The situation when a new household appliance is delivered home, but connecting it immediately is not possible or is not recommended, is familiar to many. The question of how many hours the refrigerator cannot be turned on does not arise out of nowhere, since violation of the first start-up rules can lead to serious damage to expensive equipment. Often, owners ignore this stage, wanting to see the result faster, but haste in this case is fraught with failure of compressor or refrigerant leakage.
The waiting time directly depends on the transportation conditions and the ambient temperature in which the unit was located before installation. If you brought the equipment in the cold in winter, or transported it in a horizontal position, the oil mixture in the system could shift or thicken. Instantly starting the engine in such conditions is tantamount to running a car engine without oil - friction of parts will cause rapid wear or wedge.
In this article we will analyze in detail the technical reasons for the need to pause before turning on, consider various transportation scenarios and give clear recommendations for preparing the device for operation. Understanding the physical processes occurring inside refrigeration circuitwill help you avoid costly mistakes and extend the life of your equipment for many years.
Physics of the process: why the compressor needs time
The main element of any refrigeration system is the compressor, which works like a pump, circulating refrigerant through the pipes. In the crankcase of this mechanism there is a special compressor oilnecessary for lubricating rubbing parts and dissipating heat. In normal operation, this oil is located below, in a special chamber, and does not interfere with the circulation of freon.
During transportation, especially if the refrigerator was tilted or placed on its side, the oil inevitably flows into the evaporator and condenser pipelines. If at this moment voltage is applied to the motor windings, the piston will try to compress not only the gas, but also the liquid (oil). Since the fluids are incompressible, this causes water hammer, which can destroy the valves or break the connecting rod.
⚠️ Attention: Trying to start a compressor filled with oil often leads to jamming of the rotor and burning of the electric motor windings, which is a non-warranty case.
In addition, the oil must not just drain back into the crankcase, but also warm up to operating temperature. Cold oil has a high viscosity and does not circulate well, which increases the load on the starting winding. That is why thermostat and the thermal relay may not have time to operate during a sharp surge in current, and the motor will burn out even before it starts.
What happens to the oil at -10°C?
At negative temperatures, viscosity compressor oil increases several times. It becomes like thick honey or even grease. If you start a compressor with such oil, it will not have time to spread over the friction units in the first seconds of operation, which will lead to dry friction and instant damage to the bearings or piston group.
The influence of ambient temperature on the settling time
The temperature regime in which the refrigerator was before installation is a critical factor determining the duration pauses. The physical properties of materials and liquids change under the influence of heat and cold, and this cannot be ignored.
If the equipment was delivered in the warm season or simply stood in a heated room, the recovery processes are faster. However, even in this case, there is a minimum time threshold required to stabilize the pressure in the system and drain the oil film from the walls of the tubes.
In winter, the situation gets worse. At low temperatures, the metal contracts and the oil thickens. A sharp temperature change (from outside frost to room heat) causes condensation to form on electrical contacts and control boards. Turning on a wet appliance may cause a short circuit.
Experts recommend focusing on the following time intervals, depending on the conditions:
- 🌡️ Summer transportation: If the air temperature is above +15°C, it is enough to wait 2-3 hours for the temperatures to equalize and the oil to drain.
- ❄️ Winter transportation: At temperatures below 0°C, the waiting time increases to 4-6 hours, and in severe frosts (-20°C and below) it is better to leave the equipment alone for up to 12 hours.
- 🏠 Sharp change: If the refrigerator is brought from the cold into a hot room, let it stand for a minimum 6-8 hours to avoid the formation of condensation inside the electronics.
Horizontal or vertical transportation: is there a difference
The position of the refrigerator during transportation is the second most important factor influencing the “rest” time. Manufacturers always indicate in the instructions that equipment must be transported strictly vertically. However, the realities of life often dictate their own conditions, and refrigerators are transported lying in the trunk or on a trailer.
During vertical transportation, the risk of oil getting into the circuit is minimal, but it is possible with strong shaking and tilts of more than 40 degrees. In this case, the standard time for acclimatization is sufficient. If the unit was lying on its side, the oil was guaranteed to flow into the evaporator.
⚠️ Attention: Transportation in a horizontal position is permissible only for short distances and in compliance with the tilt angle specified in the product passport (usually no more than 40 degrees).
If the refrigerator was lying on the back wall, the oil could get directly into the compressor discharge zone. In such cases, the waiting time should be maximum - at least 8-10 hours, so that gravity does its job and returns the lubricant to the crankcase.
For clarity, let's compare the requirements for standing time depending on the position:
| Position during transportation | Tilt angle | Recommended time before switching on | Risks |
|---|---|---|---|
| Vertical | 0 degrees | 2-4 hours | Minimum |
| Inclined | up to 40 degrees | 4-6 hours | Medium (oil in tubes) |
| Horizontal | 90 degrees | 8-12 hours | High (oil in the compressor) |
First start-up: step-by-step instructions
After the required time has passed, you can’t just plug the cord into a socket and forget. The correct first launch is a procedure that requires your participation. It will help identify possible defects and ensure correct operation of the system.
First, you need to clear the internal space of shipping materials. Tape, foam pads and plastic bags must be completely removed. Pay special attention to the back of the compressor - sometimes there are shipping bolts or gaskets left there that need to be removed.
Next, you should install the refrigerator on a flat surface. Use a building level to check. The legs of the refrigerator are adjustable in height, which allows you to compensate for uneven floors. Correct installation is important for operation No Frost systems and silent operation.
☑️ Preparation for first use
Only after completing all the preparatory steps can you connect the device to the network. Please note that during the first hours of operation, the refrigerator may operate louder than usual - this is normal, as the system is returning to normal.
Typical errors when operating new equipment
Even knowing the rules, users often make mistakes that nullify all precautions. One of the most common is loading products immediately after switching on. The refrigerator needs time to reach temperature, and warm food will create excess load on the compressor.
Another mistake is installing the refrigerator close to a wall or furniture. For effective heat exchange, the rear grille must be open for air circulation. The minimum distance from the wall should be at least 5-10 cm.
Some users try to “deceive” the system by turning on the refrigerator a few minutes after turning it off. This is absolutely impossible to do. High pressure remains in the system and the compressor will not be able to start until the pressures have equalized. To do this, the system has a time relay, but it is better not to tempt fate.
Ignoring the operating instructions is a recipe for failure. The manual always indicates specific requirements for a particular model Bosch, LG, Samsung or other brands, which may differ from the general rules.
Frequently asked questions and expert answers (FAQ)
Is it possible to turn on the refrigerator 1 hour after delivery in the summer?
Technically, in the summer temperature and vertical transportation, one hour may be sufficient for acclimatization. However, oil may have risen through the pipes due to shaking. Experts advise not to take risks and wait a minimum of 2-3 hours to be sure of safe start-up.
What happens if you turn on the refrigerator immediately after winter transportation?
There is a high probability of hydraulic shock in the compressor due to thick oil. This can lead to a broken connecting rod, destruction of the valve group, or engine seizure. Repair in this case will be expensive or impossible.
Do you need to wash the refrigerator before turning it on for the first time?
Yes, definitely. Industrial contamination, dust or plastic smell may remain inside. Wipe the interior shelves and walls with warm water and a mild detergent, then wipe dry and let air out.
Why does the refrigerator hum after the first turn on?
For the first hours of operation, the compressor may work in increased mode to cool the entire volume of the chamber. Also, a hum can be made by the refrigerant passing through the pipes. If the noise does not subside after a day or is accompanied by vibration of the case, contact the service.