Internal Extension H2 - Viessmann VITODENS 200-W WB2B Service Instructions For Contractors

Function description
Extensions for external connections . . .
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)

Internal extension H2

92
(cont.)
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.