Air Handling seq. - user manual
Fig 48_ [Supply and return fans - Type of supply fans]
If F00=PID, the fan modulates its speed with PID control (parameters Fr3-Fr6) according to a setpoint Fr2
and the value of a control probe, dened by F01 from among the return temperature (F01=REt), supply
temperature (F01=SUP) and air pressure “bAR – Air Pressure” (F01=bAR) probes.
The control type is dened in Fr1 from among the following possibilities:
Fr1=INV. Inverse control, i.e. heating.
Fr1=DIR. Direct control, i.e. cooling.
Fr1=CO1. Direct or inverse control according to the operating mode: summer/winter. Direct in summer,
inverse in winter.
Fr1=CO2. Direct or inverse control according to the operating mode: summer/winter. Inverse in summer,
direct in winter.
The outputs indicated in the previous point are used to control the fan.
Note that the fan is never stopped if temperature or humidity control action is requested. In this case the
fan is set to its minimum speed.
In case of a reference probe failure, the fan is forced to its maximum speed.
Return fan output
As with the supply fan, the outputs used to control the return fan are the digital outputs “REF - Return Fan”, “RFL - REt.
Fan Low Sp.”, “RFH - REt. Fan High Sp” and the analog output “REF - Return Fan”.
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