Selecting The Boiler Sequence At The Vitotronic 300 - Viessmann VITOTRONIC 300 Installation And Service Instructions Manual

Integrating the control unit into LON
Successfully checked subscribers are indicated by
■
"Check OK".
■ Unsuccessfully checked subscribers are indicated by
"Check not OK".
Use to refresh the subscriber list in order to carry
out another subscriber check.

Selecting the boiler sequence at the Vitotronic 300

Tap the following buttons:
1.
2. "Boiler sequence"
Following parameters in "Cascade" group can influence the boiler sequence:
Function
"Lead boiler or boiler sequence changeover"
"Permanent lead boiler"
"Permanent last boiler"
"ECO threshold boiler"...
■ Every boiler can be blocked or enabled subject to
outside temperature by means of the ECO threshold.
■ The ECO threshold has no effect if a boiler is
required to achieve the set flow temperature in the
case of enabled boilers failing.
At least the lead boiler remains in operation when all
■
boilers in a system would otherwise be blocked by
the ECO threshold.
Adjusting the heating curve
The heating curves represent the relationship between
the outside temperature and the boiler water or flow
temperature.
More simply: The lower the outside temperature, the
higher the boiler water or flow temperature.
The boiler water or flow temperature in turn affects the
room temperature.
(cont.)
3. Select the required boiler sequence. Use
confirm.
Settings in the delivered condition:
Slope = 1.4
■
Level = 0
■
Commissioning
Parameter
20 to 27
to
03
04
05
51