Big box in the refrigerator: what is it for and how to use

If you have ever looked at the instructions for a modern refrigerator or studied its internal structure, you have probably come across the term “big box.” data-i="47">). This element is found in almost all models with the system big box). This element is found in almost all models with the system No Frost, but not all users understand its purpose. Meanwhile, the correct use of a big box directly affects the cooling efficiency, energy consumption and even the service life of equipment.

In this article we will look at what a big box is, how it works and why it cannot be ignored. You will learn which products are best stored in this area, how to avoid common mistakes and what to do if the big box starts to work incorrectly. We will also reveal a few secrets that manufacturers rarely mention in official manuals.

What is a big box and where is it located

A big box (sometimes called evaporation unit or cooling chamber) is a key element of the system No Frost, responsible for the circulation of cold air. Externally, it looks like a plastic box with perforations located on the back wall of the refrigerator or freezer. In some models (for example Samsung RB37J5240 or LG GA-B489YDQZ) the big box is hidden behind a decorative panel, in others it is open and visible immediately when the door is opened.

Main The function of this node is even distribution of cold across the entire volume of the chamber. Inside the big box there is an evaporator (radiator) through which the refrigerant circulates. A fan built into the system takes warm air from the chamber, passes it through the evaporator, where it is cooled, and returns it back through the holes in the housing. This maintains a stable temperature without the formation of frost on the walls.

🔍 How to find a big box in your refrigerator?

• 📍 Refrigerator camera: usually located in the upper part of the back wall, under a shelf or behind a plastic panel.
• ❄️ Freezer: can occupy the entire back wall or be integrated into the system Total No Frost (as in models Bosch KGE39XW2AR).
• 🔧 Modern models: sometimes a big box is combined with the system Multi Air Flow (for example, in Samsung RS6HA8891B1), where air flows are regulated separately for each zone.

If you are not sure whether your refrigerator has a big box, check the presence of a ventilation hole on the back wall or look in the instructions for the defrosting system in models with a drip system (Direct Cool) of this element. no.

Why do you need a big box: 5 key functions

Many people mistakenly think that a big box is just a “beauty box” or an additional filter. In fact, it performs several critical tasks:

1. Prevention of frost formation. Due to constant air circulation, moisture does not have time to condense on the walls, which means that ice does not form. This eliminates the need for manual defrosting every 1-2 months.
2. Maintaining a uniform temperature. In refrigerators without a big box (with a drip system) there is a temperature difference between the top and bottom shelves can reach 5–7°C. Here the difference is minimal - no more 1–2°C.
3. Accelerated cooling mode products. Streams of cold air blow food from all sides, which is especially important for quick freezing (for example, in the Super Freeze).
4. Protection against compressor overload. The big box reduces the load on the engine, since the cold is distributed more efficiently. This extends the service life of the equipment by 20–30% compared to models without forced-air systems.
5. Air filtration. In some models (for example, Liebherr CNef 4315) the big box is equipped with a carbon or antibacterial filter that eliminates unpleasant odors.

💡 Interesting fact: In premium class refrigerators (for example Miele KFN 29092 D) the big box can work in two modes - standard and intensive. In the second case, the fan rotates faster, which speeds up cooling after loading a large amount of food.

What products can and cannot be stored next to the big box

Since the big box actively “blows” cold air, the area around it has the lowest temperature in the refrigerator compartment. This imposes restrictions on what can be stored there. Incorrect placement of products can lead to their overfreezing or, conversely, insufficient temperature. cooling.

⚠️ Attention: If you store food in an unsealed package in the big box area (for example, chopped vegetables in a container without a lid), they may dry due to the constant flow of air, use cling film or vacuum sealers. packages.

🔹 Tip for the freezer: In freezers with big boxes (for example, Indesit ITF 118 Wit is not recommended to tightly fill the space around the evaporator. Leave a gap 3-5 cm for. free air circulation - this will speed up freezing and reduce energy consumption.

Use airtight containers|Do not cover the vents|Store meat and fish for no longer than 2-3 days|Check the temperature regularly this area|Avoid storing liquids in open containers-->

Frequent problems with big boxes and how to fix them

Despite the reliability of the system No Frost, big boxes can fail or work incorrectly. Here are the most common problems and their causes:

• ❄️ Freezing of the big box. If ice or frost appears on the housing, this may indicate:
  • clogging of the drainage hole (water does not drain, but freezes inside);
  • malfunction of the defrost heater (in models with Full No Frost);
  • damage to the door seal (warm air penetrates inside).
• 🔊 Increased noise. A hum or crackling noise may occur due to:
  • ice getting on the fan blades;
  • wear of fan motor bearings;
  • casing vibration when the refrigerator is installed incorrectly.
• 🌡️ Insufficient cooling. If the products in the big box area are not cooled, check:
  • fan operation (it may be blocked or burned out);
  • refrigerant level (freon leak);
  • temperature settings (mode Holiday or Eco may limit power).

🛠️ What can be done yourself:

1. Unplug the refrigerator and defrost it for 12–24 hours (if the problem is freezing).
2. Check the drainage hole at the bottom of the chamber - clean it with a cotton swab or thin wire.
3. Make sure that nothing is blocking the ventilation grilles (rearrange the products if they are too close).

⚠️ Attention: If after defrosting the ice in the big box appears again within 1–2 weeks, this is a signal of a malfunction of the defrosting system. In this case, replacement is required. defrost timer or heating element —you can’t do without a specialist.

What will happen if you ignore the malfunction of the big box?

If freezing or fan failure is not eliminated, this will lead to:

1. Increased load on the compressor and its overheating (risk of failure in 3-6 months).

2. An increase in energy consumption by 30–50% (noticeable in electricity bills).

3. Uneven cooling - food on the upper shelves can spoil, and on the lower ones it can freeze.

4. Development of mold in the drainage system due to stagnation of water.

How properly care for the big box: cleaning and prevention

The big box, like any other element of the refrigerator, requires care. Neglecting cleaning can lead to an unpleasant odor, reduced cooling efficiency and even breakdowns. Here are step-by-step instructions for care:

1. Shutdown and defrosting.

   Before cleaning, be sure to unplug the refrigerator and wait until it is completely defrosted (at least 6–8 hoursDo not use a hair dryer or other heating devices - this can damage the plastic.

2. Removing the protective panel (if any).

   In some models (for example, Atlant XM 4625-101) the big box is closed with a removable panel. Carefully remove it by pressing the latches or unscrewing the screws (usually they are hidden under the plugs).

3. Cleaning the evaporator and fan.

   Use a soft brush or a vacuum cleaner with a narrow nozzle to remove dust from the radiator. Wipe the fan blades with a damp cloth soaked in a solution of water and vinegar (proportion 1:1).

4. Washing the drainage system.

   Pour warm water and soda into the drainage hole 50–100 ml warm water with soda (1 teaspoon per glass) - this will help dissolve fatty deposits and prevent blockages.

5. Disinfection.

   Wipe all surfaces inside the big box with a solution of water and hydrogen peroxide (3%) or a special product for refrigerators (for example, Topperr 3104).

📅 Recommended cleaning frequency:

• 🧼 Basic cleaning: times in 3 months (combine with general washing of the refrigerator).
• 🔧 Deep cleaning: times 6–12 months (with disassembling the panel and washing the drainage).
• ⚡ Checking the fan: every 2 year (listen for any extraneous sounds during operation).

⚠️ Attention: Never use abrasive products (for example, powders or hard sponges) to clean the big box. They can damage the anti-corrosion coating of the evaporator, which will lead to rust and leakage of freon.

Big box vs. drip system: which is better?

Many users wonder: is a big box really necessary? box, if refrigerators with a drip system (Direct Cool) are cheaper and easier to repair? To answer, let's compare both technologies according to key parameters:

🔹 When to choose a refrigerator with a big box?

• 🏠 If you important uniform temperature (for example, for storing meat or fish).
• ❄️ If you do not want to waste time on manual defrosting.
• 🌡️ If in your region has a hot climate (the system No Frost copes better with the load).

🔹 When is a drip system enough?

• 💰 If the budget is limited (refrigerators with Direct Cool cheaper 15–25%).
• 🏡 If the refrigerator is rarely used (for example, in the country).
• 🔇 If it is important to you silence (no noise from the fan).

📌 Conclusion: A big box is justified in refrigerators for daily use, especially if you store a lot of perishable food. For small families or secondary housing, a drip system can be used. be a more practical choice.

Myths and truth about big boxing

There are many myths around the system No Frost and big boxing. Let's look at the most common ones:

Myth 1: “Big boxes dry out food.”

✅ Truth: Dryness occurs only if the products are stored without packaging or in non-airtight containers. Under normal conditions, the humidity in the chamber is maintained at the level 50–60%, which is optimal for most products.

Myth 2: “Refrigerators with big boxes do not need to be defrosted.”

❌ True: You need to defrost, but less often - once every 6-12 monthsThis is necessary for cleaning the drainage system and removing dust from the evaporator.

Myth 3: “The big box takes up useful space.”

✅ True: Yes, it takes up 5–10% the volume of the chamber, but due to uniform cooling it allows use the remaining space more efficiently (you can load products more densely).

Myth 4: “The fan in a big box breaks down every 2-3 years.”

❌ True: The average lifespan of a fan is 7–10 years. It fails only when incorrect operation (for example, if the refrigerator is in a damp room or the power is often cut off).

Myth 5: “The big box can be turned off.”

❌ True: In 99% of models it is impossible — the system No Frost is integrated into the overall cooling circuit. The exception is some premium refrigerators (for example, Liebherr CN 4815), where you can switch between modes.

💬 Advice from the experts: If you hear that the fan in the big box works without stopping, this is not always a breakdown. In hot weather or when loading a large amount of warm products, it can work in enhanced mode up to 1–2 hours in a row.

FAQ: Answers to frequently asked questions

Is it possible to replace the fan in a big box yourself?

Theoretically, yes, but this requires experience. The fan is secured with latches or screws, and its connector is connected to the control board. The main risks:

• damage to the wiring during dismantling;
• incorrect installation of the blades (can cause vibration);
• dust getting into the evaporator.

If you are not confident in your abilities, it is better to contact the service. The cost of replacing a fan in a workshop is from 2,500 to 4,000 RUR (depending on the model).

Why are food covered in ice in a freezer with a big box?

This happens due to:

• not tightly closed door (warm air gets inside and condenses);
• chamber overload (products block air circulation);
• seal malfunction (rubber could crack or deform).

Check for ice on the body of the big box - if there is, defrost the freezer for 12 hours and dry it.

How to check if the big box is working?

Simple test:

1. Place the thermometer on the middle shelf of the refrigerator.
2. After 2 hour, check the temperature - it should be +4°C (deviation is acceptable ±1°C).
3. Open the door and listen - if the big box is working properly, after 1-2 minutes after closing you will hear the fan starting.

If the temperature is not is stable or the fan does not turn on, diagnostics are required.

Is it possible to place a refrigerator with a big box on the balcony?

🚫 No! The big box is sensitive to:

• temperature changes (with below 10°C oil in the compressor thickens, and when above 30°C the fan overheats);
• humidity (can cause corrosion of the evaporator);
• direct sunlight (the plastic turns yellow and becomes fragile).

If there is no other choice, choose a model with climate class SN-T (for example, Beko GNE114620X), designed to work in +10...+43°C.

Why does a smell appear in a refrigerator with a big box?

Causes and solutions:

• Clogged drainage hole → wash it with a soda solution.
• Mold in the big box → wipe the evaporator with hydrogen peroxide.
• Spoiled products → check if the packaging is leaking somewhere.
• Wear of carbon filter → replace it (cost from 500 ₽).

For prevention, use an odor absorber (for example, Zepter Bio Fresh).