The 4841 Controller, ECM, 0-10 VDC TO PWM is a compact, microprocessor based motor speed controller designed to convert a 0-10 Vdc signal to a 0-100% PWM signal to control one or two variable speed, ECM pumps. The controller is powered by a 24VAC power supply (field supplied) and is housed in NEMA 6P enclosure. The controller is intended to be used with water-source VRF systems that output a 0-10Vdc signal to control a Grundfos UPM XL 25-124 pump with a standard PWM profile.