Control Functions - Viessmann Vitodens 200 Service Manual

Function description

Control functions

External changeover of operating mode
The "Ext. changeover of operating
mode" function is connected via exter-
nal extension input aVD. With coding
address 91 you can select the heating
circuit to which the changeover of
operating mode should apply:
Coding
91:0
91:1
91:2
91:3
With coding address d5, you can
select in which direction the change-
over should be made for each heating
circuit:
Coding
d5:0
d5:1
You can select the duration of the
operating mode changeover with cod-
ing address F2.
Coding
F2:0
F2:1 to
F2:12
The changeover of operating mode
remains active for as long as the con-
tact remains closed, but no less than
the default duration selected with cod-
ing address F2.
104
Changeover of operating mode affects:
No changeover
Heating circuit without mixer A1
Heating circuit with mixer M2
Heating circuit without mixer and heating
circuit with mixer
Changeover of operating mode affects:
Changeover towards "Constantly reduced"
or "Constant standby mode" (subject to
the selected set value)
Changeover towards "Constant heating
mode"
Changeover of operating mode affects:
No changeover of operating mode
Duration of the operating mode change-
over 1 to 12 hours