Adjustment Of Flow Temperature Fixed Point - Viessmann Vitodens 200 Operating Instructions And User's Information Manual

Adjustment of flow temperature fixed point

Sample graph (with 1.0 curvature)
°F °C
176 80
158 70
140 60
122 50
104 40
86 30
68 20
50 10
40 35
104 95
Adjustment
Outside Temperature Fixed Point
Flow Temperature Fixed Point
Outside Temperature Climazone
Flow Temperature Climazone
Normal Room Temperature
Note: Adjusting the Flow Temperature Fixed Point increases or decreases the supply setpoint when the control
comes out of WWSD. Note the slope.
The adjustment of the Flow Temperature Fixed Point setting changes the slope of the curve with respect to
higher outdoor temperatures. This is also the value that is calculated by the control when it emerges out of
warm weather shutdown. The higher the value, the greater the supply temperature.
By increasing or decreasing the 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 vertical axis as shown in the example above.
36
A
B
C
D
30 25 20 15
86 77 68 59
Outdoor Temperature
ºF / ºC
ºF / ºC
ºF / ºC
ºF / ºC
ºF / ºC
10 5 0 -5
50 41 32 23
A B
68 / 20 68 / 20
140 / 60 86 / 30
-4 / -20 -4 / -20
158 / 70 158 / 70
68 / 20 68 / 20
-10 -15 -20 -25
14 5 -4 -13
C D
68 / 20 68 / 20
68 / 20 50 / 10
-4 / -20 -4 / -20
158 / 70 158 / 70
68 / 20 68 / 20
-30 °C
°F
-22