Viessmann Vitocrossal 300 Service Instructions For Contractors page 86

Code 2
Heating circuit 1, heating circuit 2, heating...
Parameter address
A5:...
1
2
3
4
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)
86
With heating circuit pump logic function: Heating cir-
cuit pump "Off"
AT > RT + 5 K
set
AT > RT + 4 K
set
AT > RT + 3 K
set
AT > RT + 2 K
set
AT > RT + 1 K
set
AT > RT
set
AT > RT - 1 K
set
AT > RT - 9 K
set
Possible change
A6:5
to
A6:35
A7:1
(cont.)
Extended economy control
enabled, i.e. the burner and
heating circuit pump will be
stopped and the mixer
closed at a variable value,
adjustable between 5 and
35 °C plus 1 °C. The 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.
With mixer economy func-
tion (extended heating cir-
cuit pump logic):
Heating circuit pump also
"Off":
■ If the mixer has been
attempting to close for
longer than 20 min.
Heating circuit pump "On":
■ If the mixer changes to
control function
■ If there is a risk of frost