Part 4 Function And Control - Daikin VRV-WIII RWEYQ72PTJU Service Manual

1. Function General.......................................................................................40
2. Stop...........................................................................................................44
3. Standby .....................................................................................................46
4. Startup Control ..........................................................................................47
5. Normal Control ..........................................................................................50
6. Protection Control .....................................................................................55
7. Special Operation......................................................................................60
8. Other Control.............................................................................................65
9. Outline of Control (Indoor Unit) .................................................................66
38
Function and Control
1.1 Symbol ....................................................................................................... 40
1.2 Operation Mode.......................................................................................... 41
1.3 Normal Operation ....................................................................................... 42
1.4 Branch Selector Unit & Indoor Unit Operation Mode Detail ....................... 43
2.1 Stopping Operation .................................................................................... 44
3.1 Restart Standby.......................................................................................... 46
3.2 Crankcase Heater Control.......................................................................... 46
4.1 Startup Control in Cooling .......................................................................... 47
4.2 Startup Control in Heating .......................................................................... 48
4.3 Pressure Equalizing Control....................................................................... 49
5.1 Compressor Control ................................................................................... 50
5.2 Electronic Expansion Valve Control ........................................................... 52
5.3 Heat Exchange Mode in Heating Operation or
Simultaneous Cooling / Heating Operation ................................................ 53
6.1 High Pressure Protection Control............................................................... 55
6.2 Low Pressure Protection Control................................................................ 56
6.3 Discharge Pipe Protection Control ............................................................. 57
6.4 Inverter Protection Control ......................................................................... 58
6.5 Cooling Fan Control ................................................................................... 59
7.1 Oil Return Operation .................................................................................. 60
7.2 Oil Return Operation of Water Heat Exchanger ......................................... 62
7.3 Pump down Residual Operation Control .................................................... 62
7.4 Refrigerant Drift Prevention........................................................................ 64
8.1 Condensing Unit Rotation .......................................................................... 65
9.1 Drain Pump Control.................................................................................... 66
9.2 Louver Control for Preventing Ceiling Dirt.................................................. 68
9.3 Room Temperature Thermistor in Remote Controller ................................ 69
9.4 Thermostat Control While in Normal Operation ......................................... 71
9.5 Thermostat Control in Dry Operation ......................................................... 71
9.6 Thermostat Control with Operation Mode Set to "AUTO" .......................... 72
9.7 Control of Electronic Expansion Valve ....................................................... 73
SiUS30-1301
Part 4
Function and Control