The ECL Comfort controller determines and controls the flow
temperature related to the outdoor temperature. This relationship
is called the heat curve.
The heat curve is set by means of 6 coordinate points. The desired
flow temperature is set at 6 pre-defined outdoor temperature
values.
The shown value for the heat curve is an average value (slope),
based on the actual settings.
Outdoor
temp.
Desired flow temp.
Your
settings
A
B
C
-30 °C
45 °C
75 °C
95 °C
-15 °C
40 °C
60 °C
90 °C
-5 °C
35 °C
50 °C
80 °C
0 °C
32 °C
45 °C
70 °C
5 °C
30 °C
40 °C
60 °C
15 °C
25 °C
28 °C
35 °C
Adjust the desired flow temperature at -30, -15, -5, 0, 5, and 15 °C,
if required.
A:
Example for floor heating
B: Factory settings
C:
Example for radiator heating (high demand)
MENU > Settings > Flow (boiler) temperature
Heat curve
Circuit
Setting range
Factory setting
2
0.1 ... 4.0
1.0
The heat curve can be changed in two ways:
1. The value of the slope is changed (see heat curve examples
on next page)
2. The coordinates of the heat curve are changed
Change the value of the slope:
Push the dial to enter / change the slope value of the heat curve
(example: 1.0).
When the slope of the heat curve is changed by means of the slope
value, the common point for all heat curves will be a desired flow
temperature = 24.6 °C at an outdoor temperature = 20 °C
Change the coordinates:
Push the dial to enter / change the coordinates of the heat curve
(example: -30,75).
The heat curve represents the desired flow temperatures at
different outdoor temperatures and at a desired room temperature
of 20 °C.
If the desired room temperature is changed, the desired flow
temperature also changes:
(Desired room T - 20) × HC × 2.5
where "HC" is the Heat Curve slope and "2.5" is a constant.
Desired flow temperature
Slope changes
Coordinate changes
The calculated flow temperature can be influenced by the ‘Boost’ and
‘Ramp’ functions etc.
Example:
Heat curve:
1.0
Desired flow temp.:
50 °C
Desired room temp.:
22 °C
Calculation (22–20) × 1.0 × 2.5 =
5
Result:
The desired flow temperature will be corrected from 50 °C to 55 °C.
Choosing a heat curve slope
The heat curves represent the desired flow temperature at different outdoor temperatures and at a desired room temperature of 20 °C.
VI.GU.L2.02
© Danfoss | 2017.09 | 105
Operating Guide ECL Comfort 210/296/310, application A275/A375
