Brief descriptions of the inputs and the outputs are summarized as follows.
Terminal Assigments Terminal Assignments
G Power supply AC/DC 24 V Q13 Supply 1 (AC 24 V …230 V)
G0 Power supply ground Q14 Compressor1
PE Saftey ground Q24 Compressor2
Q34 Indoor water pump
X1 Inlet water temperature of indoor side Q44 Outdoor water pump
X2 Outlet water temperature of indoor side Q54 4-way valve
X3 Atmospheric temperature of outdoor Q64 Boiler
X4 Hot water temperature
X5 Outlet water temperature of outdoor side Q23 Supply 2 (AC 24 V …230 V)
X6
Inlet water temperature of outdoor side or
evaporating temperature
Q74 Hot water pump
GND Common reference point for analog input Q84 Alarm
+5 V DC 5 V power output for active sensor Y1 Analog ouput 1, 0...10 V
+24 V DC 24 V power output for active sensor GND Common reference point
Y2 Analog output 2, 0...10 V
D1 Water flow switch
D2 Low pressure switch A+ A+ connector for RS485
D3 high pressure switch B- B- connector for RS485
D4 Air condition switch GND Optional for RS485 communication
D5 Hot water switch RJ45
Service interface for parameters
uploading and downloading
M Common reference point for digital input
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Siemens Building Technologies SIEMENS Controller HEAT PUMP controller
HVAC Products 27.11.2006
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