Vaillant VR 66 Installation Instructions Manual page 12

INTRODUCTION
3.2.7 Multizone mode with combi boiler
2
Key
1 VRT350 thermostat "zone 1"
2 Combi boiler
3 VRT350 thermostat "zone 2"
4 Connection block (not supplied)
EN
5 Heating zone 2- 2-port valve
6 Heating zone 1- 2-port valve
7 Electrical supply
8 VR66 control unit
9 Heating circuit zone 1
10 Heating circuit zone 2
11 Overheating safety (if underfl oor heating)
- 10 -
0
8
EBUS
7
C
D
A
B
230V~
7
16A
3
EBUS
EBUS
11
8
ON OFF
DHW DHW
CH1
CYL. BUS
CH2
+
2 1
N L N L
5 6
BUS
BUS
2
16A
A Boiler circuit return
B Boiler circuit fl ow
C Cold water supply
D Domestic hot water outlet
1
5
3
6
NTC
- 1
2
4
BUS
1
9
10
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