Viessmann Vitodens 300 Service Instructions Manual page 53

Code 2
(cont.)
Coding in Function mode
the as
delivered
condition
Address:
value
A2:2 With DHW cylinder
priority applicable to
heating circuit pump
and mixer
A3:2 * 2 Outside temperature
below 1 °C: Heating cir-
cuit pump ON
Outside temperature
above 3 °C: Heating cir-
cuit pump OFF
Note
When selecting a value
below 1 °C there will be
a risk of pipes outside
the thermal insulation
envelope of the house
freezing-up. The
standby mode, in parti-
cular, should be
observed, e.g. during
holidays.
*1
Only adjustable for mixer circuit M2.
*2
Only for weather-compensated control units.
Coding Possible change
change
Address:
value
A2:0 Without DHW cylinder
priority applicable to
heating circuit pump and
mixer
A2:1 With DHW priority applic-
able to mixer: The mixer
is closed whilst DHW is
loaded; the heating cir-
cuit pump operates
A2:3 Reduced priority appl. to
to mixer; i.e. the heating cir-
A2:15 cuit receives a reduced
amount of energy
A3:-9 Heating circuit pump ON/
to OFF (see the following
A3:15 table)
Coding
* 1
* 1
53