ABB FBVi-2U4-4T - Fan Control

FBVi-2U4-4T | FBVI-2U4-4T Contr
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Subject to change without notice
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70
MAN0148 rev 5
FAN CONTROL
Parallel Variable Fan Speed Option
The variable fan speed will be controlled by modulating AO 15 (default 0
…
10 Vdc). The fan will run in
heating mode only. As more heating is required, the fan speed will increase. As the heating demand
increases, the variable fan command will increase from minFanSpeed (A237) setpoint to the
maxFanSpeed (A238) setpoint.
Series Variable Fan Speed Option
The variable fan speed will be controlled by modulating AO 15 (default 0
…
10 Vdc). In deadband mode,
the fan will run at a slower speed. As the heating demand increases, the variable fan command will
increase from minFanSpeed (A237) to the maxFanSpeed (A238). As the cooling demand increases, the
variable fan command will increase from minFanSpeed (A237) to maxFanSpeed (A238).