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Viessmann VITOTRONIC 300 Installation And Service Instructions Manual page 74

Weather-compensated digital boiler and heating circuit control
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Mixer circuit extension kit
Control unit connection
A
C
B
A
B
C
Please note:
Use KM BUS distributor (see page
93) when connecting several BUS
users.
74
Mains electrical connection
A
C
B
A
B
C
Please note:
Use the mains distributor when
using two extension kits (see
page 94).

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