Vaillant ecoTEC plus 937 Service Manual download pdf (Page 34)

34 Installation and maintenance instructions ecoTEC plus 937 0020031552_06

5.19.4 Connection diagrams

Burner cable harness

Wiring harness hydraulics

Connection for

external eBUS controller

Room thermostat 24 V:

Connection 7, 8 und 9

No bi-directional interface

(only analogue)

Room thermostat 230 V/50 Hz

(Remove bridge when connecting)

Heating pump

2 speed pump (plug with 5 pins)

Mains connection 230 V/50 Hz

Fuse 2 A, slow-acting

Igniter

Attention:

Do not connect

mains voltage

Danger of destroying

the electronics!

Diagnosis via eBUS,

vrnetDIALOG

Accessory module connection

External

sensor

external feed or return

line sensor

Shift load storage tank

pump connection 230 V

Shift load storage tank connection

Shift load storage tank pump connection

Fig. 5.19 Connection diagram electronics box

5 Sequence of operations during installation

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 ... 79 80

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Vaillant ecoTEC plus 937 Service Manual Page 34