Daikin ETSX16E Installer's Reference Manual page 247

11.4.6 To set up bivalent heat sources
EPRA14~18D + ETSH/X(B)16P30+50E
Daikin Altherma 3 H HT ECH₂O
4P679467-1D – 2023.11
3 Modify and restart the execution of the program
(a)
If the UFH screed dryout program was stopped due to a power failure and the power
resumes, the program will automatically restart the last implemented step.
For systems without indirect auxiliary boiler connected to the storage tank, it is
mandatory to install an electric backup heater to ensure safe operation for all
conditions.
Drain back models
For drain back models, a backup heater (EKECBUA*) must always be installed.
For drain back models, the factory setting of field code [C-02] is set to 0.
Bivalent models
For bivalent models, the factory setting of the field code [C-02] is set to 2. It is
assumed that a controllable bivalent external heat source is connected (see the
installer reference guide for more information).
Without a controllable bivalent external heat source, a backup heater (EKECBUA*)
must be installed and the field code [C-02] set to 0.
HINT: If field code [C-02] is set to 0 and no backup heater is connected, error UA
17 is output at AL 3 * ECH2O.
11 Commissioning
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(a)
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Installer reference guide
247