Control Functions - Viessmann VITODENS 343-F WS4A Installation And Service Instructions Manual

Function description

Control functions

External heating program changeover
The "External heating program chan-
geover" function is connected via
external extension input "aVD". You
can select which heating circuits the
heating program changeover affects
in coding address "91":
Heating program changeover
No changeover
Heating circuit without mixer A1
Heating circuit with mixer M2
Heating circuit without mixer and heating circuit with mixer 91:3
You can select which direction the
heating program changes over in cod-
ing address "D5":
Heating program changeover
Changeover towards "Permanently reduced" or "Perma-
nent standby" mode (subject to the selected set value)
Changeover towards "Constant heating mode"
The duration of the heating program
changeover can be adjusted in coding
address "F2":
Heating program changeover
No heating program changeover
Duration of the heating program changeover 1 to 12 hours
The heating program changeover
stays enabled for as long as the con-
tact remains closed, but at least as
long as the duration selected in cod-
ing address "F2".
120
Coding
91:0
91:1
91:2
Coding
d5:0
d5:1
Coding
F2:0
F2:1 to
F2:12