The product is a mixing fitting for the bathtub with electronic control of water temperature and filling volume. If an electronic drain / overflow fitting is installed, filling and emptying of the bathtub can be regulated using the mixing fitting.

On technical requirements met and the use in potable water installations, see Regulations from section: Application areas .

A drain/overflow, water inlet and a pipe interrupter are required for the complete mounting of the product. Further information on this can be found at Accessories .

Regular maintenance is part of running the system properly Maintenance .

The electronic mixing fitting is intended to fill a bathtub with the individually desired water temperature. For this purpose, the mixing fitting has three memory locations in which the individual preferred settings for water temperature, fill volume, and fill depth of the tub can be saved and used for the next bath.

The electronic mixing fitting has been optimised for controlling electrically operated Viega bathtub drains/overflows. When a manually operated drain and overflow fitting is used, all functions of the mixing fitting can be used, except for the electronic opening and closing of the drain.

The following basic functions at the mixing fitting can be controlled electronically:

• Starting and stopping the water inlet

• Setting the water temperature

• Setting the strength of the water inlet

• Switching between bathtub inlet and hand shower

• Opening and closing the bathtub drain (only with electronically controlled processes; see product portfolio)

• Saving, using, and deleting personal settings

Special functions are those functions not required for the daily use of the mixing fitting. Special functions are for example basic settings and maintenance and cleaning functions.

The mixing fitting has the following special functions:

• Limiting the water inlet temperature

• Limiting the water inlet time

• Locking and unlocking extended menu lists

• Diagnosis mode for performing a functionality test

• Performing a thermal disinfection

• Resetting the factory settings

• Select temperature unit °F or °C

• Displaying statistics of various consumption data

The mixing fitting is equipped with a rechargeable battery that supplies power to the mixing fitting in the event of a power failure in order to close the mixing fitting.

The rechargeable battery is immediately recharged after the power supply is restored.

The mixing fitting has two functions protecting the user from scalding:

• From a temperature of 40 °C, the temperature setting via the control element is stepped down with factor 1:10. This means that the temperature is increased at a much slower rate so that the user cannot unintentionally set a much higher temperature.

  The temperature reduction takes place at the normal rate even if the scalding protection is enabled.

• Via the extended menu list, a maximum water inlet temperature can be specified. To cancel this maximum temperature setting, you must have a key code. A maximum temperature can be set for example to protect children from scalding.

The electronic mixing fitting differentiates between two operating statuses:

• Operating status "OFF" with water supply switched off

• Operating status "ON" with water supply switched on

The display element shows various menus depending on the operating mode. In the menus, you can make settings for the mixing unit or activate various functions.

The control element can be pressed and turned.

The display element can be turned so that the user can read it for example while laying in the bathtub. Pressing the display element firmly selects a menu item, for example.

The display element has two different display modes:

Menu display

This example shows the display element in the operating mode "OFF".

Live display

The live display indicates the current status of the fitting. The example shows the display element in the operating mode "ON". In this example, the values have the following significance:

When the fitting is in this mode, turn the control element to adjust the water temperature.

For more examples of the live display, see Control .

The illuminated ring of the control element can emit light in different colours. The colour of the illuminated ring shows which setting is being changed, or can be changed by turning the control element:

• Ring lights up turquoise: Movement during menu navigation

• Ring continuously lights up either blue, orange or red: water runs cold (blue ring), warm (orange ring) or hot (red ring).

• Ring flashes either blue, orange or red ( in operating mode "ON"): the set water temperature (target temperature) has not been reached yet.

• Ring flashes red five times (in operating status "OFF"): Actual charge of battery below minimum.

• Ring flashes red (in operating status "ON"): Thermal disinfection is running.

The display element shows four different menus, depending on the status of the product. The menus differ in respect of two factors:

• Operating status

• Locking of the extended menu list

For locking or indication of the extended menu, the following two symbols are provided in the menu list in operating status "OFF":

• locking the extended menu list

• displaying the extended menu list

The greyed-​out symbols are visible in the extended menu list only.

The symbol is the last item in each menu list. When the symbol is selected, the menu list closes immediately. Otherwise, the menu list closes automatically if the control element remains inactive for five seconds.

All menu symbols in these instructions are shown as a black symbol against a white background. The acknowledgment/findings/status symbols, on the contrary, are shown as white symbols against a black background.

In these instructions, all acknowledgement, findings, and status symbols are shown as white symbol against a black background.

All instructions for operating the mixing fitting are of a uniform structure. Two factors influence the function of the product, and a combination of these factors brings a result. These two factors are the current operating status and the action carried out by the user.

Furthermore, the menu symbol is indicated which symbolises the respective function in the display element.

Example:

The following requirements exist for the mounting of the mixing unit:

• The mixing unit may only be mounted horizontally or vertically as shown in the illustration.

• The mixing unit must remain accessible for the purpose of maintenance and the top of the casing must be removable.

  Mounting can take place in e.g. a side room or in a pre-​wall inspection opening.

• A 230 V connection is available as power supply, see Regulations from section: Mounting the mixing unit .

• The mixing unit must not be so far away from the control or display elements that the connection cable (3 m) is subjected to tensile stress.

  The connection cable of the operating or display element can be extended to 6 m if required Accessories .

The following requirements exist for the mounting of the elements:

• Fixing can take place on an even surface with the dimensions 60 x 60 mm (e.g. in the pre-​wall) or on the tub rim.

• When mounting on the tub rim, it must be ensured that the elements are never submerged in water.

  Contact with splash water does not present a problem.

• If the elements are to be mounted on the tub rim, Viega recommends having the drill holes made directly by the bathtub manufacturer, if possible.

• A drill hole with a diameter of 38–40 mm is required for fixing the elements.

• There must be clearance of at least 40 mm provided behind or below the mounting area.

• The centres of the drill holes for the elements must be at least 80 mm apart.

• The elements should be easily reachable from both inside and outside the tub.

• The connection cable must be laid free of tensile stress from the installation position of the elements to the mixing unit.

  If required, the connection cable can be extended from 3 m to 6 m Accessories .

The following requirements exist for the mounting of the drain / overflow:

• The bathtub is installed.

• The drain pipeline is installed all the way to the bathtub.

• The underside of the bathtub is accessible.

To ensure that no bath water flows back into the potable water installation, a pipe interrupter must be installed in the pipeline between the mixing unit and the bathtub inlet.

The following schematic diagram shows what this should look like:

It is important that the pipe interrupter is mounted vertically, in the direction of flow and at least 150 mm above the upper edge of the bathtub.

Observe the local standards and regulations.

The pipe interrupter is not included in the scope of delivery and must be ordered separately. Observe the instructions for use of the pipe interrupter.

Requirements:

• The installation location is permanently accessible even after mounting, and the casing cover can be removed (e.g. through an inspection opening).

• The installation location is situated in such a way that the installation location of the control elements can be reached with a cable of 3 m length (6 m with extension).

• A 230 V connection is available as power supply, see Regulations from section: Mounting the mixing unit .

• The mixing unit can be mounted with the connections facing either down or to the left. Other mounting positions or mounting at an angle impair the functionality of the mixing unit.

The mounting of the control element and the display element is shown here on the bathtub rim by way of example. For mounting them to another surface, e.g. in the pre-​wall, the same preconditions and steps apply.

Requirements:

• The planned installation location of the operating element and the display element can be reached with a 3 m long cable (6 m with extension) from the installation location of the mixing unit.

• There must be two drill holes with a diameter of 38–40 mm at the installation site.

• The centres of the drill holes must be at least 80 mm apart.

• There must be clearance of at least 40 mm behind the drill holes.

An electrically driven drain and overflow fitting must be used to be able to open and close the drain using the control element. Viega recommends one of the four models mentioned in Accessories . The motor of these models has a connection through which it is connected to the control of the mixer unit.

Requirements:

• The mixer unit has been mounted.

• The motor-​powered drain and overflow fitting has been mounted.

• The mixer unit is accessible and the lid had been removed.

• The motor of the drain and overflow fitting can be accessed from the installation location of the mixing unit using a 3 m cable (5 m with extension).

You can also control the water supply and temperature via the program memory, see Filling the bathtub using the program memory .

The fitting offers the option to set a limit value for the water inlet temperature. The limit can be between 4 °C and 80 °C. The factory setting for maximum water inlet temperature is 80 °C.

You can limit the maximum water inlet time. This setting range is between 1 and 99 minutes. If this setting range is limited, it will not be possible later on to increase the water inlet time for the individual program memory spaces beyond this limit.

The mixing unit has three program memory locations through which the water supply can take place:

• Briefly press the control element 1 x = program memory location 1

• Briefly press the control element 2 x = program memory location 2

• Briefly press the control element 3 x = program memory location 3

The program memory locations save personal settings for bathtub filling (temperature, water flow volume and water stream strength). When a program memory location is called up, the bathtub fills automatically with the preset values.

The small number next to the thermometer in the display shows the corresponding program memory location (in the example below, program memory location 2).

The display can show temperatures in either Celsius (°C) or Fahrenheit (°F). The display shows one of the two symbols, depending on the current setting.

To display the extended menu list, it is necessary to enter the key code. The key code 000 is preset on delivery.

To unlock the extended menu list at a later time, you will need the key code. On delivery, the key code is 000.

It is possible to reset the fitting completely to factory settings. For the full factory settings, refer to Factory settings .

In care mode, the electronic mixing unit is disabled for 45 seconds. This allows you to clean the control and display elements, for example, without inadvertently initiating a function.

You can disable the care mode before expiry of the 45 seconds by selecting the symbol in the menu.

Thermal disinfection is a five-​minute program, and ensures that germs in the mixing unit are removed by hot water. The mixing unit is flushed through at the maximum supply temperature. The least amount of water is used.

The fitting can carry out an automatic system diagnosis. The sensors for temperature and volumetric flow are tested.

During the analysis, the illuminated ring of the control element shows which component of the product is being checked right now.

Indication during the diagnosis:

• Illuminated ring inactive: cartridge position is being checked and calibrated

• Illuminated ring red: hot water ON

• Illuminated ring green: water OFF

• Illuminated ring: cold water ON

After completion of the diagnosis, the findings are indicated in the bottom centre of the display. The following results of a diagnosis can be indicated:

The recorded data can be output via a statistics function.

For legal reasons, the statistical data cannot be deleted.

They are indicated by one symbol each which stands for the type of the currently shown statistical value, and by one value.

You can have two water consumption values displayed:

• The entire fill volume since the mixing unit was commissioned is shown in m³ in the top line.

• The last fill volume in litres is shown in the bottom line.

Normal soap or a mild cleaning agent can be used for regular maintenance and prevention of lime scale on the control elements. Use no scouring agent or abrasive objects.

Strong stains can be removed using typical household cleaner. Rinse the detergent very thoroughly with clear water after the prescribed dwell time. There should be no residue on the components.

If the rechargeable battery is not sufficiently charged (e.g. due to age), the mixing unit will close and can no longer be used. The control element then flashes red five times.

Viega recommends replacing the battery every 3–5 years, depending on use.

For a description of the replacement of the battery, see Replacing the rechargeable battery .

Depending on the local water quality, the filters in the corner valves must be cleaned or replaced regularly. At commissioning, specify a maintenance interval which is in keeping with the local water quality.

For a description of the filter replacement, see Changing the filters in the corner valves .

Some of the causes for malfunctions can be identified by system diagnosis. Since the system diagnosis tests important (also safety-​relevant) functions of the fitting, carry out a system diagnosis regularly.

Viega recommends running a system diagnosis every 18 months. When the device is used very often, reduce the interval correspondingly.

To prevent germ infestation of the water even with infrequent use of the bathtub, Viega recommends carrying out a thermal disinfection in the following cases and intervals:

• after the bathtub has not been used for 72 hours, see Regulations from section: Maintenance

• otherwise after 7 days at the latest, see Regulations from section: Maintenance

Depending on the local water quality, the filters in the corner valves need to be changed regularly.

Requirements:

• The corner valves are accessible (e.g. through a revision opening).

Requirements:

• The mixing unit is accessible (e.g. through a revision opening).

• The lid of the mixing unit can be removed.

• A spare battery is available.