Display Of The Filling Pressure In The Heat Pump Circuit; Preventing Low Water Pressure In The Heating Circuit; Checking Function And Leak-Tightness; Operation - Vaillant VWL 57/5 IS Operating, Installation And Maintenance Instructions

8 Operation

7.19 Display of the filling pressure in the heat
pump circuit
The product has a pressure sensor in the heating circuit and
a digital pressure display.
▶
Select Menu Live Monitor to display the filling pressure
in the heat pump circuit.
◁
To ensure that the heat pump circuit works correctly,
the filling pressure must be between 1 bar and 1.5
bar. If the heating installation extends over several
storeys, higher filling pressures may be required to
avoid air entering the heating installation.
7.20 Preventing low water pressure in the heating
circuit
▶
Remove the front casing and read the water pressure on
the product's manometer.
▶
Check whether the pressure is between 1 and 1.5 bar.
◁
If the pressure in the heating circuit is too low, add
more water using the pre-installation jig's filling
device.
7.21

Checking function and leak-tightness

Before you hand the product over to the end user:
▶
Check that the heating installation (heat generator and
system) and the domestic hot water pipes are leak-tight.
▶
Check whether the drain pipework for the purging con-
nections has been installed correctly.
8 Operation
8.1

Operating concept of the product

The operating concept and the display and setting options of
the end user level are described in the operating instructions.
9 Adapting the unit to the heating
installation
9.1

Configuring the heating installation

The installation assistant is launched when the product is
switched on for the first time. When the installation assistant
is complete, you can further adjust the parameters of the in-
stallation assistant, for example, in the Configuration menu.
To adjust the water flow rate generated by the heat pump
to match the specific installation, you can set the maximum
available pressure for the heat pump in the heating and do-
mestic hot water mode.
You can call up these two parameters via Menu → Installer
level → Configuration.
The adjustment range is between 200 mbar and 900 mbar.
The heat pump operates at its optimum level when the nom-
inal flow can be achieved by setting the available pressure
(Delta T = 5 K).
38
9.2

Remaining feed head of the product

The remaining feed head cannot be set directly. You can
limit the remaining pump head in order to adjust the on-site
pressure loss in the heating circuit.
The integrated pump attempts to reach the nominal volume
flow.
9.2.1 VWL 57/5 remaining feed head at nominal
volume flow
A
800
600
400
200
0
40 50 60
1 VWL 57/5,
3.5 kW/540 l/h
2 VWL 57/5, 5 kW/790 l/h
9.2.2 VWL 77/5 remaining feed head at nominal
volume flow
A
800
600
400
200
0
40 50 60
1 VWL 77/5,
7 kW/1020 l/h
9.2.3 VWL 127/5 remaining feed head at nominal
volume flow
A
800
600
400
200
0
40 50 60
1 VWL 127/5,
10 kW/1670 l/h
2 VWL 127/5,
12 kW/1850 l/h
Installation and maintenance instructions Hydraulic station 0020257319_02
1
2
70 80 90
A Remaining feed head in
hPa (mbar)
B Pump output in %
1
70 80 90
A Remaining feed head in
hPa (mbar)
B Pump output in %
1
2
70 80 90
A Remaining feed head in
hPa (mbar)
B Pump output in %
100 B
100 B
100 B