Daikin VRV IV-S RXTQ-TAVJU Series, Service Manual

Page: 44 / 272

SiUS331604E
31 Functions and Control
Part 4
Functions and Control
1. Operation Mode ........................................................................................32
2. Basic Control............................................................................................. 33
2.1 Normal Operation ....................................................................................... 33
2.2 Compressor PI Control............................................................................... 34
2.3 Electronic Expansion Valve PI Control....................................................... 35
2.4 Cooling Operation Fan Control................................................................... 36
3. Special Control..........................................................................................37
3.1 Startup Control ........................................................................................... 37
3.2 Oil Return Operation .................................................................................. 39
3.3 Defrost Operation ....................................................................................... 41
3.4 Pump down Residual Operation................................................................. 42
3.5 Restart Standby.......................................................................................... 43
3.6 Stopping Operation .................................................................................... 43
4. Protection Control .....................................................................................44
4.1 High Pressure Protection Control............................................................... 44
4.2 Low Pressure Protection Control................................................................ 46
4.3 Discharge Pipe Protection Control ............................................................. 47
4.4 Inverter Protection Control ......................................................................... 48
5. Other Control............................................................................................. 50
5.1 Demand Operation ..................................................................................... 50
5.2 Heating Operation Prohibition .................................................................... 50
6. Outline of Control (Indoor Unit) ................................................................. 51
6.1 Operation Flow Chart ................................................................................. 51
6.2 Set Temperature and Control Temperature ............................................... 53
6.3 Thermostat Control..................................................................................... 55
6.4 Operations of Swing Flaps ......................................................................... 58
6.5 Hot Start Control (In Heating Operation Only)............................................ 59
6.6 Louver Control for Preventing Ceiling Dirt.................................................. 60
6.7 Drain Pump Control.................................................................................... 61
6.8 Electronic Expansion Valve Control ........................................................... 63
6.9 Freeze-up Prevention................................................................................. 64
6.10 Heater Control (Optional PCB KRP1B series is required.)......................... 66
6.11 Heater Control (FXTQ) ............................................................................... 67
6.12 4 Step Thermostat Processing (FXTQ) ...................................................... 69
6.13 Interlocked with External Equipment (FXTQ) ............................................. 70