Setting Up The Domestic Hot Water Tank; System Layout - Standalone Dhw Tank; Selecting The Volume And Desired Temperature For The Dhw Tank - Daikin EBLQ011CA3V3 Installer's Reference Manual

5 Application guidelines
▪ Efficiency.
▪ Depending on the demand, the outdoor unit supplies different
leaving water temperature matching the design temperature of
the different heat emitters.
▪ Under floor heating has the best performance with Altherma LT.
5.3 Setting up the domestic hot water
tank
5.3.1 System layout – Standalone DHW tank
a b e c
d
d
f
g
a Outdoor unit
b Heat exchanger
c Pump
d Shut‑off valve
e Backup heater (option)
f Control box
g User interface
h Motorised 3‑way valve
i Domestic hot water tank
j Heat exchanger coil
k Collector (field supply)
FHL1...3 Under floor heating
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 volume and desired temperature for the DHW tank

consists of:
1 Determining the DHW consumption (equivalent hot water
volume at 40°C).
2 Determining the volume and 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
How many showers are needed
per day?
How many baths are needed per
day?
How much water is needed at the
kitchen sink per day?
Are there any other domestic hot
water needs?
Installer reference guide
18
h k
M
FHL1
FHL2
j
FHL3
i
Typical water volume
1 shower = 10 min×10 l/min =
100 l
1 bath = 150 l
1 sink = 2 min×5 l/min = 10 l
—
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
V =V +V ×(T −40)/(40−T )
1 2 2 2 1
V =V ×(40−T )/(T −T )
2 1 1 2 1
V DHW consumption (equivalent hot water volume at 40°C)
1
V Required DHW tank volume if only heated once
2
T DHW tank temperature
2
T Cold water temperature
1
Possible DHW tank volumes
Type
Standalone DHW tank
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 electrical resistance.
▪ 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.
EBLQ+EDLQ011~016CA3V3+W1 + EK(2)CB07CAV3
Daikin Altherma low temperature monobloc
Example
If:
▪ V =180 l
2
▪ T =54°C
2
▪ T =15°C
1
Then V =280 l
1
If:
▪ V =480 l
1
▪ T =54°C
2
▪ T =15°C
1
Then V =307 l
2
Possible volumes
▪ 150 l
▪ 180 l
▪ 200 l
▪ 250 l
▪ 300 l
▪ 500 l
4P538847-1 – 2018.05