Daikin FXDQ20PVET [94/394] Function general 4

Si34-704

Function 83

Part 4

Function

1. Function general ...................................................................................84

1.1 Symbol ...................................................................................................84

1.2 Operation Mode......................................................................................85

2. Basic Control.........................................................................................86

2.1 Normal Operation ...................................................................................86

2.2 Compressor PI Control...........................................................................86

2.3 Electronic Expansion Valve PI Control...................................................98

2.4 Step Control of Outdoor Unit Fans .........................................................98

2.5 Outdoor Unit Fan Control in Cooling Operation .....................................98

3. Special Control......................................................................................99

3.1 Startup Control .......................................................................................99

3.2 Oil Return Operation ............................................................................100

3.3 Pump-down Residual Operation ..........................................................101

3.4 Standby ................................................................................................102

3.5 Stopping Operation ..............................................................................103

4. Protection Control ...............................................................................105

4.1 High Pressure Protection Control.........................................................105

4.2 Low Pressure Protection Control..........................................................106

4.3 Discharge Pipe Protection Control .......................................................107

4.4 Inverter Protection Control ...................................................................108

4.5 STD Compressor Overload Protection.................................................109

4.6 Injection Control (only for RXQ5P) .......................................................109

5. Other Control.......................................................................................110

5.1 Outdoor Unit Rotation...........................................................................110

5.2 Emergency Operation ..........................................................................111

5.3 Demand Operation ...............................................................................115

6. Outline of Control (Indoor Unit) ...........................................................116

6.1 Drain Pump Control..............................................................................116

6.2 Louver Control for Preventing Ceiling Dirt............................................118

6.3 Thermostat Sensor in Remote Controller.............................................119

6.4 Thermostat Control while in Normal Operation ....................................120

6.5 Thermostat Control in Dry Operation ...................................................120

6.6 Electronic Expansion Valve Control .....................................................121

6.7 Freeze Prevention ................................................................................122

6.8 List of Swing Flap Operations ..............................................................123

6.9 Control of Outdoor Air Processing Unit

(Unique Control for Outdoor Air Processing Unit) ................................124