Setting The Anti-Legionella Function; Calling Up The Installer Level; Checking The Configuration; Calling Up Statistics - Vaillant uniTOWER plus Operating Instructions Manual

▶
Activate the internal electric back-up heater with one of
the output levels.
▶
You can find the output levels for the electric back-up
heater in the tables in the appendix.
5.4 kW back-up heater at 230 V and at 400 V
(→ Appendix K)
▶
Ensure that the maximum output for the electric back-up
heater does not exceed the output of the fuse protection
for the household electricity system .
8.10

Setting the anti-legionella function

▶
Set the anti-legionella function using the system control.
To ensure sufficient anti-legionella protection, the electric
back-up heater must be activated.
Condition: Internal electric back-up heater deactivated or external back-up
heater
The anti-legionella function can be used without a back-up
heater in the outdoor temperature range of -10 °C to +30 °C;
outside of this temperature range, the function can only be
used with an activated internal or external back-up heater.
An external back-up heater must be protected against over-
heating, for example, so that it is intrinsically safe. An ex-
ternal back-up heater must be connected to contact X14 via
a cut-off relay. On the indoor unit's control, the setting must
be converted to the external back-up heater under MO relay.
Menu → Installer level → Configuration.
8.11

Calling up the installer level

1. Press and at the same time.
Navigate to Menu → Installer level and confirm by
2.
pressing (OK).
3. Set the value 17 and confirm by pressing
8.12

Checking the configuration

You can recheck and set the most important system para-
meters. Call up Configuration to configure the menu item.
Menu → Installer level → Configuration.
8.13

Calling up statistics

Menu → Installer level → Test menu → Statistics
You can use this function to call up the statistics for the heat
pump.
8.14 Displaying the filling pressure in the building
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 building circuit.
40
8.15

Activating cooling mode

▶
Go to the indoor unit's control panel.
▶
Navigate to: Menu → Installer level → Configuration →
Cooling technology.
▶
Select: Active cooling.
▶
If this involves a heat pump cascade, implement this set-
ting for every heat pump with cooling function.
Condition: System control present
▶
Go to the system control.
▶
Activate cooling mode (→ Instructions for the system con-
trol).
8.16

Checking function and leak-tightness

Before you hand the product over to the end user:
▶
Check the heating installation (heat generator and sys-
tem) and the domestic hot water pipes for tightness.
▶
Check whether the drain pipework for the purging con-
nections has been installed correctly.
8.16.1 Checking the heating mode
▶
Start check programme P.04.
8.16.2 Checking the domestic hot water generation
▶
Check whether the cylinder is purged and the domestic
hot water temperature is reached.
8.17

Floor drying

–
Condition: No system control connected
Caution.
.
Risk of damage to the product caused by
impermissible purging
Without purging the heating circuit, the sys-
tem may become damaged.
▶
–
You can use this function to "dry heat" freshly laid screed
in accordance with the construction regulations, accord-
ing to a defined time and temperature schedule, without
the need for a system control to be connected.
VIH QW 190/6
If there is no electric back-up heater, screed drying is
only possible with this product if the return temperature is
above 10 °C. This corresponds approximately to an outdoor
temperature of +5 °C. At outdoor temperatures below
+5 °C, there is a risk of increased icing of the fin-type heat
exchanger in the outdoor unit.
When screed drying is activated, all the selected operating
modes are interrupted. The function controls the flow tem-
perature of the controlled heating circuit according to a pre-
set programme, regardless of the outdoor temperature.
The display shows the target flow temperature. You can
manually set the current day.
Installation and maintenance instructions 0020291525_04
If the screed drying is activated without a
system control, purge the system manu-
ally. No automatic purging takes place.