Relay settings

This section describes the settings of the ventilation unit’s 24 V relay. Only one operating mode can be selected at a time.

To set the operating mode of the ventilation unit relay:

  1. Select Expert settings.
  2. The settings of the relay are described in the Relay settings area.
  3. Select the operating mode of the 24 V ventilation unit relay. The options are:

    • Maintenance reminder — When the unit’s maintenance reminder is activated, the relay changes its mode. This change of mode can be read by the building automation system, for example.

    • Error message — If there is an error in the ventilation unit, the relay changes its mode. This change of mode can be read by the building automation system, for example. The error is also recorded in the error log.

    • Error message and maintenance reminder — If the unit’s maintenance reminder is activated or if there is an error in the ventilation unit or the unit has been turned off, the relay changes its mode. This change of mode can be read by the building automation system, for example. The maintenance reminder notifies the user of the need for maintenance every four months (factory setting). For more information, see Maintenance.

    • Emergency stop — If the unit’s emergency stop is activated, the relay changes its mode. The emergency stop is usually activated by an external signal received through the digital input. The emergency stop information can be sent to the building automation system, for example.

    • Position of the bypass damper — The relay indicates the position of the bypass damper. The change in the damper position is visible e.g. in the house automation system. There are two positions:
      • If the ends of the relay are open, the bypass damper is open and the air flow is directed past the heat recovery cell (known as the summer position).
      • If the ends of the relay are closed, the bypass damper is closed and the air flow passes through the heat recovery cell (known as the winter position).

    • Duct radiator control — This setting is used in special situations, in which a duct radiator has been installed in the ventilation duct. The relay can be used to control devices connected to the duct radiator, such as the pump, solenoid valve etc. For more information, see Duct radiator control.

      Note:

      The relay’s voltage is only 24 V, so the information cannot be directly used to control the 230 VAC feed and e.g. a contactor is needed in between.

    • None — The relay function is not in use.

    • Air heating — This setting is used in the warm-air heater. Use the relay to control the liquid radiator actuator of the warm-air heater.

    • On/off status — The relay will change the mode in error situations or when the unit has stopped.

  4. The operating mode of the 24 V relay of the ventilation unit is now set.