Extensions For External Connections (Accessories) - Viessmann VITODENS 300 Service Instructions Manual

Function description

Extensions for external connections (accessories)

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 (code 53:0)
Cylinder primary pump (coding
53:3)
96
DHW circulation pump (code 53:1)
Heating circuit pump for a heating
circuit without mixer (code 53:2)
An external safety valve can be con-
nected to gD (do not remove the jum-
per).