Viessmann FB2B Installation And Service Instructions Manual page 19

Electrical connections
Connection of accessories
A
E
A Boiler control unit
B Extension kit for a heating circuit
with mixer M2
C Extension kit for heating circuit with
mixer M3
If a current flows to the actuators con-
nected (e.g. circulation pumps) that is
higher than the safety level of the acces-
sory, only use the output concerned to
control an on-site relay.
Accessories
Extension kit for one heating circuit with mixer
Extension AM1
Extension EA1
Solar control module SM1
Connecting the collector temperature sensor
Note
Solar control module A is attached to
the l.h. side of the air box.
(cont.)
B C
D Extension AM1, EA1 and/or solar
control module SM1
E ON/OFF switch
Internal fuse protection
2 A
4 A
2 A
2 A
Installation sequence
D
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