
2.4.3 Functions
The electronic mixing fitting is intended to fill a bathtub with the individ‐
ually desired water temperature. To this end, the mixing fitting has three
memory presets to which the individual preferred settings for water tem‐
perature, filling volume, and filling height of the tub can be saved, ready
to be used for the next bath.
The electronic mixing fitting has been optimised for the control of elec‐
trically operated Viega bathtub drains and overflows. When a manually
operated drain and overflow is used, all functions of the mixing fitting
can be used with the exception of the electronic opening and closing of
the drain.
The following basic functions at the mixing fitting can be controlled
electronically:
nStarting and stopping the water inlet
nSetting the water temperature
nSetting the strength of the water inlet
nSwitching between bathtub inlet and hand shower
nOpening and closing the bathtub drain (only with electronically con‐
trolled processes; see product portfolio)
nSaving, 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:
nDiagnosis mode for performing a functionality test
nPerforming a thermal disinfection
nResetting the factory settings
nEnabling the safeguarding function for locking "Thermal disinfection"
and "Reset to factory settings"
nUnlocking the temperature safeguard
nCleaning mode for short-term disabling of the control element, e.g.
for cleaning
nAutomatic opening and closing of the drain fitting if the respective
Viega drain fitting has been mounted (motor-operated valve cone)
The mixing fitting is equipped with a battery to operate the mixing fitting
for approx. 20 minutes in case of power outage.
The battery is recharged immediately after return of the power supply.
If the battery charge drops below a minimum and the user attempts to
operate the mixing fitting, the illuminated ring of the control element will
flash red five times. This indicates that the battery charge is too low to
use the mixing fitting.
Basic functions
Special functions
Battery emergency operation
Product information
Multiplex Trio E fitting, electronic mixing unit 12 from 38