When configuring the relays on a CCU, the operation of the fan is determined by the fan setting.
In the example below, Relay 3 is set to 'Fan Enable'. 'Fan Enable' tells the fan to run constantly during occupied hours. It will also run the fan during a heat or cool call during unoccupied:
Alternatively, using the drop down to set the control to Fan Stage 1, the fan will only run when there is a heat call or a cool call:
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