Viessmann Vitodens 200 Service Instructions Manual page 51

Code 2
(cont.)
Coding in the delivered condition
Boiler circuit, mixer circuit
A6:36 Extended economy
function disabled (only
for weather-compen-
sated control units)
A7:0 Without mixer economy
function (only for weath-
er-compensated control
units)
A8:1 Heating circuit with
mixer M2 creates a de-
mand for the internal
circulation pump (only
for weather-compen-
sated control units)
Possible change
A6:5 Extended economy mode
to is enabled, i.e. the burner
A6:35 and heating circuit pump
will be switched OFF and
the mixer will be closed at
a variable value, which is
adjustable between 5 and
35 °C plus 1 °C. This
value is based on the ad-
justed outside tempera-
ture, comprising the
actual outside tempera-
ture and a time constant,
which takes the cooling
down of an average
building into considera-
tion.
A7:1 With mixer economy
function (extended heat-
ing circuit pump logic):
Heating circuit pump also
"OFF" if the mixer was
closed longer than
20 min. Heating pump
"ON":
If the mixer changes to
control mode
or
If there is a risk of frost
A8:0 Heating circuit with mixer
M2 creates no demand
for the internal circulation
pump
Coding
51