Viessmann VITODENS 242-F Installation And Service Instructions Manual page 36

Installation sequence
Electrical connections
Power supply to all accessories via heat source control unit
A
E
Some accessories with direct power supply
A
E
A Heat source control unit
B Extension kit for heating circuit with
mixer M2
C Extension kit for heating circuit with
mixer M3
The output concerned should only be
used to control an on-site relay if the cur-
rent flowing to the connected working
parts (e.g. circulation pumps) is higher
than the safety level of the relevant
accessory.
36
(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