Daikin REYQ8-48PY1B Service Manual

Also see for VRV III: Installation manual Operation manual Service manual Operation manual Technical data

Contents

Refrigerant Flow for Each Operation Mode SiENBE37-70198 Refrigerant CircuitPressure equalizing when switching operation cooling/ heating1. When switching operation from to cooling to heatingFirst, the electric expansion valves for EVHS, EVH, EVL and EVLS of the indoor unit will beclosed.Next, open the EVHS, and it makes to balance the system pressure.Finally, EVH and EVHS are opened and the electric expansion valve of the indoor unit isopened to start the operation as a heating circuit.In coolingoperationIn equalizationTo heatingoperationEVHEVLEVHSEVLSEVSCCoolingUnitIndoor Unit BS UnitLiquidPipeDualPressureGas PipeSuctionPipe(Close)Indoor Unit BS UnitLiquidPipeDualPressureGas PipeSuctionPipeEVH (Close)EVLS (Close)EVHS (Open)EVL (Close)EVSCIndoor Unit BS UnitLiquidPipeDualPressureGas PipeSuctionPipeEVHEVLSEVHSEVLEVSCHeatingUnit