Trane TRG-TRC013-EN manual E F 64 x”4 R8 j78 pl e F 82A98 u- j7

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PAs the fan airflow increases, the nature of the fan’s input power curves causes the fan’s power requirement to also increase, possibly overloading the motor.

R“riding the fan curve,” discharge dampers, inlet vanes, fan-speed control, and variable-pitch blade control

Sinlet vanes

DC By adjusting (swiveling) the pitch of the fan blades.

DDHere are five possible causes:

1 Not enough straight duct at the fan inlet or outlet to ensure a uniform velocity profile

2 A diffuser that connects the fan to the duct system, an elbow, a branch, turning vanes, or a damper located too close to the fan outlet

3 An elbow, turning vanes, air straightener, or other obstruction located too close to the fan inlet

4 Preswirling the air prior to it entering the fan wheel 5 Use of an inlet plenum or cabinet

DE KWMK b	(also known as KbRaKO b	), titled
“Laboratory Methods of Testing Fans for Rating”

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