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 via the exten-
sion:
sÖ Heating circuit pump for the
heating circuit without mixer
sA Cylinder primary pump
sK DHW circulation pump
fÖ Power supply
gÖ Fault notification
aVD
&
External blocking
&
(terminals 2 - 3)
&
External demand
&
(terminals 1 - 2)
&
External operating mode chan-
geover (terminal 1 - 2)
&
The allocation of the "External
operating mode changeover"
function is selected via coding
address "91".
aVF External set value 0 - 10 V
aVG KM BUS
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