Control Functions - Viessmann VITOLADENS 300-W Installation And Service Instructions Manual

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 is 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 operating program change-
over 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
Function description
(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
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