Viessmann VITODENS 300 WB3A, Service Instructions Manual

Page: 72 / 148

Coding in
the as
delivered
condition
Address:
value Function mode Coding
change
Address:
value Possible change
Boiler circuit, mixer circuit
A6:36
* 1
Extended economy
circuit inactive
A6:5
to
A6:35 Extended economy cir-
cuit enabled, i.e. the bur-
ner 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 adjusted outside
temperature, comprising
the actual outside tem-
perature and a time con-
stant, which takes the
cooling down of an aver-
age building into consid-
eration.
A7:0
* 1
Without mixer econ-
omy function
A7:1 With mixer economy
function (extended heat-
ing circuit pump logic):
Heating circuit pump also
OFF, if the mixer was
closed for longer than
20 minutes. Heating
pump ON,
&
if the mixer changes to
control mode
or
&
after cylinder loading
(for 20 min.)
or
&
if there is a risk of frost.
Code 2
(cont.)
56
Coding
56
92
550
GB
*1
Only for weather-compensated control units.