What is hidden inside the refrigerator: a complete guide to the design and principles of operation

Refrigerator - one of the most important household appliances in the house, but few people think about how it works inside. We are used to simply opening the door, putting food in and closing it, without delving into the processes that provide cold. Meanwhile, knowledge of the internal structure of the refrigerator helps not only to operate it correctly, but also to notice signs of malfunctions in time, save energy and even extend the life of the equipment.

In this article we will analyze in detail what components are hidden behind the body of the refrigerator, how they interact with each other and why some parts fail over time. You will learn how the systems differ No Frost and drip defrostinghow they work inverter compressor and why ice sometimes forms in the freezer, despite modern technologies. The information will be useful for both ordinary users and those who are planning independent repairs or simply want to better understand their equipment.

Main components of a refrigerator: what is hidden under the body

Any refrigerator, regardless of model and brand (Samsung, LG, Indesit, Atlant or Beko), consists of several key nodes. They can be divided into three groups:

• 🔧 Refrigeration circuit — a system directly responsible for cooling (compressor, condenser, evaporator, capillary tube).
• ⚙️ Control elements —thermostat, electronic unit, temperature sensors.
• 📦 Auxiliary parts —fans, drainage system, door seals, lighting.

Even if you have never disassembled the refrigerator, you have probably heard the buzzing compressor —the main “heart” of the system. This is an electric motor that compresses the refrigerant (usually freon R134a or R600a) and forces it to circulate through the tubes. Without a compressor, the refrigerator turns into an ordinary cabinet.

Another important element is condenser (the same grille at the back or bottom of the refrigerator). It removes heat that is taken from the chamber. If the condenser is dusty, the refrigerator begins to overheat and wear out. But evaporator (usually hidden behind a plastic panel inside the chamber) performs the opposite task - absorbs heat from the air, cooling the food.

How the refrigeration circuit works: from the compressor to the refrigerant

The principle of operation of the refrigerator is based on Carnot cycle a physical process in which the refrigerant sequentially changes its state (liquid → gas → liquid), transferring heat from the chamber to the outside. Let's consider this process step by step:

1. Refrigerant compression. The compressor sucks freon gas from the evaporator and compresses it, increasing the pressure and temperature.
2. Condensation. The hot gas enters the condenser, where it is cooled by air and turns into liquid, releasing heat to the environment.
3. Throttling. Liquid freon passes through capillary tube (or a thermostatic valve in modern models), where its pressure drops sharply.
4. Evaporation. The refrigerant enters the evaporator, boils, absorbing heat from the chamber, and turns back into gas, after which the cycle repeats.

It is interesting that in inverter refrigerators (for example, LG Inverter Linear Compressor) the compressor does not operate in the "on/off" mode, but smoothly regulates power, which reduces the load on the network and reduces wear on parts. Such models consume 20–30% less electricity than conventional ones.

Defrost systems: No Frost vs drip

One of the key differences between modern refrigerators is the type of defrosting system. It determines how often you will have to manually remove the ice and how evenly the cold will be distributed inside the chamber.

• ❄️ Drip system (it is also called “crying”) The evaporator is located on the back wall of the refrigeration chamber. When the compressor is running, frost forms on it, which melts and flows into the drain when turned off. hole. Such refrigerators (Atlant, Biryusa) are cheaper, but require manual defrosting of the freezer 1-2 times a year.
• 🌬️ No Frost ("without frost"). Fans are installed in the freezer and refrigerator compartments, which evenly distribute cold air. The evaporator is hidden behind the panel, frost. it thaws automatically thanks to the heating element. Examples: Samsung RB30A3000SA, LG GA-B409SLGL.

Important: No Frost refrigerators do not mean “no defrosting at all” - they also need to be washed periodically and the drainage hole checked to avoid clogging and unpleasant odors.

Each system has its own pros and cons. For example, No Frost faster. restores the temperature after opening the door, but consumes a little more electricity due to the operation of the fans. ice? drip models are quieter and easier to repair, but ice can form in them if the door is not closed tightly.

Why does ice still appear in the No Frost refrigerator?

If ice forms in the No Frost freezer, this may indicate:

1) Malfunction of the defrosting heating element (heating element).

2) Breakage of the defrost sensor or timer.

3) Clogged drainage hole, due to which water does not drain and freezes.

4) Frequent opening of the door or its loose closing (check the seal!).

Thermostat and electronic control: how the refrigerator “understands” when to turn on

Responsible for maintaining the set temperature in the refrigerator thermostat (in mechanical models) or electronic control unit (in modern ones). In the first case, it is a simple bimetallic sensor that opens the circuit when the desired temperature is reached. In the second there is a complex board with a microprocessor, sensors and a display.

In refrigerators with electronic control (for example, Samsung RL38T6000SA), the temperature can be set with an accuracy of 1°C, and also use additional functions:

• 📊 Vacation mode —maintains the minimum temperature during long absence.
• ❄️ Super freezing —quickly cools large volumes of food.
• 🍷 Freshness zone - a separate compartment with a temperature of about 0°C for meat, fish, herbs.

If the refrigerator stops turning off or, conversely, does not turn on at all, the problem may lie in the thermostat. It’s easy to check: turn the knob to maximum cooling - if the compressor does not start, the sensor is faulty. In electronic models, diagnostics are more complicated and require special equipment.

The compressor works without stopping|The temperature in the chamber is too high or low|The refrigerator does not respond to changes in settings|An error flashes on the display (for example, E1 or F2)-->

Drainage system: why water accumulates in the refrigerator

Many have encountered a problem: water accumulates under the vegetable drawers or at the bottom of the refrigerator compartment. This is a sign of a malfunction. It consists of: drainage system. It consists of:

• 💧 Drainage hole - a small hole on the back wall where condensation drains.
• 🔗 Tubes - connects the hole to a container for collecting water (usually above the compressor).
• 🚰 Containers for condensation - evaporates water thanks to the heat from the compressor.

If the water does not drain, most likely the hole or tube is clogged. You can clean them using:

1. A plastic tube or knitting needle (careful so as not to damage the plastic!).
2. Syrings with warm water (pour under pressure into the hole).
3. A special brush (sold in household goods stores).

In refrigerators No Frost the drainage system is more complex, since condensation forms not only in the refrigerator, but also in the freezer. If water appears under the freezer, this may indicate freezing of the drainage tube due to a malfunction of the system. defrost.

Door seal: why the refrigerator does not keep cold

Rubber seal (or magnetic rubber band) ensures the tightness of the chamber. If it is worn out or dirty, warm air gets inside, causing the compressor to wear out. Signs of a problem:

• 🔍 A gap is visible on the door or the rubber band is coming off. case.
• ❄️ Ice forms on the back wall (in models with a drip system).
• 💨 The refrigerator hums longer than usual.

It’s easy to check the tightness: close the door, bring a sheet of paper to the seal and try to pull it out. slipped out without effort - the rubber band is faulty. You can restore it using:

• 🧼 Cleaning (soap solution or glass cleaner).
• 🔥 Heating hairdryer (if the rubber band is deformed from the cold).
• 🛠️ Replacements (you can buy a new seal based on the model of the refrigerator).

In modern models (Liebherr, Bosch) seals often have a magnetic insert, which provides a tighter fit. However, even they lose elasticity over time, especially if the refrigerator is standing. near a stove or window.

Fans and air circulation system

In refrigerators No Frost and some models with freshness zones fans are installed that ensure uniform distribution of cold. They can be located:

• 🌬️ In the freezer compartment (main fan).
• 🍃 In the fridge compartment (additional, for circulation).
• 🔄 In the system Multi Air Flow (several fans for independent cooling of zones).

If the fan fails, the refrigerator begins to cool poorly, and in the freezer the formation of ice. Causes of breakdowns:

• 🕷️ Dust or cobwebs getting on the blades.
• ❄️ Fan icing (if the defrost system does not work).
• ⚡ Power supply problems (wire break or malfunction) board).

You can check the fan by listening to the operation of the refrigerator. Normally, you should hear a slight air noise. If it is not there, but the compressor is working, the fan is most likely jammed. In some models (Samsung, LG), to access it you need to remove the back panel of the freezer.

How to check the fan without disassembly?

1. Unplug the refrigerator.

2. Open the freezer door.

3. Manually rotate the fan blades (they should rotate easily, without squeaking).

4. If they don’t spin, it means the fan is jammed with ice or a foreign object.

⚠️ Attention: If you notice that the refrigerator has become worse in cooling, but the compressor is running non-stop, do not rush to change the freon or compressor. In 30% of cases, the problem lies in a clogged fan or a faulty temperature sensor.

FAQ: Frequently asked questions about the internal structure of the refrigerator

Why does the refrigerator hum, but does not freeze?

This is a typical sign of one of three problems:

1. Freon leak — if the circuit tubes are damaged, the refrigerant comes out and the compressor runs idle.
2. Compressor jammed —it hums, but does not create pressure (needs replacement).
3. Clogged capillary tube —freon does not circulate, and it’s cold does not enter the chamber.

You can only remove the blockage yourself (by blowing out the tube). In other cases, you need a specialist.

Is it possible to fill the refrigerator with freon yourself?

Theoretically, yes, but in practice, this requires special equipment (vacuum pump, pressure gauges, a cylinder with freon) and skills. Errors during refueling can lead to:

• Air getting into the system (the compressor will burn out).
• An excess or lack of freon (the refrigerator will not work correctly).
• Damage to the ozone layer (if you use old types of freon, for example, R12).

It is better to contact a service center.

What is the "fresh zone" and how does it work?

This is a separate compartment with a temperature of about 0°C and high humidity, optimal for storage:

• 🥩 Raw meat and fish (up to 3 days without freezing).
• 🥬 Greens, berries, vegetables (keep vitamins longer).
• 🧀 Soft cheeses and sausages.

Some models (Liebherr BioFresh) use an additional fan and a carbon filter to absorb ethylene (a gas that accelerates food spoilage).

Why does condensation form on the back wall of the refrigerator?

This is normal for models with drip system - moisture from air condenses on the cold evaporator. But if there is too much condensate or it does not evaporate, check:

• The tightness of the door (the seal may be worn out).
• The room temperature (if above 30°C, the refrigerator may not cope).
• The operation of the drainage hole (if it is clogged, water will accumulate).

How much does it cost to replace a compressor?

The cost depends on the model and type of compressor:

• Regular compressor: 5 000–12,000 ₽ (with work).
• Inverter compressor: 10,000–20,000 ₽ (due to the complexity of installation).

For models older than 10 years, replacement is often unprofitable - it’s cheaper to buy a new refrigerator.

⚠️ Attention: Prices for spare parts and work may vary greatly depending on the region and service center. Check current prices with local craftsmen.