5.2 Flow (boiler) temperature
The ECL Comfort controller determines and controls the flow
(boiler) 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 (boiler) 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 (boiler) 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
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
1
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
(boiler) 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 (boiler) temperatures at
different outdoor temperatures and at a desired room temperature
of 20 °C.
If the desired room temperature is changed, the desired flow
(boiler) 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 (boiler) temperature
Slope changes
Coordinate changes
The calculated flow (boiler) temperature can be influenced by the
‘Boost’ and ‘Ramp’ functions etc.
Example:
Heat curve:
1.0
Desired flow (boiler) temp.:
50 °C
Desired room temp.:
22 °C
Calculation (22–20) × 1.0 × 2.5 =
5
Result:
The desired flow (boiler) temperature will be corrected from 50 °C
to 55 °C.
104 | © Danfoss | 2017.09
VI.GU.L2.02
Operating Guide ECL Comfort 210/296/310, application A275/A375
