External Connections On Plug Avd - Viessmann VITOTRONIC 200-H Installation And Service Instructions Manual

External connections on plug aVD

143
Dry contacts
A External heating program
changeover
External mixing valve open
B External mixing valve close
Manually pre-selected
heating program
(with open contact)
9 Space heating OFF d5: 0
or
r
Space heating ON
A
B
Code 2
<–> Constant operation with reduced room temperature
(factory default setting)
d5: 1 <–> Constant operation with normal room temperature
External heating program changeover or mixing valve open
The manually pre-selected heating program can be modified
via this contact (see table below), and the mixing valve can
be opened.
Set coding addresses 91 and 9A.
External mixing valve close
Closing the dry contact closes the mixing valve.
Set coding address 99.
The mixing valve close function has priority over mixing
valve open.
¨ The heating circuit is no longer protected from frost
when the mixing valve closes.
Changed heating program
(with closed contact)
Installation
13