Vaillant VR 66/2, Installation Instructions Manual, Page: 9 / 20

Installation instructions 0020140122_04
9
3.2.4 Monozone mode: Open vent or system boiler with DHW cylinder, two 2-Port Valves
9a
BUS BUS BUS BUS BUS BUS BUS BUS
12
BUS
BUS
BUS
M
3
12f
M
3
12f
9e
9b
12f
9b
3
9e
BUS BUS
3 2
BUS
BUS
10e
1
1
2
DHW
8c
8f
5
DHW
1a
3
2
230V ~
12f
38
1
230 V~
3
2
17
230 V~
3
12q
230 V~
3
WLAN LAN
Key
1 Heat generator
1a Back-up heater for domestic hot water
5 Monovalent domestic hot water cylinder
8c Safety assembly for the potable water connection
8f Expansion vessel for potable water
9a Single-room temperature control valve (thermostatic/motor-
ised)
9b Zone valve
9e Diverter valve for potable water
10e Line strainer with magnetite separator
12
System control
12f VR 66/2 control centre
12q Internet gateway (optional)
b
17 Optional component
b
38 If a thermostat shall be used, instead of the DHW tempera-
ture sensor; remove the DHW temperature sensor, mount
the thermostat, and connect the thermostat on clamp ‘CYL’.