Instruction Manual
13
For conventional PWM pump operation (parameter P15=0)
The PWM pump (activated by parameter P12) works with a modulated speed in the C.H. system activated by the signal
from the room temperature regulator (RT). The rotational speed is adjusted in such a way in cooperation with the modulator
to achieve the value of delta T defined by parameter P13 (the difference between outgoing and return temperature of the
central heating system). Achieving and maintaining the set temperature of the central heating system is the priority. The
minimum allowable rotational pump speed is determined by parameter P14. The maximum allowable rotation of the pump
is determined by parameter P18.
ECO mode (parameter P15 = 1)
The PWM Pump (selection using parameter P12) works with a modulated speed in the C.H. system and is activated by the
signal from RT. The pump’s rotational speed is adjusted in such a way in cooperation with the modulator to achieve the
expected delta T value, the difference between outgoing and return temperature of the central heating system (calculated
on the basis of the preset ratio ECO.
The ECO factor can be changed using the boiler controller between the range 0.1 to 0.9. The default value (optimal in most
cases) is 0.5. Selecting lower values results in lower gas consumption leading to reduced heat energy being transferred into
the room. The user benefits by being able to regulate the boiler to achieve the desired thermal comfort at minimum cost (less
gas consumption, lower power consumption).
An ECO factor value of 0.5 is the maximum for which the control seeks to meet the conditions promoting condensation
(C.H. return temperature <=55 C) regardless of the water temperature setting in C.H.. It is recommended to operate the
C.H. system with an ECO ratio within the range of 0.1 to 0.5. If increasing the set C.H. heating water temperature does not
produce adequate thermal comfort, the value of the ECO factor should be increased gradually. An ECO factor equal to 0.9
practically corresponds to the traditional work of a pump without speed control.
Irrespective of the mode of operation:
It is a priority to achieve and maintain the set C.H. temperature of water. The minimum allowable rotational speed of the
pump is determined by parameter P14. The maximum is determined by parameter P18.
2.4.4.1 Expected T value depending on the C.H. water setting and the ECO coefficient
The expected value of T depending on the C.H. water setting and the ECO coefficient.
Standard heating (P8 = 0): Setting of C.H. water
Floor heating (P8 = 1): Setting of C.H. water
Eco
40°C
45°C
50°C
55°C
60°C
65°C
70°C
75°C
80°C
Eco
35°C
40°C
45°C
50°C
55°C
0,1
24
30
35
35
35
35
35
38
42
0,1
16
24
30
35
35
0,2
21
26
30
30
30
30
30
33
37
0,2
14
21
26
30
30
0,3
18
22
26
26
26
26
26
28
31
0,3
12
18
22
26
26
0,4
15
19
22
22
22
22
22
24
26
0,4
10
15
19
22
22
0,5
12
15
17
17
17
17
17
19
21
0,5
8
12
15
17
17
0,6
9
11
13
13
13
13
13
14
15
0,6
6
9
11
13
13
0,7
6
7
8
8
8
8
8
9
10
0,7
4
6
7
8
8
0,8
3
3
4
4
4
4
4
4
5
0,8
2
3
3
4
4
0,9
0
0
0
0
0
0
0
0
0
0,9
0
0
0
0
0
NOTE!
If the temperature sensor of the return water from central heating is damaged or is not connected, the pump works
at a constant speed.
