Control Functions - Viessmann VITODENS 200-W Service Instructions Manual

External extensions (accessories)
Output aBJ
The following functions can be connec-
ted to output aBJ:
■ Feed pump to substation
or
■ DHW circulation pump
or
■ Fault message facility

Control functions

External heating program changeover
The "External heating program change-
over" function is connected via extension
EA1. There are 3 inputs available at
extension EA1 (DE1 to DE3).
Heating program changeover
Input DE1
Input DE2
Input DE3
Assign the heating program changeover
function for the respective heating circuit
via code d8 at the boiler control unit:
Heating program changeover
Changeover via input DE1
Changeover via input DE2
Changeover via input DE3
You can select which direction the heat-
ing program changeover takes in coding
address "d5":
Function description
(cont.)
Function assignment
Select the function of output aBJ via
code 36 at the boiler control unit.
The function is selected via the following
codes:
Code
3A:1
3b:1
3C:1
Code
d8:1
d8:2
d8:3
125