External Blocking - Viessmann Vitocrossal 100 Series Service Instructions For Contractors

Control functions
(cont.)
Operating program changeover
Changeover via input DE1
Changeover via input DE2
Changeover via input DE3
You can select which direction the operating program
changeover takes in coding address "d5":
Operating program changeover
Changeover towards "Permanently reduced" or "Permanent standby mode" (ac-
cording to the selected set value)
Changeover towards "Continuous heating mode"
The duration of the operating program changeover can
be adjusted in coding address "F2":
Operating program changeover
No operating program changeover
Duration of the operating program changeover 1 to 12 h
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".
External blocking
Input DE1
Input DE2
Input DE3
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:
Function description
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
109