Vaillant ecoTEC plus 937 Instructions And Maintenance Instructions page 29

X 1/3 Violet
X 1/1 Black
X 1/4 orange
X 1/1 Black
X 1/6 Blue
X 1/1 Black
X 1/7 Green
X 1/1 Black
X 1/8 red
X 1/10 Black
X 1/11 Red
X 1/9 Grey
Boiler electronics box
Fig. 4.21 Wiring diagram shift load storage tank
Installation and maintenance instructions ecoTEC plus 0020031552_03
Sequence of operations during installation 4
Storage tank charging sensor (NTC)
Storage tank sensor (NTC)
Inlet sensor SWT (NTC)
X 1/2 Brown
X 1/1 Black
X40 X41
Shift load storage tank electronics
Aqua-Sensor
Plug
connection
X 1/2 brown
X 1/1 Black
— + 7 8 9 L N 3 4 5
BUS 24V
230V
Pump
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