Daikin Altherma 3 GEO, Installer'S Reference Manual

Page: 40 / 252

5 | Application guidelines
Installer reference guide
40
EGSAH/X06+10UDA9W
Daikin Altherma 3 GEO
4P598592-1A – 2019.12
Determining the desired temperature for the DHW tank
Formula Example
V
1
=V
2
+V
2
×(T
2
−40)/(40−T
1
) If:
▪ V
2
=180 l
▪ T
2
=54°C
▪ T
1
=15°C
Then V
1
=280 l
V
1
DHW consumption (equivalent hot water volume at 40°C)
V
2
Required DHW tank volume if only heated once
T
2
DHW tank temperature
T
1
Cold water temperature
DHW tank volume
Integrated DHW tank volume: 180 l (=V
2
)
INFORMATION
DHW tank volume. You cannot select the volume of the DHW tank because only one
size is available.
Energy saving tips
▪ If the DHW consumption differs from day to day, you can program a weekly
schedule with different desired DHW tank temperatures for each day.
▪ The lower the desired DHW tank temperature, the more cost effective.
▪ The heat pump itself can produce domestic hot water of maximum 55°C. The
electrical resistance (backup heater) integrated in the heat pump can increase
this temperature. However, this consumes more energy. We recommend to set
the desired DHW tank temperature below 55°C to avoid using the electrical
resistance.
▪ When the heat pump produces domestic hot water, it cannot heat up a space. In
case you need domestic hot water and space heating at the same, we
recommend to produce the domestic hot water during the night when there is
lower space heating demand.
5.4.3 Setup and configuration – DHW tank
▪ For large DHW consumptions, you can heat up the DHW tank several times
during the day.
▪ To heat up the DHW tank to the desired DHW tank temperature, you can use the
following energy sources:
- Thermodynamic cycle of the heat pump
- Electrical backup heater
▪ For more information about optimizing the energy consumption for producing
domestic hot water, see
"10 Configuration" [
4
128].