Combination air cooled chillers in single zone (RAM) or dual zone (RAD) configurations and heated temperature control circuits 6 Models with nomial capacities from 1.1 to 4.2 tons (3.9 to 14.8 kW) and 3 or 6 kW heater per zone Wide temperature range: -5 to 90 °C ± 0.2 °C (23 to 194 °F ± 0.5 °F). ​ Standard scroll compressors and stainless steel brazed plate evaporators Proportional-integral control logic for temperature control with error lower than ±2°F ​Cycle time reduction up to 50% Standard 3-way motorized modulating temperature control valve per zone for optimized temperature accuracy Autonomous, does not require cooling water Copper tube, aluminum finned condensers with axial fans controlled by condensing temperature Standard evaporator recirculation pumps and insulated stainless steel buffer tanks Microprocessor control with proportional-integral logic and complete monitoring of the refrigeration and water circuits, including multiple languages and machine interface protocolsIdeal for small, all-electric machine or lab application and including a separate feed throat temperature control zone