External Blocking; External Demand; Venting Program; Fill Program - Viessmann Vitodens 222-F Installation And Service Instructions For Contractors

Control functions
(cont.)
You can select the direction of the operating program
changeover in parameter d5 in the "Heating circuit"
group:
Operating program changeover
Changeover towards "Continually re-
duced" or "Continuous standby mode"
(subject to the selected set value)
Changeover towards "Continuous heat-
ing mode"

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).
The function is selected via the following parameters in
the "General" group:
External blocking
Input DE1
Input DE2
Input DE3

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 parameters in
the "General" group:
External demand
Input DE1
Input DE2
Input DE3

Venting program

During the venting program, the circulation pump will
be alternately switched on and off for 30 s over a
period of 20 min.
The 3-way diverter valve alternates for a certain period
between heating and DHW heating. The burner is
switched off during the venting program.

Fill program

In conjunction with the commissioning assistant, the
system can be filled completely. The 3-way diverter
valve is in its central position.
The duration of the operating program changeover is
set in parameter F2 in the "Heating circuit" group:
Operating program changeover
Parameter
No operating program changeover
d5:0
Duration of the operating program
changeover 1 to 12 hours
d5:1
The operating program changeover is enabled for as
long as the contact is closed. As a minimum, it is ena-
bled until the time set in parameter F2 has expired.
External blocking and fault message
input
Input DE1
Input DE2
Input DE3
The effect on the internal circulation pump is selected
Parameter
in parameter 3E in the "General" group.
3A:3
The effect on the relevant heating circuit pump is
3b:3
selected in parameter d6 in the "Heating circuit"
3C:3
group.
The effect on the internal circulation pump is selected
in parameter 3F in the "General" group.
The effect on the relevant heating circuit pump is
selected in parameter d7 in the "Heating circuit"
group.
The set minimum boiler water temperature for external
demand is selected in parameter 9b in the "General"
Parameter
group.
3A:2
3b:2
3C:2
Activating the venting program: See "Venting the heat-
ing system".
Function description
Parameter
F2:0
F2:1 to
F2:12
Parameter
3A:4
3b:4
3C:4
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