Humidity control delayed after fan start

On initial start of the air handling unit all control functions assume normal temperature control before the humidity control is enabled.

The humidity control will be delayed after fan start (input "FanBeltIn" must be true), e.g. 5 minutes, adjustable by parameter SYS-03.


If the input "FanBeltIn" does not detect an airflow during normal operation, the module will be blocked immediately. This feature reduces the risk of wet ducts on initial start-up and fan belt alarms.


Note: If the outside air temperature is:


Description

Default value

SYS-03: delay after fan start

300 sec

OAT-01: high limit for humidification

14 °C

OAT-02: low limit for de-humidification

15 °C