Viessmann VITODENS 222-F Installation And Service Instructions Manual page 18

Installation sequence
Electrical connections
Connection of accessories
Power supply of all accessories via the boiler control unit
A
E
Some accessories with direct power supply
A
E
A Boiler control unit
B Extension kit for heating circuit with
mixer M2
C Extension kit for heating circuit with
mixer M3
If the current flowing to the connected
working parts (e.g. circulation pumps) is
higher than the safety level of the acces-
sory, the output concerned should only
be used to control an on-site relay.
18
(cont.)
B C
B C
D Extensions AM1 or EA1
E ON/OFF switch
Accessories
Extension kit for heat-
ing circuit with mixer
Extension AM1
Extension EA1
D
D
Internal fuse
protection
2 A
4 A
2 A