Viessmann VITOLADENS 300-C Service Instructions Manual page 81

Control functions
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".
External blocking
The "External blocking" function is
connected via input "aVD".
External demand
The "External demand" function is
connected via input "aVD".
(cont.)
In coding address "32" you can select
the influence the "Ext. blocking" sig-
nal should have on the connected cir-
culation pumps.
Function description
Coding
91:0
91:1
91:2
Coding
d5:0
d5:1
Coding
F2:0
F2:1 to
F2:12
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