Vaillant VRC 630, Operating Manual

Page: 82 / 152

5.2 Connecting a boiler with eBUS
Open the control box of the boiler as described in the
installation instructions.
Fig. 5.2 Connecting the boiler
b
Caution!
Malfunction caused by incorrect wiring!
The eBUS connection must be used on boilers
with eBUS, as the system will not function
otherwise.
Do not use terminals 7/8/9 in parallel with
eBUS.
With cascades, connect all the other boilers via a
VR 32.
Enter the corresponding unit number on the address
switch in the VR 32 bus coupler.
Example: "2" for the 2nd boiler,
"3" for the 3rd boiler, etc.
b
Caution!
Malfunction caused by incorrect polarity!
Incorrect polarity prevents communication
via the eBUS and can result in a short circuit.
The controller will no longer be able to cont-
rol the heating installation.
Pay attention to the correct polarity.
Wire up the connections to the boiler as shown in
Fig. 5.2.
The eBUS line (at least 2x 0.75 mm 2 ) must be supplied
by the customer.
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i
The controller has a mains switch which can
be used to switch off the internal electronics
and all connected actuators (pumps, mixers)
for testing or maintenance purposes.
If the maximum total current of 6.3 A or the maximum
contact load of 2 A is exceeded within the system, the
consumer(s) must be wired via a contactor.
External units or units (up to six are possible) which are
activated in stages can each be connected via a VR 31
bus coupler.
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Installation Instructions VRC 630 0020095108_00
5 Electrical installation