Internal Extensions - Viessmann Vitodens 222-F B2TA Installation And Service Instructions Manual

Function description

Internal extensions

Internal extension H1
The internal extension is integrated into
the control unit casing. The following
alternative functions can be connected
to relay output sK. The function is
assigned via coding address "53" in
group "General":
■ Central fault message (code "53:0")
■ DHW circulation pump (code "53:1")
(only for weather-compensated oper-
ation)
152
■ Heating circuit pump for heating circuit
without mixer (code "53:2")
■ Circulation pump for cylinder heating
(code "53:3")
An external safety valve can be connec-
ted to connection gD.