To Set Up Bivalent Heat Sources - Daikin EPRA10EAV3 Installer's Reference Manual

11 | Commissioning

11.4.6 To set up bivalent heat sources

Installer reference guide
244
2 You can read out the value here: Stopped at + the step
where the underfloor screed dryout was stopped.
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.
—
(a)
. —
EPRA08~12EAV3+W1 + ETSH/X(B)12P30+50EF
Daikin Altherma 3 H MT ECH₂O
4P663478-1B – 2022.07