Viessmann VITODENS 222-F Installation And Service Instructions Manual page 87

Heating circuit 1, heating circuit 2, heating...
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)
A9:7 With pump idle time:
Heating circuit pump
"OFF" if the set value
changes through a
change in operating
mode or through a
change in the set room
temperature (only for
weather-compensated
control units)
(cont.)
Possible change
A6:5 Extended economy control
to enabled, i.e. the burner and
A6:35 heating circuit pump will be
switched OFF and the
mixer closed at a variable
adjustable value between 5
and 35 °C plus 1 °C. 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.
A7:1 With mixer economy func-
tion (extended heating cir-
cuit 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 function
■ If there is a risk of frost
A8:0 Heating circuit with mixer
creates no demand for the
internal circulation pump
A9:0 Without pump idle time
A9:1 With pump idle time;
to adjustable from 1 to 15
A9:15
Code 2
87