Electrical installation
60
Installation instructions geoTHERM 0020051574_04
7
>
Fit an external, motor-controlled 3-way brine mixing
valve
>
Connect the external motor-controlled 3-way brine mix-
ing valve to terminal HK2 (
6
) (
¬
Fig.
7.18
).
>
Fit an external heating/cylinder charging diverter valve.
>
Connect an external heating/cylinder charging diverter
valve to terminal LP/UV1 (
2
) (
¬
Fig.
7.18
) an.
>
Fit two external heating/cooling diverter valves and
a second external brine circuit pump cooling in the brine
circuit.
>
Connect the two external heating/cooling diverter valves
and the second external brine circuit pump cooling to
terminal SK2-P (
4
) (
¬
Fig.
7.18
) an.
>
Fit an external 3-way brine mixing valve cooling.
>
Connect the external 3-way brine mixing valve cooling as
described in (
¬
Ch.
7.3.9
).
Also refer to the sample hydraulic schemes (
¬
Fig. 5.2
to
¬
Fig. 5.6
).
7.7
Installing optional accessories
e
Danger!
Risk of electric shock!
>
Switch of the electricity supply before
you connect additional equipment to the
controller PCB via the eBUS.
>
Check that there is no voltage.
You can connect the following optional accessories:
– Up to six VR 60 mixer modules to add twelve system cir-
cuits to the heating installation (factory set by default as
mixed circuits).
– Up to six VR 90 remote control units to control the first
six heating circuits.
– vrnetDIALOG 840/2 or 860/2
– Each connection is connected in parallel to an eBUS ter-
minal (
11
) (
¬
Fig.
7.18
).
7.7.1
Installing VR 90
If you install several heating circuits, you can connect a sep-
arate VR 90 remote control unit for each of the first six
heating circuits. It allows the operation mode and target
room temperature to be set and, if required, it uses the
installed room temperature sensor to take the room tem-
perature into consideration. In addition, the “switch-on
room temp.” must be set in the controller for the heat
pump (
menu C5
) (
¬
Tab. 9.6
)
or in the VR 90.
In each case, you can set the parameters for the relevant
heating circuit (time programme, heating curve, etc.) and
select special functions (Party etc.).
In addition, it is possible to query the heating circuit and to
display service and fault messages.
To fit the VR 90 remote control unit, see its enclosed
¬ installation instructions
.
The VR 90 remote control units communicate with the
heating controller via the eBus. You can connect them to
any interface in the system. You need only to ensure that
the eBUS interface is connected to the heat pump control-
ler.
eBUS
7.21
Installing remote control units
The structure of the Vaillant system allows you to lay the
eBus from component to component (
¬
Fig. 7.21
. Switching
the lines therefore does not impair communication.
All eBus connector plugs are designed to allow you to wire
at least 2 x 0.75 mm
2
for each connection lead.
The use of cable with a cross-section of 2 x 0.75 mm
2
is
therefore recommended for eBUS cables.
Setting the bus address
To ensure that no problems can occur in the communica-
tion between all components, each remote control unit
must receive an addressing that corresponds to the control-
ling heating circuit.
>
On the first VR 90 remote control unit, set the bus
address to “2” for heating circuit 2 (integrated into the
geoTHERM heat pump).
>
For any other remote control units, set bus different
addresses that also differ from this and whose numbers
correspond to the heating circuit, e. g. bus address 5 for
heating circuit 5 (the addresses 0, 1
and 3 are assigned internally and are not available). Take
note of the VR 90 installation manual.
