Setting Up Bivalent Heat Sources; Setting Up A Direct Auxiliary Heat Source For Space Heating - Daikin Altherma 3 H MT ECH2O 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.
If no electric backup heater is installed, the system automatically assumes availability
of an indirect auxiliary boiler. In this case, storage tank set temperatures will only be
reached reliably for all operating conditions if auxiliary boiler energy is actually
available.
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
▪ When there is a heating request, the indoor unit or the auxiliary boiler starts
operating. Which of these units operates, depends on the outdoor temperature
(status of the changeover to external heat source). When the permission is given
to the auxiliary boiler, the space heating by the indoor unit is turned OFF.
▪ Bivalent operation is only possible if:
- Space heating is turned ON, and
- Tank operation is turned OFF
▪ Domestic hot water is always produced by the storage tank connected to the
indoor unit.
EPRA08~12EAV3+W1 + ETSH/X(B)12P30+50EF
Daikin Altherma 3 H MT ECH₂O
4P663478-1 – 2021.07