Two-chamber models of the domestic brand Biryusa have proven themselves to be reliable and durable units, but their management often raises questions among new owners. Unlike modern electronic systems, mechanical adjustment predominates here, which requires an understanding of the principles of operation of the compressor and thermostat. Correctly setting the temperature is not just a matter of comfort, but a necessary condition for preserving food and saving energy.
Many users are faced with a situation where the food in the refrigerator freezes, but the freezer is not cold enough. Often the reason lies in the incorrect position of the thermostat handle or violation of the rules for placing weights. Mechanical thermostat - this is a sensitive device that responds to changes in refrigerant pressure, and its calibration takes a certain time. Immediately after turning on or changing the settings, the unit requires from 2 to 5 hours to stabilize the internal climate.
In this material we will analyze in detail the algorithm of actions for various series of equipment, explain the meaning of the numbers on the scale and help you avoid common mistakes during operation. You will learn why you cannot set the maximum mode unless necessary and how to check the tightness of the circuit if the temperature no longer holds. Proper adjustment will extend the life of the motor and preserve the taste of your supplies.
The principle of operation of a mechanical thermostat
The main control element in most models Biryusa is a mechanical thermostat located inside the refrigerator compartment. It is a device that opens the electrical circuit of the compressor when the set temperature is reached. Turning the handle changes the spring tension, which, in turn, affects the moment the contacts operate. This means that you do not control a specific temperature in degrees, but the duration of operation of the compressor.
The regulator scale is usually designated from “Min” (or 1) to “Max” (or 7). It is important to understand: the higher the number, the lower temperature inside the chambers, since the compressor will work longer, taking longer rest breaks only with strong cooling. In the “Min” position, the unit will turn on rarely, maintaining a relatively warm mode, which can be dangerous for perishable products in hot weather.
Why are there no exact degrees on the handle?
Mechanical thermostats are not designed to display the exact temperature in degrees Celsius on the scale. Values 1-7 are conditional cooling power factors. The exact temperature inside the chamber also depends on the external temperature in the room, how full the shelves are and the tightness of the seals.
It is worth noting that in two-chamber models with one compressor the cold is distributed unevenly. The main cold goes into the freezer, and residual cold or air circulating through the ducts enters the refrigerator compartment. Therefore, the setting is always made according to the temperature in the refrigerator compartment, and the freezer works in conjunction with it. If you turn the knob to the maximum, vegetables may freeze in the refrigerator compartment, and the motor will work almost without stopping.
The location and setting of the thermostat in different models
Depending on the year of manufacture and series, the location of the temperature regulator in refrigerators Biryusa may differ. In classic models, such as series Biryusa 133 or 6, the thermostat is located inside the refrigerator compartment, often in the upper right corner or above the door. The handle can be hidden under a plastic casing or protrude directly into the chamber volume. In more modern versions with a system No Frost or improved air circulation, the control can be placed on an external panel, although the mechanical principle remains the same.
To configure you will not need tools, except, perhaps, flashlight to better see the numbers. The process is as follows: Find the round knob with numbers on it. If there is a stopper on it, you need to carefully remove it or press it to turn the regulator. Do not use excessive force as the plastic mechanism is sensitive to shock. Turning clockwise usually increases the cooling power (reduces the temperature), counterclockwise - decreases it.
Particular attention should be paid to models with two thermostats, which is less common, but possible in some modifications. In such cases, one regulator is responsible for the refrigerator compartment, and the second for the freezer compartment. This gives more flexibility, but requires more delicate balancing. If you do not know the exact model of your unit, look at the technical data sheet or inspect the nameplate inside the chamber, where the factory parameters are indicated.
Optimal temperature conditions for storage
The choice of the correct operating mode directly affects the shelf life of products. For the refrigerator compartment, the optimal temperature range is considered to be from +2 to +5 degrees Celsius. In such conditions, bacteria multiply slowly, and food remains fresh. For the freezer, the standard is -18 degrees and below. With this mode, you can store meat and fish for up to 12 months without loss of quality.
On a mechanical scale Biryusa these parameters usually correspond to the position of the handle in the middle or slightly to the right of the center. For example, if the scale has 7 divisions, then the “3” or “4” position is often the working standard for the summer period. In winter, when the room temperature drops, the load on the compressor can be reduced by moving the knob closer to “Min.”
Below is a table that will help you navigate the approximate correspondence of the regulator positions and temperature conditions (data are averaged and may vary depending on the model and operating conditions):
| Knob position | Operating mode | Approximate t° in the refrigerator compartment | Recommendation for use |
|---|---|---|---|
| Min / 1 | Economy | +7...+9°C | For storing drinks, canned food, in winter |
| 3 / 4 (Average) | Normal | +3...+5°C | Daily use, storage of prepared food, dairy products |
| Max / 6-7 | Intensive | 0...+2°C | Loading a large volume of warm food, hot weather |
| Off | Stop | Ambient temperature | For defrosting or long-term downtime |
Remember that food placement also affects the overall temperature. If the shelves are packed tightly, the cold circulates less well and the compressor has to work harder. Leave gaps between packages for free circulation of air flow, especially in models with a system Dynamic Cooling or analogues.
Seasonal adjustment and external factors
The ambient air temperature in the room has a direct impact on operation refrigeration equipment. In the summer, when the apartment is +25...+30 degrees, heat transfer from the condenser is difficult. Under such conditions, the compressor is forced to work almost continuously to maintain the set mode. If you notice that the unit hardly turns off and it’s too cold inside, it makes sense to reduce the power a little by turning the thermostat knob to the left.
In winter, the situation is the opposite. If the refrigerator is located in an unheated room or in the kitchen, where the temperature drops below +16 degrees, problems may arise with the start of the compressor or the operation of the evaporator. The oil in the compressor thickens and the refrigerant circulates less well. In winter, it is recommended to set the control to a position close to medium, or even closer to the minimum, as the natural cold of the room helps with cooling.
⚠️ Attention: It is not recommended to operate refrigerators Biryusa at ambient temperatures below +10 degrees Celsius, unless otherwise indicated in the instructions for a specific model. This can lead to compressor failure or disruption of oil circulation.
It is also worth considering the location of the refrigerator in space. If it is located close to a wall or in a niche, the rear radiator (condenser) cannot efficiently transfer heat. This leads to overheating of the system and a false feeling that the refrigerator is not working. The user turns the knob to maximum, loading the motor, although the problem is ventilation. Provide a gap of at least 5-10 cm from the rear wall of the unit to the wall of the room.
Diagnostics of problems with temperature conditions
If you set the regulator to the middle position, more than 5 hours have passed, but the temperature does not meet expectations, it is necessary to carry out diagnostics. The first sign of a malfunction may be the nature of the compressor's operation. If it turns on for 1-2 minutes and turns off, or works for days without a break, this is a signal of a system disorder.
A frequent problem in two-chamber Biryusha is a leakage or clogging of the capillary tube. Check the door seals: they should fit snugly around the entire perimeter. A sheet of paper sandwiched between the door and the body must be removed with force. If the paper falls out freely, the seal is worn out or the door is warped, and the cold escapes out.
☑️ Diagnosis of temperature problems
Another important aspect is the amount of ice. If a “fur coat” thicker than 5-7 mm has formed in the freezer, this significantly impairs heat transfer. The evaporator is covered with ice and cannot effectively cool the air. In this case, no adjustment of the thermostat will help until you completely defrost the unit within 10-12 hours.
Frequent errors during operation
One of the most common mistakes is setting the maximum mode immediately after loading a large number of products at room temperature. Users strive to cool supplies faster by turning the knob to “7” or “Max”. This causes the compressor to work at its limit, trying to cool the warm mass, and can burn out from overload. It is more correct to load products in small portions or cool them first.
Frequently changing settings is also considered a mistake. The mechanical thermostat and the system itself need time to stabilize. If you turned the knob in the morning, and in the evening it seemed to you that there was not enough cold, and you added more, you are breaking the cycle. Wait for a complete cooling cycle (usually several hours) before making adjustments.
⚠️ Attention: Never use sharp objects to remove ice from the freezer. A puncture in the evaporator will lead to an immediate release of freon and expensive repairs, which are often not economically feasible.
Do not forget about the cleanliness of the condenser. Dust and pet hair that settle on the black grille at the back of the refrigerator act as a heat insulator. The unit stops giving off heat, efficiency drops, and the temperature inside rises. Regular cleaning of the back with a vacuum cleaner or dry brush is a mandatory procedure to maintain the declared characteristics.
Specifics of models with the No Frost system
In modern two-chamber refrigerators Biryusa with the system No Frost temperature control principle similar, but there are nuances. Here, cold air is forced to circulate through the chambers using a fan. The thermostat (or sensor, if the control is electronic, but in mechanics it is still a thermostat) reads the temperature of the air returning to the evaporator.
In such models, it is important not to block the air duct openings with products. If you place the pan directly in front of the cold air coming out, the sensor will quickly read the low temperature and turn off the compressor, although it may be warm in the depths of the chamber. Distribute the products so that air flows freely wash the entire volume.
Sometimes in models with one compressor and No Frost, a situation is observed when the freezer is “Arctic”, and the refrigerator compartment warm. This may indicate a malfunction of the damper that regulates the air flow, or that the thermostat is not secured correctly (for example, the sensing element tube has come loose). In such cases, adjusting the handle yourself will not help - you need to call a technician to check the automation.
When professional repairs are required
There are situations when adjusting the temperature is impossible by the user. If the compressor hums but does not start, or starts and immediately clicks and stalls, the problem is in the start relay or the motor itself. If the unit operates silently, but there is no cold anywhere, and the condenser at the back is cold, there is probably a freon leak.
It is also worth contacting service if you notice that the thermostat is “stuck.” For example, you turn the knob, but there is no click to turn off the compressor even when the chamber is clearly overcooled, or vice versa, the refrigerator does not turn on even at maximum. Replacing a thermostat is a simple procedure for a technician, but requires disassembling the case and the availability of tools.
⚠️ Attention: Independent replacement of a thermostat or sensors is possible only if you have skills in working with electrical equipment and an understanding of the structure of the refrigerator. Incorrect installation of the thermostat sensitive tube will lead to incorrect operation of the entire system.
Regular maintenance and correct temperature setting in the refrigerator Biryusa is the key to its long service. Understanding simple mechanics and thermodynamics will help you avoid breakdowns and keep food fresh. Remember that this technique was created with a margin of safety, but requires careful attention to operating conditions.
Is it possible to use an external thermometer?
Yes, it is even useful. Place a regular alcohol thermometer in a glass of water on the middle shelf of the refrigerator. After 5-6 hours, check the readings. This will give you an accurate understanding of the real temperature, since built-in mechanical regulators often have a large error.
FAQ: Frequently asked questions
Why does ice freeze in the Biryusa refrigerator, even if I did not open the door?
This may occur due to a loose door, worn seal or malfunction of the defrost system (heating element or timer). Ice also builds up if you put hot food or a poorly closed wet container in the chamber. Check the tightness of the door and, if necessary, defrost the unit completely.
What number should you set on the thermostat in the summer?
In the summer, when the room temperature is high, the load on the refrigerator increases. It is usually recommended to set the regulator to the middle position (3 or 4 out of 7) so that the compressor does not work for wear. If the room is very hot, you can add power, but make sure that the food in the refrigerator compartment does not freeze.
What to do if the compressor does not turn off?
If the refrigerator operates without stopping for more than 12 hours, this is emergency mode. Check to see if the door is open, if the condenser is clogged with dust, and if the thermostat is set correctly. If, when turning the knob to the “Min” or “Off” position, the compressor continues to hum, the thermostat contacts are probably stuck and it needs to be replaced.
Is it possible to transport the Biryusa refrigerator lying down?
Transportation lying down is not recommended, but is possible over short distances. After transportation in a horizontal position, it is necessary to allow the unit to stand vertically for at least 4-6 hours (preferably a day) before turning it on. This is necessary so that the oil flows into the compressor and does not enter the refrigerant circuit.