Buying a new refrigerator or moving to a new apartment is always stressful and has a lot of issues related to logistics. The most critical point on which the further performance of expensive equipment depends is the correct first switching on after delivery. Many people mistakenly believe that it is enough to simply unpack the unit, plug it into a socket and wait for the cold, but rushing to do this can cost you the compressor.
The main reason for the need to pause lies in the physics of the refrigeration circuit. During transportation, especially if the equipment was shaken or tilted, oil from the compressor could flow into the evaporator and condenser piping system. If you turn on the engine right away, it will start running “dry” or trying to push through the hydraulic plug from the oil, which often leads to jamming of the piston group or failure of the valves.
In this article we will analyze all the nuances: from settling time depending on the position during transportation to the influence of outside temperature. You will learn why modern inverter models may require a different approach than the good old "Atlantas", and how not to lose the warranty due to banal carelessness during installation.
Why you can’t turn on the refrigerator right away: the physics of the process
The main component of any refrigerator is compressorwhich operates on the principle of a pump, distilling the refrigerant in a closed circuit. The crankcase of this engine contains a special synthetic or mineral oil necessary to lubricate the rubbing parts and remove heat. In normal operation, the oil is located below, in a special container, and only a small part of it circulates along with freon, managing to return back.
With active shaking during transportation on uneven roads or with a strong tilt of the body (which often happens when skidding into an elevator or a narrow doorway), a violation of the hydraulic balance occurs. Under the influence of inertia and gravity, the oil is pushed into the heat exchangers - evaporator i condenser. This creates a so-called “oil plug” that physically blocks the movement of freon gas.
If you turn on the unit at this moment, the compressor will try to compress the gas, but will encounter resistance from liquid oil. The pressure in the system will increase sharply, which can lead to rupture of gaskets or even destruction of valves. In addition, the lack of lubrication in the motor itself in the first seconds of operation will cause critical wear of the parts.
⚠️ Attention: In modern models with inverter compressors, the risk of breakdown when starting with oil in the circuit is even higher due to the high initial load on the control electronics.
It is also worth considering that when starting a cold compressor abruptly (if transportation was in winter), moisture condensation may occur inside the electrical part of the motor, which can lead to a short circuit. Therefore, time for acclimatization is necessary not only to drain the oil, but also to equalize the temperatures.
Dependence of settling time on the position during transportation
The most important factor determining how long it takes to turn on the refrigerator after transportation is the position in which it was in the truck. Equipment manufacturers and service engineers set clear time limits, ignoring which is equivalent to a violation of operating conditions.
If transportation was carried out strictly in a vertical position, without strong tilts (more than 40 degrees), then the restoration process takes a minimum of time. In this case, the oil could only foam slightly or move to the lower sections of the crankcase, but not leave the compressor. It is enough to let the equipment stand alone for 2-3 hours so that the air microbubbles in the oil disappear and the lubricant settles.
The situation changes dramatically if the refrigerator was transported lying down. This is a common practice to save space in gazelles, but it carries maximum risks. In a horizontal position, oil is guaranteed to flow into the evaporator tubes, sometimes filling them completely. Gravity separation is required for the viscous liquid to flow back into the compressor, which takes significantly longer.
The table below shows recommended time intervals for various transport scenarios:
| Transport position | Minimum settling time | Recommended time (for guarantee) | Risks of early switching on |
|---|---|---|---|
| Vertical (no tilting) | 2 hours | 4 hours | Low (condensation, foam); data-i="77">8 hours |
| At an angle of up to 40 degrees | 4 hours | 6-8 hours | Medium (partial oil loss) |
| Horizontally (lying on your side) | 8 hours | 12-24 hours | High (water hammer, jamming) |
| Horizontal (prolonged shaking) | 12 hours | 24 hours | Critical (oil getting into the cylinder) |
You shouldn’t rely on “maybe”. Even if the refrigerator stood for 4 hours after lying down and seemed to work, residual oil can gradually be released into the system during the first weeks of operation, clogging the capillary tube and reducing the cooling efficiency.
The influence of ambient temperature and winter transportation
The issue of transportation of refrigeration equipment in winter requires special attention. Low temperatures make adjustments to the physical and chemical properties of materials and working fluids. If you brought the refrigerator from the cold, condensation has formed in its insides.
Moisture can settle on the contacts of the electrical circuit, in the insulation of the wires and, most dangerously, inside the compressor. If the power supply is suddenly turned on, water entering live parts will cause a short circuit. In addition, cold oil has increased viscosity and circulates less well, which increases the load on the engine at start-up.
To acclimatize equipment after a winter street, you need to:
- ❄️ Do not immediately bring the refrigerator into a warm room - let it warm up to room temperature in the package or corridor for 3-4 hours.
- 🌡️ After unpacking, keep the unit near the switched on battery (but not close) or just in the room for at least 6-8 hours for the condensation to completely evaporate.
- 🔌 Use only serviceable sockets with grounding, avoiding extension cords that may not withstand the starting current of a cold compressor.
There is a myth that you need to warm up the refrigerator with a hairdryer. Do this absolutely not. Local overheating of the plastic parts of the case or seals can lead to their deformation, and a sharp temperature change is dangerous for glass shelves and internal wiring.
⚠️ Attention: If the refrigerator has been in the cold for more than 2 hours, the minimum time of exposure to heat before turning on increases to 12 hours, regardless of the position at transportation.
It is also worth remembering that the refrigerant (freon) changes its state of aggregation and pressure at low temperatures. The system must come into thermodynamic equilibrium with the room temperature so that sensors and thermostats work correctly immediately after startup.
Features of different types of refrigerants and compressors
The modern market offers many models using different cooling technologies. Settling time may vary depending on which refrigerant is used and what type of compressor is installed.
Traditional refrigerators using R134a or R600a (isobutane) freon require a standard time for oil return. However, isobutane systems often have thinner capillary tubes that are easier to clog with oil emulsion. Therefore, for models marked R600a it is better to adhere to the maximum recommended settling times.
Separate systems No Frost. In them, oil can get not only into the main circuit, but also into the condensate drainage channels and ventilation shafts. Drying these pathways naturally takes longer. If you turn on such a refrigerator early, you may hear gurgling and whistling noises that will not go away on their own.
What is a linear compressor?
Linear compressors (often found in LG) have fewer rubbing parts, but are extremely sensitive to water hammer. Liquid oil entering the compression chamber is fatal for them in 90% of cases, since the piston moves back and forth without the flexibility of a classic crank pair.
Inverter motors, which operate constantly, changing only power, are also sensitive to the quality of the lubrication. They use complex electronic control boards that may not start the engine if pressure or temperature sensors detect anomalies caused by improper distribution of freon and oil.
It is also important to consider the volume of the system. In large two-chamber refrigerators or Side-by-Side models, the volume of oil and the length of the tubes are larger, therefore, the time for gravity drainage of the liquid also increases. A small single-chamber refrigerator will “go away” faster than a giant cabinet.
Step-by-step instructions: correct first switching on
To minimize risks and ensure a long life for your equipment, follow a clear algorithm of actions after delivery. Do not skip a single step, even if it seems to you that you transported the refrigerator “perfectly.”
First, you need to conduct a visual inspection. Make sure there are no dents in the case, especially at the back where the capacitor is located. Check the integrity of the power cord. If everything is in order, install the refrigerator in the prepared place, keeping distances from the walls for ventilation.
Then follows the preparation stage for launch:
- 🧹 Remove the shipping tapes, tape and protective film.
- 🚪 Open the doors and remove all shelves and drawers and packaging foam from the inside.
- 🧼 Wipe the internal surfaces with a damp cloth and a mild detergent to remove factory dust and plastic odors.
- 🔌 Leave the doors open while they sit for ventilation.
After the required time has passed (see the section on the position when transportation), assemble the refrigerator: put the shelves and drawers in place. Close the doors. Now you can connect the power. Do not load food immediately - let the empty refrigerator work for 1-2 hours so that it reaches operating temperature.
☑️ Checklist before turning on
Pay attention to the sounds when you first start it up. A slight rumbling and gurgling sound in the first minutes is normal (freon begins to circulate). But if you hear a loud knock, the clanging of metal on metal or a hum that increases with each second, immediately disconnect the device from the network.
Typical errors and signs of malfunction after startup
Even if all the rules are followed, problems may arise if hidden errors were made during transportation or installation. Often, users do not notice alarm signals until the refrigerator completely stops freezing.
One of the main mistakes is installing the refrigerator on an uneven floor. If the unit is misaligned, oil may accumulate in one corner of the compressor and the pump will trap air when starting. Always use a building level and adjust the legs.
Another common mistake is connecting through a low-quality surge protector or an extension cord with a thin wire. The starting current of the compressor is 3-5 times higher than the operating current. Weak wiring will cause a voltage drop, the motor will not start the first time, and the protection relay will constantly click, trying to turn it on, which will burn the winding.
⚠️ Attention: If after turning on the refrigerator hums, but does not cool, and the side walls remain warm, oil may have leaked into the capillary. A professional pumping of the system by a master is required.
Symptoms of problems arising due to early switching on:
- 🔇 The compressor hums for 5-10 seconds, then a click is heard and it turns off (the thermal relay is activated).
- 🌡️ The refrigerator operates continuously without turning off, but the temperature inside does not drop below +10°C.
- 💧 Ice appears in only one corner of the freezer (“snow coat”).
- 🔥 Strong heating of the compressor housing (it is impossible to hold your hand for more than 2 seconds).
In some cases, if oil has entered the system, a long (up to 24 hours) downtime with the doors open and turned off helps, but this only works at an early stage. If water hammer has already occurred, only repair will help.
Frequently asked questions (FAQ)
Is it possible to transport a refrigerator only in a vertical position?
The ideal option is vertical. However, manufacturers allow a tilt of up to 40 degrees when carrying. Transportation lying down is possible, but requires standing in an upright position for at least 8-12 hours before turning it on.
What should I do if I turned on the refrigerator immediately after transportation?
If little time has passed since turning it on and there are no signs of breakdown (knocking, sparks, burning smell), immediately turn off the device. Let it sit unplugged for at least 6-8 hours. If the refrigerator has already been running for several hours and has stopped freezing, call a technician for diagnostics.
Do you need to remove the compressor bolts before turning it on?
Yes, this is critically important. On the back wall of some models (especially during transportation), shipping bolts or brackets may be installed to secure the compressor suspension springs. They must be removed, otherwise vibration will destroy the tubes or the motor itself.
Does the brand of refrigerator (Indesit, Bosch, LG) affect the waiting time?
The principle of operation is the same for all, but the design is different. For example, refrigerators Liebherr or Bosch often have more complex circulation systems that require careful adherence to rest times. For Chinese brands with compressors Embraco or Secop the rules are the same - gravity doesn’t care about the brand, it needs time.
Is it possible to speed up the process of oil drainage?
No, you cannot artificially speed up the process (by tilting, shaking). The only natural and safe way is time and gravity. Heating the compressor is also prohibited.