Vaillant VWZ AI, Operating Instructions Manual, Page: 8 / 40

4 Operation
6
Operating instructions Heat pump control interface module 0020291573_00
As soon as a fault message is present, the basic displays
switches to the fault message.
4.2 Operating concept
The product has two operating levels.
The operating level for the end user shows the most import-
ant information and offers setting options which do not re-
quire any special prior knowledge.
The operating level for the competent person is reserved for
the competent person and is protected by a code.
Overview of the end user operating level (
→
Page 9)
4.3 Menu display
Xxxx
Xxxxxxxxxxx
Xxxx Xxxxxxx
Xxxxxxxxxx
xxxxxx Xxxxxxx
1
4
3
2
1 Scroll bar
2 Current assignment of
the selection buttons
3 Selection level list
entries
4 Selection level
Note
Path details at the start of a section specify how to
access this function, e.g.
Menu
¬
Information
¬
Contact data .
4.4 Starting up the product
4.4.1 Opening the isolator devices
1. Ask the competent person who installed the product to
explain to you where these isolator devices are located
and how to handle them.
2. If installed, open the service valves in the heating in-
stallation's flow and return.
3. Open the cold-water isolation valve.
4.4.2 Switching on the product
Note
The product does not have an on/off switch. The
product is switched on and ready for operation
as soon as it is connected to the power grid. It
can only be switched off using the partition that is
installed on-site, e.g. fuses or circuit breaker in the
utility connection box.
1. Ensure that the product casing has been installed.
2. Switch on the product via the fuses in the utility connec-
tion box.
◁
The "basic display" is shown in the product's operat-
ing display.
◁
The "basic display" may also be shown in the
display for the optional system control.
4.4.3 Adjusting the target cylinder temperature
Danger!
Risk of death from legionella.
Legionella multiply at temperatures below
60 °C.
▶
Have a competent person inform you
about the measures that should be taken
to protect against Legionella in your in-
stallation.
▶
Do not set any water temperatures below
60 °C without consulting the competent
person first.
Depending on the source of the energy obtained from the
environment, target cylinder temperatures of up to 70 °C can
be reached with the compressor. In order to achieve energy-
efficient domestic hot water generation predominantly from
the energy extracted from the environment, the factory set-
ting for the desired domestic hot water temperature must be
adjusted on the optional system control and/or on the heat
pump's control panel.
Condition : System control connected
▶
To do this, adjust the target cylinder temperature ( De-
sired DHW circuit temperature ) to between 50 and
55 °C.
▶
Also switch on the electric back-up heater for the do-
mestic hot water generation so that, also at outdoor tem-
peratures below 0 °C and above 20 °C, the required
60 °C can be achieved for the anti-legionella function
time programme.
Condition : No system control connected
▶
To do this, adjust the target cylinder temperature ( de-
sired domestic hot water circuit temperature ) to
65 °C.
▶
Also switch on the electric back-up heater for the do-
mestic hot water generation so that, at outdoor temper-
atures below 0 °C and above 20 °C, the required 60 °C
can also be achieved for the anti-legionella function.
4.4.4 Yield indicator
You can use this function to display the environmental
energy yield as a cumulative value for a period of a day,
a month and the total for the heating, domestic hot water
generation and cooling modes.
You can displays the working figure for a period of a month
and the total for the heating and domestic hot water genera-
tion modes. The working figure is the ratio of thermal energy
generated to the operating current used. Monthly values may
vary considerably since, for example, in the summer only
domestic hot water generation is used. A large number of
factors influence this estimate, e.g. the type of heating in-
stallation (direct heating mode = low flow temperature or in-
direct heating mode via buffer cylinder = high flow temperat-
ure). This figure may therefore deviate by up to 20%.
The working figures only record the power consumption of
internal components, not of external components such as
external heating circuit pumps, valves, etc.