Viessmann VITODENS 300 Service Instructions Manual page 99
Wall mounted gas fired condensing boiler. natural gas and lpg version. 4.2 to 13.0 kw
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Also See for VITODENS 300:
- Service instructions manual (132 pages) ,
- Datasheet (41 pages) ,
- Installation instructions manual (20 pages)
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Extensions for external connections . . .
External extension H2
The external extension is connected
to the boiler control unit via the KM
BUS. The following functions can be
controlled or processed simulta-
neously via the extension:
sK
DHW circulation pump
fÖ
Power supply
Function description
(cont.)
aVD
External blocking
(terminals 2 - 3)
External demand
(terminals 1 - 2)
External operating mode chan-
geover (terminal 1 - 2)
The allocation of the "External
heating program changeover"
function is selected via coding
address "91".
aVG KM BUS
99
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