... compressors,strong operation and long life.4. Emerson ALCO expansion valve,with accuate and stable throttling function.5. High efficiency coaxial coil ... exchanger,low fouling,low maintenance cost.6. Durable coating,with special casing design adopting bolts and nuts,no damage to ... R407C/R410A.10.Have been tested and designed in accordance with Europen standards.Air source heat pump/modular air-cooled ...