Viessmann Vitodens 222-F B2TA Installation And Service Instructions Manual page 159

Control functions
You can select which direction the heat-
ing program changeover takes in coding
address "d5" in the "Heating circuit"
group:
Heating program - changeover
Changeover towards "Permanently reduced" or "Permanent
standby" mode (subject to the selected set value)
Changeover towards "Constant heating mode"
The duration of the heating program
changeover is set via 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 "External blocking" and "External
blocking and fault message input" func-
tions are connected via extension EA1.
There are 3 inputs available at extension
EA1 (DE1 to DE3).
External blocking
Input DE1
Input DE2
Input DE3
(cont.)
The function is selected via the following
coding addresses in the "General"
group:
Function description
Code
d5:0
d5:1
Code
F2:0
F2:1 to
F2:12
Code
3A:3
3b:3
3C:3
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