Trane TRG-TRC013-EN manual Input Power, Fan Surge

g

Input Power
0.5 hp	1 hp	2 hp	3 hp
[0.37 kW]	[0.75 kW]	[1.5 kW]	[2.2 kW]
static pressure			input power
		airflow	g EC

Px”p““2

curves can be calculated and plotted to represent the fan’s power consumption at each operating condition.

Fan Surge

high

pressure

fan

low pressure

g ED

When most fans approach the blocked-tight static-pressure condition,

instability is encountered. This condition is known as .

Surge occurs when the quantity of air being moved by the fan falls below the amount necessary to sustain the existing static-pressure difference between the inlet and outlet sides of the fan. When this occurs, the pressurized air flows backward through the fan wheel, instantaneously reducing the pressure at the fan outlet. This surge of air enables the fan to re-establish the proper direction of airflow. The resulting fluctuation in airflow and static pressure within the fan and ductwork can result in excessive noise, vibration, and possibly damage to the fan.

7: caQ3caM6793O[