Scroll compressor on fridge
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• Thermo King has launched XDS SR truck refrigeration units with chlorine-free R-404A refrigerant, TherMax TM heat and frost system, "Smart Reefer" microprocessor controls and an unusual scroll compressor. This compresses the refrigerant gas between orbiting and stationary spirals to provide a near continuous discharge pressure. Following two years of field testing, the scroll compressor is said to be lighter and quieter than a conventional reciprocat ing unit with 83% fewer moving parts. These include just two single-V and triple-V drive belts in place of the usual four-belt arrangement. It features in two new XDS models; the 30SR, for cooling and heating on engine operation, and the 505R, which comes with a 380V, three-phase, 50Hz, 6kW electric motor. This also has diesel/electric auto-switching.