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3.2.6
Multizone mode : Open vent or system boiler with DHW cylinder
10
EBUS
2
DHW cylinder with NTC
CH1
230V~
CYL.
2
1
N L
9
16A
6
BUS
3
16A
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
0020140122_02 - 05/13
EBUS
0
EBUS
D
12
9
5
13
A
11
B
10
ON
OFF
DHW
DHW
BUS
NTC
CH2
-
1
+
2
N L
N L
7
8
5
4
BUS
BUS
2
1
C
7
14
1m min.
230V~
9
16A
3
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
INTRODUCTION
3
6
1
8
DHW cylinder with thermostat
10
DHW
ON
DHW
OFF
CYL.
CH1
BUS
CH2
+
2
1
N L
N L
N L
13
6
7
8
BUS
BUS
2
16A
15
16
NTC
-
1
2
4
BUS
1
EN
- 9 -
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