Modern household appliances are often designed with maximum functionality in mind, and the presence of a two-compressor cooling system is a prime example of such engineering. Unlike single-circuit analogues, where the evaporator is common, here independent circuits you can control the temperature in the refrigerator and freezer compartments completely separately from each other. This opens up unique possibilities for the user, for example, completely turning off the freezer to save energy or increase the useful volume of the refrigerator compartment.
Many owners wonder whether it is possible to turn their unit into a large refrigerator, especially in the summer or when there is a temporary need to store a large number of products that do not require freezing. Two-compressor system technically allows you to do this without losing the functionality of the main unit. However, the process requires an understanding of the operating principles of thermostats and electronic control modules so as not to upset the pressure balance in the system.
In this article we will analyze in detail the algorithms of action for various types of control, consider the physical aspects of the operation of compressors and answer frequently asked questions. It is important to understand that design features your model may make its own adjustments, so carefully studying the manufacturer's instructions should always be the first step before making any changes to the settings.
The principle of operation of a two-compressor system
The fundamental difference between equipment with two motors is There are two completely autonomous refrigeration circuits. Each circuit has its own compressor, condenser, capillary tube and evaporator. This means that when you adjust the temperature in your freezer, you are working solely on one of the compressors, without affecting the operation of the main refrigerator compartment. This autonomy is a key factor that allows you to safely disable one of the modes.
In the standard operating mode, each compressor turns on and off independently, responding to signals from its temperature sensors. If the freezer compartment reaches a predetermined minimum, its compressor stops, even if there is an active cooling process in the refrigerator compartment right now. It is this independence that makes possible a scenario in which one circuit is working, and the other is completely de-energized or put into standby mode.
From a technical point of view, turning off the freezer does not create excess pressure in the main refrigerator system, since the refrigerants do not mix and circulate through separate lines. However, it is worth considering that heat transfer through the internal partition between the compartments will still occur, albeit slower than through the external walls of the case.
⚠️ Attention: Make sure that your model is actually equipped with two compressors. The presence of two doors or the No Frost system does not guarantee the presence of two motors. Check the technical data sheet or listen to the operation: if only one motor hums alternately louder and quieter, most likely you have a single-circuit system.
Disconnection methods through the control panel
The simplest and safest method of deactivating the freezer compartment is available in electronically controlled models. Manufacturers often provide a special mode, which may be called “Vacation”, “Eco”, or simply allow you to set the maximum temperature in the freezer. In such cases, you do not need to climb inside the case or turn mechanical controls.
For models with a display, the algorithm usually looks like this: you need to activate the setup mode (often a long press of the button is required), select the freezer section and set the temperature value to maximum. In some models Liebherr, Bosch or Siemens this value is indicated as “+5°C” or a special symbol indicating the freezer compressor is turned off.
- 🔹 Press the mode setting button and hold it for 3-5 seconds until the indication appears.
- 🔹 Select the freezer zone (usually indicated by a snowflake or the "F" symbol).
- 🔹 Use the value change button to set the temperature to +5°C or select the "Off" mode.
- 🔹 Confirm the action and wait until the panel returns to normal display mode.
If your control panel has a button with an image lock, it must be unlocked before starting manipulations. Often, users try to change settings without knowing that it is enabled, and think that the disable function does not work. After setting high temperatures, the freezer compressor will stop starting, and after a while the temperature inside will begin to rise. child lock, and think that the shutdown function does not work. After setting high temperatures, the freezer compressor will stop starting, and after a while the temperature inside will begin to rise.
Setting up mechanical thermostats
In old-style refrigerators or budget series, control is often carried out using mechanical thermostats. These are rotary knobs inside the camera, marked with numbers from 1 to 7 or the words “Min/Max”. In dual-compressor models, there may be two such handles: one for the refrigerator compartment, the second for the freezer. It is the second regulator that we will need.
To actually turn off the cooling in the freezer, the thermostat knob must be turned to the minimum cooling position. Usually this is the number “1” or the “Min” position. In some designs, there is an intermediate position between "0" (off) and "1", which is indicated by a dot or the word "Off". If you turn the knob all the way in the off direction, the freezer compressor will no longer receive a signal to start.
It is important to take into account the inertia of mechanical systems. After turning the knob, the compressor may not stop instantly if the cooling cycle is not yet completed. Thermostat it will only break the circuit when the temperature inside the evaporator reaches a preset threshold. Therefore, do not panic if the motor continues to hum for another 10-15 minutes after adjustment.
There is a nuance with models where there is only one thermostat, but it controls both compressors alternately (although this is rare for two-compressor systems, it occurs in transitional models). In this case, completely turn off the freezer, leaving the refrigeration compartment running It won’t work —the entire unit will turn off. Therefore, it is critical to ensure that there are two separate regulators.
Physical disconnection and energy consumption
Some users, in an effort to maximize savings, consider physically disconnecting the freezer compressor from the power supply. In two-compressor refrigerators, each motor has its own starting protection equipment and is connected to a common terminal block or through separate harnesses. Theoretically, by disconnecting the power supply of a specific compressor, you can achieve the desired result.
However, this method requires opening the technical compartment (usually located at the bottom of the refrigerator) and carries risks. First, you lose the warranty on the device. Secondly, modern electronic control modules can perceive a circuit break as a malfunction and go into emergency mode, ceasing to cool even the main compartment. In addition, there is a risk of electric shock if handled improperly.
In terms of energy consumption, turning off one compressor reduces energy consumption by approximately 40-50%, since a freezer operating at -18°C consumes a significant portion of the energy. If you set the temperature in the freezer to +5°C via the control panel, the consumption will also drop, but not to zero, since the light and electronics will continue to work.
| Parameter | Operation of both compressors | Freezer turned off (+5°C mode) | Physical shutdown of the motor |
|---|---|---|---|
| Energy consumption | 100% (basic) | ~55-60% of the base | ~50% of the base |
| Risk of breakdown | Standard | Minimal | High (loss of warranty) |
| Implementation complexity | Not required | Low (settings) | High (tool needed) |
| Influence on the main circuit | No | No | Electronics failures are possible |
⚠️ Attention: Manufacturers of household appliances do not provide for the user to independently open electrical circuits. Any tampering with the wiring is at your own risk and may result in a short circuit.
Impact on the main refrigerator compartment
When the freezer compartment stops cooling and its temperature is compared with the temperature in the refrigerator (or room temperature, if the door is often opened), the thermal balance of the entire device changes. The main camera will continue to operate normally, maintaining the set +2...+5°C. However, the load on the main compressor may increase slightly.
This is due to the fact that the common partition between the compartments will now allow more heat to pass from the “warm” freezer to the cold refrigerator. Thermal insulation The inner walls are usually thinner than the outer lining of the case, so the main motor will turn on a little more often to compensate for this heat gain. The difference will not be critical, but it exists.
It is also worth considering the distribution of cold air. In some models with the Total No Frost system, the fans can be separated, but in models with a weeping evaporator in the refrigerator compartment and a static freezer, the effect is minimal. The main thing is that the products in the main compartment do not lie close to the back wall on the side of the freezer if condensation has formed there.
What happens to the refrigerant in a disconnected circuit?
In a disconnected circuit, the refrigerant (freon) is simply at rest. The pressure equalizes to atmospheric or residual, there is no circulation. This is absolutely safe for the tubes and the condenser if the tightness of the system is not broken.
Features of defrosting when disconnected
If you turn off the freezer in which food was previously stored or there was simply ice present, the defrosting process will begin. In two-compressor systems with No Frost, the freezer usually has its own defrost heating element, but when the compressor is completely turned off and the temperature rises to positive, the ice will begin to melt naturally.
It is necessary to prepare a container in advance for collecting water or lay rags on the floor if the drainage system cannot cope with a large volume of melt water. Unlike scheduled defrosting, when we turn off the entire refrigerator, here the main compartment continues to cool, so water can only drip from the freezer. It is important to prevent water from entering electrical parts if the technical compartment is located below and poorly insulated.
After the chamber has warmed up, it should be thoroughly wiped and dried. Remaining moisture can cause unpleasant odors or mold, especially if you plan to keep the camera turned off for a long period of time. It is recommended to leave the freezer door ajarto allow air circulation and prevent mustiness.
- 🧊 Remove all food and ice from the freezer compartment before increasing the temperature.
- 🧹 Wipe the interior surfaces with a weak solution of soda to disinfect.
- 🌬 Leave the door ajar for 2-3 hours to dry completely.
⚠️ Attention: If you leave the refrigerator with the freezer door open for a long time, make sure it does not interfere with the passage and will not be accidentally slammed (for example, by a draft or children), damaging the seal or shelf.
FAQ: Frequently asked questions
Is it possible to turn off the freezer in a single-circuit refrigerator?
No, in single-circuit models (with one compressor), the cooling capacity is distributed between the compartments. Turning off the freezer will defrost the entire refrigerator or require closing the damper, which often leads to damage to the main compartment due to overheating.
Will running the freezer compressor without load (if it simply does not turn on)?
No, if the compressor does not turn on at the command of the thermostat or electronics, this is normal operation. The motors are designed for cyclic operation and long periods of downtime. Only frequent start-stop is harmful, but not the fact of idle time.
Is it necessary to defrost the freezer before switching to +5°C mode?
It is desirable. If there is a “coat” of ice inside, it will begin to melt as the temperature rises. It is better to remove the ice in advance to avoid leaks and speed up the process of reaching a new temperature regime.
Will there be electricity savings if you leave the freezer empty but working?
An empty freezer consumes less energy than a full one, but the difference is small. The main expense goes to compensate for heat inflows through the walls. Complete shutdown (or switching to +5°C mode) will give significantly greater savings than simply the absence of food.