Viessmann Vitodens 222-F B2TA Installation And Service Instructions Manual page 106

Code 2
"Heating circuit ..."/group 5
Coding in the delivered condition
d5:0 With external heating pro-
gram changeover (ob-
serve setting for coding
addresses "3A", "3b" and
"3C" in group "Gener-
al").
Heating program
switches to "Constant
central heating with re-
duced room tempera-
ture" or "Standby mode"
(subject to the settings of
the set reduced room
temperature) (only for
weather-compensated
control units).
d6:0 Heating circuit pump
stays in control mode at
signal "External block-
ing"
d7:0 Heating circuit pump
stays in control mode at
signal "External de-
mand"
d8:0 With extension EA1:
No heating program
changeover.
106
(cont.)
Possible change
d5:1
d6:1
d6:2
d7:1
d7:2
d8:1
d8:2
The heating program
changes to "Constant op-
eration with standard room
temperature".
Heating circuit pump stops
at signal "External block-
ing" (subject to coding ad-
dresses "3A", "3b" and
"3C")
Heating circuit pump starts
at signal "External block-
ing" (subject to coding ad-
dresses "3A", "3b" and
"3C")
Heating circuit pump stops
at signal "External de-
mand" (subject to coding
addresses "3A", "3b" and
"3C")
Heating circuit pump starts
at signal "External de-
mand" (subject to coding
addresses "3A", "3b" and
"3C")
Heating program change-
over via input DE1.
Heating program change-
over via input DE2.