Viessmann VITODENS 200-W WB2B Service Instructions For Contractors page 53

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 circulation
pump in the heating cir-
cuit connection set
(only for weather-com-
pensated control units)
Possible change
A6:5 Extended economy mode
to is enabled, i.e. the burner
A6:35 and heating circuit pump
are switched OFF and
the mixer will be closed at
a variable value that 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
that 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
After cylinder heating
(for 20 min)
or
If there is a risk of frost
A8:0 Heating circuit with mixer
M2 creates no demand
for the circulation pump
in the heating circuit con-
nection set
Coding
53