Designed for air conditioning service, they also serve many fluidics, refrigeration, oven and dryer applications. For air and non-combustible compatible gases, series 1900 switches have set points from 0.07 to 20 in. W.C. Set point adjustment is easy with range screw located inside conduit enclosure.
Internal location helps prevent tampering.
Prevents-duct blowout by shutting down blower when excess pressure occurs. Won't allow start-up again until condition is corrected and switch is manually reset. Must be manually reset after pressure drops below set point. To order, change model to 1900 and add MR suffix after range number. Not U.L., C.S.A. or F.M. Iisted.