... .REFRIGERANT CIRCUITCopper tube connection with charge valves, filter, thermostatic expansion valve (capillary for mod. 4.5÷14), gas-liquid separator, ... pump units are complete also with 4-way valve and one way valve.HYDRAULIC CIRCUITBuilt with user side and source side ... water inlet/outlet connectors, water discharge connectors, air vent valve, mod.4.5÷30 the user side is complete also ...