Buying new household appliances is always an exciting moment, especially when it comes to large equipment such as refrigerator. After a long wait, choosing a model and arranging delivery, the long-awaited box is delivered to you, and there is a strong desire to immediately unpack it, install it in the kitchen and start it up to check its operation or cool drinks. However, haste in this matter can be fatal for an expensive unit.
The main question that worries every owner: how long is it allowed to turn on the device after it has been brought into the room? The answer to this depends not only on the model, but also on transportation conditions, outside temperature and the design of the compressoritself. Ignoring the waiting rules can lead to failure of the cooling system, which will entail expensive repairs or a complete replacement of the equipment.
In this article we will analyze in detail the physical processes occurring inside the refrigeration unit during transportation and determine the optimal time intervals for different situations. You will find out why manufacturers insist on a pause before starting and what risks are hidden by hasty switching on the electric motor.
Physics of the process: why you can’t turn it on right away
To understand the need for waiting, you need to look inside the device. The main element of the refrigerator is compressorwhich works like a pump, dispersing the refrigerant through a system of tubes. The crankcase of this compressor contains a special compressor oilnecessary for lubricating the rubbing parts and ensuring the tightness of the piston group.
During transportation, especially if the box was tilted, shaken or placed on side, this oil inevitably flows from the crankcase into the cooling system circuit - into the condenser or evaporator. If you turn on the unit immediately, the oil will not have time to return to the compressor, which will lead to “dry” operation. This causes rapid wear of parts, piston jamming and overheating.
⚠️ Attention: Oil getting into the cooling circuit also reduces the efficiency of heat transfer. The compressor will work with increased load, trying to reach the set temperature, which can lead to its combustion in the first minutes of operation.
In addition, during transportation in winter, moisture condensation occurs inside electronic components and on metal parts due to a sharp temperature difference. Instantly connecting a wet appliance to the network is guaranteed to cause short circuitwhich can damage the control board or motor windings.
What happens to the oil when tilted?
When the refrigerator is tilted more than 40 degrees, oil from the crankcase compressor flows into the discharge line. If you start the engine at this moment, it will try to compress the liquid (oil), which is impossible. This will lead to water hammer, broken valves or destruction of the compressor suspension.
Factors influencing settling time
There is no single figure that would be suitable for absolutely all cases. The time it takes to turn on refrigerator after delivery varies depending on several critical parameters. Understanding these factors will help you make the right decision and not guess, risking equipment.
The first and most important factor is the position of the case during transportation. If the refrigerator was transported strictly vertically, the risks are minimal, and the oil might not leave the crankcase. However, when transported lying down, even if the “top” marking is observed, the probability of oil migration into the system is close to 100%.
The second factor is the duration and intensity of shaking. Delivery by elevator, going down stairs with turns, driving on uneven roads - all this contributes to the active movement of technical fluids. The more active it was transportation, the more time it will take for the oil to drain by gravity back into the tank.
The third, but no less important aspect is the temperature regime. The difference between the temperature outside (or in the back of a car) and the temperature inside the apartment creates conditions for the formation of condensation. Humidity is the main enemy of electronics, and it also needs time to evaporate.
How long to wait in the summer: rules for the warm season
In the summer, when temperature changes are minimal or absent (if the equipment was transported in a closed car), the main concern shifts towards returning oil to the compressor. Manufacturers often indicate a minimum period in the instructions, but experienced craftsmen advise not to rely on the minimum.
If your new refrigerator was transported in an upright position and was not subjected to strong shaking, the minimum standing time is 2-3 hours. During this time, the oil that could have splashed into the system will have time to flow down under the influence of gravity.
If the equipment was carried up stairs with a strong slope or was transported in a back where the box could fall over, it is recommended to increase the pause to 4–6 hours. This is guaranteed to protect compressor from starting without lubrication.
Do not forget that summer is also a season of high humidity in some regions, so if you brought the unit in from the street after rain, let it stand by the open door for at least an hour to evaporate external moisture before connecting.
Winter risks: why you need to wait longer
Winter delivery carries a double threat. The first is the oil we are already familiar with, which in cold weather becomes more viscous and flows back into the compressor much more slowly. The second, and more dangerous problem is condensation.
When you bring a cold object from the street (or from an unheated warehouse) into a warm room, moisture instantly appears from the air on all metal and plastic parts, as well as inside the electronic board. This is a physical law. If you turn on electrical appliance with water inside, a short circuit will occur.
⚠️ Attention: In winter, the minimum acclimatization time for the refrigerator is 4 hours, but waiting for 8–12 hours (or the whole night) is considered optimal. Do not try to speed up the process by pointing heaters or hair dryers at the equipment - this can damage the plastic and seals.
Oil thickens at low temperatures, and it takes longer for it to become liquid enough to drain into the crankcase. Starting a compressor with frozen oil is equivalent to running without lubrication. Therefore, if the refrigerator was delivered in cold weather, be patient and leave it turned off overnight.
The influence of the type of compressor on the waiting time
Modern refrigerators are equipped with different types of compressors, and the design of the motor directly affects the operating requirements. Conventional piston compressors are more sensitive to the lack of oil, as they have many rubbing parts.
Inverter models, which are becoming increasingly popular, operate on a different principle and often have a more sealed design. However, that doesn't mean they don't need time to suck. Inverter compressors also use oil, and its entry into the cooling circuit is unacceptable.
Below is a table showing the recommended standstill time depending on transportation conditions and the type of situation:
| Transport conditions | Season | Recommended standstill time | Risk when switching on early |
|---|---|---|---|
| Vertical, without shaking | Summer | 2–3 hours | Low |
| With an incline / on stairs | Summer | 4–6 hours | Medium (oil) |
| Vertical | Winter | 4–6 hours | High (condensation) |
| Lying / strong shaking | Winter | 8–12 hours | Critical (oil + moisture) |
It is worth noting that some manufacturers of dual-compressor systems (separately on the refrigerator and freezer) require a longer wait, since the volume of oil in the system is larger, and the routes for its return may be longer.
The correct sequence of actions after delivery
To be sure of the long service life of your purchase, follow a clear algorithm of actions. Chaotic actions can negate all efforts for careful transportation.
First, you must carefully unpack the unit, remove all shipping materials, tape and foam. Pay special attention to the internal spacers, if they are between the shelves or doors, they must be removed.
☑️ First start of the refrigerator
After unpacking, wipe the internal chambers with a damp cloth and a mild detergent to remove factory dust and odors. Let the cameras dry. Then leave the refrigerator alone for the time you have calculated (depending on the season and delivery conditions).
When the standing time has expired, turn on the device, but do not load the products yet. Let it run idle for 1-2 hours until it reaches the desired temperature. Only after this can you fill the chambers with products.
⚠️ Attention: If, after turning on, you hear a loud knock, hum or clank, immediately unplug the device. This may indicate that the compressor is damaged or the oil has not had time to return. Contact the service center.
Frequent errors during the first start
Even knowing the rules, users often make mistakes that shorten the life of the equipment. One of the most common is installing the refrigerator close to the wall or in a niche without gaps for ventilation immediately after turning it on.
Another mistake is loading warm products or a large amount of food into chambers that have not yet cooled down. This forces the compressor to work at its limit in the first hours, which is extremely undesirable for new equipment.
It is also a mistake to believe that if the refrigerator “runs quietly” after turning on, then everything is fine. The absence of noise does not guarantee that oil has returned to the crankcase. Problems may appear later, when the lubricant resource is exhausted.
Is it possible to transport a refrigerator lying down?
Technically it is possible, but it is extremely undesirable. If transportation lying down is unavoidable, you can only lay it on the side opposite the outlet of the compressor tubes (usually indicated on the label), and the resting time should be maximum - at least 12 hours.
Remember that following simple rules of waiting is an investment in the longevity of your equipment. It’s better to lose one day waiting than years on repairs or buying a new unit.
What will happen if you turn on the refrigerator immediately after winter delivery?
At best, nothing will happen, and you will be lucky. At worst, moisture inside the electronics will cause a short circuit that will damage the control board or compressor. Repair in this case may not be subject to warranty, since a violation of operating conditions will be recorded.
Do you need to remove the shelves during transportation?
Yes, it is better to remove the glass shelves and transport them separately, wrapped in soft cloth. This will prevent them from moving and fighting, and will also make it easier to maneuver the body, tilting it less.
Is it possible to speed up the settling process with a hairdryer?
Absolutely not. Heating plastic parts and seals with hot air can deform them. In addition, sudden heating can lead to cracking of metal or plastic due to uneven expansion of materials.
Does the settling time depend on the brand (LG, Samsung, Bosch)?
The principle of operation of the compressor is the same for all brands. However, manufacturers may use different types of oils and design solutions. Always check the instructions for the specific model, but if it is lost, follow the general safety rules described above.
Is the refrigerator humming after turning it on - is this normal?
In the first hours of operation, a new refrigerator may hum louder than usual. This is due to the fact that the parts are grinding in and the refrigerant is actively circulating. If the humming does not turn into knocking or roaring, and after a couple of days it becomes quieter, this is normal.