Control settings

This section describes making the following sensor-related settings:
  • Method for adjusting the supply air temperature

  • Method for adjusting the humidity control

    When humidity control is used, the ventilation unit controls the ventilation based on the relative humidity of the indoor air. If more than one humidity sensor is used, the fan speed is adjusted using the highest sensor value.

  • Humidity limit

    The humidity limit is the limit value for the relative humidity of air. Once this limit is exceeded, the ventilation unit will boost the ventilation.

  • Carbon dioxide limit

    The carbon dioxide limit is the limit value for the carbon dioxide level. Once this limit is exceeded, the ventilation unit will boost the ventilation. If more than one carbon dioxide sensor is used, the fan speed is adjusted using the highest sensor value. The carbon dioxide sensor is optional.

    Note:

    The indicative maximum carbon dioxide level in the indoor air is 900 ppm.

    Other values relating to the carbon dioxide level of the air:
    • 1200 ppm — The limit value for satisfactory indoor air
    • 700 ppm — The limit value for excellent indoor air

    Source: Indoor climate classification 2018

To make sensor-related settings:

  1. Select Expert settings.
  2. Go to the Control settings area.
  3. Select the method of use of the external temperature sensor from the Outdoor temperature sensor control menu. The options are:

    • Not in use — The duct radiator is located in the outdoor air duct, no external sensor has been connected.

    • Outdoor air duct radiator control — The duct radiator and the external sensor are located in the outdoor air duct.

    • Air heating — Not used in the controlling of the duct radiator.

    • Supply air duct radiator control — The duct radiator and the external sensor are located in the supply air duct.

  4. Select the method for adjusting the supply air temperature from the Temperature control method menu. The options are:
    • Supply air — The Supply air setting uses the post-heating resistor when the temperature of the air coming through the heat recovery cell is lower than the set supply air temperature. The heat recovery cell is bypassed when the outdoor temperature differs from the set supply air temperature by two degrees and the outdoor temperature is cooler than the extract air temperature.
    • Extract air — The Extract air setting changes the target value of the supply air setting automatically based on the temperature of the air extracted from the apartment (max. 10°C).
      • If the extract air temperature is lower than the set supply air temperature, the setting increases the target value of the supply air setting (max. 10°C).
      • If the extract air temperature is higher than the set supply air temperature, the setting reduces the target value of the supply air setting (max. 10°C).
    • Cooling — When the Cooling setting is used, the ventilation unit operates as when the Extract air setting is used, but it also boosts the ventilation where required until the mode is switched.
  5. Select the method for adjusting the humidity control from the Humidity sensor menu. The options are:
    • Automatic (factory setting ) — The Automatic setting should be used for normal apartment ventilation. If the automatic humidity control is used, the ventilation unit determines the normal relative humidity of air level and saves it in the memory. The unit restores this relative humidity of air level e.g. after showering. The normal relative humidity of air level depends on the time of year. If the Automatic setting is used, no humidity limit needs to be set.
      Note: When the ventilation unit is started with the automatic humidity control method turned on, the process of determining the relative humidity of air level will take 3–10 hours. During this time, the humidity control is not in operation.
    • Manual — Use the Manual setting in premises where the relative humidity of the indoor air remains stable throughout the year. This setting should be used, for example, in indoor swimming facilities. The humidity value can be set between 1 – 99 %RH. The ventilation unit attempts to maintain the relative humidity of indoor air at the set level. If the Manual setting is used, a humidity level must also be configured.
  6. If you use the Manual setting, set the humidity level as a percentage by using the blue Humidity limit slider.
  7. Use the blue CO2 limit slider to set the carbon dioxide limit as parts per million (ppm). The value can be set between 500–2000 ppm. The factory setting is 900 ppm.
The sensor settings are now complete.