Operating instructions

External e xtension H1
The external extension is connected
to the boiler control unit via the KM
BUS. The follo wing functions can b e
controlled or processed via this exten-
sion:
sÖ Heating circuit pump for heating
circuit without mixer
sK DHW circulation pump
fÖ Power supply
gÖ Central fault message
aVD
&
External bloc king
(termina ls 2 - 3)
&
External demand
(termina ls 1 - 2)
&
External operating m ode chan-
geover (terminals 1 - 2)
aVF Externalsetvalue0to10V
aVG KM BUS
The allocation of function External
changeover of operating mode is
selected via c oding addres s 91.
Extensions for external connections (accessory) (cont.)
101
Function description
5692 548 GB