6
Installation instructions 0020140122_04
3
Description of the product
3.1
Product Overview
The control centre provides a system solution which permits
eBUS controllers to be combined with room thermostats,
valves, multizone heating and domestic hot water cylinder
systems. There are 3 functional modes that can be selected
with the rotary switch:
– Multizone mode (position 0) with VR 66/2 functions in
combination with VRT 350
– Multizone mode (position 2) with VR 66/2 functions in
combination with one VRT 380 and one VR 92
– Monozone mode (position 1) with VR65 functions.
230V~
CYL.
2
1
DHW
CH1
CH2
ON DHW OFF
1
2
-
+
BUS
NTC
0
1
Key
1
Rotary switch
3.2
Product structure
3.2.1 Monozone operation mode
The Monozone operation mode is compatible with:
– ebus control range
– system and open vent boiler
It allows the controller to communicate with the traditional
230 V zone valves and DHW storage cylinder. Information
about the heat required by the cylinder is communicated to
the heating appliance. The heating appliance (boiler) then
decides whether a hot water request has to be fulfilled and
sends a signal to position the 230 V zone valves.
The initial start-up of the control centre is carried out
together with the initial start-up of the boiler.
i
If a VR65 is replaced by a VR 66/2 it has to be
set on monozone mode.
3.2.2 Priorities are defined as follows:
Value of
diagnostic
code d.70
Meaning
0
Hot water priority
– The 3-port valve is in the heating or hot water
position depending on the operating mode.
– With 2-port valves, either the DHW valve or the
CH valve is open, both valves are closed on
standby.
1
Enable mid position
– The 3-port valve is in the mid position for simul-
taneous heating and hot water request, or in the
heating or hot water position, depending on the
operating mode.
– With 2-port valves, both valves are open during
simultaneous heating and hot water request.
Otherwise, only one valve is always open and
both valves are closed on standby.
2
Only heating mode (only for test operation!)
– Only the CH valve is activated.
NOTE: Factory settings of boiler = 0 : hot water priority.
