Operating instructions

Internal extension H2
The internal extension is integrated
into the control unit housing. The fol-
lowing alternative functions can be
connected to relay output sK. The
function is allocated 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 cir-
cuit without mixer (coding address
"53:2")
&
Cylinder primary pump (coding
address "53:3")
An extractor can be switched OFF via
connection aBJ when the burner
starts.
Extensions for external connections . . . (cont.)
95
Function description
5692 672 GB