Vaillant VR 66 - Multizone mode: Open vent or system boiler with DHW cylinder

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INTRODUCTION
EN
0020140122_02 - 05/13
3.2.6 Multizone mode : Open vent or system boiler with DHW cylinder
EBUS
EBUS
1
2
-
+
BUS
NTC
N L
N L N L
EBUS
16A
1
2
-
+
BUS
NTC
N L
N L N L
230V~
CYL.
21
16A
230V~
CYL.
21
BUSBUS
16A
NL
BUS
BUSBUS
16A
NL
BUS
DHW
CH1
CH2
ON
DHW
OFF
0
0
16
15
10
10
2
12
7
A
B
5
13
613
7
6
8
8
1411
9
1
9
10
6
7 8 5
123
123
9
4 4
C
D
3
1m min.
DHW
CH1
CH2
ON
DHW
OFF
Key
1 VRT350 room thermostat "zone 1"
2 Open vent or system boiler
3 VRT350 room thermostat "zone 2"
4 Connection block (not supplied)
5 NTC (not supplied)
6 Heating zone 2 - 2-port valve
7 DHW valve - 2-port valve
8 Heating zone 1 - 2-port valve
9 Electrical supply
10 VR66 control unit
11 Bypass necessary with open vent boilers
12 Domestic hot water cylinder
13 Cylinder thermostat
14 Overheating safety (if underfl oor heating),
as far as possible or 1m min. of cylinder connection
15 Heating circuit zone 1
16 Heating circuit zone 2
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