Owners of modern refrigerators are often faced with a situation where the system No Frost, designed to get rid of defrosting, begins to cause complaints. The noise of a fan, drying out of food, or a banal desire to return natural humidity to the chambers prompts us to think about how to make a regular unit out of a No Frost refrigerator. Technically, this procedure is quite feasible, since such models are structurally based on standard compressors and evaporators, but lack an automatic defrost cycle or have it in a simplified form.
Before proceeding with an electrical appliance, you must clearly understand that you are actually turning off the forced air circulation system and heating elements. This returns the refrigerator to the operating principle of the old “crying” models, where cooling occurs due to natural convection. However, it is worth remembering that tampering with the electrical circuit may affect the warranty, so you perform all actions at your own peril and risk. modifications electrical appliance, you must clearly understand that you are actually turning off the forced air circulation system and heating elements. This returns the refrigerator to the operating principle of the old “crying” models, where cooling occurs due to natural convection. However, it is worth remembering that tampering with the electrical circuit may affect the warranty, so you perform all actions at your own peril and risk.
The main goal of such a modification is to stop the fan and eliminate heating of the evaporator, leaving the compressor to work only for cooling. As a result, condensation will begin to form inside the chamber, which will flow down the back wall, as in classic models. This will require you to be more attentive to defrosting, but will solve problems with dry air and excess noise.
Fundamental differences between cooling systems
To competently redo refrigerator, you need to understand the difference in the physics of the processes. In the No Frost system, cold air is generated by an evaporator hidden behind a plastic panel and distributed through the chambers by a fan. In a conventional system, often called a “crying” one, the evaporator is located directly on the back wall of the chamber or in a foamed space, and the air circulates by gravity.
The key element that will have to be neutralized is Defrost heating element and the sensors that control its operation. In the factory version, they are turned on according to a timer or thermostat readings to melt the ice on the evaporator. When switching to normal mode, these elements become redundant, since the ice will melt naturally when the compressor is turned off.
- 🌀 Circulation: in No Frost the fan operates, in normal mode the air moves slowly and silently.
- 💧 Humidity: system without forced airflow keeps the products juicy much longer.
- ❄️ Frost: After the alteration, a snow coat will begin to form on the back wall, requiring manual defrosting.
It is important to note that in two-chamber models with one The compressor often uses a Full No Frost or combined system, where there may already be a drip system in the refrigerator compartment, and a fan system in the freezer compartment. Your task may be to turn off only the freezer or the entire system, depending on the design.
⚠️ Attention! Before starting any work to disable the controls, be sure to disconnect the refrigerator from the electrical outlet. Working with live electrical wiring is deadly.
Necessary tools and preparation
In order to make an analogue of the good old ZIL or Biryusa out of a modern refrigerator, you will need a minimum set of tools. The main difficulty lies not in the technical part, but in accurate access to the insides of the unit without damaging the thermal insulation and plastic elements.
You will need a standard screwdriver (often a Phillips screwdriver or with special bits), side cutters for cutting wires, electrical tape or heat shrink to insulate connections. It will also be useful to use a multimeter to test the circuits and make sure that you have disconnected exactly those wires that lead to the fan and heating element.
☑️ Preparation for rework
Determine the model of your unit in advance. Brands LG, Samsung or Indesit the layout of the nodes may differ. Some models have the fan located at the top of the freezer, while others have it on the side or back. Studying the technical documentation or diagrams for your specific model will greatly simplify the task.
Technology for turning off the fan and heating element
The conversion process itself comes down to breaking the electrical circuit that powers the fan motor and heating element. In most cases, these components are powered in parallel via a control module or mechanical timer. Your task is to find the wires going directly to the consumers in the chamber and disconnect them.
First get to the evaporator. To do this, you will have to remove all the shelves, drawers and dismantle the plastic back panel in the freezer. Underneath it you will see an aluminum evaporator radiator, to which heating elements are attached (often in the form of a curved tube or nichrome thread in a casing) and sensors. There is a fan nearby.
Difficulties with electronic control
In models with an electronic control module, turning off the fan may cause an error on the display. The refrigerator may go into protective mode and stop turning on the compressor. In such cases, it is necessary to resolder the circuit or install a load emulator, which only professional craftsmen can do.
Find the wires going to the fan. Usually there are two. Carefully cut them as close to the fan itself as possible so as not to damage the rest of the wiring. Be sure to insulate the ends of the wires. Carry out a similar procedure with the wires going to the defrost heating element. If the heating element is built into the evaporator body and does not have obvious wires, you may have to cut the contacts on the terminal block.
- 🔌 Insulation: use high-quality insulating tape that is resistant to low temperatures to avoid short circuits.
- 🔍 Check: after rework, make sure that the compressor starts, but the fan is silent.
- 🧊 Test: the first cycle of operation will show how effective the cooling is without forced airflow.
Some experts advise not to cut the wires, but to disconnect them from connector chips, if the design allows it. This is a more civilized way, allowing you to return everything back if necessary. However, in cheap models there are often no connectors, and the wires are twisted or soldered directly.
Comparison of characteristics before and after alteration
After you managed to make a normal one out of a No Frost refrigerator, its operating characteristics will change. It is important to understand what you are losing and what you are gaining. Below is a table showing the key differences in operating modes.
| Parameter | No Frost Mode (Factory) | Normal Mode (After Rework) |
|---|---|---|
| Ice Formation | None (automatic defrosting) | Formation of a fur coat on the walls |
| Humidity | Low (products dry out) | High (fresh products) |
| Noise | There is fan noise | Only compressor hum |
| Energy consumption | Higher (operation of heating element and fan) | Lower (only compressor) |
As can be seen from the table, the main advantage of the rework is maintaining the freshness of products. Vegetables and fruits in a regular chamber without powerful blowing with dry air wither much more slowly. In addition, the constant background noise disappears, which for many is a decisive factor, especially if the refrigerator is in the kitchen-living room.
However, there is a flip side to the coin. You will have to independently monitor the thickness of the ice crust on the back wall. As soon as the layer of snow becomes noticeable (about 0.5–1 cm), the refrigerator will need to be defrosted. Depending on the frequency of opening the door, this will have to be done once every 3-6 months.
Possible problems and operating nuances
A converted unit may not behave the same as an ideal factory “crying” refrigerator. Since the design of the chamber and the location of the channels were initially designed for forced circulation, zones of air stagnation may form in the corners. This can lead to uneven cooling.
Another problem is condensate drainage. In the No Frost system, water from melting ice is discharged into a special tray above the compressor through a drainage hole. When switching to normal mode, there may be more water, and if the drainage hole becomes clogged or cannot cope, water may flow onto the floor or freeze in the channel, forming an ice plug.
⚠️ Attention! Some models have a drainage system designed to remove small amounts of water during defrost cycles. When a large fur coat naturally melts, the flow may be too powerful, which will lead to the tray overflowing.
It is also worth considering that compressor in the No Frost mode it often works in a more intense mode to compensate for heat loss due to frequent opening of the door and blowing. In normal mode, the load on it may decrease, which will have a positive effect on the service life of the motor. However, if the thermostat is set to very low temperatures, the refrigerator may work longer without interruption, trying to cool the volume without the help of a fan.
Is it worth the gamble candles: final analysis
The decision to turn No Frost into a conventional system must be balanced. If your goal is to keep food from drying out and eliminate noise, remodeling makes sense. This is especially true for models where the defrosting system has already failed, and replacing sensors or timers is expensive or impossible.
If the refrigerator is working, but you are simply annoyed by the dry air, it is easier to use special containers with hydrozones or simply cover the food. Mechanical intervention in the electrical system always carries risks, and returning everything to the way it was can be more difficult than it seems, especially if you have cut the wires in a hard-to-reach place.
Ultimately, you get a hybrid: a modern case and shelves, but with the functionality of last century equipment. For many, this is the optimal compromise that allows you to extend the life of the unit and adapt it to your food storage habits.
Frequently asked questions (FAQ)
Is it possible to simply pull out the fan chip without cutting the wires?
Yes, in many models the fan and heating element are connected via connectors. If you find these chips on the control board or in the wiring harness going to the camera, disabling them is the safest and most reversible method. However, in budget models, the wires can be twisted directly.
Will the refrigerator freeze less easily after turning off No Frost?
Cooling will occur more slowly due to the lack of forced air circulation. The temperature at different points in the chamber may differ more than before. Products at the back wall may freeze, but at the door they may be warmer.
What should you do if, after modification, the refrigerator stops turning on?
In models with electronic control, turning off the load (fan) may be perceived by the module as a malfunction. In this case, the system blocks the compressor from starting. You will need to either restore the circuit by installing an emulator resistor, or reflash the module, which requires the services of a service center.
How often will the converted refrigerator need to be defrosted?
The frequency depends on the humidity in the room and the frequency of opening the door. On average, the fur coat grows in 3–4 months. You need to defrost when the layer of ice on the back wall becomes visible to the eye, usually 5–10 mm.