... Pum -CE Certificate -High Efficiency&Muti-fuction LTWH Series High Quality Ground Source Heat Pump for Houses and Commerical UseHeat ... COMPRESSORSUse brand semi-closed worm or hermetic scroll compressor with low energy consumption, stable operation, and little ... CIRCUITCopper tube connection with charge valves, filter, thermostatic expansion valve, gas-liquid separator, high pressure switch and ...