Operation of household appliances is often faced with the need to fine-tune operating modes, and Polyus refrigerator is no exception. Proper temperature control is not just a matter of comfort, but is critical to maintaining food freshness and compressor safety. Many users mistakenly believe that it is enough to turn the knob at random, however, for different models, be it classic two-chamber units or more modern versions with the No Frost system, the algorithm of actions can vary significantly.
In this article we will analyze in detail the physics of the cooling process, the operating features of thermostats different generations and give clear recommendations for calibration. The optimal temperature in the main chamber should be from +2 to +5 degrees Celsius, whereas in the freezer compartment it should fall below -18 degrees. Understanding how your specific appliance reacts to changes in settings will help avoid food spoilage and excessive energy consumption.
Before proceeding with mechanical actions, you need to understand what type of control you have matter. Older models use mechanical thermostat, the operating principle of which is based on the expansion and compression of a sensitive liquid or gas inside a capillary tube. Newer modifications can be equipped electronic control unit, where the settings are set digitally. An error in identifying the type of regulator can lead to incorrect actions and even breakdown of the control unit.
The principle of operation of the thermostat in Polus refrigerators
The main element responsible for maintaining cold is is thermostat (or thermostat). In classic models of the brand Pole this device is a mechanical switch connected to a long sensitive tube. This tube is attached to the evaporator or inserted into the chamber, and it is this tube that transmits data about the current temperature to the actuator. When the temperature inside the chamber rises above the set threshold, the contacts close, triggering the thermostat compressor.
It is important to understand that the adjustment knob does not set a specific temperature in degrees directly, like a thermostat in an oven. It only sets the trigger point at which the compressor will turn on or off. The numbers on the scale (usually from 1 to 5 or from 1 to 7) indicate the cooling intensity. The higher the number, the lower the temperature inside the chamber will be, and the longer the motor-compressor will work.
⚠️ Attention: Never try to forcibly turn the thermostat knob beyond the limit marks. The mechanism has physical stops, and excessive force will break the plastic rod or the switch itself, which will require replacement of the unit.
In models with a system No Frost or with electronic control, the process looks different. Here, temperature sensors (thermistors) transmit an electrical signal to the control board. The board, in turn, analyzes the data and makes a decision to turn on the compressor or start the defrost system. In such cases, “setting the temperature” occurs through a digital interface, and there may be no mechanical knob at all.
How does a thermostat capillary tube work?
Inside the sealed tube there is a gas or liquid (freon), which changes its volume when the temperature changes. When cooling, the volume decreases, the membrane opens the contacts, and the compressor turns off. When heated, the volume increases, the membrane presses on the mechanism, closing the circuit.
Where is the temperature regulator located
The location of the regulator directly depends on the year of manufacture and the specific series of the Polyus refrigerator. In the vast majority of classic two-chamber models, the thermostat knob is located inside the refrigerator compartment. Usually it is located on the right or left wall, closer to the top, often hidden under a plastic casing or located next to the lampshade.
In some modifications, especially in older Soviet models or their modern replicas, the regulator can be placed outside, on the top panel of the case above the refrigerator door. This is done for convenience so as not to open the door every time an adjustment is needed. If you do not see the handle inside, carefully inspect the top of the unit.
For models with electronically controlled the display and settings panel is located on the outside of the door. This can be a display with touch buttons or mechanical keys. In such cases, there is no physical handle inside the chamber, and all settings are made through the interface on the facade.
- 📍 Inside the chamber: On the side wall, often combined with a light bulb or located under the visor.
- 📍 On the outside on top: On the top cover of the refrigerator, typical for models of the KSh series and some modifications of KShD.
- 📍 On the facade: Digital display or button panel on the outside of the door (for models with electronics).
If you find a handle inside the chamber, pay attention pay attention to its markings. It can be indicated by numbers, letters (Min/Max) or colored dots. Understanding this symbolism is the first step to correct setting.
Instructions for setting up a mechanical thermostat
The process of setting the temperature in a refrigerator Pole with mechanical control requires consistency and patience. Changes do not occur instantly: the inertia of the system is large, and stabilization of the temperature after turning the knob can take from 2 to 5 hours. Therefore, you should not turn the knob every 15 minutes in the hope of getting the result faster.
First, determine the current position of the knob. If it is set to "1" or "Min", the refrigerator operates in economy mode, maintaining a temperature of about +7..+9°C. This may not be sufficient for perishable foods. If the knob is at "5" or "Max", the compressor works almost without interruption, trying to achieve the lowest possible temperatures, which leads to freezing of products at the back wall and excessive consumption of electricity.
The optimal starting value for most situations is position "3" or the middle of the scale. After installing the knob in this position, you need to wait a day for the system to return to mode, and only then adjust the settings if the temperature does not suit you.
☑️ Algorithm for setting a mechanical thermostat
An empty refrigerator requires fewer settings (closer to 2-3), since a small volume of products is quickly cooled. A unit completely full of food, especially in hot weather, may require switching to 4 or even 5 to compensate for heat gain.
⚠️ Attention: If you set the maximum value (5 or 6), and the food in the refrigerator still does not freeze or the temperature is above +8°C, this does not mean that you need to look for an even more powerful mode. Most likely, there is not enough refrigerant in the system, the thermostat is faulty, or the door seal is broken. A further increase in load will lead to combustion of the compressor.
Setting up electronic control systems
Modern models of refrigerators Pole and their analogues are often equipped with electronic control modules. Here the setup process looks more technologically advanced, but requires careful study of the instructions, since the interface logic may differ from one manufacturer to another. Typically there is a "Mode" button on the panel or separate "+" and "-" buttons for each camera.
To change the temperature, most often you need to press and hold the setting button for 3-5 seconds until the indicators begin to flash. This puts the system into programming mode. After this, with short presses you select the desired value. Digital control allows you to set the temperature with an accuracy of 1 degree, which cannot be done mechanically.
Some models have (preset) modes, such as “Super Freeze” or “Vacation”. The Super Freeze mode forces the compressor to run continuously, ignoring the thermostat readings, which is useful for quickly freezing fresh food. However, it is absolutely impossible to keep this mode turned on all the time - this will lead to icing and breakdown.
| Operating mode | Temperature (HC) | Temperature (MK) | Description |
|---|---|---|---|
| Economy / Eco | +5..+7°C | -15°C | Minimum power consumption |
| Standard | +3..+5°C | -18°C | Recommended mode |
| Max. cooling | +2°C | -24°C | For quick freezing |
| Holiday | +10..+15°C | Off | Preserving freshness at min. consumption |
When setting up electronic systems, it is important to consider that some models have a child lock function. If pressing the buttons does not produce results and a characteristic sound signal is heard, the lock may be activated. Usually it is removed by a long (3-5 seconds) press of a button with a picture of a lock or a combination of buttons.
Optimal temperature conditions for different products
The correct temperature setting is a compromise between the needs of different groups of products. There is no universal value for the entire chamber, so it is important to know the cold zones inside your Polyus unit. In static refrigerators (without a No Frost ventilation system), the temperature is distributed unevenly: it is colder at the back wall, warmer at the door.
Meat, fish and dairy products require the strictest adherence to the temperature regime, close to 0..+4°C. If you store a lot of these products, it makes sense to move the regulator closer to the maximum values, but make sure that the vegetables against the wall do not freeze. Fruits and vegetables, on the contrary, feel better at +6..+8°C, otherwise they lose moisture and spoil.
Freezing also requires control. For long-term storage (up to 1 year) of meat and poultry, a temperature of no higher than -18°C is required. If you plan to store food longer or want to preserve maximum vitamins, you can set the mode to -24°C, but this will significantly increase energy consumption.
- 🥩 Meat and fish: require stable +0..+4°C in the refrigerator.
- 🥛 Dairy products: optimally +2..+5°C, on the shelf higher than vegetables.
- 🥦 Vegetables and fruits: prefer +6..+8°C, preferably in special boxes.
- 🧊 Freezing: standard -18°C, quick freezing to -24°C.
Using a household thermometer placed on the middle shelf in a glass of water will help you accurately calibrate thermostat. This is especially true for older models, where the scale may be knocked down or not correspond to reality.
Diagnosis of problems: when adjustment does not help
There are situations when you turn the knob, change the electronics settings, but the temperature in the refrigerator Pole does not change or changes inadequately. This is a signal of a malfunction. The most common cause is failure of the thermostat itself. If its contacts are “stuck” in a closed state, the compressor will hum continuously, freezing the entire contents into ice.
The opposite situation: the compressor is silent or turns on extremely rarely, and the chamber is warm, even if the knob is turned to the maximum. This may indicate a freon leak or a broken start relay. In this case, no amount of temperature adjustment will help - it is required repair with the involvement of a technician and refilling the refrigerant.
It is also worth checking the condition of the rubber seal on the door. If it is dry, torn or simply dirty, warm air constantly enters the chamber. The compressor tries to compensate for heat loss, working for wear, but cannot reach the set temperature. A visual inspection and a simple check with a sheet of paper (it should be pulled out with force from the closed door) will help identify the problem.
⚠️ Attention: If you notice that a “fur coat” (a thick layer of ice) has formed on the back wall of the refrigerator compartment, and the compressor is running non-stop, under no circumstances continue to operate in this mode. This is a sign of a faulty defrost system or thermostat. Defrost the refrigerator completely (for at least 24 hours with the doors open) before turning it on again.
In rare cases, the problem may lie in a clogged capillary tube or a malfunction of the fan (in No Frost models). If the fan does not drive cold air, the sensor in one corner of the chamber may “think” that there is enough cold and turn off the compressor while food in the other corner begins to deteriorate.
Why does the Polyus refrigerator get very cold even at minimum?
If even at position "1" or "Min" the food freezes, most likely the thermostat is faulty (its contacts do not open) or the rod adjustment is broken. This is also possible if there is a severe lack of freon in the system (paradoxically, the sensor may incorrectly read the temperature at the attachment point).
Is it possible to use a Polyus refrigerator without a thermostat?
Theoretically, you can close the contacts so that the compressor works constantly, but this will lead to rapid failure of the equipment and spoilage of food. Operation without a working thermostat is allowed only in emergency mode for a very short time under constant supervision.
How often do you need to defrost the refrigerator to reset the settings?
Regular defrosting (once every 6-12 months for a drip system and once a year for No Frost) helps maintain the efficiency of heat transfer. However, defrosting itself does not “reset” the thermostat settings, since they are mechanical or stored in the board’s memory.
Does the temperature in the room affect the operation of the refrigerator?
Yes, directly. If the room is hot (+30°C and above), it is more difficult for the Polyus refrigerator to transfer heat through the condenser (grid at the back). It has to work longer to reach the same internal temperature. In such conditions, it may be necessary to set the regulator to a higher value.
What to do if the thermostat knob is broken?
If the plastic tip is broken, you can temporarily replace it with a suitable part or carefully tighten the rod with pliers (with caution). If the mechanism itself breaks down inside, the thermostat needs to be replaced with one with similar parameters (the markings are usually applied to the body).