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Vitocrossal 300 CA3 Series 2.5 to 6.0 Installation/Service
Adjusting the Heating Curve
The heating curves represent the relationship between
the outdoor temperature and the boiler water or supply
temperature.
Simplified:
The lower the outdoor temperature, the higher the boiler
water or supply temperature.
The boiler water or supply temperature in turn affects the
room temperature.
Settings in the factory set condition:
H
Slope = 1.4
H
Shift = 0
Example for outdoor temperature 5°F (
−
15°C)
A
Underfloor heating system, slope 0.2 to 0.8
B
Low temperature heating system, slope 0.8 to 1.6
C
Heating systems with a boiler water temperature in
excess of 167°F (75°C), slope greater than 1.6
Legend
A
Boiler water temperature or supply temperature
B
Outdoor temperature
C
Set room temperature
D
Heating circuit pump “Off”
E
Heating circuit pump “On”
Selecting the set room temperature
Individually adjustable for each heating circuit. The
heating curve is offset along the set room temperature
axis. With the heating circuit pump logic function
enabled, the curve modifies the starting and stopping
characteristics of the heating circuit pump.
Changing the standard set room temperature
Refer to the Vitocrossal 300 CA3
Operating Instructions.
Standard set room temperature
Adjustment of the standard set room temperature
from 68°F to 79°F (20°C to 26°C).
Service
