Climate class & ambient temperature – Hints and Tips for fridge & freezer


Prior to the purchase of refrigerators and freezers you should take into account the climate class. Because the climate class determines in which ambient temperature, the cooling or freezing appliance is most effective. There are four climatic classes:

  1. Climate class SN (expanded or sub-normal) work best in an environment temperature between 10 and 32 ° C.
  2. Climate class N (normal) work best in temperatures between 16 and 32 ° C.
  3. Climate class ST (subtropics) work perfectly in an environment temperature between 18 and 38 ° C.
  4. Climate class T (tropical) are designed for ambient temperatures between 18 and 43 ° C.

The cooling or freezing appliance having a temperature sensor in the thermostat that has been set by the manufacturer with in-and off points for specific temperatures in the refrigerator. When a certain temperature is exceeded (the switch-on) in the refrigerator, the compressor automatically becomes “running” and brought the refrigerator or freezer is cooled down again to “operating temperature”. The optimal temperature is always reached within a certain time constant. If the temperature is reached, the compressor switches off automatically. This process takes place at regular intervals. Thus, the cooling device operates when it is in the optimum ambient temperature.

climate class determines in which ambient temperature

Refrigeration or freezers to climate class SN need a continuous “heat” to keep the refrigerator or freezer unit “thinks” it is warmer. In this way it is possible to develop devices and SN ambient temperature of at least 10 ° C. This is achieved by a small heater installed at the thermostat.

What happens when the refrigerator or freezer appliance is installed in a cold room? The ambient temperature always acts on the fridge. In a colder environment than the climate class indicates the refrigerator is not enough “heat”, which would put the cooling process in motion. The “non-cooling periods” expand. Jumps to the compressor, it works just as long as it would otherwise be working. This eventually leads to the fact that the temperature in the refrigerator. So it’s warmer in the refrigerator because the compressor would have to work longer to reach the optimum temperature again, it does not. In a freezer for example, then thaws the frozen food. If you try to counteract this event by adjusting the controller, you can achieve a partial success. The temperature then decreases with rising energy consumption. In a refrigerator this can also cause it to freeze in the cold room of the refrigerator. But to a “cold” location of the refrigerator or freezer will sooner or later cause the lubricant in the compressor changes its properties and thus the refrigerator or freezer is total damage (loss of cooling capacity).

It is therefore extremely important that refrigerators and freezers are always placed in the ambient temperature of its climate rating. For the climate classes SN, N, ST and T is the kitchen in general. Spaces, such as basements or unheated rooms and floors exposed to frost usually are not included.

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