Viessmann VITODENS 343-F WS4A Installation And Service Instructions Manual page 80

Coding
Code 2
(cont.)
Coding in the delivered condition
Boiler circuit, mixer circuit
A6:36 Extended economy
mode disabled
A7:0 Without mixer economy
function
A8:1 Heating circuit with
mixer M2 creates a de-
mand for the internal
circulation pump
A9:7 With pump idle time:
Heating circuit pump
"OFF" in case the set
value is changed by
changing the operating
mode or the set room
temperature
80
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 for
20 min. Heating circuit
pump "ON", if the mixer
changes to control mode.
A8:0 Heating circuit with mixer
M2 (mixer circuit) creates
no demand for the inter-
nal circulation pump
A9:0 Without pump idle time
A9:1 With pump idle time; ad-
to justable from 1 to 15
A9:15