Operating instructions

142
Internal extension H1
The internal extension is integrated into
the control unit casing. The following
alternative functions can be connected
to relay output
sK
. The function is
assigned via coding address "53" in
group "General":
■ Central fault message (code "53:0")
■ DHW circulation pump (code "53:1")
(only for weather-compensated oper-
ation)
■ Heating circuit pump for heating circuit
without mixer (code "53:2")
■ Circulation pump for cylinder heating
(code "53:3")
An external gas isolation valve can be
connected to connection
gD
.
Function description
Internal extensions (accessories)
5772 909 GB