Vostermans Varifan Variable Speed Drive 20 Amp w/ Manual Override (VSD-1MC-20)

The VSD-1MC-20 Keeps a Manual Dial for a Reason Automatic control is only useful while the controller feeding it is alive. This drive takes a 0-10V or 4-20 mA signal from a climate system. A toggle on the faceplate hands control back to a manual speed dial whenever you want it. The load rating is 20 amps. Minimum speed is set internally, and the drive can hold that floor continuously rather than dropping the fan to a stop. Fitting a 20 Amp Fan Speed Controller in a Wet Room The enclosure is the part people underrate. It is sealed against light, moisture and dust, which is what a controller mounted in a grow room or a barn actually faces. A radio interference filter is built in, so it is less likely to put noise onto sensor lines running nearby. The unit is 12.3 by 8 by 6.3 inches and weighs 4.0 lbs. Give it wall space rather than hanging it off a conduit. Warranty is two years, shorter than most fans it will drive. Key Features 20 Amp Rating: Drives a large fan or several smaller ones on one circuit. 0-10V or 4-20 mA Input: Accepts either signal type from a climate controller. Manual Override Toggle: Switch to the faceplate dial when automation is down. Internal Minimum Speed: Set a floor and hold it continuously, no stopping. Sealed Enclosure: Rated against light, moisture and dust ingress. Radio Interference Filter: Keeps electrical noise off nearby sensor wiring. Extended Supply Voltage Range: Tolerates a wider input than a basic dimmer. 2-Year Warranty: Covered for two years from Vostermans. Technical Specifications Specification Value Maximum Load 20 A Control Input 0-10V or 4-20 mA Manual Override Toggle switch plus faceplate speed dial Minimum Speed Internally adjustable, continuous operation Enclosure Sealed against light, moisture and dust Interference Filter Built in Dimensions 12.3 x 8 x 6.3 in Weight 4.0 lbs Part Number VFVSD-1MC-20 Warranty 2 years