Viessmann VITODENS 242-F Installation And Service Instructions Manual page 113

"Heating circuit ..."
Coding in the delivered condition
A6:36 Extended economy mode
disabled
A7:0 Only for heating circuit
with mixer:
Without mixer economy
function
A8:1 Heating circuit with mixer
creates a demand for the
internal circulation pump
A9:7 With pump idle time:
Heating circuit pump
"OFF" if set value is modi-
fied by changing the op-
erating mode or changing
the set room tempera-
ture
b0:0 Only for heating circuit
with mixer and remote
control:
(cont.)
Possible change
A6:5
to
A6:35
A7:1
A8:0
A9:0
A9:1
to
A9:15
b0:1
Code 2
Extended economy control
enabled, i.e. the burner and
heating circuit pump stop
and the mixer is closed at a
variable value, adjustable
between 5 and 35 °C plus
1 °C. The base value is the
adjusted outside tempera-
ture. This value is based on
the actual outside temper-
ature and a time constant
which takes into account
the cooling down of an
average building.
With mixer economy func-
tion (extended heating cir-
cuit pump logic):
Heating circuit pump also
"OFF":
■ If the mixer has been
closed for longer than
20 min.
Heating circuit pump
"ON":
■ If the mixer changes to
control function
■ If there is a risk of frost
Heating circuit with mixer
creates no demand for the
internal circulation pump
Without pump idle time
With pump idle time, ad-
justable from 1 to 15.
1 = short idle time
15 = long idle time
Heating mode: Weather-
compensated
Reduced mode: With room
temperature hook-up
113