Setting Up Bivalent Heat Sources; Setting Up A Direct Auxiliary Heat Source For Space Heating - Daikin Altherma 3 H HT ETSX16E7 Installer's Reference Manual

6 | Application guidelines

6.3 Setting up bivalent heat sources

6.3.1 Setting up a direct auxiliary heat source for space heating

Installer reference guide
48
Benefits
▪ Comfort.
- The smart room thermostat functionality can decrease or increase the desired
leaving water temperature based on the actual room temperature
(modulation).
- The combination of the two heat emitter systems provides the excellent
heating comfort of the underfloor heating, and the excellent cooling comfort of
the heat pump convectors.
▪ Efficiency.
- Depending on the demand, the indoor unit supplies different leaving water
temperature matching the design temperature of the different heat emitters.
- Underfloor heating has the best performance with the heat pump system.
The unit with integrated energy storage tank offers various possibilities to
incorporate auxiliary and bivalent heat sources for domestic hot water and space
heating. This allows to optimize the system for minimum energy consumption and
maximum user comfort for each individual installation.
INFORMATION
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
("6.3.2 Setting up an indirect auxiliary heat source for domestic hot water and space
heating" [ 4 51]).
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.
INFORMATION
Direct (SH) is only possible in case of 1 leaving water temperature zone with:
▪
room thermostat control, OR
▪
external room thermostat control.
▪ Space heating can be done by:
- The indoor unit
- An auxiliary boiler (field supply) connected to the system
EPRA14~18D + ETSH/X(B)16P30+50E
Daikin Altherma 3 H HT ECH₂O
4P679467-1B – 2022.09