After delivery and installation of new household appliances, owners often become impatient: they want to quickly see the result of the work and load the shelves with fresh products. However, haste in this matter can lead to compressor breakdown or temperature disturbances. Understanding the physical processes occurring within the system during the first hours of operation is critical to the longevity of the unit.
The time required to reach set temperatures varies depending on the type of refrigerant, chamber volume and environmental conditions. If you have just unpacked the device, you need to know the exact time frame so as not to spoil the products or damage the equipment. Let's look in detail at what the cooling rate depends on and why this process cannot be rushed.
Modern models running on environmentally friendly freons often require more time to stabilize the pressure in the circuit compared to older analogues. This is due to the peculiarities of the circulation of oil and refrigerant in the system. Ignoring these nuances can lead to the compressor working to wear out, trying to compensate for insufficient heat transfer.
Physics of the process: how the system works in the first hours
Immediately after turning on the compressor, active circulation of the refrigerant begins in the system. Evaporator begins to absorb heat from the internal space chambers, transferring it to a capacitor, usually located on the rear wall or in the base. At this moment, a sharp pressure drop occurs, and the gas turns into a liquid state, and then evaporates again, taking away thermal energy.
The initial start-up is always more energy-intensive and longer, since the system needs to cool not only the air, but also the chamber walls, shelves, plastic containers and the refrigerant itself. Thermal capacity The materials from which the refrigerator is made plays a key role here. Metal elements cool faster, while thick plastic and glass shelves require more time to equalize the temperature.
It is important to understand that temperature sensors can show the desired values after an hour and a half, but this does not mean that thermal stabilization is complete. Air is a poor conductor of heat, and it takes time to distribute the cold evenly throughout the entire volume. If you load products before the end of this stage, you will disrupt the circulation of air flow.
⚠️ Attention: Do not try to speed up the process by setting the minimum temperature on the thermostat immediately after turning it on. This will create an excessive load on the motor-compressor, which has not yet reached operating mode, and can lead to overheating or jamming of the piston group.
The cooling process also depends on how tight the door seals are at the time of start. If the door was opened too long during installation, warm, moist air could get inside. Its drying and cooling will take additional time, since moisture will condense on the evaporator, temporarily reducing the efficiency of heat transfer.
The influence of the type of refrigerant on the speed cooling
One of the main factors that determines how long a new refrigerator takes to get cold is the type of refrigerant used. In modern technology, they are most often found R600a (isobutane) and R134a. These substances have different physical properties, boiling pressure and circulation rate along the circuit.
Refrigerant R600a, which is now used in most European and many Asian models, is explosive, but environmentally friendly. Its quantity in the system is significantly less than that of old freons, and the pressure is lower. This requires more precise dosing and often leads to the fact that the initial cooling is a little slower, but the system is quieter and more economical.
In contrast, R134a has a higher cooling capacity. Units running on this gas can quickly reach negative temperatures in the freezer. However, they tend to be noisier and are sensitive to build quality and circuit tightness. The difference in the time it takes to reach the mode can be from 30 minutes to 2 hours, depending on the volume.
It is worth noting that the type of refrigerant also affects transportation requirements. If the unit has been transported lying down, it will take time for the oil to drain back into the compressor. For R600a, this time may be shorter due to the lower viscosity of the oils used, but it is better to play it safe and let the equipment settle according to the manufacturer's instructions.
| Parameter | R600a (Isobutane) | R134a | Old freons (R12) |
|---|---|---|---|
| Environmental friendliness | High | Average | Low (prohibited) |
| First start time | 4–8 hours | 3–6 hours | 2–4 hours |
| Noise | Low | Average | High |
| Consumption energy | Minimum | Medium | High |
Do not try to independently determine the type of gas or refill the system if it suddenly stops cooling. Sealed circuit Does not require user maintenance, and any intervention requires specialized equipment and qualifications master.
Standard time to reach the mode for different chambers
The time required for complete cooling directly depends on the volume and type of chamber. The freezer and refrigerator compartment have different temperature requirements, so the speed at which they reach their target values differs. Manufacturers usually indicate average values, but reality can make its own adjustments.
The freezer compartment is a zone of extremely low temperatures. To lower the temperature to -18°C and below, the system takes the longest time. Depending on the model, this process takes from 3 to 6 hours. That is why it is recommended not to load the freezer with food immediately, but after a specified time, so as not to disrupt the freezing process.
Basic refrigerator compartment cools faster. Typically, a temperature of +4...+5°C is reached in 2–4 hours. However, to distribute the cold evenly across all shelves, especially in models with the No Frostsystem, an additional fan cycle may be required. In drip-type systems (crying evaporator), it is important to wait for a complete defrost cycle and a new freezing, which takes about a day.
Why do different models have different times?
The difference in time is due to the power of the compressor, the volume of the chambers, the quality of the insulation and the operating algorithms electronics. Inverter models can gain cold more slowly, but they maintain the temperature more accurately, while conventional compressors operate jerkily.
There is the concept of “superfreezing mode,” which forcibly turns on the compressor for continuous operation. Using this function at the first start can reduce the waiting time, but is not recommended by manufacturers unless absolutely necessary, as this is stressful for new equipment.
⚠️ Attention: If after 12 hours of continuous operation the temperature in the chambers has not dropped to operating values, and the compressor does not turn off (or works without interruption in models without an inverter), this may indicate a malfunction, a freon leak, or an assembly defect. In this case, you must contact the service center.
Environmental factors and installation conditions
Do not forget that the refrigerator is a heat pump that transfers heat from the inside to the outside. The effectiveness of this process directly depends on the temperature in the room where the equipment is installed. The hotter the room, the more difficult it is for the system to remove heat and the longer it will take to gain cold.
In the summer, when the temperature in the kitchen reaches +25...+30°C, the first start-up time can increase by 30–50%. Heat exchanger (the grille at the back or on the sides) should have free air access. If the unit is built into a niche or moved close to the wall without a gap, overheating will result in the desired temperature not being reached at all.
Air humidity also plays a role. In very humid rooms, condensation or ice may form more intensively on cold elements, which temporarily reduces the efficiency of heat transfer. In addition, direct sunlight on the body heats the walls, causing the compressor to work harder.
☑️ Correct installation of the refrigerator
Drafts and heating devices operating nearby also affect the operation of the thermostat. If the temperature sensor is located near a heat source, it will give false readings, causing the compressor to idle or, conversely, turn off prematurely.
Rules for first loading with food
One of the most common mistakes is loading the refrigerator with food immediately after turning it on. This is categorically wrong. Warm food will become an additional source of heat, and the system will have to work at its maximum capacity to cool not only the air, but also the contents of the shelves.
You should load food only after the refrigerator has been empty for the prescribed time (usually 4–6 hours, or better yet, a day). Products should be at room temperature. You cannot place hot or warm foods in a new refrigerator - this will disrupt the temperature regime and can lead to spoilage of other products if they are already inside.
When loading for the first time, do not overcrowd the chambers. Leave space for air circulation, especially in models with No Frost. Cold air should freely wash all products. If you fill the shelves to capacity immediately, there may be “thermal pockets” in the center where the temperature will not be low enough.
Distribute the products evenly. It is better to place heavy and bulky items on the lower shelves, and light and perishable items – higher up or in the freshness zone. This will help the system quickly stabilize the temperature throughout the entire volume.
Table: Approximate cooling time
For the convenience of users, we have collected average data on the time to reach the mode for various types of refrigerators. Remember that these figures are indicative and may differ depending on the specific model and operating conditions.
| Refrigerator type | Volume (liters) | Time to +5°C (cold) | Time to -18°C (frost.) |
|---|---|---|---|
| Small (up to 200 l) | 150 | 2– |