Viessmann Vitodens 333 Service Instructions Manual page 55

Code 2
(cont.)
Coding in the delivered condition
Heating circuit A1/M2
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 func-
to tion enabled, i.e. the
A6:35 burner 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 adjusted outside
temperature, comprising
the actual outside tem-
perature and a time con-
stant, which takes the
cooling down of an aver-
age building into consid-
eration.
A7:1 With mixer economy
function (extended heat-
ing circuit pump logic):
Heating circuit pump also
"OFF":
If a mixer has been
closed for longer than
20 min.
Heating pump "ON":
If the mixer changes to
control mode
After cylinder heating
(for 20 min)
If there is a risk of frost
A8:0 Heating circuit M2 cre-
ates no demand for the
internal circulation pump
Coding
55