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Why is there a bypass flap in our KWL units? To direct the cooler and filtered fresh air past the cross-flow heat exchanger directly into your premises.
When is the bypass active? The bypass opens: If the user-defined period of time fits, the fresh air limitation has been exceeded, if the set room temperature is exceeded and if the drawn-in fresh air is cooler than the room temperature.
When does the bypass valve close again? The bypass is only closed when the outdoor air restriction or room set point temperature is not reached.
Why does the bypass not close even though the outdoor temperature is higher than your room temperature? Since your premises are colder than the fresh outside air drawn in, condensation increases. This is done on the wrong side of the device, so that water will escape from your KWL and damage and mould may occur.
When the bypass is activated, I get too warm? If the outside air temperatures are too warm, we recommend that the KWL unit adjusts the reduced range (fan stage 1). This means that they have filtered clean air and a controlled air exchange is guaranteed compared to an open window, for example.
How does passive fresh air cooling work? Some of our KWL (200,300,500) devices have this additional function. Although the room temperature is cooler than the outside temperature, the bypass damper will close despite increased condensation. However, they must also loosen a plug in the KWL unit to ensure that the condensate drains off.
What is the meaning of the "offset" supply air temperature? This function is active when the supplementary heating is switched on. The set "Offset" temperature is added to your room set point temperature, so that the bypass damper opens only after reaching the temperature sum. This avoids that the fresh air is heated unnecessarily.



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