period four

Fan Modulation

notes

The system static pressure controller senses this higher pressure and sends a signal to the supply fan to reduce capacity. Modulating the fan capacity results in a new fan performance curve and the system balances at an operating point (B) along the fan modulation curve, bringing the system static pressure back down to the set point.

Fan Modulation Methods

Discharge dampers

Inlet vanes

Fan-speed control

Variable-pitch blade control

Figure 80

Fan Modulation Methods

The four methods commonly used to modulate fan capacity are: discharge dampers, inlet vanes, fan-speed control, and variable-pitch blade control. We will examine these now.

Discharge Dampers

supply

fan

discharge dampers

Figure 81

Discharge dampers match the static pressure supplied by the fan with the static pressure required by the system. They accomplish this by adding static- pressure loss to the system a little bit downstream of the fan.

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TRG-TRC014-EN

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Trane TRG-TRC014-EN manual Fan Modulation Methods, Discharge Dampers

TRG-TRC014-EN specifications

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