... CIRCUITCopper tube connection with charge valves, filter, thermostatic expansion valve (capillary for mod. 4.5-14), gas-liquid separator, high pressure ... with user side and source side water inlet/outlet connectors, water discharge connectors, air vent valve, mod.4.5-30 the ... , cinemas, stadiums, recreations, office blocks, factories and so on. water source heat pump water heater (muti-function type)