Operating instructions

External extension H2
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)
sK DHW circulation pump (only for
weather-compensated opera-
tion)
fÖ Power supply
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".
aVG KM BUS
Extensions for external connections . . . (cont.)
97
Function description
5692 672 GB