Vaillant VR 66 Installation Instructions Manual page 9

3.2.4 Monozone mode : Open vent or system boiler with DHW cylinder : two 2-Port Valves
6
EBUS
2
DHW cylinder with NTC
CH1
CYL.
230V~
2 1
N L
5
16A
4
16A
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)
0020140122_02 - 05/13
EBUS
1
D
8
5
9
10
A
7
B
6
ON OFF
DHW DHW
BUS NTC
CH2
- 1
+ 2
N L
10
3
BUS
BUS
1
2
C
3
12
1m min.
CYL.
230V~
2
6
16A
10
A Boiler circuit return
B Boiler circuit fl ow
C Cold water supply
D Domestic hot water outlet
INTRODUCTION
1
4
DHW cylinder with thermostat
6
ON OFF
DHW DHW
CH1
BUS
CH2
-
+
1
N L N L
4 3
BUS
2
16A
11
NTC
1
2
BUS
1
EN
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