Viessmann VITODENS 200 - Anatomy of the Cascade Control Heating Curve

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Anatomy of the Cascade Control heating curve
Setting the s tarting point and ending point establishes the sloped line to calculate supply temperature based on
outdoor temperature. The WWSD point is determined by the Outside Temperature Fixed Point. This point
moves left/right on the grid to allow the user to select a specific outdoor temperature.
The s upply temperature that the Cascade Control calculates when emerging out of WWSD is determined by the
Flow Temperature Fixed Point. This point has an up/down movement. Both points can be moved to set the
starting point.
The Outside Temperature Climazone and Flow Temperature Climazone points determine the slope. These points
determine the supply temperature based on a given outdoor temperature. Rather than determining maximum
temperatures, these points serve as a reference for slope calculations. The starting and ending points also serve
as anchors for the Cascade Control curvature settings.
5285 565 v1.35285 565 v1.3
20
68
15
59
10
50
25
77
30
86
35
95
40
104
5
41
0
32
-5
23
-10
14
-15
5
-20
-4
176 80
158 70
140 60
122 50
104 40
86 30
68 20
50 10
-25
-13
-30
-22
Outdoor Temperature Scale
Supply Temperature Scale
Heating Curve Slope
Flow Temperature
Climazone
Outside Temperature
Climazone
Outside
Temperature
Fixed Point
Flow Temperature
Fixed Point
Flow Temperature Maximum
Flow Temperature Minimum
°F °C
°C
°F