Switching contact (potential-free)

Functions which can be switched with the potential-free contact on the main circuit board. For setting → Switching contact parameter under Switching contact function.

● Alarm
● Filter change
● Operating display
● Supplementary heating*
● Pre-heating *
● Shutter

Alarm function: Switching contact open during operation. In case of malfunction, the contact remains closed until acknowledged.

Filter change function: The switching contact closes if a filter change is imminent.

Operating display function: If fans are switched to active (in ventilation level HPV, RV, NV or IV), the switching contact closes. The contact remains open when switching off or in case of malfunction.

* ATTENTION with pre-heating/supplementary heating: Incorrect installation will result in unit damage.

If external pre-heating or external supplementary heating is selected, the power supply for the component should be switched via an external relay.

Supplementary heating function: The switching contact switches a downstream heat register on/off. The setting function of the room setpoint temperature is activated in the temperature short code menu (→Main menus).

The supplementary heat register’s supply voltage is led via an external relay and not via the contact on the basic circuit board. Switches on automatically when the temperature falls below the room setpoint temperature. Switches off automatically when the actual room temperature exceeds the room setpoint temperature.

The actual room temperature is determined using the selected temperature sensor → Parameters Room sensor configuration.

Pre-heating function: The switching contact switches an upstream external pre-heating unit (electric/hydraulic) on/off. The pre-heating keeps the unit free of frost.

Switches on automatically if the temperature falls below the minimum air inlet temperature (factory setting) + T air inlet offset heating.

Switches off automatically if the minimum air inlet temperature (factory setting) + T air inlet offset heating is exceeded.

Shutter function: The switching contact closes as soon as the fans switch on. If there is a speed, the contact opens. This also happens during pauses when operating with humidity protection.