A situation where isolated operation of the freezer compartment is required when the main compartment is turned off occurs quite often among owners of household appliances. Most often this is due to a breakdown of the thermostat in the refrigerator compartment, failure of the No Frost system, or simply a desire to save energy if the upper section is temporarily not needed. However, most household units are structurally designed as a single cooling circuit, which makes such a task technically complex and risky.
It is important to immediately understand that a standard button or switch for separate control is usually absent in basic models. Refrigerant circulates through a common system, and the compressor is controlled by sensors that may be located at different points. An attempt to rudely interfere with the electrical circuit without understanding the principles of operation Freon circuit can lead to motor failure or defrosting of supplies. In this article we will analyze all possible ways to implement such a scheme, from simple settings to complex technical modernization.
Before taking up the tools, it is necessary to evaluate the economic and technical feasibility of the idea. Sometimes it’s easier to buy a separate chest freezer or call a technician to replace the thermostat than to remodel a working but inconvenient unit. However, if the decision is final, below are proven methods.
Design Analysis: Single and Dual Compressor Systems
The first step to success is to accurately determine the type of device you have. 90% of the strategy for further actions depends on this. In modern apartments, models with one compressor predominate, where the cold is distributed between the chambers through a damper system or natural convection. In such systems evaporator often common, or freon first passes through the freezer and then cools the refrigeration compartment.
If you have a two-compressor model, the problem is solved trivially. Such units have two independent cooling systems, each with its own motor and circuit. You just need to turn off the power to one of the compressors or set the temperature in the refrigerator compartment to maximum, if the electronics allow. However, if there is only one compressor, it is impossible to physically turn off one chamber while leaving the other running using standard means.
⚠️ Attention: In systems with one compressor, an attempt to shut off the cold supply to one of the chambers without changing the compressor operation algorithm will lead to overheating of the motor or icing of the air ducts.
There is also an intermediate class of equipment - systems with one compressor, but two cooling circuits (Dual Cooling). Here the air does not mix, but there is still only one compressor. In such cases, manufacturers sometimes provide software for disabling one of the zones, but this is rare for the budget segment. Study the instructions for your model Indesit, Atlant or LG, looking for sections about "Holiday Mode" or independent zone control.
Software methods and thermoregulation settings
If your equipment belongs to the class of electronic controls, you should try to resolve the issue through the settings. Some advanced models allow you to set the temperature for each zone independently, even if the compressor is shared. The logic of the controller in such cases involves operating the compressor until the minimum temperature at the coldest point is reached.
Try to set the temperature in the refrigerator compartment to the maximum possible value (usually +8...+10°C), and in the freezer set the “Super Freeze” mode or the minimum possible temperature. This will force the unit to operate in a mode similar to that of a freezer only. However, there is a nuance here: if the temperature sensor that controls the activation of the compressor is located in the upper chamber, it may prevent the motor from starting if it is already warm there.
- 🌡️ Find the main thermostat: in mechanical models it is a knob, in electronic models it is a menu on the display.
- ❄️ Set the minimum cooling mode for the refrigerator compartment to minimize consumption cold.
- 🔌 Check for the Vacation function: this mode often turns off the refrigerator compartment, leaving the freezer to operate normally.
In mechanical refrigerators, such as older models Biryusa or Stinol, there are no software methods. Everything there is regulated by the physical position of the thermostat knob. If there is only one knob, it controls the temperature of the evaporator or outlet air, and it will not be possible to separate the flows without modifications.
Physical blocking of air flows
In No Frost systems, cold air is pumped by a fan from the evaporator hidden behind the back wall and distributed among the chambers through air ducts. Theoretically, by closing the damper leading to the refrigerator compartment, you can force all the cold to go only to the freezer. However, this will upset the balance of the system.
If you block the air flow into the upper chamber, the pressure in the duct system will change. The fan may begin to work harder, resulting in noise or damage to the fan motor. In addition, if the temperature sensor is in the refrigerator compartment, it will not sense the cold, and the compressor will work continuously, trying to cool the “heat” that in fact simply does not reach the sensor.
To implement this method you will need:
- 🛠️ Carefully remove the back panel of the refrigerator compartment.
- 🚧 Find the air duct connecting the freezer and the refrigerator compartment.
- 🧱 Make a plug from a heat-insulating material (penoplex, polystyrene foam).
- 🌬️ Make sure that the damper-regulator (if there is one) does not completely block the flow by itself yourself.
This method only works in conjunction with cheating the thermostat, which will be discussed below. Simply closing the hole in the air duct is not enough - the system must “think” that it is still warm in the refrigerator in order to continue freezing.
Modernization of the electrical circuit and thermostats
The most reliable, but also the most difficult way is to interfere with the electrical control circuit of the compressor. The essence of the method is to eliminate the influence of the refrigeration chamber temperature sensor on starting the engine. This requires skills in working with electricity and an understanding of circuit design.
In the classic circuit, the thermostat opens the compressor power circuit when the set temperature is reached. If you want the freezer to work and the refrigerator to "sleep", you need to have the compressor turn on based on a signal from the freezer sensor (or timer), ignoring the readings from the top sensor. In dual-circuit systems with one compressor, a solenoid valve is often used to switch the freon flow. By controlling this valve manually or through an additional controller, you can redirect the freon.
Consider the option with a mechanical thermostat. If you have a thermostat TAM-133 or an analogue, it has a capillary tube. If the tube is placed in the freezer evaporator, then the refrigerator operates at the freezer temperature. If the tube hangs in the air of the upper chamber, follow it. Transferring the tube to the freezer is a radical method that requires disassembling the evaporator and breaking the seal, which can lead to freon leakage.
⚠️ Attention: Any intervention in the electrical wiring must be carried out with the device completely disconnected from the network. Careless handling of live contacts is dangerous to life.
A safer, but soldering-requiring method is to install an additional thermostat in the open circuit of the main one. You set the new thermostat to the freezer temperature (for example -18°C). When the freezer warms up, the new thermostat completes the circuit and the compressor starts running, ignoring the condition of the upper chamber. However, the main thermostat must be unscrewed to minimum or short-circuited so as not to open the circuit prematurely.
☑️ Check before tampering with the electrical system
Done: 0 / 5Compatibility table of methods and types of refrigerators
To systematize the information and help you choose the right path, we have compiled a summary table. It shows the effectiveness of various methods depending on the design of your unit.
Refrigerator type Method "Settings" Method "Shutter" Method "Electrics" Risk of breakdown Two-compressor High (power off) Not required Not required Low No Frost (1 compressor) Medium (holiday mode) Medium (sensor deception required) High (complex circuit) Medium Drip (1 compressor) Low Low (disrupts convection) High (sensor transfer) High Industrial/Showcase Depends on the controller Possible Possible Average As can be seen from the table, owners of two-compressor models are luckier everything. For other cases, the safest option is to use the "Vacation" mode or buy a separate freezer. Intervention in the electrics of drip systems (the “crying effect”) often leads to the rear wall becoming overgrown with a “fur coat”, as the defrost cycle is disrupted.
If you decide to upgrade the electrics, be sure to use components with a current reserve. When starting, the compressor consumes current 3-5 times higher than the rated current, and a weak relay can burn out on the first night. Use a relay with a 220V coil and contacts of at least 16A.
Risks, consequences and alternative solutions
Before completing the article, you need to weigh the pros and cons. Forced operation of the refrigerator in abnormal mode reduces the life of the compressor. The motor is designed for certain on and off cycles. If you force it to work continuously or with very short pauses, the oil in the compressor may overheat, lose its lubricating properties, and the unit will jam.
In addition, the defrost cycle will be disrupted in No Frost systems. The defrosting heating element is turned on by a timer or hour meter. If you change the operation logs so that the compressor threshes constantly, the evaporator may freeze up faster than the defrost starts. The result is an icy cocoon on the fan, no air circulation and defrosting of food in the freezer after a few days.
- 📉 Reduced energy efficiency: the refrigerator will consume more electricity than a separate freezer.
- 🔊 Increased noise: the constant operation of the compressor and fans will be annoying.
- 💸 No warranty: any interference with the design voids the manufacturer's warranty obligations.
⚠️ Attention: Manufacturers of household appliances do not provide for operating the device in the “freezer only” mode for single-compressor models. You carry out all modernization actions at your own peril and risk.
As an alternative, consider purchasing a used freezer. This is often cheaper than repairing complex electronics or buying a new two-compressor giant. If the goal is simply to preserve food during a breakdown of the main compartment, it is better to use the maximum cold mode and open the refrigerator door more often to reset the temperature, although this is inconvenient.
What will happen if you do not turn off defrosting?
In No Frost systems, with constant operation of the compressor without defrosting cycles, the evaporator will be covered with ice. The fan will begin to hum, trying to break through the ice, and then stop. The cold will stop flowing into the chambers, and the food will defrost, despite the motor running.
Frequently asked questions (FAQ)
Is it possible to simply pull out the light bulb and seal the sensor in the refrigerator?
You can pull out the light bulb, this will turn off the light, but not the cooling. Taping the sensor (thermostat) in the refrigerator compartment with electrical tape or heating it with a hairdryer will make the compressor think that it is hot there. It will work continuously. This will cause food in the top compartment to become deep frozen and possibly cause icing, but the freezer will still operate. However, this is a temporary solution that is dangerous for the compressor.
Why does the refrigerator click but does not turn on after my manipulations?
The click indicates an attempt to start the start relay. If the compressor does not start, the thermal protection may have tripped due to overheating during previous experiments, or you may have broken the electrical circuit. Let the unit stand unplugged for 2-3 hours. If the clicking continues but there is no cold, the start relay or the compressor itself may have burned out.
Is there a difference for old refrigerators like "Don" or "ZIL"?
In older models ("ZIL", "Don", "Saratov") the design is simpler. There is often one thermostat that controls the temperature of the evaporator in the freezer (or air damper). If you turn the knob to maximum, it will freeze very much. But you cannot completely turn off the upper chamber - it will cool naturally from the freezer wall. Converting older models is easier due to the lack of complex electronics, but their energy efficiency during such operation will be extremely low.
Can the freezer work if the refrigerator is +25 degrees?
Yes, it can if the control system allows the compressor to turn on according to the temperature of the freezer. However, heat from the upper chamber will constantly penetrate downwards, causing the compressor to work more often. This is normal for a short period, but not for constant use.
How can I understand what kind of compressor I have without disassembling the refrigerator?
Listen to the sound of operation. If, when turned on, the hum is the same, but of different tones, most likely there is only one compressor. If you hear two different sounds of motors turning on at different times (or simultaneously), you have two compressors. Also, two compressors usually means two condenser grilles in the back (or one large one) and two thermostats inside. Look at the model on the Internet using the sticker inside the chamber - the specification will tell you exactly.