Part 4 Functions And Control - Daikin VRV EMERION RXYQ-AATJA Service Manual

1. Operation Flowchart..................................................................................99
2. Stop Control ............................................................................................100
3. Standby Control ......................................................................................101
4. Startup Control ........................................................................................102
5. Basic Control...........................................................................................103
6. Protection Control ...................................................................................111
7. Special Control........................................................................................115
8. Other Control...........................................................................................120
9. Outline of Control (Indoor Unit) ...............................................................121
97
Functions and Control
2.1 Stop due to Error ...................................................................................... 100
2.2 When System is in Stop Control............................................................... 100
2.3 Sub Unit Stops during Master Unit Control .............................................. 100
3.1 Restart Standby........................................................................................ 101
3.2 Crankcase Heater Control........................................................................ 101
4.1 Startup Control in Cooling ........................................................................ 102
4.2 Startup Control in Heating ........................................................................ 102
5.1 Normal Control ......................................................................................... 103
5.2 Compressor PI Control............................................................................. 104
5.3 Compressor Step Control......................................................................... 105
5.4 Electronic Expansion Valve PI Control..................................................... 109
5.5 Step Control of Outdoor Fans .................................................................. 110
6.1 High Pressure Protection Control............................................................. 111
6.2 Low Pressure Protection Control.............................................................. 112
6.3 Discharge Pipe Protection Control ........................................................... 112
6.4 Inverter Protection Control ....................................................................... 113
7.1 Pump Down Residual Operation .............................................................. 115
7.2 Oil Return Operation ................................................................................ 116
7.3 Defrost Operation ..................................................................................... 118
7.4 Outdoor Unit Rotation............................................................................... 119
8.1 Backup Operation..................................................................................... 120
8.2 Heating Operation Prohibition .................................................................. 120
9.1 Operation Flowchart ................................................................................. 121
9.2 Set Temperature and Control Target Temperature.................................. 125
9.3 Remote Controller Thermistor .................................................................. 127
9.4 Thermostat Control................................................................................... 129
9.5 Drain Pump Control.................................................................................. 132
9.6 Control of Electronic Expansion Valve ..................................................... 134
9.7 Freeze-Up Prevention Control.................................................................. 135
SiUS342303E
Part 4

Part 4 Functions and Control