Buying new household appliances or moving is always an exciting moment when you want to start the unit as soon as possible and check its operation. However, experienced repairmen and design engineers unanimously say: you absolutely cannot rush to connect to the electrical network. Ignoring this rule can lead to fatal consequences for compressor and the entire cooling system.
There are several physical reasons why a delay is required before the first start, and all of them are related to the internal structure of the refrigeration circuit. If you neglect technological breaks, you risk getting expensive repairs on the very first day of operation. Let's take a closer look at what exactly happens inside the unit during this period of rest.
The main blow in case of incorrect starting takes the motor, which is the heart of the system. Modern models use complex control schemes, but the laws of physics remain the same for all devices, be it old Zil or premium Liebherr. Understanding these processes will help you avoid common mistakes.
Physics of the process: what happens inside the compressor
Inside compressor there is not only an electric motor, but also a special refrigeration oil necessary to lubricate the rubbing parts. In operating condition, this oil circulates through the system along with the refrigerant, but when stopped and transported, it flows into the lower part of the housing, often entering the refrigerant circulation circuit.
If you turn on the unit immediately, the oil will not have time to return to the compressor crankcase. This will lead to the mechanism running dry, which causes rapid wear of the piston group or rotor. In addition, the entry of liquid oil into capillary tube can cause water hammer, which will physically destroy the thin elements of the system.
⚠️ Attention: Attempting to start the compressor without oil draining can lead to jamming of the pistons. In most cases, this cannot be repaired and requires a complete replacement of the motor.
It is also important to consider the condition coolant. With a sharp start without first stabilizing the pressure in the system, local overheating zones may appear. Modern inverter motors, such as Digital Inverter, are especially sensitive to the quality of lubrication in the first seconds of operation.
The influence of transportation on the condition of equipment
Transporting a refrigerator is always stressful for its internal components. Even during careful transportation, vibrations and shaking occur in the truck bed, which disrupt the calm state of the fluids inside the system. That is why the question of why you can’t immediately turn on the refrigerator is so acute after delivery.
During movement, intensive mixing of oil and refrigerant occurs, as well as displacement of heavy components. Spring suspension The compressor, which dampens vibrations during operation, can be temporarily displaced or clamped. It takes time to return to its normal position under the influence of gravity.
- 🚚 Vertical transportation causes minimal disruption, but the oil can still partially go into the evaporator circuit.
- 📦 The horizontal position dramatically increases the risk of oil getting into the discharge compressor tube.
- 🔩 A tilt of more than 40 degrees during loading can lead to the springs of the internal motor suspension being torn off.
The situation is especially critical if the refrigerator was transported lying down. In this case, the oil is guaranteed to flow into the tubes, from where it is difficult to expel it without long-term settling. The minimum settling time after horizontal transportation is 12 hours, or better yet, a full day.
Time intervals: how long you need to wait
The time required to stabilize internal processes directly depends on the conditions in which the unit was before turning on. There is no single figure for all cases, so it is important to focus on a specific situation.
If the refrigerator was just standing in a warm room and it was moved to another place, 2-4 hours is enough. However, if the equipment has been exposed to low temperatures or prolonged shaking, the time frame will increase. For inverter compressors the requirements may be stricter due to the high precision of the gaps in the mechanism.
| Transportation conditions | Air temperature | Recommended time settling |
|---|---|---|
| Vertical, no shaking | Above +15°C | 2-4 hours |
| Vertical, strong vibration | Above +15°C | 4-6 hours |
| Horizontal (lying) | Any | 12-24 hours |
| Transportation in winter (frost) | Below 0°C | 24 hours + warm-up |
It is worth noting that manufacturers often indicate minimum periods in the instructions, but service center technicians recommend adding a margin of 30-50% to this time. This is especially true for models with a system No Frostwhere the circulation of air and oil is more intense.
Risks of starting at low temperatures
The situation when the refrigerator was delivered in winter deserves special attention. Many buyers mistakenly believe that cold is good for equipment and try to start it immediately after bringing it into the apartment. This is a gross mistake that can cost the life of the compressor compressor.
The problem lies in the properties of the refrigeration oil. At low temperatures it thickens, becoming viscous, almost like grease. If you turn on the engine, the thickened oil will not be able to effectively lubricate the parts, which will lead to operation in dry friction mode. In addition, condensation may form in the system, which, when freezing, turns into ice plugs.
An attempt to start a cold unit is fraught with the following consequences:
- ❄️ Freezing of moisture in capillary tube, which blocks the circulation of freon.
- ⚙️ Damage to the compressor valves due to increased oil viscosity.
- 💧 Formation of condensation on the electrical contacts, which leads to a short circuit.
Before thinking about turning on, A refrigerator brought in from the cold should warm up to room temperature. Only after this can you expect the oil to drain and moisture to evaporate. Usually this process takes at least a day.
⚠️ Attention: Do not try to speed up the heating of the refrigerator using heaters or hair dryers. A sharp temperature change can deform plastic elements and damage the varnish coating of the tubes.
Check before first connection
After the required time has passed, you cannot simply plug in the retail plug. Careful visual and technical preparation is required. This will help identify shipping damage that may have gone unnoticed.
First, inspect the case for dents and chips. Pay special attention to the rear wall where the condenser and compressor are located. Make sure that copper tubes are not pinched and do not have traces of oil, which may indicate a freon leak.
☑️ Pre-start check
Next you need to install the refrigerator on a flat surface. Use a building level or simply evaluate the position of the doors. If the unit is positioned crookedly, the doors may not close tightly, which will lead to constant operation of the compressor and its overheating. Height adjustment is carried out using the front support legs.
It is also worth conducting an audit inside the cameras. Remove all packaging materials, tape and films. Wipe the shelves with a damp cloth. Make sure the lamps and temperature sensors are not damaged. Only after these procedures can you proceed with the electrical connection.
What to do if the refrigerator makes a strange sound after turning on?
A slight gurgling or hissing sound is normal, as the refrigerant begins to circulate. However, a metallic clang or hum that turns into vibration requires immediate shutdown.
Frequent errors when starting up for the first time
Even knowing the theory, users often make practical mistakes. One of the most common is loading products immediately after switching on. An empty refrigerator must operate for at least 2-3 hours to reach operating temperature conditions.
If you fill the chambers with warm food right away, thermostat the compressor will be kept on for a long time, trying to cool a large volume. This creates excess load on the motor, which has not yet “started up”. As a result, the resource of the unit is reduced.
Another mistake is connecting through an extension cord or a weak surge protector. The refrigerator requires a stable voltage and a separate grounded outlet. The use of tees or cheap extension cords can lead to a voltage drop when starting the motor, which will trigger the protection or overheat the contacts.
- 🔌 Using extension cords with a wire cross-section of less than 1.5 mm².
- 🍗 Loading the chambers with products until the operating temperature is reached.
- 🌡️ Installing the unit close to the wall, which interferes with the ventilation of the condenser.
Remember that correct installation and first start-up are the foundation for the long service of your equipment. Following simple operating rules will allow you to avoid costly repairs in the future.
Is it possible to transport a refrigerator lying down if there is no other option?
Transportation in a horizontal position is undesirable, but is possible if precautions are taken. Be sure to pack the unit, secure the doors with tape and transport it very carefully. After delivery, the settling time should be increased to 24 hours so that the oil completely drains into the compressor.
What to do if the refrigerator was turned on immediately after transportation?
If little time has passed since it was turned on (less than 10-15 minutes), immediately turn it off and let it stand for several hours. If the unit has been running for a long time and is not cooling, there may be a water hammer or a blockage in the system. In this case, you need to call a technician for diagnostics.
Do you need to defrost a new refrigerator before use?
New refrigerators, as a rule, do not require defrosting, since they are new. However, it is imperative to wash the internal chambers with warm water and a mild detergent to remove factory dust and plastic odors. After washing, the doors should be opened until completely dry.
Why does the refrigerator hum after installation?
A slight hum is the normal operation of the compressor. If the hum is strong, check whether the tubes are touching each other or the housing from behind. Also make sure that the refrigerator is level and does not wobble. Sometimes vibration is transmitted to the floor if the legs are not adjusted.