External Blocking; External Demand - Viessmann Vitoladens 300-W Installation And Service Instructions For Contractors

Control functions
(cont.)
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
External blocking and fault message input
Input DE1
Input DE2
Input DE3
The effect on the internal circulation pump is selected
in coding address "3E" in the "General" 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:
The effect on the relevant heating circuit pump is
selected in coding address "d6" in the "Heating cir-
cuit" group.
The function is selected via the following coding
addresses in the "General" group:
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
Code
3A:4
3b:4
3C:4
97