Question

If the digital inputs for a supply-air fan control application indicate that the supply-air fan should be on, the controller compares the measured ________ to the set point; if this reading is lower than the setpoint, the supply-air fan speed must be increased.

Answer 1

If the digital inputs for a supply-air fan control application show that the supply-air fan should be ON, the controller compares the measured static air pressure to the set point.

The operation of a supply-air fan control.

Basically, the controller of a supply-air fan control application is designed and developed to compare the measured static air pressure to the set point when its digital inputs indicate that the supply-air fan should be ON.

By design and configuration, if the measurement of the static air pressure is lower than the set point, the supply-air fan speed must be increased by an engineer accordingly.

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