After delivering new household appliances home and installing them in the kitchen, a situation often arises when the unit begins to work in increased mode. This is an absolutely normal phenomenon, which is explained by the physical processes occurring inside the cooling system. The owner must understand that first start-up is significantly different from the normal operation of an already run-in device, since the internal chamber is empty and warmed up to room temperature.
The time required to achieve the specified parameters may vary depending on the model, type of refrigerant and environmental conditions. If you notice that the motor is humming continuously, do not panic, because the system takes time to stabilize the pressure and create heat balance. In this article we will look in detail at why this happens and when to sound the alarm.
It is important to note that modern inverter models can behave differently than older linear units, working almost non-stop, but with low power. Digital sensors they control the process and do not allow the compressor to turn off earlier time if the target temperature has not yet been reached. Understanding these nuances will help you avoid false calls from the technician and unnecessary stress.
Physics of the process: why does the refrigerator work for a long time
The main reason for the long operation of the motor at start-up lies in the need to cool not only the air, but also all objects located inside the chambers. The walls, shelves, drawers and the body itself have an ambient temperature, and their cooling requires significant energy consumption. Refrigerant must circulate through the system until the heat capacity of the internal elements is fully compensated.
In addition, the correct oil and freon circulation system must be established pressure. During transportation, compressor oil may have partially flowed into the evaporator or condenser circuit and takes time to return to the engine crankcase. If you start the device immediately after horizontal transportation, it may work longer than usual or even fail.
⚠️ Attention: If the refrigerator was transported lying down, be sure to let it stand in an upright position for at least 4-6 hours (preferably 12) before turning it on, so that the oil flows back into the compressor.
Heat inflows also play an important role: while the chamber walls warm, the thermostat or electronic control module records a high temperature and does not give a command to stop. Only after the sensors record the achievement of the specified values, the work cycle will be interrupted. In hot weather, this process may be delayed due to more active heat exchange with the external environment.
Standard operating time indicators for different types of equipment
The answer to the question of how long the compressor operates directly depends on the type of cooling system. Devices with drip system (Direct Cool) usually reach temperature faster, since the volume of cooled space is often smaller and the design is simpler. In such models, the first cycle can last from 2 to 4 hours.
Technology No Frost involves a more complex system of air ducts and fans, which requires more time to distribute cold air evenly throughout all chambers. Here, continuous work for 5-8 hours is considered normal. Two-compressor models may behave differently: one motor may turn off earlier if it is responsible only for the refrigeration chamber, which cools faster than the freezer.
Below is a table with approximate data on the time of the first operating cycle:
| Refrigerator type | Cooling system | Approximate time (hours) | Features |
|---|---|---|---|
| Single-chamber | Drip | 2 - 3 | Quick temperature set |
| Double-chamber | Drip / No Frost | 4 - 6 | Requires cooling of two zones |
| Side-by-Side | Total No Frost | 6 - 10 | Large volume of chambers and complex system |
| Inverter | Any | Constantly (with breaks) | Works without stopping, changing power |
It is worth considering that these values are averaged. Compressor power and the thermal insulation efficiency of a particular brand also makes its own adjustments. For example, premium models with vacuum panels may cool faster, but their initial setup takes a standard time.
The influence of temperature and operating conditions
The environment dictates its own rules for the operation of refrigeration equipment. If the air temperature in the room where the unit is installed is +25...+30°C, then heat exchange occurs more slowly. The compressor has to work harder to remove heat from the condenser, which in such conditions becomes hotter than usual.
It is also important to consider the temperature of the products that you load inside. An empty refrigerator will cool down faster than a fully loaded one. However, if you immediately fill the chambers with warm products, the operating time may increase by one and a half to two times. Thermoregulator will keep the motor on until the entire mass of products has cooled.
⚠️ Attention: Never load hot or warm foods into a new refrigerator for the first time switching on This will create a critical load on the compressor and can lead to premature wear.
The location of the equipment also matters. If the refrigerator is located close to the wall or in a niche with poor ventilation, the efficiency (heat transfer) decreases. As a result, Cycle time increases and energy consumption increases. For normal operation, a gap of 5-10 cm is required from the back wall to the furniture.
Differences between linear and inverter compressors
The modern household appliance market offers two main types of motors, and their behavior when starting is radically different. Linear compressors operate on the “on-off” principle. When first started, they operate at full power until the temperature is reached, after which they turn off. This creates characteristic noise and vibration.
Inverter models, such as Digital Inverter from Samsung or Linear Inverter from LG, behave differently. They may not turn off at all, but only reduce the speed to a minimum to maintain the temperature. Therefore, when turned on for the first time, such a refrigerator can hum continuously throughout the day, and this is normal mode, and not a malfunction.
How to distinguish an inverter refrigerator?
Usually there is a mark “Inverter” on the front panel or in the instructions. Also, such models operate much quieter and do not have sharp clicks when turning on and off, characteristic of linear motors.
The advantage of the inverter system is the absence of peak loads on the network and on the mechanism itself at each start. Electronics smoothly regulates the speed of rotation of the piston, which allows you to accurately maintain the temperature without large changes. When first turned on, the system can test the sensors for a long time and gradually return to operating mode.
Algorithm of actions when starting the refrigerator for the first time
To ensure long and uninterrupted operation of the equipment, it is necessary to follow the correct procedure. Ignoring simple rules can lead to the compressor not working correctly or failing on the first day. Below is a step-by-step preparation plan.
First make sure that the transport fastenings (bolts, bars, tape) are completely removed. Then let the device sit. After this, you can start connecting.
☑️ Check before turning on
After turning on the power supply, set the temperature regulator to the middle position. Do not immediately turn it to maximum, this will create excess pressure in the system. Let the refrigerator idle for at least 2-3 hours before loading food. This will allow the system to reach nominal mode without unnecessary thermal load.
If you are using smart features such as Smart Diagnosis or control via Wi-Fi, connect the device to the network only after it has completed the first cycle. This will help avoid synchronization errors and overloading of the control module at the time of peak current consumption.
Alarming symptoms: when you need to call a technician
Although prolonged work at startup is the norm, there are signs that indicate real problems. If the compressor has been running for more than 12-14 hours, and it is warm inside the refrigerator (above +10°C in the main chamber), this is a cause for concern. It is also worth paying attention to casing temperature: the side walls may be warm, but the rear grille should not be hot.
Extraneous sounds, such as knocking, clanging or a loud hum that changes tone, indicate a mechanical malfunction. In a working device, only a uniform hum and the sound of flowing refrigerant can be heard. If you hear the relay clicking every few seconds, and the motor does not start, this is a sign of a breakdown of the start relay or the compressor itself.
⚠️ Attention: If the refrigerator has been running for more than 12 hours and does not cool, or if a “fur coat” (ice) forms on the back wall inside the chamber the first time you start it in No Frost mode, immediately turn off the device and contact service.
Another important symptom is the smell of burning or melted plastic. This may indicate overheating of the wiring or motor. In this case, operation must be stopped immediately to avoid a fire.
Frequently asked questions (FAQ)
Is it possible to load food into the refrigerator immediately after turning it on for the first time?
Strongly not recommended. The refrigerator needs time (at least 2-3 hours) to cool its own volume and enter operating mode. Loading warm food will immediately create a critical load on the compressor, which can shorten its service life.
Why does the refrigerator turn on and off too often on the first day?
Frequent turning on (short cycle) may indicate incorrect installation of the thermostat, a loose door fit, or a refrigerant leak. Also, the cause may be overheating of the compressor due to poor ventilation at the back.
Is it normal that the side walls of the refrigerator get very hot?
Yes, this is normal. In modern models, the condenser (heat exchanger) is often built into the side walls. When the compressor is actively operating, especially during the first start, they can heat up to 40-50°C. Over time, when the temperature stabilizes, the heating will become less noticeable.
What to do if the refrigerator has not turned off for a day?
Check the tightness of the door closure, the absence of drafts and the temperature in the room. If the refrigerator is working properly, but does not turn off for more than 24 hours and does not get cold, this is a malfunction (freon leak, thermostat failure or capillary tube clogged). A specialist diagnosis is required.