Viessmann Vitoplus 300 Service Instructions Manual page 54

Wall mounted oil fired condensing boiler for the combustion of low sulphur fuel oil din 51603-el-1 with integral boiler control unit
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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
54
Possible change
A6:5
Extended economy mode
to
is enabled, i.e. the burner
A6:35
and heating circuit pump
will be switched OFF and
the mixer will be closed at
a variable value, which 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,
which 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
moved to the closed posi-
tion for longer than
20 min. Heating pump
ON,
if the mixer changes to
control mode
or
after cylinder heating
(for 20 min)
or
if there is a risk of frost.
A8:0
Heating circuit with mixer
M2 creates no demand
for the internal circulation
pump

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