Vaillant VR 66 - Monozone mode: Open vent or system boiler with DHW cylinder: two 2-Port Valves

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INTRODUCTION
EN
0020140122_02 - 05/13
3.2.4 Monozone mode : Open vent or system boiler with DHW cylinder : two 2-Port Valves
EBUS
EBUS
1
2
-
+
BUS
NTC
N L N L
16A
230V~
CYL.
DHW
CH1
CH2
21
ON
DHW
OFF
6
4 3
5
1
2
-
+
BUS
NTC
N L N L
16A
230V~
CYL.
DHW
CH1
CH2
21
ON
DHW
OFF
1
1
BUS
16A
NL
BUS
BUS
16A
NL
BUS
1
2
11
6
2
8
3
A
B
9
10
4
127
5
1
C
D
1m min.
10
10
1
2
6
4 3
6
Key
1 Room thermostat
2 System boiler
3 DHW valve - 2-port valve
4 Heating 2-port valve
5 Electrical supply
6 VR66 control unit
7 Bypass necessary with open vent boilers
8 Domestic hot water cylinder
9 NTC (not supplied)
10 Cylinder thermostat
11 Heating circuit
12 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