5 Application guidelines
Installer reference guide
12
ERGA04~08DAV3(A) + 08S18+23DA
Daikin Altherma – Low temperature split
4P495249-1 – 2017.12
5.3
Setting up the domestic hot water
tank
5.3.1
System layout – Integrated DHW tank
M
M
a
b c d
g
e
h
i
i
i
j
j
f
k
i
HPC1
UI
FHL1
FHL2 FHL3
HPC2
HPC3
a
Outdoor unit
b
Indoor unit
c
Heat exchanger
d
Backup heater
e
Motorised 3‑wave valve (switch between space heating
and domestic hot water)
f
Motorised 3‑way valve (mixing the main zone)
g
Main pump
h
Additional pump
i
Shut-off valve
j
Collector (field supply)
k
Domestic hot water tank
FHL1...3
Floor heating loops (field supply)
UI
User interface (field supply)
HPC1...3
Heat pump convectors (field supply)
5.3.2
Selecting the volume and desired
temperature for the DHW tank
People experience water as hot when its temperature is 40°C.
Therefore, the DHW consumption is always expressed as equivalent
hot water volume at 40°C. However, you can set the DHW tank
temperature at a higher temperature (example: 53°C), which is then
mixed with cold water (example: 15°C).
Selecting the desired temperature for the DHW tank consists of:
1
Determining the DHW consumption (equivalent hot water
volume at 40°C).
2
Determining the desired temperature for the DHW tank.
Determining the DHW consumption
Answer the following questions and calculate the DHW consumption
(equivalent hot water volume at 40°C) using typical water volumes:
Question
Typical water volume
How many showers are needed
per day?
1 shower = 10 min×10 l/min =
100 l
How many baths are needed per
day?
1 bath = 150 l
How much water is needed at the
kitchen sink per day?
1 sink = 2 min×5 l/min = 10 l
Are there any other domestic hot
water needs?
—
Example:
If the DHW consumption of a family (4 persons) per day
is as follows:
▪ 3 showers
▪ 1 bath
▪ 3 sink volumes
Then the DHW consumption = (3×100 l)+(1×150 l)+(3×10 l)=480 l
Determining the volume and 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
Possible DHW tank volumes
Type
Possible volumes
Integrated DHW tank
▪ 180 l
▪ 230 l
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. By selecting a larger DHW tank, you can lower the
desired DHW tank temperature.
▪ The heat pump itself can produce domestic hot water of maximum
55°C (50°C if outdoor temperature is low). The electrical
resistance integrated in the heat pump can increase this
temperature. However, this consumes more energy. Daikin
recommends to set the desired DHW tank temperature below
55°C to avoid using the backup heater.
▪ The higher the outdoor temperature, the better the performance of
the heat pump.
▪ If energy prices are the same during the day and the night,
Daikin recommends to heat up the DHW tank during the day.
▪ If energy prices are lower during the night, Daikin recommends
to heat up the DHW tank during the night.
▪ 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, Daikin recommends to produce the domestic
hot water during the night when there is lower space heating
demand.
5.3.3
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
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