Control Functions; External Operating Program Changeover; External Blocking - Viessmann Vitodens 242-F Installation And Service Instructions Manual

Function description

Control functions

External operating program changeover

The "External operating program changeover" function
is implemented via the EA1 extension. There are 3
inputs available at the EA1 extension (DE1 to DE3).
Heating program changeover
Input DE1
Input DE2
Input DE3
Select the operating program changeover function for
the respective heating circuit at the boiler control unit,
via coding address "d8" in the "Heating circuit"
group:
Heating program changeover
Changeover via input DE1
Changeover via input DE2
Changeover via input DE3
You can select the direction of the operating program
changeover in coding address "d5" in the "Heating
circuit" group:
Heating program changeover
Changeover towards "Continually reduced" or "Continuous standby mode" (subject
to the selected set value)
Changeover towards "Continuous heating mode"
The duration of the operating program changeover is
set in coding address "F2" in the "Heating circuit"
group:
Heating program changeover
No operating program changeover
Duration of the operating program changeover 1 to 12 hours
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).
External blocking
Input DE1
Input DE2
Input DE3
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The function is selected via the following coding
addresses in the "General" group:
The function is selected via the following coding
addresses in the "General" group:
Code
3A:1
3b:1
3C:1
Code
d8:1
d8:2
d8:3
Code
d5:0
d5:1
Code
F2:0
F2:1 to
F2:12
Code
3A:3
3b:3
3C:3