Wiring Diagrams - Vaillant ecoTEC plus 937 Instructions And Maintenance Instructions

4.19.4 Wiring diagrams

Fig. 4.19 Wiring diagram electronics box
Installation and maintenance instructions ecoTEC plus 0020031552_03
Sequence of operations during installation 4
Shift load storage tank connection
Shift load storage tank pump connection
Burner cable harness
Accessory module connection
Diagnosis via eBUS,
vrnetDIALOG
External
sensor
external feed or return
line sensor
Wiring harness hydraulics
Connection for
external eBUS controller
Room thermostat 24 V:
Connection 7, 8 und 9
No bi-directional interface
(only analogue)
Mains connection 230 V/50 Hz
Room thermostat 230 V/50 Hz
(Remove bridge when connecting)
Heating pump
2 speed pump (plug with 5 pins)
Attention:
Do not connect
mains voltage
Danger of destroying
the electronics!
Fuse 2 A, slow-acting
Igniter
Shift load storage tank
pump connection 230 V
27