SiENBE37-701
Function 101
Part 4
Function
1. Function General.................................................................................102
1.1 Symbol .................................................................................................102
1.2 Operation Mode....................................................................................104
2. Basic Control.......................................................................................105
2.1 Normal Operation .................................................................................105
2.2 Compressor PI Control.........................................................................106
2.3 Electronic Expansion Valve PI Control.................................................114
2.4 Step Control of Outdoor Unit Fans .......................................................114
2.5 Outdoor Unit Fan Control in Cooling Operation ...................................115
2.6 Heat Exchanger Control .......................................................................116
3. Special Control....................................................................................117
3.1 Startup Control .....................................................................................117
3.2 Large Capacity Start Up Control (Heating)...........................................119
3.3 Oil Return Operation ............................................................................120
3.4 Defrost Operation .................................................................................124
3.5 Pump-down Residual Operation ..........................................................126
3.6 Standby ................................................................................................128
3.7 Stopping Operation ..............................................................................129
4. Protection Control ...............................................................................130
4.1 High Pressure Protection Control.........................................................130
4.2 Low Pressure Protection Control..........................................................132
4.3 Discharge Pipe Protection Control .......................................................134
4.4 Inverter Protection Control ...................................................................135
4.5 STD Compressor Overload Protection.................................................137
5. Other Control.......................................................................................138
5.1 Backup Operation.................................................................................138
5.2 Demand Operation ...............................................................................138
5.3 Heating Operation Prohibition ..............................................................138
6. Outline of Control (Indoor Unit) ...........................................................139
6.1 Operation Flow Chart ...........................................................................139
6.2 Thermostat Control...............................................................................141
6.3 Drain Pump Control..............................................................................145
6.4 Control of Electronic Expansion Valve .................................................147
6.5 Freeze Prevention ................................................................................148
6.6 Heater Control (Optional PC Board KRP1B...is required.) ...................149
6.7 List of Swing Flap Operations ..............................................................150
6.8 Hot Start Control (In Heating Operation Only)......................................151
6.9 Louver Control for Preventing Ceiling Dirt............................................152
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