Filter/separator integral to Series HPRplus removes bulk liquid and particles down to 3 micron; optional cold coalescing filter captures oil aerosols as fine as 0.008 ppm. Refrigeration system maintains 38°F dew point using environmentally friendly R404a refrigerant; low-noise, hermetic scroll compressor; and intelligent heat load-sensing EDBV control system. Cabinet-mounted filters save wall space and installation costs. Energy-efficient system communicates via RS232 and supports Web monitoring.