SiBE31-801_C
Function 80
Part 4
Function
1. Function General...................................................................................82
1.1 Operation Modes....................................................................................82
1.2 Symbol ...................................................................................................83
2. Stopping Operation ...............................................................................84
2.1 When System is in Stop Mode ...............................................................84
2.2 Stop due to Malfunction..........................................................................84
3. Standby .................................................................................................85
3.1 Restart Standby......................................................................................85
3.2 Crankcase Heater Control......................................................................85
4. Rotation Control ....................................................................................86
4.1 Rotation of Outdoor Units.......................................................................86
4.2 Operating Priority and Rotation of Compressors....................................86
5. Startup Control ......................................................................................87
5.1 Startup Control in Cooling Operation .....................................................87
5.2 Startup Control in Heating Operation .....................................................88
5.3 Startup Control of Function Unit
(only for heating operation at low outdoor air temperature) ...................89
6. Normal Operation..................................................................................90
6.1 List of Functions in Normal Operation ....................................................90
6.2 Compressor Control ...............................................................................91
6.3 Electronic Expansion Valve PI Control...................................................94
6.4 Outdoor Unit Fan Control .......................................................................95
6.5 Control for Cooling Operation at Low Outdoor Air Temperature............95
6.6 Control for Heating Operation at Low Outdoor Air Temperature............96
6.7 Refrigerant Flow Rate Control................................................................97
7. Protection Control .................................................................................98
7.1 High Pressure Protection Control...........................................................98
7.2 Low Pressure Protection Control..........................................................100
7.3 Discharge Pipe Protection Control .......................................................102
7.4 Inverter Protection Control ...................................................................103
7.5 STD Compressor Overload Protection.................................................104
7.6 Cooling Fan Control for
Radiation Fin Temperature of Function Unit ........................................104
7.7 Heater Control for Function Unit Switch Box........................................104
8. Special Control....................................................................................105
8.1 Pump down Residual Operation...........................................................105
8.2 Oil Return Operation ............................................................................107
8.3 Defrost Operation .................................................................................111
8.4 Emergency Operation ..........................................................................113
9. Outline of Control (Indoor Unit) ...........................................................114
9.1 Operation Flow Chart ...........................................................................114
9.2 Thermostat Control...............................................................................116
9.3 Drain Pump Control..............................................................................121
9.4 Freeze Prevention ................................................................................124
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