... flexible close cell material.REFRIGERANT CIRCUITCopper tube connection with charge valves, filter, thermostatic expansion valve, gas-liquid separator ... .23.54.04.54.86.1Control SystemDedicated heat pump controller,PID regulatorSecurityOverload, high voltage, wrong Phase, water, ... .3Pressure LossKpa≤40Interface Dim.DN(mm)2525253232324040405050 LTWH Series High Quality Ground Source Heat Pump for Houses ...