Viessmann VITODENS 200 - Adjustment of Normal Room Temperature

39
Adjustment of normal room temperature
Sample graph (with 1.0 curvature)
Adjustment A B C D
Outside Temperature Fixed Point ºF / ºC 68 / 20 68 / 20 68 / 20 68 / 20
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 158 / 70 158 / 70 158 / 70 158 / 70
Normal Room Temperature ºF / ºC 68 / 20 86 / 30 104 / 40 50 / 10
Note: Line A is shifted in a diagonal direction when the normal room temperature setting is altered. Slope of the
line remains the same.
The normal room temperature setting is used in conjunction with the calculated heating curve slope. Generally,
the normal room temperature setting and the outdoor temperature fixed point are set to the same value. In this
case a heating slope shift is not present.
If the normal room temperature is set higher or lower than the outside temperature fixed point, the difference
between the two settings is the amount of shift. For example, if both points are set to a value of 68ºF / 20ºC,
the difference is 0 and there is no shift. However, if the normal room temperature is set to 86ºF / 30ºC and the
outside temperature fixed point is set to 68ºF / 20ºC, the amount of shift is 18ºF / 10ºC. The sloped line is
shifted 18ºF / 10ºC on the diagonal grid line.
The reverse is also true. If the normal room temperature is set to 50ºF / 10ºC and the outdoor temperature
fixed point is set to 68ºF / 20ºC, there will be a 18ºF / 10ºC difference and a shift adjustment of 18ºF / 10ºC
degrees.
By shifting the slope, the user maintains the desired warm weather shutdown point while adjusting the heating
curve to suit the building demands.
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
ABC
D
Supply Temperature
°C
°F
°C°F