Operating instructions

Internal extension H1
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 a heating
circuit without mixer (coding
address "53:2")
&
Cylinder primary pump (coding
address "53:3")
An external safety valve can be con-
nected to gD.
Extensions for external connections (accessories)
94
Function description
5692 672 GB