System 450™ is a family of modular, digital electronic controls, easy to assemble and set up for reliable temperature, pressure, and humidity control for a wide variety of HVAC/R, commercial process, and industrial process applications. Create application-specific systems to control temperature, pressure, humidity, or all three at once, with only a small suite of models. Humidity control capabilities include:
W42AA humidistats control humidifying and/or dehumidifying equipment. The three-wire device has single-pole, double-throw, snap-acting contacts. Typical applications include exhaust fan operation in electrically heated homes, and humidity control in fruit storage rooms, curing rooms and hospitals.