Piping DiagramSamsung Electronics 219Main cooling operationƒ PurposeSwitch to heating mode on some indoor units while using cooling modeƒ Control specifications in detail7-3 Functions (cont.)7-3-2-3 Normal operation modes (cont.)7-3-2 Control (cont.)Actuator Abbrev. - Normal CoolingCompressor COMP Operation Target high pressure control(default : 7kgf/ )Range 14 - 120HzElectronic Expansion Valve– Main (Main EEV) E_M Operation Cooling & Heating capacity balance controlRange 300 ~ 2000stepElectronic Expansion Valve– EVI (EVI EEV) E_EVI Operation *Subcooling control(default : SC 20k)Range 0-480stepSolenoid Valve - 4way V_4W Operation OffSolenoid Valve – EVI Bypass V_EB Operation On (Open): *T_w > 40ఁ or 50Hz ײOff (Close): T_w < 38ײఁ and 65Hz װSolenoid Valve – EVI V_EVI Operation On (Open)Solenoid Valve – Hot Gas Bypass V_HG Operation Off (Close)Solenoid Valve – Accumulator Oil Return V_AR Operation On (Open)Solenoid Valve – Hot Gas Bypass 2 V_HG2 Operation Main Cooling : On(Open), Cooling : Off(Close)Solenoid Valve-Liquid Tube V_L Operation Off (Close)Solenoid Valve – Main Cooling V_MC Operation Off (Close)Solenoid Valve-Hot Gas Charging V_HC Operation Off(Close) / On(Open) when high pressure is low
