Vaillant ecoTEC plus VU 446/5-5 (H-GB) Installation And Maintenance Instructions Manual page 41

10.2.5 Setting the heating pump
10.2.5.1 Pump mode setting
The product is equipped with a stage-controlled high-effi-
ciency pump. In the automatic operating mode (D.014 =
0), the pump stage is controlled in such a way that a con-
stantly available pressure is guaranteed. The target values
for the available pressure in mbar can be called up via the
diagnostics codes:
–
D.122 for the heating circuit
–
D.148 for the domestic hot water circuit
If required, you can manually set the pump mode to five
fixed, selectable stages based on the maximum possible out-
put. This switches the speed regulation off.
▶
To change the pump output, change D.014 to the desired
value.
Note
If a low loss header is installed in the heating
installation, we recommend switching off the
speed regulation and setting the pump output
to a fixed value.
10.2.5.2 Help when adjusting a heating installation
or when checking the flow rate
You can use diagnostics code D.029 to display the flow rate
in real time (in l/min).
By setting the automatic pump mode (D.014 = 0) and
defining a target value for the available pressure (e.g.
D.122 = 200 mbar), it is possible to adjust the balancing
valves for the various radiators.
▶
To guarantee that the pump operates, set a permanent
heat demand (using the control or the room thermostat).
▶
Insulate each radiator and/or each radiator group, one
after the other.
▶
Adjust the balancing valve for the circuit by displaying the
flow rate via diagnostics code D.029 in order to achieve
the flow rate that is recommended for the properties of
the radiator and/or radiator group.
0020261389_03 ecoTEC plus Installation and maintenance instructions
10.2.5.3 Product pump curve and operating range
Validity: VU 446/5-5 (H-GB)
B
1 2
1000
800
600
400
200
0 500 1000
1 Flow range without
operating the product
2 Operating range with
limited flow temperature
and power
3 Pump curve at 100%
PWM
Validity: VU 606/5-5 (H-GB)
B
1 2
1200
1000
800
600
400
200
0 500 1000 1500
1 Flow range without
operating the product
2 Operating range with
limited flow temperature
and power
3 Pump curve at 100%
PWM
In order to guarantee that the product works without any
problems, the flow rate is permanently monitored to determ-
ine the operating range.
10.2.6 Setting the maximum flow temperature
You can use diagnostics code D.071 to set the required
maximum flow temperature for the heating mode (factory
setting: 75 °C).
3 4
1500 2000 2500
ΔP constant
4
A Installation volume flow
in l/h
B Remaining pump head
in hPa (mbar)
3 4
2000 2500 3000
ΔP constant
4
A Installation volume flow
in l/h
B Remaining pump head
in hPa (mbar)
3000
A
3500
A
41