External Extension H - Viessmann VITODENs 200 Installation Instructions Manual

Function description
Extensions for external connections (accessory)

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:
sÖ
Heating circuit pump for heating
circuit without mixer
sA
Cylinder loading pump
sK
DHW circulation pump
fÖ
Power supply
gÖ
Central fault message
102
aVD
&
External blocking
(terminals 2 - 3)
& External demand
(terminals 1 - 2)
&
External changeover of the
operating mode (terminals 1 -
2)
The allocation of function
"External changeover of oper-
ating mode" is selected via
coding address 91.
aVF External set value 0 to 10 V
aVG KM BUS
(cont.)