VI.KT.G6.02 © Danfoss | 2016.05 | 11
Maintenance
Slope 2175
Setting range
Factory setting
0.1 ... 4.0
1.2
Adjust the ‘Slope’ of the heat curve, if required.
The heat curve slope depends on the heating system and area specific design
parameters.
Example I
Design parameter:
Designed outdoor temperature (T
out
)
-12 °C
Designed flow temperature (T
flow
)
80 °C
Designed room temperature (T
room
)
20 °C
For designed flow temperature higher than 40 °C, the heat curve slope
(S)
can be
calculated as:
S =
T
flow
- 25
2.5 x T
room
- T
out
- 30
S =
80 - 25
2.5 x 20 - (- 12) - 30
S ≈ 1.7
Example II
Design parameter:
Designed outdoor temperature (T
out
)
-20 °C
Designed flow temperature (T
flow
)
35 °C
Designed room temperature (T
room
)
21 °C
For designed flow temperatures lower than 40 °C, the heat curve slope
(S)
can be
calculated as:
S =
T
flow
- 20
1.3 (2.5 x T
room
- T
out
- 30)
S =
35 - 20
1.3 (2.5 x 21 - (- 20) - 30)
S ≈ 0.3
For quick setting, the graph can be used. The graph is intended for a T
room
of 20 °C. If the
design data from example I is used, the slope will be approx. 1.7.
