Vaillant VR 66/2 - 3.2.4 Monozone Mode with Two 2-Port Valves

EN
0020140122_03 - 12/19 - Vaillant
SAFETY
- 7 -
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.
9
10
1
2
6
4 3
6
DHW cylinder with temperature sensor DHW cylinder with thermostat
Key
1 Room thermostat
2 System boiler
3 DHW valve - 2-port valve
4 Heating 2-port valve
5 Electrical supply
6 VR 66/2 control centre
7 Bypass necessary with open vent boilers
8 Domestic hot water cylinder
9 Temperature sensor (not supplied)
10 Cylinder thermostat
11 Heating circuit
12 Overheating safety (if underfloor heating)
A Boiler circuit return
B Boiler circuit flow
C Cold water supply
D Domestic hot water outlet