Double-chamber refrigerators Biryusa have remained one of the most popular in Russia for decades due to the combination of reliability, simplicity of design and adaptability to domestic operating conditions. Unlike modern models with inverter compressors and systems No Frost, classic units of this brand operate according to a time-tested scheme, which simplifies their repair and maintenance. However, many users do not fully understand how exactly cooling is organized in two separate chambers, why the freezer sometimes turns off while the refrigerator compartment continues to work, and what nuances affect energy consumption.
In this article we will examine the principle of operation of a two-chamber refrigerator Biryusa at the circuit level: from refrigerant circulation to the interaction of the thermostat and compressor. You will learn how the cold is distributed between the chambers, why it is important to set the temperature correctly, and what “symptoms” indicate malfunctions. We will pay special attention to models with drip defrosting system and manual adjustment - the most common in the brand’s line.
The material will be useful for beginners who have just become acquainted with the technology. Biryusa, as well as experienced owners who want to optimize the operation of the device. We will explain all technical terms in simple language, and highlight the critical points separately.
Design of a two-chamber refrigerator Biryusa: main components and their functions
Structurally refrigerators Biryusa with two chambers are a sealed system where cold is produced in one place (compressor-condensing unit) and then distributed between the freezing and refrigerating compartments. Key elements:
- 🔧 Compressor —the “heart” of the refrigerator, which compresses the refrigerant (usually isobutane R600a) and ensures its circulation throughout the system. In most models Biryusa is used piston compressor with a start relay.
- ❄️ Evaporator — a tubular radiator located in the freezer compartment (less commonly, combined for both chambers). Here the refrigerant expands, taking heat from the chamber.
- 🔄 Condenser - a grill on the back wall of the refrigerator where the hot refrigerant gives off heat to the environment and condenses.
- 📉 Thermostat (or thermoregulator) - a mechanical device that turns the compressor on/off depending on the temperature in the refrigeration chamber.
- 🚪 Door seals i damper - ensure tightness and distribution of cold air between chambers.
Feature of two-chamber models Biryusa — separate temperature control: the freezer usually has its own regulator (or fixed mode), and the refrigerator has a separate thermostat with a setting knob (from 1 to 7). This allows you to flexibly configure storage conditions, but requires an understanding of how changes in one chamber affect the other.
In budget models (for example, Biryusa 10 or Biryusa 22) often used single-circuit system cooling: Biryusa 140 data-i="103">or: the cold first enters the freezer, and then through the damper into the fridge compartment. In more expensive options (for example, Biryusa 140) it can be used double-circuit circuit with separate evaporators for each chamber.
⚠️ Attention: If your model Biryusa manufactured before 2010, it may have used refrigerant R12 or R134awhich are prohibited today. If freon leaks, contact only certified service centers - self-refueling is dangerous!
Principle of operation: how the cold is distributed between the chambers
The cooling process in a two-chamber refrigerator Biryusa is cyclical and consists of four main stages:
- Refrigerant compression: The compressor sucks gaseous freon from the evaporator, compresses it to high pressure (5–10 atm) and sends it to the condenser. In this case, the refrigerant temperature rises to 50–70°C.
- Condensation: In the condenser (grid on the back wall), hot freon cools, giving off heat to the room, and turns into a liquid state.
- Expansion: Liquid refrigerant passes through capillary tube (thin channel), where its pressure drops sharply and the temperature drops to −10...−20°C.
- Evaporation: In the evaporator (in the freezer), freon boils, absorbing heat from the chamber. The steam enters the compressor again, and the cycle repeats.
Key nuance: in refrigerators Biryusa s one compressor the cold first enters the freezer. Only when the set temperature is reached there (usually −18°C), part of the cold air is directed through damper to the refrigeration compartment. This explains why:
- 🌡️ When first turned on, the freezer cools faster than the refrigerator compartment.
- ❄️ If the damper freezes or breaks, the refrigerator compartment stops cooling.
- ⚡ When the freezer door is open, the temperature in the refrigerator compartment may rise.
In models with two compressors (for example, Biryusa 149) the chambers operate independently: each compressor serves its own zone. This is convenient for fine tuning, but increases energy consumption and the cost of repairs.
The role of the thermostat and damper: why the refrigerator turns on and off
The thermostat (or thermostat) is the “brain” refrigerator Biryusawhich controls the temperature in the refrigerator compartment. Classic models use mechanical thermostat (for example, K-59 or TAM-133), which works on the principle of a bimetallic plate:
- 🔘 When the temperature in the chamber rises above the set temperature, the thermostat contacts close and the compressor turns on.
- ❄️ When the desired temperature is reached, the contacts open and the compressor turns off.
- 🔄 The cycle is repeated every 10-30 minutes (depending on external conditions).
The damper between the chambers performs two functions:
- Regulates the flow of cold air from the freezer to the refrigerator compartment.
- Prevents the mixing of moist air (from the refrigerator) with dry air (from the freezer), which reduces the formation of ice.
If the damper freezes or sticks, the refrigerator compartment stops cooling, and the freezer begins to work in increased mode, which leads to increased energy consumption.
In models with electronic control (for example, Biryusa 151) instead of a mechanical thermostat used temperature sensor and a control board. This allows you to more accurately maintain the mode, but complicates the diagnosis of malfunctions.
⚠️ Attention: If the refrigerator Biryusa turns on too often (every 5-10 minutes) or, conversely, works without stopping for more than an hour, this may indicate:
- thermostat malfunction,
- refrigerant leak,
- condenser contamination.
First check the door seals and room temperature (optimally 16–30°C).
Operating modes and their impact on energy consumption
Refrigerators Biryusa usually have 3–5 operating modes, which are regulated by a rotary thermostat knob. In instructions, they are often indicated by numbers (1–7) or inscriptions (“Minimum”, “Normal”, “Maximum”). Here's how they affect the operation:
| Mode | Temperature in the refrigerator compartment | Temperature in the freezer compartment | Energy consumption | Recommendations for use |
|---|---|---|---|---|
| 1 (Minimum) | +8…+10°C | −12…−14°C | Low | For short-term storage (for example, during the summer season) or at low load. |
| 3–4 (Normal) | +4…+6°C | −18…−20°C | Average | Optimal mode for most products. Recommended for continuous use. |
| 5–7 (Maximum) | +2…+4°C | −24…−28°C | High | For quick freezing or in conditions of high room temperature (above 30°C). |
It is important to understand that The “Maximum” mode increases energy consumption by 20–30% compared to “Norm”. For example, a refrigerator Biryusa 130 in mode 4 consumes about 1 kWh/day, and in mode 7 - up to 1.4 kWh/day. In this case, the difference in the temperature of the refrigerator compartment will be only 2–3°C.
Additional factors affecting energy efficiency:
- 🔌 Frequency of door openings: each opening increases the temperature by 1–2°C, and the compressor takes 5–10 minutes to restore mode.
- 🌡️ Room temperature: at +30°C in the room, the refrigerator consumes 15–20% more electricity.
- 🧊 Thickness of ice in the freezer: a layer of ice of more than 5 mm increases energy consumption by 10–15%.
Typical faults and their causes
Despite their reliability, refrigerators Biryusa may fail over time. Let's look at the most common problems and their possible causes:
- ❌ The refrigerator does not turn on:
- 🔌 Malfunction of the compressor or start relay.
- 🔧 Open circuit thermostat.
- ⚡ Problems with the power supply (check the socket and power cord).
- ❄️ The freezer is working, but the refrigerator is not:
- 🔄 The damper between the chambers is frozen or broken.
- 🌡️ The refrigerator thermostat is faulty.
- 🧊 The capillary tube is clogged (flushing the system is required).
- 🔊 Constant noise or vibration:
- 🔧 Loose fastenings compressor.
- 🐭 Debris or dust has gotten into the condenser.
- ⚡ Incorrect installation (the refrigerator is not level).
- 💧 Water accumulates in the refrigeration chamber:
- 🚰 The drainage is clogged hole.
- 🔄 The defrost system does not work (in models with drip defrosting).
- 🧊 The door seal is broken (check the seal).
Most faults can be diagnosed independently, but repair of refrigerant-related systems (compressor, capacitor, capillary tube), it is better to entrust it to professionals. For example, filling freon in the refrigerator Biryusa requires evacuation of the system and accurate dosing of the refrigerant - an error can lead to a repeated leak or failure of the compressor.
⚠️ Attention: If the refrigerator Biryusa after defrosting does not turn on, do not try to “warm up” the compressor with a hairdryer or other heaters! This may damage the winding. Wait 1-2 hours - during this time the pressure in the system will equalize and the compressor will start on its own.
☑️ Diagnosis of malfunctions of the Biryusa refrigerator
How to properly operate the refrigerator Biryusa for long-term operation
The service life of the refrigerator Biryusa with proper operation is 10–15 years. To avoid premature breakdowns, follow these recommendations:
- Installation:
- 📏 The refrigerator must stand level (adjust the legs according to the level).
- 🔌 The socket must be grounded and withstand load of at least 10 A.
- 🚫 Do not place the refrigerator next to the stove, radiator or in direct sunlight.
- Defrosting:
- ❄️ Defrost the freezer at least once every 6 months (if the ice thickness is more than 5 mm).
- 💧 It is enough to wipe the refrigerator compartment with a drip system once every 2-3 months.
- 🔧 Do not use sharp objects to remove ice - this can damage the evaporator.
- 🧽 Wash the internal surfaces with a warm solution soda (1 tbsp per 1 liter of water).
- 🧴 To remove odors, use activated carbon or special absorbers.
- 🔄 Once a year, clean the condenser from dust (with a vacuum cleaner or brush).
- Do not turn on the refrigerator immediately - let it stand upright for 4-6 hours.
- If after this the compressor does not start, carefully tilt the refrigerator back 30-40° and hold it for 5-10 minutes, then return to the original position.
- Try to turn on again. If the problem persists, contact service.
Pay special attention door seals: over time, they lose their elasticity and begin to let warm air through. Check their tightness using a sheet of paper: if it pulls out easily when the door is closed, the seal needs to be replaced. For models Biryusa standard seals with a width of 12–14 mm are suitable (for example, UGP-14).
If the refrigerator has not been used for a long time (for example, at the dacha in winter), before turning it on, let it stand for 2-3 hours in a warm room. This is necessary to equalize the oil pressure in the compressor prevent water hammer.
What to do if the Biryusa refrigerator does not turn on after transportation?
After transporting the refrigerator (especially in a horizontal position), oil from the compressor may enter the cooling circuit. In this case: