Viessmann VITOLADENS 300-W Installation And Service Instructions Manual page 84

Code 2
Heating circuit 1, heating circuit 2, heating...
Parameter address
A5:...
5
6
7
to
15
Coding in the delivered condition
A6:36 Extended economy mode
disabled
A7:0 Without mixer economy
function (only for heating
circuits with mixer)
A8:1 Heating circuit with mixer
creates a demand for the
internal circulation pump
(only for systems without
low loss header)
84
With heating circuit pump logic function: Heating cir-
cuit pump "OFF"
OT > RT + 1 K
set
OT > RT
set
OT > RT - 1 K
set
OT > RT - 9 K
set
Possible change
A6:5
to
A6:35
A7:1
A8:0
(cont.)
Extended economy control
enabled, i.e. the burner and
heating circuit pump will
stop and the mixer close 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 the cooling
down of an average build-
ing into consideration
With mixer economy func-
tion (extended heating cir-
cuit pump logic):
Heating circuit pump also
"OFF":
■ If the mixer has been at-
tempting to close for lon-
ger 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