External Extension H - Viessmann VITODENS 200-W Service Instructions Manual

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)

External extension H1

The external extension is connected
to the boiler control unit via the KM
BUS. The following functions can be
controlled or processed simulta-
neously via the extension:
96
(cont.)
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.
A ON/OFF switch (on site)
sÖ Heating circuit pump for the
heating circuit without mixer
sA Cylinder primary pump
sK DHW circulation pump (only for
weather-compensated opera-
tion)