GF83.30-P-2125-01Q Air Humidity Sensor, Function

GF83.30-P-2125-01Q Air Humidity Sensor, Function
- except CODE (581) Comfort automatic air conditioning [models 209.3/4 up to 28.6.06]


The air humidity sensor (B31/2) measures the air humidity of the drawn in outside air to regulate air dehumidification.
The value of the air humidity sensor (B31/2) is passed on to the AAC [KLA] control and operating unit (N22) via the AC bus and is used to regulate the refrigerant compressor (A9) as well as the interior temperature.
As a result, air dehumidification can be reduced at low humidity, which facilitates a more pleasant climate in the vehicle interio The air around the evaporator is no longer cooled down to approx. 3 �C, as previously, in order to then be heated back up to the desired temperature (Reheat mode).

Reheat mode only takes place, if the reheat-associated air dehumidification effect is required to keep the windows condensation-free when humidity is high. Three different regulation zones, which are dependent on the relative humidity, are defined as shown in the following tables.

The air humidity sensor (B31/2) operates in the following value ranges:
^ Relative humidity of intake air from 0 to 100 %
^ Temperature of intake air from -40 °C up to +85 °C
^ Dew point temperature from -40 °C to +85 °C