When choosing a new refrigerator or studying the instructions for an existing unit, users often encounter the incomprehensible term “plaka”. This word is puzzling, since it is not used in everyday life, and in the context of household appliances it sounds quite specific. In fact, we are talking about a widespread moisture removal technology, also known as a drip defrosting system.
Many owners of modern equipment do not even suspect that their device works exactly according to the principle plates, considering the absence of the need for manual defrosting to be the magic of engineering. However, there is a simple physical process behind it that requires understanding to operate correctly. In this article, we will analyze in detail how this mechanism functions, what advantages it has over the No Frost system, and how to avoid common maintenance mistakes.
Understanding the operating principle of the evaporator will allow you to extend the life of the compressor and maintain the freshness of your food. We will look at the internal structure of the rear wall, the role of the drainage hole and the temperature conditions at which the system operates most efficiently. This knowledge will help you quickly diagnose malfunctions if they arise in the future.
Definition of the term and origin of the name
The term “cry” comes from the verb “to cry.” In the context of refrigeration equipment, this means that the inner wall of the chamber is literally “crying”, becoming covered with droplets of moisture. This phenomenon is observed on the rear wall of the refrigerator compartment, where the hidden evaporator is located. Unlike open spirals in older models, here the heat exchanger is walled into the wall of the housing.
The essence of the process is a cyclic change in the surface temperature of the evaporator. When the compressor operates, the wall cools and moisture from the air in the chamber condenses on it, turning into frost or an ice crust. The moment the thermostat turns off the compressor, the wall temperature begins to rise and the ice melts, flowing down as water. It is this visual effect that gave the technology its name.
- ❄️ Plachka is the common name for a drip automatic defrosting system.
- 💧 The name reflects the visual effect of water droplets running down the back wall.
- 🔧 The technology is used exclusively in the refrigerator compartment, but not in the freezer chamber.
It is important to understand that drip system is not a separate type of refrigerator, but rather a way of organizing moisture removal. Manufacturers may call this by different names: Direct Cool, Low Frost or simply “automatic defrost”. However, the physical essence remains the same: water condenses on the wall and is removed by gravity.
⚠️ Attention: Do not confuse the weeping system with the No Frost system. In No Frost refrigerators, moisture is blown out of the chamber by a fan and evaporates in the tray due to the heat of the operating compressor, so the walls there are always dry and frost does not form at all.
The principle of operation of the drip defrosting system
Operation of the “plate” system depends on the operation of the compressor and thermostat. While the unit cools the air, the rear wall, behind which the evaporator is hidden, has a negative temperature. The moisture contained in the chamber air and released by the food settles on this cold surface. A layer of frost gradually forms, which, however, does not have time to become too thick thanks to frequent cycles of on and off.
As soon as the temperature inside reaches the set value, the thermostat gives a command to turn off the compressor. At this point the defrost phase begins. The back wall heats up from the heat of the body itself and the air in the chamber. Frost turns into water. Drainage holelocated in the lower part of the rear wall, collects this water and drains it into a special tray located above the compressor.
The water in the tray is heated by the operating motor-compressor and simply evaporates into the environment. This entire process occurs automatically and does not require user intervention. Defrost cycles can occur several times a day, depending on the temperature settings and frequency of door opening.
Why doesn’t frost turn into a block of ice?
Frost does not have time to grow in a thick layer, since the compressor in modern models is often turned on for short periods of time. In addition, the thermal conductivity of the wall is selected so that the ice quickly melts when the engine stops.
Operation efficiency directly depends on the serviceability of the thermostat. If he turns off the compressor too rarely, the frost may not have time to completely melt, which will lead to the formation of ice. Therefore temperature calibration is critical for the proper operation of the tray.
Design features and device
Visually, the refrigeration compartment with the tray is easy to distinguish by the smooth back wall. Behind the plastic is an aluminum evaporator, which is often called “crying”. Unlike No Frost, there are no complex air ducts and fans in the refrigerator compartment, which makes the design simpler and cheaper to manufacture.
The key element of the system is the drainage channel. This is a small hole with a diameter of about 1 centimeter, located centrally or offset at the bottom of the rear panel. It connects the inner chamber to the outer evaporation pan. Often, a plastic groove is installed at the outlet of the channel, directing water exactly into the hole.
| System element | Location | Function |
|---|---|---|
| Evaporator | Behind the back wall | Air cooling and moisture condensation |
| Drainage hole | At the bottom of the rear wall | Removal of melt water from the chamber |
| Collection tray | Above compressor | Collection and evaporation of condensate |
| Thermostat | Inside the chamber or on the body | Adjustment of compressor operating cycles |
It is worth noting that in some models the drainage hole may be hidden by a decorative plug with a slot. This is for aesthetics, but requires more careful cleaning. The design must ensure unimpeded flow of liquid, so any blockages in the channel are unacceptable.
Advantages and disadvantages of technology
Like any engineering system, a weeping system has its strengths and weaknesses. The main advantage is the preservation of natural humidity in the chamber. Unlike No Frost, where the air constantly circulates and dries, here the products do not air out so quickly. This is especially important for storing vegetables, fruits and herbs.
The second plus is the quietness of operation. The absence of a fan in the refrigerator compartment makes the operation of the unit almost silent. Users also note the lower cost of equipment with such a system and lower energy consumption, since there is no energy consumption for the operation of the fan and defrost heaters (in some models).
- 🥬 The products retain natural humidity and dry out less.
- 🤫 Quieter operation compared to forced circulation systems.
- 💰 Affordable price and maintainability of the main components.
However, there are also disadvantages. The main one is the need to periodically manually defrost the freezer if it is not equipped with a No Frost system. In addition, the temperature regime at different points of the chamber may differ: it is colder at the back wall than at the door. This requires proper distribution of products.
Another nuance is the risk of the formation of an ice coat if the door is frequently opened or the seal is broken. If a lot of warm, humid air enters the chamber, the weeping system may not cope with its disposal, and an ice build-up will form on the wall.
⚠️ Attention: Do not place food close to the back wall. This disrupts air circulation and can lead to the packaging freezing to the surface of the evaporator, which will damage the products and impede the outflow of water.
Operation rules and placement of products
For the correct operation of the “cable” system, it is important to properly organize the internal space. Cold air is heavier than warm air, so it sinks down, but in models with a wedge, convection at the rear wall is also important. Products should be placed so as not to block air access to the cooling surface.
Particular attention should be paid to packaging. It is better to store liquid products in closed containers so that excess moisture does not evaporate into the chamber and does not settle on the wall in the form of excess ice. It is recommended to keep vegetables and fruits that produce a lot of moisture in special boxes with humidity control.
Temperature also plays a role. If you set the temperature to minimum (maximum cooling), the compressor will run almost without interruption. In this case, the defrost phase may not occur for a long time, and the wall will become covered with ice. The optimal mode is +4...+5°C.
Regularly check the condition of the rubber seals on the door. If they are worn out or dirty, warm air saturated with moisture will constantly enter the chamber. The weeping system simply will not have time to remove such a volume of water, and a puddle will appear at the bottom of the chamber, and a snowdrift on the wall.
Typical problems and methods for eliminating them
The most common problem of owners of refrigerators with weeping is water at the bottom of the refrigerator compartment. Most often the reason lies in a clogged drainage hole. Crumbs, packaging particles, or mucus from bacteria can clog the duct. This can be solved by carefully cleaning the hole with a special soft brush or a cotton swab.
The second common problem is food freezing to the back wall. This happens if food touches the cold evaporator. You cannot tear off food by force, as you can damage the thin wall of the evaporator, which will lead to freon leakage. It is necessary to defrost the refrigerator and carefully separate the food.
☑️ Diagnosis of weeping problems
If the water does not drain and the drainage hole is clean, the drainage channel inside the case may have frozen. This often happens during the winter or when the thermostat is faulty. In this case, it may be necessary to completely defrost the unit in the off state for 12-24 hours.
⚠️ Attention: It is strictly forbidden to clean the drainage hole with sharp metal objects (knife, wire). You can puncture the channel or damage the evaporator, which will lead to expensive repairs with refrigerant refills.
Care and prevention of blockages
For the weeping system to work like a clock, it needs minimal but regular maintenance. It is enough to carry out preventive cleaning of the drainage area once every 3-4 months. This will take no more than 5 minutes, but will save you from the appearance of puddles and unpleasant odors.
For cleaning, you can use warm water and a mild detergent. If the hole is very clogged, you can use a medical bulb (syringe) to flush the channel with water under low pressure. There are also special brushes for cleaning drainage, which can be bought at hardware stores.
Do not forget to wash the groove itself near the hole. Dirt often accumulates there, which over time turns into a hard coating. After washing, be sure to wipe the wall dry and leave the door open for some time for ventilation.
Comparison with other cooling systems
When When choosing technology, consumers often hesitate between “cry” and “No Frost”. Understanding the difference helps you make informed choices. If freshness of vegetables and absence of drafts are your priority, Plaka wins. If complete autonomy and no need to defrost the freezer are important, it is better to choose No Frost or a combined system.
There are also refrigerators with the Low Frost system. This is an improved version of the cryka, where the evaporator is located around the perimeter of the chamber or has a special design that reduces ice formation significantly. In such models, defrosting is required even less frequently, but the principle of moisture removal remains the same.
Ultimately, the “plough” is a time-tested, reliable and economical technology. It is ideal for those who are ready to defrost the freezer once a year, but want to enjoy juicy products in the main compartment.
Does it need to defrost a refrigerator with a cryka?
Yes, the refrigerator compartment defrosts automatically, but the freezer (if it is not No Frost) must be defrosted manually 1-2 times a year to remove the layer ice.
Why does ice form on the back wall?
Ice is formed due to moisture condensation when the compressor is running. This is normal workflow. The ice should disappear the moment the engine stops. If the ice does not melt, check the thermostat or the frequency of door opening.
Is it possible to put hot food in the refrigerator with a cry?
It is strictly not recommended. Hot food will sharply increase the humidity and temperature, which will cause the compressor to wear out, and the weeping system will not be able to cope with the volume of condensate, which will lead to icing.
What to do if the drainage hole is frozen?
Do not try to pick out the ice with a knife. Unplug the refrigerator, open the doors and let the ice melt naturally. You can gently water the hole with warm water from a syringe without a needle.
Does weeping affect the shelf life of products?
On the contrary, the absence of constant blowing with dry air (as in No Frost) allows products, especially vegetables and fruits, to retain moisture and freshness longer.