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INTRODUCTION
3.2.3
Monozone mode : Open vent or system boiler with DHW cylinder, 3-Port Valve
2
DHW cylinder with NTC
230V~
2
4
16A
Key
1
Room thermostat
2
System boiler
3
3-port valve
4
Electrical supply
5
VR66 control unit
6
Bypass necessary with open vent boilers
7
Domestic hot water cylinder
8
NTC (not supplied)
9
Cylinder thermostat
10 Heating circuit
EN
11 Overheating safety (if underfl oor heating)
A
Boiler circuit return
B
Boiler circuit fl ow
C
Cold water supply
D
Domestic hot water outlet
- 6 -
1
5
D
7
EBUS
4
A
6
B
5
DHW
ON
DHW
OFF
CYL.
CH1
BUS
CH2
+
-
1
L
N L
L
3
BUS
2
16A
EBUS
8
9
C
4
1m min.
NTC
2
1
9
4
BUS
1
∙ Connect the live wire (white or brown) of the valve to the "L" of
the CH1 connector.
∙ Connect the earth wire (yellow/green) of the valve to the earth
of the DWH ON connector.
∙ Connect the neutral wire (blue) of the valve to the "N" of the
DWH ON connector.
∙ Connect the live wire (orange) of the valve to the "L" of the
DWH ON connector.
∙ Connect the live wire (grey) of the valve to the "L" of the DWH
OFF CH2.
1
11
DHW cylinder with thermostat
5
DHW
ON
DHW
OFF
CYL.
CH1
230V~
CH2
2
1
L
N L
L
16A
3
9
BUS
16A
3-port valve electrical connections:
10
BUS
NTC
+
-
2
1
BUS
1
2
0020140122_02 - 05/13
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