3064816_201804
65
33. Heating circuit pump function
description
Residual head of the high efficiency pump (EEI ≤ 0.23)
Residual
head
in
[mbar]
High efficiency pump function
description (EEI ≤ 0.23)
Heating mode
3 operating modes are possible with the modulating
heating circuit pump:
1. Pump speed linear to burner output (Linear)
The heating circuit pump modulates in proportion to the
burner output, i.e. for maximum burner load the pump
will run at the maximum set pump speed for "heating
mode"; for minimum burner output at the minimum set
pump speed for "heating mode". In other words, the
burner output and pump rate are regulated subject to the
required heat load. Modulating the pump reduces the
power consumption.
2. Spread control (dT)
This type of control aims to utilise the condensing effect
as fully as possible while minimising the electrical energy
required by the pump. This is achieved by constantly
maintaining a prescribed spread.
3. Fixed speed setting (Constant)
The heating circuit pump runs at the fixed set speed, both
for minimum and maximum burner output. The pump rate
is not controlled in relation to the required heat load and
the power consumption is not reduced.
DHW mode
The heating circuit pump does not modulate, it
continuously operates at the selected "DHW" pump
speed. (See table)
Standby mode
The pump does not run when the boiler is in standby
mode.
Operating setting
The pump control can be set with parameter HG37.
0
50
100
150
200
250
300
350
400
450
500
550
600
650
0
100
200
300
400
500
600
700
800
900
1000
Fördermenge in [l/h]
R
es
tförde
rh
öhe
in
[m
ba
r]
20 %
2,8 W
70%
21,1W
50%
10 W
80 %
29,5 W
60 %
14,5 W
90 %
40,6 W
100 %
46,6 W
40 %
6,5 W
30 %
4,5 W
Pump rate in [l/h]
