Description
If the combustion air fan is actuated via the HMI rather than directly via the safety control system, the external release must be TRUE so that the fan can start.
If the contact is set to FALSE during operation, the combustion air fan is immediately stopped.
The release contact is only used when the combustion air fan is controlled via a HMI signal. This contact cannot be used if the combustion air fan is being controlled via the FSC.