87
The duration of the operating program changeover can
be adjusted in coding address "F2":
Operating program changeover Code
No operating program changeover F2:0
Duration of the operating program changeover 1 to 12 h 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
When the contact is closed, the burner is switched off.
The heating circuit pump and (if installed) circulation
pump for cylinder heating are switched according to
the set codes.
The external connection is switched via a floating con-
tact.
Connection options:
■
Plug
lH
■
EA1 extension (accessories)
Plug
lH
■
The function is selected via code "4b:2" in the "Gen-
eral"/1 group.
■
The effect on the circulation pump for cylinder heat-
ing is selected with code "5E" "DHW"/3.
■
The effect on the relevant heating circuit pump is
selected with code "d6" "Heating circuit".
EA1 extension
The functions "External blocking" and "External block-
ing with 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 codes:
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
External demand
When the contact is closed, burner operation is load-
dependent. The boiler water is heated to the set value
selected in coding address "9b" in the "General"/1
group. The boiler water temperature is limited by this
set value and by the electronic maximum limit (coding
address "06" in the "Boiler"/2 group).
The external connection is switched via a floating con-
tact.
Connection options:
■
Plug
lH
■
EA1 extension (accessories)
Function description
Control functions (cont.)
5839829
Functions
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