Viessmann VITODENS 222-F Installation And Service Instructions Manual page 68

Code 1
Heating circuit 1, heating circuit 2, heating...
Parameter address
A5:...
5
6
7
to
15
Coding in the delivered condition
Extended economy function adjusted outside temperature
A6:36 Extended economy func-
tion disabled (only for
weather-compensated
control units)
Extended economy function mixer
A7:0 Without mixer economy
function (only for a
weather-compensated
control unit and heating
circuit with mixer)
68
With heating circuit pump logic function: Heating cir-
cuit pump "OFF"
AT > RT
+ 1 K
set
AT > RT
set
AT > RT
- 1 K
set
AT > RT
- 9 K
set
Possible change
A6:5
to
A6:35
A7:1
(cont.)
Extended economy func-
tion enabled, i.e. the burner
and heating circuit pump
will be stopped and the
mixer closed at a variable
value, adjustable between
5 and 35 °C plus 1 °C. The
base value is the adjusted
outside temperature. This
value is based on the
actual outside temperature
and a time constant that
takes the cooling down of
an average building into
consideration.
With mixer economy func-
tion (extended heating cir-
cuit pump logic):
Heating circuit pump also
"OFF":
■ If the mixer has been
attempting to close for
longer than 20 min.
Heating circuit pump
"ON":
■ If the mixer changes to
control function
■ If there is a risk of frost