Daikin RXYQ96PYDN Service Manual page 134

SiUS34-801A_b
VRVIII R-410A Heat Recovery
1. Specifications ..........................................................................................121
2. Refrigerant Circuit ...................................................................................128
3. Functional Parts Layout ..........................................................................137
4. Refrigerant Flow for Each Operation Mode.............................................141
5. Function General.....................................................................................185
6. Basic Control...........................................................................................188
7. Special Control........................................................................................197
8. Protection Control ...................................................................................210
VRVIII R-410A Heat Recovery 60Hz
1.1 Outdoor Units ........................................................................................... 121
1.2 BS Units ................................................................................................... 126
2.1 REYQ72, 96, 120PYDN, PTJU ................................................................ 128
2.2 REYQ144PTJU ........................................................................................ 130
2.3 REMQ72PYDN, PTJU (Multi 6ton)........................................................... 132
2.4 REMQ96, 120PYDN, PTJU (Multi 8, 10ton)............................................. 134
2.5 BS Unit Functional Parts .......................................................................... 136
3.1 REYQ72P, 96P, 120P .............................................................................. 137
3.2 REYQ144PTJU ........................................................................................ 138
3.3 REMQ72P ................................................................................................ 139
3.4 REMQ96P, 120P...................................................................................... 140
5.1 Symbol ..................................................................................................... 185
5.2 Operation Mode........................................................................................ 187
6.1 Normal Operation ..................................................................................... 188
6.2 Compressor PI Control............................................................................. 189
6.3 Electronic Expansion Valve PI Control..................................................... 193
6.4 Step Control of Outdoor Unit Fans ........................................................... 194
6.5 Outdoor Unit Fan Control in Cooling Operation ....................................... 194
6.6 Heat Exchanger Control ........................................................................... 195
7.1 Startup Control ......................................................................................... 197
7.2 Large Capacity Start Up Control (Heating)............................................... 198
7.3 Oil Return Operation ................................................................................ 199
7.4 Defrost Operation ..................................................................................... 203
7.5 Pump-down Residual Operation .............................................................. 205
7.6 Standby .................................................................................................... 207
7.7 Stopping Operation .................................................................................. 208
8.1 High Pressure Protection Control............................................................. 210
8.2 Low Pressure Protection Control.............................................................. 211
8.3 Discharge Pipe Protection Control ........................................................... 213
8.4 Inverter Protection Control ....................................................................... 214
Part 3
60Hz
119