External Extensions For External Connections (Accessories) - Viessmann Vitodens 333-F Service Instructions Manual

Function description

External extensions for external connections (accessories)

External extension H1
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:
A
ON/OFF switch (on site)
sÖ
Heating circuit pump for the
heating circuit without mixer
sA
Cylinder primary pump
sK
DHW circulation pump (only for
weather-compensated opera-
tion)
fÖ
Power supply
gÖ
Central fault message
106
aVD
& External blocking
(terminals 2 - 3)
& External demand
(terminals 1 - 2)
& External heating program
changeover (terminals 1 - 2)
(only for weather-compen-
sated operation)
The allocation of the function
"External heating program
changeover" is set via coding
address "91".
aVF External set value 0 to 10 V
aVG KM BUS