External "Mixing Valve Closed"/"Mixing Valve Open; External Heating Program Changeover - Viessmann VITOTRONIC 200 Installation And Service Instructions Manual

Installation Sequence
External "Mixing Valve Close"/"Mixing Valve Open"
Legend
A External "Mixing valve open" (floating contact)
B External "Mixing valve close" (floating contact)

External Heating Program Changeover

A Floating contact
B Plug avD of the control unit
Legend
A Floating contact
B Extension EA1
The changeover can be separate for heating circuits
1 to 3.
20
Vitotronic 200 and 300-K Installation and Service
Connection at plug avD
The mixing valves are opened A or closed B when
the contact is closed.
Note: 'Live' contacts lead to short circuits or phase
failure.
The external connection must be potential-free.
Codes
External "Mixing valve open"
Via coding address "9A" in the "General" group,
this function is assigned to the heating circuits.
External "Mixing valve close"
Via coding address "99" in the "General" group,
this function is assigned to the heating circuits.
Connection options:
Connection at plug avD
Extension EA1 (accessory, see page 90)
Connection
Note: 'Live' contacts lead to short circuits or phase
failure.
The external connection must be potential-free.
Codes
Plug avD Via coding address "91" in the "General"
group, the function can be assigned to
the heating circuits.
Extension EA1 Set "5D", "5E" or "5F" in the "General"
group to 1.
Via coding address "D8" in the "Heating
circuit..." group, the function can be
assigned to the heating circuits.