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System principle schematic
18. System principle schematic
1 Control circuit
2 Power supply of heat source system
3 Power supply to electric auxiliary heater
4 PSU signal contact
5 Outdoor temperature
6 Heat source system bus (connection between indoor
and outdoor units)
7 KNX connection (room temperature sensor)
8 High limit safety cut-out, pump, heating circuit 1
9 Heat source system error signal
A Power supply, heat source system for three-phase
power supply
B Power supply, heat source system for single-phase
power supply
C Indoor unit control box
D Indoor unit
E Room temperature sensor
F Outdoor unit
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