The VA series of speed controllers offers a comparatively low cost option for varying the flow, power consumption and sound levels of single phase fans with a current rating of up to 10 amps. Speed control ranges from 100% down to approximately 30%.
Notes
VA speed controllers are recommended for external rotor motor fans to ensure adequate cooling under speed control conditions. They should not be used to speed control fans with conventional foot or flange mount single phase motors other than models designated as being speed controllable. Refer to the wiring diagram packaged with the controller for specific instructions relating to installation. PSC (Permanent Split Capacitor) motors can be installed with three wire configuration to help minimise motor hum.
When more than one fan is to be controlled, the fans should be of the same type and capacity with the combined full load current not exceeding 85% of the controller FLC rating.