Programmable input

The programmable input compensates for underpressure caused by, for example, the use of a central vacuum system or cooker hood. When the building automation system detects that the appliance has started, it sends a signal to the programmable digital input of the ventilation unit. The ventilation unit then adjusts the air flow according to the set values.
NOTE:
The ventilation unit has two digital inputs (Digital input 1 and Digital input 2). You can select the programmable input to be activated from either digital input, but only one programmable input profile is available, so the settings are the same for both.

To program the input:

  1. Select Programmable input, 0 V / 24 V, for one digital input. See section Input settings.
  2. Set the duration of the programmable input in hours and minutes.
  3. CFi: Set the air flows of the programmable input’s supply air fan and extract air fan (l/s or m3/h).

    MV: Set the supply and extract air fan output as a percentage of the maximum output for the programmable input.

    NOTE:
    When compensating for differences in pressure, the difference between the supply and extract air flows should not exceed 30%.
    Figure 1. Programmable input CFi/MV
  4. Set the target supply air temperature for the programmable input. The temperature range is +5°C – +25°C. The factory setting is 15°C.

    In addition to the aforementioned expert settings, the MyVallox MyVallox Home/Cloud user interface can be used to enable or disable a timer.