This module generates the on or off state for the control of a fan within a zone control application. It looks at the heating, cooling, and damper command values fed back from the output controllers and the occupancy status to determine whether the fan is required to operate. The heating or cooling command must exceed the fan on threshold while the damper command must exceed the minimum damper position to turn the fan on. The module can be configured to operate the fan continuously during occupied and bypass or cycle based on demand.
This module can be used to provide the on command to single speed fans, three speed fans, or proportional fans. It can also be set up to continue to operate the fan for a period of time following the call for heat by setting the Heating Purge Duration parameter to a positive value.
You can view and modify the modules in this group’s logic.