Vaillant VR 66/2 - 3.2 Product Structure; 3.2.1 Monozone Operation Mode; 3.2.2 Priorities in Monozone Mode

EN
0020140122_03 - 12/19 - Vaillant
- 5 -
INTRODUCTION
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 posi-
tion 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 simultaneous
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 simul-
taneous 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.