Vaillant VR 66 - Multizone mode with combi boiler

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INTRODUCTION
0020140122_02 - 05/13
EN
3.2.7 Multizone mode with combi boiler
EBUS
EBUS
EBUS
1
2
-
+
BUS
NTC
N L N L
16A
230V~
CYL.
DHW
CH1
CH2
21
BUSBUS
16A
NL
BUS
ON
DHW
OFF
0
0
10
9
8
2
A
B
D
5
6
11
7
3
8
5 6
123
7
4
1
C
Key
1 VRT350 thermostat "zone 1"
2 Combi boiler
3 VRT350 thermostat "zone 2"
4 Connection block (not supplied)
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)
A Boiler circuit return
B Boiler circuit fl ow
C Cold water supply
D Domestic hot water outlet