Adjust The Heating Curves - Viessmann VITOTRONIC 300 GW2 Installation And Service Instructions Manual

Steps
(continued)

10. Adjust the heating curves

Normal room
temperature
20
Reduced room
14
temperature
The heating curves represent the relationship between the outdoor temperature
and the boiler water or supply temperature. Put simply: The lower the outdoor
temperature, the higher the boiler water temperature. In turn, the room
temperature is dependent on the boiler water temperature.
Slope
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
Outdoor temperature in °C
1. Set the desired room temperature
Normal room temperature
Set the desired day temperature with
the set-point selector.
Reduced room temperature
Press tm to call up the desired night
temperature; adjust the desired night
temperature with the
button.
Press to confirm the selected
value.
The slope of the heating curve is
normally within the range marked
A for underfloor heating systems
B for modulating heating systems
C for heating systems with boiler
water temperatures over 75°C.
Factory settings:
Slope "n" = 1.4
Shift "N"= 0
See conversion chart on the back
of the manual for °F.
Desired room temperatures can
be set separately for each heating
circuit.
The value is automatically
accepted after approx. 2 seconds.
or
The display changes and shows
the boiler water temperature.
Start-up
71