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Siemens
User Manual
CE1U2357en
Building Technologies
7 Plant diagrams
2014-07-30
Return sensor
Legend
Diagram
Function
Connection
K4
Burner 1st stage
T1, T2
Q1
boiler pump
QX1, QX2
Q2
1. eating circuit pump,
boiler pump
Q2
Q3
DHW charging pump / diverting valve
Q3
Q4
circulating pump
QX1, QX2
Q5
Collector pump
QX1, QX2
Q6
2. Heating circuit pump
Q6
Q12
Bypass pump
QX1, QX2
Q15/18
Pump H1/2
QX1, QX2
Q20
heating circuit pump HCP
QX1, QX2
Y1
1. eating circuit mixing valve
Y1, Y2
Y5
2. eating circuit mixing valve
Y5, Y6
K6
electric immersion heater
QX1, QX2
Mains voltage
2
3
5
8
A
1
1
Q3
B3
B31
2
3
5
8
A
1
3
B2
K4
B7