Control Functions - Viessmann Vitodens 200-W Installation And Service Instructions Manual

Function description
External extensions (accessories)
Analogue input 0 - 10 V
The 0 - 10 V hook-up provides an addi-
tional set boiler water temperature:
0 - 1 V taken as "no default for set boiler
water temperature"
≙ set value 10 °C
1 V
≙ set value 100 °C
10 V
Ensure DC separation between the earth
conductor and the negative pole of the
on-site voltage source.

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
Select the heating program changeover
function for the respective heating circuit
via coding address "d8" in the "Heating
circuit" group at the boiler control unit:
Heating program - changeover
Changeover via input DE1
Changeover via input DE2
Changeover via input DE3
152
(cont.)
Output aBJ
The following functions can be connec-
ted to output aBJ:
■ Feed pump to substation
or
■ DHW circulation pump
or
■ Fault message facility
Function assignment
Select the function of output aBJ via cod-
ing address "36" in the "General" group
at the boiler control unit.
The function is selected via the following
coding addresses in the "General"
group:
Code
3A:1
3b:1
3C:1
Code
d8:1
d8:2
d8:3