120
■ Heating circuit pump for a heating cir-
cuit without mixer (coding address
"53:2")
■ Circulation pump for cylinder heating
(coding address "53:3")
An external safety valve can be connec-
ted to
gD
.
Internal extension H2
The internal extension is integrated into
the control unit housing. The following
alternative functions can be connected
to relay output
sK
. The function is allo-
cated via coding address "53":
■ Central fault message (coding
address "53:0")
■ DHW circulation pump (coding
address "53:1") (only for weather-
compensated operation)
■ Heating circuit pump for heating circuit
without mixer (coding address "53:2")
■ Circulation pump for cylinder heating
(coding address "53:3")
An extractor can be switched OFF via
connection
aBJ
when the burner starts.
Function description
Internal extensions (accessories)
(cont.)
5692 843 GB