0020308118_05 Installation and maintenance instructions 51
Decoupling of the heat generator
from the heating system (low loss
header, plate heat exchanger, buffer
cylinder)
▶ Select parameter D.170 and, if required, D.171 to D.175
in order to adjust the hydraulic operating mode of the
heat generator to the heating installation. (→ Section 8.3)
10.3.6 Setting the pressure level for supplying the
heating system
The heating system is supplied via the pump pressure, this
results in a volume flow. The pump pressure setting is signi-
ficant. Diagnostics code D.170 can be used to set the pump
control type. (→ Section 10.3.5) The standard selection is
"constant pressure". The correct pump pressure is selected
via diagnostics code D.171 and not mechanically at the cir-
culation valve.
400
300
200
100
0 600200 400 800 1000 1400 16001200
B
A
2
3
1
D.1 71
A Pressure [mbar]
B Flow rate [l/h]
1 Maximum pressure
2 Factory setting
3 Minimum pressure
▶ Set the pressure level via D.171. (→ Section 8.3)
You should only change the circulation valve setting if the
setting of the maximum pump pressure under D.171 has not
led to the ideal supply of the heating system.
▶ If D.171 is set to 400 mbar and the heat supply is still not
sufficient, readjust the pressure via the circulation valve.
▶ Remove the front casing. (→ Section 7.10.2)
▶ Hinge the electronics box downwards.
▶
Regulate the pressure at the circulation valve (1) in a
clockwise direction.
Position of the
adjusting screw
Pressure Comment
Right-hand stop
(turned all the way
down)
0.035 MPa
(0.350 bar)
If the radiators
do not heat up
sufficiently at the
factory setting.
▶ Hinge the electronics box upwards.
▶ Install the front casing. (→ Section 7.11)
10.3.7 Pump curves
Validity: VU 10CS/1-5 (N-GB) ecoTEC plus 610 OR VU 15CS/1-5 (N-
GB) ecoTEC plus 615 OR VU 20CS/1-5 (N-GB) ecoTEC plus 620 OR
VUW 20/26CS/1-5 (N-GB) ecoTEC plus 826
400
300
200
100
0 600200 400 800 1000 1400 16001200
B
A
2
3
1
A Pressure [mbar]
1 Maximum pressure
2 Factory setting
B Flow rate [l/h]
3 Minimum pressure
Validity: VU 25CS/1-5 (N-GB) ecoTEC plus 625 OR VU 30CS/1-5 (N-GB)
ecoTEC plus 630 OR VUW 25/32CS/1-5 (N-GB) ecoTEC plus 832 OR
VUW 30/36CS/1-5 (N-GB) ecoTEC plus 836
400
300
200
100
0 600200 400 800 1000 1400 16001200
B
A
2
3
1
A Pressure [mbar]
1 Maximum pressure
2 Factory setting
B Flow rate [l/h]
3 Minimum pressure
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