Operating instructions

External e xtension H2 (accessories)
The external extension is connected
to the boiler control unit via the KM
BUS. The follo wing functions can b e
controlled or processed simulta-
neously via the extension:
A Mains isolator (on site)
sK DHW circulation pump
fÖ Power supply
aVD
&
External bloc king
(termina ls 2 - 3)
&
External demand
(termina ls 1 - 2)
&
External heating program
changeover (terminal 1 - 2)
The allocation of function
"External heating program
changeover" is set via coding
address "91".
aVG KM BUS
Extensions for external connections (cont.)
98
Function description
5692 619 GB