Petra Chillers Offering As a leading manufacturer of HVAC equipment, Petra offers a wide spectrum of chillers that suit many applications and design requirements. Petra offers a range from 5-1500 tons of chiller capacity with the following designs: Air cooled water chillers Water Cooled water chillers VSD compressor Air- and water-cooled chillers Explosion proof chillers Explosion Hazardous Location Air Cooled Chiller Air Cooled Chiller VSD Screw Series Explosion Hazardous Location Air Cooled Chiller Optional features and accessories (not limited to): Different compressors: Screw or scroll Multiple control type of compressors: on-off, variable speed drive (VSD) or digital scroll Different refrigerant selection R-410a or R-134a Built in pumping package Built in free cooling " Economizer " fluid coil Low ambient control Low sound version and kits High efficiency versions Ducted Indoor air-cooled chillers with centrifugal fans Custom solutions including new low GWP refrigerant designs (refer to factory) Air Cooled Chiller with Scroll Compressors Air Cooled Chiller with Scroll Compressors Air Cooled Residential Chiller with VSD Scroll Compressors PETRA OFFERS A WIDE RANGE OF HVAC PRODUCTS TO MEET DIFFERENT SPECIFICATIONS AND REQUIREMENTS " These marks/certifications apply to specific ranges of Petra products "http://www.petra-eng.com