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▪ 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. When 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.
Determining the DHW consumption
Answer the following questions and calculate the DHW consumption
(equivalent hot water volume at 40°C) using the 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?
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 = (3x100 l) + (1x150 l) + (3x10 l) = 480 l
Determining the volume and desired temperature for the DHW
tank
Formula
V
= V
+ V
x (T
−40) / (40−T
)
1
2
2
2
1
V
= V
x (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
5.4.4
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 integrated DHW tank)
▪ Electrical booster heater (for standalone DHW tank)
▪ Solar panels
ERHQ011~016BA + ERLQ011~016CA + EHVH/X16S18+26CA
Daikin Altherma - Low Temperature Split
4P313777-1C – 2012.11
Typical water volume
1 shower = 10 min x 10 l/min =
100 l
1 bath = 150 l
1 sink = 2 min x 5 l/min = 10 l
—
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
5 Application guidelines
▪ For more information about:
▪ Optimizing the energy consumption for producing domestic hot
water, see "8 Configuration" on page 33.
▪ Connecting the electrical wiring of the standalone DHW tank to
the indoor unit, see the installation manual of the DHW tank.
▪ Connecting the water piping of the standalone DHW tank to the
indoor unit, see the installation manual of the DHW tank.
5.4.5
Combination: Standalone DHW tank +
Solar panels
By connecting the DHW tank to solar panels, the DHW tank can be
heated by solar energy.
For installation instructions, see the installation manual of the solar
kit and addendum book for optional equipment.
c.4
c
c.3
a
c.2
b
a Solar panels
b Solar pump station
c Solar pump station controller with temperature
sensors
c1 Tank temperature sensor
c2 Return temperature sensor to solar panels
c3 Supply temperature with flow meter from solar
panels
c4 Solar panel temperature sensor
d Solar kit
e DHW temperature sensor of the unit
f Solenoid 2-way valve (only for UK). Obligatory for
compliance to UK building regulation G3.
Heating system
Example of unit
5.4.6
DHW pump for instant hot water
Setup
h
c
a
i
f
b
g
a Indoor unit
b DHW tank
c DHW pump
f Shower
g Cold water
h Domestic hot water OUT
i Recirculation connection
▪ By connecting a DHW pump, instant hot water can be available at
the tap.
▪ The DHW pump and the installation are field supply and the
responsibility of the installer.
M
f
e
c.1
d
Installer reference guide
15
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