Daikin ERQ Series Service Manual page 31

ESiEN09-06 A
1. Function general ...................................................................................22
2. Basic Control.........................................................................................24
3. Special Control......................................................................................29
4. Protection Control .................................................................................36
5. Other Control.........................................................................................41
6. Outline of Control ..................................................................................44
Function
1.1 Symbol ...................................................................................................22
1.2 Operation Mode......................................................................................23
2.1 Normal Operation ...................................................................................24
2.2 Compressor PI Control...........................................................................25
2.3 Step Control of Outdoor Unit Fans .........................................................27
2.4 Outdoor Unit Fan Control in Cooling Operation .....................................28
3.1 Startup Control .......................................................................................29
3.2 Oil Return Operation ..............................................................................30
3.3 Defrosting Operation ..............................................................................32
3.4 Pump-down Residual Operation ............................................................33
3.5 Standby ..................................................................................................34
3.6 Stopping Operation ................................................................................35
4.1 High Pressure Protection Control...........................................................36
4.2 Low Pressure Protection Control............................................................37
4.3 Discharge Pipe Protection Control .........................................................38
4.4 Inverter Protection Control .....................................................................39
4.5 STD Compressor Overload Protection...................................................40
4.6 Injection Control (only for ERQ 125 A7W1B) .........................................40
5.1 Emergency Operation (only for ERQ 250 A7W1B) ................................41
5.2 Demand Operation .................................................................................43
5.3 Heating Operation Prohibition ................................................................43
6.1 Thermostat Sensor in Remote Control (only for Z-control) ....................44
6.2 Hot Start Control (In Heating Operation Only)........................................45
6.3 Freeze Prevention ..................................................................................46
6.4 Low Outdoor Air Temperature Protection Control ..................................47
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