49
Terminals
Function
Explanation
X3.17
X3.18
Fuse F1 6.3 A (slow)
X3.18
Heat pump control unit
power supply:
Phase L1
X1.1 Earth conductor con-
nection
X2.1 Neutral conductor
connection
Power supply 230 V~
Controller and sensor PCB (sensors)
Set the required parameters during com-
missioning; see from page 71.
Note
Flow temperature sensor for heating
circuit with mixer M3/HC3: The flow
temperature sensor for one heating cir-
cuit with mixer M3/HC3 is connected to
the mixer extension kit (accessories).
Plug
Sensor
Type
F0.1/F0.2
Outside temperature sensor
NTC 10 kΩ
F0.2/F0.3
Radio clock receiver (accessories)
DCF
F4
Buffer temperature sensor
NTC 10 kΩ
F6
Cylinder temperature sensor, top
NTC 10 kΩ
F7
Cylinder temperature sensor, bottom
NTC 10 kΩ
F11
Contact humidistat 24 V–
―
F12
Flow temperature sensor heating circuit with mixer M2/
HC2
NTC 10 kΩ
F13
System flow temperature sensor, with sensor well, down-
stream of heating water buffer cylinder
NTC 10 kΩ
F14
Flow temperature sensor, cooling circuit (heating circuit
without mixer A1/HC1 or separate cooling circuit SKK)
NTC 10 kΩ
F16
Room temperature sensor for separate cooling circuit
NTC 10 kΩ
F20
Boiler water temperature sensor, external heat genera-
tor
NTC 10 kΩ
F26
Buffer temperature sensor, cooling
NTC 10 kΩ
F27
Flow temperature sensor, secondary circuit for heat pump
stage 2
Pt500A
(PTC)
aJ
B
(X25.13/
X25.14)
Return temperature sensor, secondary circuit, for heat
pump stage 2 (if installed)
Pt500A
(PTC)
Installation sequence
Electrical connections
(cont.)
5546 267 GB
Installation