Control Functions; External Operating Program Changeover - Viessmann Vitodens 222-F Installation And Service Instructions For Contractors

Function description
External extensions (accessories)
The effect of the operating program changeover is
selected via parameter/coding address d5 in the
"Heating circuit" group.
The duration of the changeover is set via parameter/
coding address F2 in the "Heating circuit" group.
Effect of external blocking function on the pumps
The effect on the internal circulation pump is selected
via parameter/coding address 3E in the "General"
group.
The effect on the relevant heating circuit pump is
selected via parameter/coding address d6 in the
"Heating circuit" group.
The effect on a circulation pump for cylinder heating is
selected via parameter/coding address 5E in the
"DHW" group.
Effect of the external demand function on the
pumps
The effect on the internal circulation pump is selected
via parameter/coding address 3F in the "General"
group.
The effect on the relevant heating circuit pump is
selected via parameter/coding address d7 in the
"Heating circuit" group.
The effect on a circulation pump for cylinder heating is
selected via parameter/coding address 5F in the
"DHW" group.
DHW circulation pump runtime for brief operation
The DHW circulation pump is started by closing the
contact at DE1, DE2 or DE3 by means of a pushbut-
ton. The runtime is set via parameter/coding address
"3d" in the "General" group.

Control functions

External operating program changeover

The "External operating program changeover" 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:
Operating program changeover
Input DE1
Input DE2
Input DE3
108
(cont.)
Analogue input 0
The 0 10 V hook-up provides an additional set boiler
–
water temperature:
0 1 V is taken as "No specification for set boiler
–
water temperature".
≙
1 V
≙
10 V
Ensure galvanic separation between the earth conduc-
tor and the negative pole of the on-site power source.
Output
aBJ
The following functions can be connected to output
:
aBJ
■ Feed pump to substation
or
DHW circulation pump
■
or
■ Fault message facility
Information regarding the feed pump
Function only possible in conjunction with a heating
circuit control unit connected via LON.
Information on DHW circulation pumps
Connect DHW circulation pumps with standalone func-
tions directly to the 230 V ∼ supply.
Function assignment
Select the function of output
"36" in the "General" group at the boiler control unit.
Select the operating program changeover function for
the respective heating circuit via parameter d8 in the
"Heating circuit" group at the boiler control unit:
Operating program changeover
Changeover via input DE1
Parameter
Changeover via input DE2
3A:1
Changeover via input DE3
3b:1
3C:1
10 V
–
Set value 10 °C
Set value 100 °C
via coding address
aBJ
Parameter
d8:1
d8:2
d8:3