After delivering new household appliances to the kitchen, owners often encounter strange phenomena: the compressor hums for hours, the side walls heat up, but the desired cold inside the chamber still does not occur. This is a normal reaction of modern equipment to the initial launch, but many users begin to panic, believing that they have purchased a defective unit. Understanding the physics of cooling processes will help you avoid unnecessary calls to the service center and unreasonable returns of defective goods.
The time of the first cycle of operation directly depends on the type of refrigerant, the volume of the chambers, the room temperature and even how long the device was turned off before turning it on. Initial start-up always takes longer than subsequent cooling cycles, since the system needs to cool not only the air, but also the cabinet itself, the shelves and the products that you plan to place there. It is important to distinguish between normal engine operation and signs of malfunction so as not to miss real problems with tightness or electronics.
In this article we will look in detail at how long it takes your new refrigerator to reach temperature, why it may not turn off for several hours in a row, and what factors influence this process. We will consider the technical features of various types of compressors, the nuances of operation in hot weather and give clear recommendations for operation on the first day. Inverter models classic NoFrost systems behave differently, and knowledge of these differences is critical for proper care of the equipment.
Physics of the process: why the first cycle is the most long
When turned on for the first time, the refrigerator is a system whose internal components temperature is equal to the ambient temperature. The task of the compressor is not just to cool the air, but to remove heat from the chamber walls, evaporator, condenser and all internal elements. This process is called primary cooling, and it requires significantly more energy and time than maintaining the already achieved temperature regime. The engine runs continuously until the sensors record the achievement of the specified parameters at all points in the refrigerator and freezer compartments.
The duration of this stage is determined by the inertia of the materials. Plastic, metal shelves and glass surfaces have high heat capacity, so they slowly release heat to the refrigerant. In addition, in the first minutes of operation, the pressure in the circuit and the distribution of compressor oil occur, which also affects the efficiency of heat transfer. If there are already products in the chamber, the operating time increases in proportion to their mass and initial temperature.
Modern models with the system NoFrost or Total NoFrost require even more time for the first cycle, since they need not only to cool the volume, but also to run evaporator defrost cycles to ensure the correct operation of fans and heaters. A typical two-chamber refrigerator can reach temperature from 2 to 6 hours, while large multi-chamber units or models with a freshness zone can work non-stop for up to 10-12 hours in the first cycle.
⚠️ Attention: If the refrigerator runs without stopping for more than 24 hours when empty at normal room temperature, this may indicate a freon leak, a malfunctioning thermostat, or problems with starting relay. In such a situation, you need to contact the service.
Standard operating time and influencing factors
There is no single figure that would suit all models without exception, since manufacturers have different algorithms work in electronic control modules. However, it is possible to identify average time intervals that are typical for most household refrigerators. Understanding these standards will allow you to objectively assess the situation and not disturb the equipment over trifles.
Several key parameters influence the duration of the first cycle. Firstly, this is the volume of the chambers: the larger the displacement, the longer the primary cooling will last. Secondly, the type of refrigerant: modern green gases (for example, R600a) may require a longer time to reach the desired pressure and temperature compared to older counterparts. Thirdly, ambient temperature: if you start the refrigerator in a hot room (+25...+30°C), the engine will work longer and more intensely.
- 🕒 Standard two-chamber refrigerator (250-350 l) - 3-6 hours of continuous operation.
- ❄️ Models with the NoFrost system - 4-8 hours due to the need for air circulation and defrosting.
- 🏢 Large multi-chamber devices (400+ l) - up to 10-12 hours in the first cycle.
- 🌡️ At high ambient temperatures, the operating time can increase by 30-40%.
Important keep in mind that after reaching the target temperature, the compressor must turn off (in models with a conventional motor) or reduce speed (in inverter models). If this does not happen within the above intervals, it is worth checking the tightness of the door and the absence of drafts blowing on the body.
Features of operation of inverter and linear compressors
Compressor production technologies have stepped far forward, and today two main types of motors dominate the market: traditional (start-stop) and inverter. The behavior of these systems when first launched is radically different, which often misleads users. If you are the owner of equipment with inverter motor, you may notice that your refrigerator practically does not turn off.
This is not a malfunction. Inverter technology involves running the engine at low speeds to maintain temperature, rather than constantly turning on and off at full power. When first started, such a compressor will operate continuously, gradually reducing power as it approaches the set parameters. It can hum quietly and monotonously for many hours, creating the illusion of “eternal” operation, but the energy consumption will be minimal.
Linear compressors, often found in LG equipment, also have their own characteristics. They start smoothly and can run longer than their conventional piston counterparts, but do so with less noise and vibration. For the first time, such a system may not turn off for up to 12 hours, which fully complies with the manufacturer’s technical regulations.
⚠️ Attention: Do not try to “help” the refrigerator by opening the door more often to check the cold. Each such leak in the seal resets the cooling progress and forces the compressor to work even longer.
Why is the inverter quieter?
The inverter compressor does not experience peak loads at start, since it does not stop completely, but only changes the rotation speed. This reduces wear of mechanical parts and noise levels.
The influence of ambient temperature and transportation
The conditions in which the refrigerator was located before it was turned on play a huge role. If the device was transported in the cold season or simply stood in an unheated warehouse, its internal components could cool below the permissible limit, or, conversely, overheat in the summer. Temperature conditions operation is indicated in the instructions (usually from +10°C to +32°C or +43°C for tropical versions).
If the refrigerator was brought in from the cold, it should absolutely not be turned on right away. Condensation formed inside electrical circuits can cause a short circuit. In addition, compressor oil thickens at low temperatures and loses its lubricating properties. Starting a “cold” engine will lead to rapid wear or seizure. It is necessary to allow the equipment to warm up to room temperature within 4-6 hours.
The horizontal installation level is also important. If the refrigerator is tilted, oil may leak into the cooling circuit, causing water hammer when starting up. In the first cycle, this may appear as loud knocking or humming sounds. Make sure that the legs are adjusted and the doors close tightly under their own weight.
| Operating conditions | Impact on the first cycle | Recommended action |
|---|---|---|
| Room temperature +15°C | Increasing the temperature rise time | Do not load with food, wait for stabilization |
| Room temperature +30°C | The engine is running at the limit, overheating is possible | Ensure ventilation, do not place near the stove |
| Transport lying down | Risk of oil getting into the circuit | Stand vertically for at least 12-24 hours |
| High humidity | Formation of condensation on the walls | Wipe dry before turning on |
☑️ Check before first turn on
Is it necessary to load food at the first start
One of the most common questions: is it possible to immediately fill a new refrigerator with food? The answer is clear: first start must take place with empty cameras. Loading with warm or even room temperature products will create an excess heat load that the compressor may not be able to handle normally. This will lead to incorrect operation of the thermostat and an increase in the cycle time.
The ideal scenario looks like this: you turn on an empty refrigerator, let it run the first full cycle (until it turns off or reaches operating mode), and only after that you begin to gradually load it with contents. If there is an urgent need to put food in at once, do it in small portions, giving the system time to restore the temperature balance after each load.
This is especially critical for the freezer. If you throw several kilograms of meat or vegetables there at once, the temperature inside will jump sharply, and already frozen foods may begin to thaw while the refrigerator tries to cool the new mass. Quick freezing zone (Super Freeze) may help, but it is better not to test the equipment for strength in the first hours.
⚠️ Attention: Never put hot or warm food in the refrigerator. This disrupts the microclimate inside the chambers and forces the compressor to operate in emergency mode, which is especially dangerous when first started.
Typical sounds and phenomena during initial operation
A new refrigerator is a complex mechanism in which active physical processes occur. When you first start it, you may hear sounds that are not present in normal use. Gurgling, hissing, clicks and even a slight crack of plastic - all these are normal variants. Refrigerantmoving through the tubes, it makes characteristic sounds, especially when the system is just filling and reaching operating pressures.
Plastic cracking often occurs due to thermal expansion and contraction of the materials of the internal walls and shelves. As the temperature changes from room temperature to negative (freezer) or low positive values, the linear dimensions of the materials change, causing sound effects. Usually, after 1-2 days of operation, these sounds become quieter or disappear completely.
It is also worth paying attention to the heating of the side walls. In modern models, the condenser (heat exchanger) is often built into the side walls of the case, rather than located at the back in the form of a black grille. Therefore, heating the sides to 40-50°C in the first hours of operation is a sign of the correct operation of the heat removal system, and not a defect.
Frequently asked questions (FAQ)
The refrigerator has been running for 8 hours and does not turn off, is this normal?
For the first start, this is quite normal, especially if the room is hot or the model has a large volume. Let it run for up to 12-24 hours. If after this it does not turn off (or does not slow down), check that the door is tightly closed and that there are no hot objects inside.
Is it possible to turn on the refrigerator immediately after delivery if it was carried vertically?
Technically it is possible, but manufacturers recommend waiting 2-4 hours. This is necessary so that the compressor oil, which could be agitated during shaking, flows back into the engine crankcase. This will extend the life of the unit.
Why is the freezer compartment cold, but the refrigerator compartment is warm?
During the first hours of operation, the cold is distributed unevenly. Air must circulate throughout all chambers. Wait until the end of the first full cycle (usually 4-6 hours) before drawing conclusions about the malfunction.
Do you need to defrost a new refrigerator before using it for the first time?
No, new refrigerators do not require defrosting before first use. However, they must be washed inside with warm water and soda to remove factory dust and the smell of new plastic.
What to do if the refrigerator makes a loud knock when starting up?
A single knock when starting or stopping the compressor is the norm (the valve or relay is working). If the knocking is repeated and loud, like metal hitting metal, the refrigerator may have been damaged during transportation or installed incorrectly (concerns the rear grille of the wall).