Viessmann C3TB, Installation And Service Instructions For Contractors

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Heating program changeover Code
Changeover via input DE1 d8:1
Changeover via input DE2 d8:2
Changeover via input DE3 d8:3
You can select the direction of the operating program
changeover in coding address "d5" in the
"Heating
circuit" group:
Heating program changeover Code
Changeover towards "Continually reduced" or "Continuous standby mode" (subject
to the selected set value) d5:0
Changeover towards "Continuous heating mode" d5:1
The duration of the operating program changeover is
set in coding address "F2" in the
"Heating circuit"
group:
Heating program changeover Code
No operating program changeover F2:0
Duration of the operating program changeover 1 to 12 hours F2:1 to
F2:12
The operating program changeover stays enabled for
as long as the contact remains closed, but at least as
long as the duration selected in coding address "F2".
External blocking
The functions "External blocking" and "External block-
ing and fault message input" are implemented via the
EA1 extension. There are 3 inputs available at the EA1
extension (DE1 to DE3). The function is selected via the following coding
addresses in the
"General" group:
External blocking Code
Input DE1 3A:3
Input DE2 3b:3
Input DE3 3C:3
External blocking and fault message input Code
Input DE1 3A:4
Input DE2 3b:4
Input DE3 3C:4
The effect on the internal circulation pump is selected
in coding address "3E" in the
"General" group.
The effect on the relevant heating circuit pump is
selected in coding address "d6" in the
"Heating cir-
cuit" group.
External demand
The "External demand" function is implemented via the
EA1 extension. There are 3 inputs available at the EA1
extension (DE1 to DE3). The function is selected via the following coding
addresses in the
"General" group:
Function description
Control functions
(cont.)
5775 636 GB
Functions