Viessmann Vitodens 333 Service Instructions Manual page 101
Compact gas fired condensing boiler natural gas and lpg version
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Also See for Vitodens 333:
- Service instructions manual (132 pages) ,
- Instruction manual (16 pages) ,
- Technical manual (180 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
Mains power supply
Function description
(cont.)
aVD
&
External blocking
(terminals 2 - 3)
&
External demand
(terminals 1 - 2)
&
External operating mode chan-
geover (terminals 1 - 2)
The allocation of the "External
operating mode changeover"
function is selected via coding
address 91.
aVG KM BUS
101
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