Viessmann Vitodens 200-W Installation Instructions Manual page 100

Code 2
Heating circuit 1, heating circuit 2, heating...
Coding in the delivered condition
A7:0 Without mixer economy
function
Only for a weather-com-
pensated control unit and
heating circuit with mixer
A8:1 Heating circuit with mixer
creates a demand for the
boiler circuit pump (only
for weather-compensa-
ted control units)
A9:7 With pump idle time:
heating circuit pump
"OFF" if the set value is
altered through a change
in operating mode or
through a change in the
set room temperature
(only for weather-com-
pensated control units)
100
Possible change
The burner and heating cir-
cuit pump will stop and the
mixer will be closed at a
variable value, adjustable
between 5 and 35 °C plus
1 °C. The base value is the
adjusted outside tempera-
ture. This value is based on
the actual outside temper-
ature and a time constant,
which takes the cooling
down of an average build-
ing into consideration.
A7:1 With mixer economy func-
tion (extended heating cir-
cuit pump logic):
Heating circuit pump also
"OFF":
■ If the mixer has been try-
ing 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
A8:0 Heating circuit with mixer
creates no demand for the
boiler circuit pump
A9:0 Without pump idle time
A9:1 With pump idle time, ad-
to justable from 1 to 15. The
A9:15 higher the value, the longer
the pump idle time.
(cont.)