Daikin RQYQ140-180PY1 Service Manual

Also see for VRV III-Q RQCEQ360PY1: Operation manual Operation manual Installation manual

Contents

Daikin RQYQ140-180PY1 Service Manual Manual pdf 46 page image

Detailed Control Functions SiBE34100137 Function2. Detailed Control Functions2.1 Stop Operation2.1.1 Stop due to MalfunctionIn order to protect compressors, if any of the abnormal state occurs, the system will make "stop with thermostat OFF"and the malfunction will be determined according to the number of retry times.(Refer to "Malfunction code list" (P.107~) of the troubleshooting for the items to determine the malfunction.)∗ Operation to determine the malfunction: "Stop the system" and "malfunction code" is displayed on the remotecontroller.2.1.2 When System is in Stop ModeStop both the master and slave units.The four way valves both for heat exchanger switch and piping switch retain the condition before they were stopped.2.2 Standby2.2.1 Restart StandbyUsed to forcedly stop the compressor for a period of 3 minutes, in order to prevent the frequent ON/OFF of thecompressor and equalize the pressure within the refrigerant system.In addition, the outdoor fan carry out the residual operation for a while to suppress the acceleration of the pressureequalizing and melting of the refrigerant to the evaporator.2.2.2 Crankcase Heater ControlIn order to prevent the refrigerant from melting in the compressor oil in the stopped mode, this mode is used to controlthe crankcase heater.2.3 Rotation Control2.3.1 Outdoor Unit RotationIn the case of multi-outdoor-unit system, this outdoor unit rotation is used to prevent the compressor from burning outdue to unbalanced oil level between outdoor units.[Timing of outdoor unit rotation]· At the beginning of startup controlCrankcase heaterOFFCrankcase heaterONDischarge pipetemperature < 70˚CDischarge pipetemperature > 75˚COutdoor Unit 1 Outdoor Unit 2Previous time Priority 1 Priority 2This time Priority 2 Priority 1Next time Priority 1 Priority 2Outdoor Unit 1 Outdoor Unit 2 Outdoor Unit 3Previous time Priority 1 Priority 2 Priority 3This time Priority 3 Priority 1 Priority 2Next time Priority 2 Priority 3 Priority 1One time after the next Priority 1 Priority 2 Priority 3Outdoor Unit 1 Outdoor Unit 2 Outdoor Unit 3 Outdoor Unit 3Previous time Priority 1 Priority 2 Priority 3 Priority 4This time Priority 4 Priority 1 Priority 2 Priority 3Next time Priority 3 Priority 4 Priority 1 Priority 2One time after the next Priority 2 Priority 3 Priority 4 Priority 1One time after thenext plus one Priority 1 Priority 2 Priority 3 Priority 4