ecoTEC plus 937 installation and maintenance manual
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BUS
— +
24V
7 8 9
230V
L N 3 4 5
X3
1
X12
Boiler electronics box
Storage tank charging sensor (NTC)
X 1/3 Violet
X 1/1 Black
Pump
X 1/7 Green
X 1/1 Black
X 1/8 red
Storage tank sensor (NTC)
X 1/4 orange
X 1/1 Black
Plug
connection
Aqua-Sensor
Shift load storage tank electronics
X 1/2 brown
X 1/1 Black
X 1/2 Brown
X 1/1 Black
X 1/6 Blue
X 1/1 Black
Inlet sensor SWT (NTC)
X 1/10 Black
X 1/11 Red
X 1/9 Grey
X40
X41
Fig. 4.21 Wiring diagram shift load storage tank
4 Sequence of operations during installation