Internal Extension H2 - Viessmann VITODENS 200-W Service Instructions Manual

Function description
Internal extensions (accessories)
■ Heating circuit pump for a heating cir-
cuit without mixer (coding address
"53:2")
■ Circulation pump for cylinder heating
(coding address "53:3")

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)
120
(cont.)
An external safety valve can be connec-
ted to gD.
■ 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.