones, a vegetable zone, and a standard shelf. In a converted freezer, the temperature field may be non-uniform: it will be colder near the back wall, warmer near the door. This creates a risk of local freezing of food near the evaporator.
Use sealed containers. If you do use the freezer as a refrigerator, Products must be packaged in containers with tight lidsto minimize contact with dry, circulating air and prevent moisture loss.
Economic feasibility of reworking
It is worth thinking about whether remanufacturing makes sense. The energy consumption of a freezer in refrigerator mode may be higher than that of a conventional refrigerator of the same capacity. This is due to the fact that the thermal insulation of freezers is usually thicker, and the control system is less effective for positive temperatures.
The service life of equipment during operation in abnormal conditions is reduced. A compressor designed to operate at certain pressures will experience loads not intended by the manufacturer's engineers. This can lead to failure in 1-2 years, whereas in normal operation it would last 10 years.
If the reason for the modification is a lack of space, it may be cheaper and safer to purchase a compact refrigerator or chest freezer with a switch function (if such a model is available on the market). Some modern models Liebherr or Bosch have a factory function "VarioZone" or similar, which allows you to legally change the temperature.
⚠️ Attention: Independently flashing the controller or replacing the thermostat almost always leads to loss of warranty. If the equipment is new, it is better to consider other storage options.
Alternative solutions and conclusions
Instead of risky alteration of existing equipment, experts recommend considering the purchase of additional equipment. The market offers many compact models that will take up minimal space and work reliably. However, if the situation is hopeless and the freezer is idle and there is no space in the refrigerator, the experiment is possible, but with precautions taken.
The main rule: do not store temperature-sensitive products in such an improvised refrigerator (baby food, meat for raw consumption, perishable delicacies). Use this capacity to stock up on pickles, drinks, packaged vegetables, or foods you plan to consume in the next 24 hours.
Regularly check the temperature inside the chamber with an external thermometer. Do not rely on the control panel indicators as they may lie when operating outside of normal ranges. Watch out for the formation of ice: if there is a lot of it, it means that the defrost cycle is broken, and you need to defrost the chamber manually.
Is it possible to completely turn off the freezer and use it as a cabinet?
You can use the freezer without plugging it in only as a regular cabinet for storing dry food or dishes. If you turn it on without cooling, mold and an unpleasant odor will quickly appear inside due to organic residues in the thermal insulation and hard-to-reach places in the ventilation system. Careful drying and ventilation is required for several days.
Why does food in the freezer freeze even at a setting of +5°C?
This is due to the inertia of the system and the location of the sensor. The sensor may assume that the chamber is +5°C, but the temperature directly at the outlet of the cold air from the evaporator may be -10°C. Products caught in this zone freeze. The solution is not to place food close to the back wall and use buffer containers with water to stabilize the temperature.
Is infrequent activation harmful to the compressor?
Yes, for some types of compressors (especially old ones), infrequent operation is harmful. Oil can drain to the bottom of the system, and if it is rarely started, the compressor will run for some time without proper lubrication. In addition, moisture can accumulate in the system, which during rare operation cycles does not have time to evaporate, causing corrosion from the inside.
How often should such a “hybrid” be defrosted?
The frequency of defrosting depends on the humidity of the food and the frequency of opening the door. In refrigerator mode, moisture falls out more actively. It is recommended to carry out preventive defrosting and washing at least once every 2-3 months, even if there is little visible ice. This will prevent the appearance of bacteria and odors.