Vaillant VR 66 - Monozone mode: Open vent or system boiler with DHW cylinder, 3-Port Valve

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INTRODUCTION
0020140122_02 - 05/13
EN
3.2.3 Monozone mode : Open vent or system boiler with DHW cylinder, 3-Port Valve
EBUS
EBUS
1
2
-
+
BUS
NTC
L N L L
16A
230V~
CYL.
DHW
CH1
CH2
21
BUS
16A
NL
BUS
ON
DHW
OFF
1m min.
1
2
-
+
BUS
NTC
L N L L
16A
230V~
CYL.
DHW
CH1
CH2
21
ON
DHW
OFF
1
1
BUS
16A
NL
BUS
10
9
5
2
A
B
11
9
8
7
5
3
4
6
4
1
C
D
5
3
1
2
4
4
9
1
2
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
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
DHW cylinder with NTC DHW cylinder with thermostat
3-port valve electrical connections:
∙ 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.