Viessmann VITODENS 200-W Service Instructions Manual page 75

Heating circuit 1, heating circuit 2, heating...
Parameter address
A5:...
7
to
15
Coding in the delivered condition
A6:36 Extended economy func-
tion disabled (only for
weather-compensated
control units)
A7:0 Without mixer economy
function (only for a
weather-compensated
control unit and heating
circuit with mixer)
A8:1 Heating circuit with mixer
creates a demand for the
internal circulation pump
(only for weather-com-
pensated control units)
With heating circuit pump logic function: Heating cir-
cuit pump "OFF"
AT > RT - 1 K
set
AT > RT - 9 K
set
Possible change
A6:5
to
A6:35
A7:1
A8:0
(cont.)
Extended economy control
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 out-
side 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
Heating circuit with mixer
creates no demand for the
internal circulation pump
Code 2
75