Daikin Altherma HT Service Manual

ESIE09-08B
Function 45
Part 5 - Function
1. Operation Mode ....................................................................................46
2. Basic Control.........................................................................................47
2.1 Normal Operation ...................................................................................47
2.2 Compressor PI Control...........................................................................48
2.3 Electronic Expansion Valve PI Control R-410A circuit ...........................49
2.4 Electronic Expansion Valve PI Control R-134a circuit............................49
3. Special Control......................................................................................50
3.1 Startup Control .......................................................................................50
3.2 Defrosting Operation ..............................................................................51
3.3 Pump-down Residual Operation ............................................................52
3.4 Stopping Operation ................................................................................53
4. Protection Control .................................................................................54
4.1 High Pressure Protection Control...........................................................54
4.2 Low Pressure Protection Control............................................................56
4.3 Discharge Pipe Protection Control .........................................................58
4.4 Inverter Protection Control .....................................................................59
5. Other Control.........................................................................................61
5.1 Heating Operation Prohibition ................................................................61
5.2 Inverter Fan Control (Switch Box Fan) ...................................................61
5.3 Crankcase Heater ..................................................................................61
6. Outline of Control (Indoor Unit) .............................................................62
6.1 Freeze Prevention ..................................................................................62
6.2 Simultaneous demand of space heating and domestic wate
r heating ...63

Daikin Altherma HT Specifications

General

Type	Air-to-water heat pump
Refrigerant	R-410A
Water Outlet Temperature	Up to 80°C
Operating Temperature Range	-20°C to 35°C
Power Supply	3-phase, 400V
Energy Efficiency Class (Heating)	A++