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External connections on plug aVD
B
A
5
4
3
2
X6
Note:
Refer to job-specific Vitocontrol-C schematic
Dry contacts (potential free)
A External heating program changeover/
External "Mixing valve open"
B External "Mixing valve closed"
Manually preselected
heating program
(with contact open)
Central heating
9
OFF/DHW OFF
or
Central heating
w
OFF/DHW ON
or
rw Central heating
ON/DHW ON
Power supply
Refer to job-specific Vitocontrol-C schematic for power supply requirements.
1
Code 2
Changed heating program
(with closed contact)
d5:0
<–> Permanent operation with reduced room temperature/DHW OFF
(as factory
default
setting)
d5:1
<–> Constant operation with standard room temperature/DHW in accordance
with coding address "64"
External contacts A and B are connected to aVD (X6) on
module A2 as shown in this diagram and, if applicable, on
the job-specific Vitocontrol-C schematic.
External heating program changeover/ External "Mixing valve
open"
The manually preselected heating program can be modified
via this contact (see table below), and the mixing valve can
be opened.
Allocation to the heating circuits via coding addresses "91"
and "9A".
External "Mixing valve closed"
Closing the contact closes the mixing valve.
Allocation to the heating circuits via coding address "99".
The function "mixing valve closed" has priority over "mixing
valve open".
!
Please note
The heating circuit is no longer protected from frost
when the mixing valve closes.
Installation
11
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