Viessmann VITOPEND 200 Installation And Service Instructions Manual page 102

Function description
Extension 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:
sÖ
Heating circuit pump for the
heating circuit without mixer
fÖ
Power supply
gÖ
Central fault message
102
(cont.)
aVD
&
External blocking
(terminals 2 ‐ 3)
&
External demand
(terminals 1 ‐ 2)
&
External heating program
changeover (terminal 1 ‐ 2)
The allocation of the "External
heating program changeover"
function is selected via coding
address "91".
aVF External set value 0 to 10 V
aVG KM BUS