Viessmann VITODENS 200 - Adjustment of Outside Temperature Fixed Point

35
Adjustment of outside temperature fixed point
Sample graph (with 1.0 curvature)
Adjustment A B C D
Outside Temperature Fixed Point ºF / ºC 86 / 30 68 / 20 50 / 10 32 / 0
Flow Temperature Fixed Point ºF / ºC 68 / 20 68 / 20 68 / 20 68 / 20
Outside Temperature Climazone ºF / ºC -4 / -20 -4 / -20 -4 / -20 -4 / -20
Flow Temperature Climazone ºF / ºC 167 / 75 167 / 75 167 / 75 167 / 75
Normal Room Temperature ºF / ºC 68 / 20 68 / 20 68 / 30 68 / 20
Note: Adjusting the Outside Temperature Fixed Point controls the WWSD point. Note the slope.
The adjustment of the Outside Temperature Fixed Point setting changes the slope of the curve with respect to
a given supply temperature, specifically the Flow Temperature Fixed Point.
Warm weather shutdown is determined by the Outside Temperature Fixed Point, as well as the Heating Limit
Time Response and Heating Limit Differential setting.
By increasing or decreasing this setting, the slope of the curve is recalculated and will therefore recalculate the
supply temperature setpoint with respect to changes in outdoor temperature.
The adjustment of this setting takes place on the horizontal axis as shown in the example above.
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
A B C D
Supply Temperature
°C°F
°F
°C