Daikin EGSQH10S18AA9W, Installer'S Reference Manual

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5 Application guidelines
Installer reference guide
15
EGSQH10S18AA9W
Daikin Altherma ground source heat pump
4P351748-1D – 2016.02
Possible DHW tank volumes
Type Possible volumes
Integrated DHW tank ▪ 180 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.
▪ The heat pump itself can produce domestic hot water of maximum
55°C. The electrical resistance integrated in the heat pump can
higher 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.
▪ 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 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
2
=V
1
×(40−T
1
)/(T
2
−T
1
) If:
▪ V
1
=480 l
▪ T
2
=54°C
▪ T
1
=15°C
Then V
2
=307 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
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 "8 Configuration" on page 34 .
5.4.4 DHW pump for instant hot water
Setup
b
c
a
d
e
f
a DHW tank
b DHW pump (field supply)
c Shower (field supply)
d Cold water
e Domestic hot water OUT
f 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.
▪ For more information about connecting the recirculation
connection: see "7 Installation" on page 23 .
Configuration
▪ For more information, see "8 Configuration" on page 34 .
▪ You can program a schedule to control the DHW pump via the
user interface. For more information, see the user reference
guide.
5.4.5 DHW pump for disinfection
Setup
b
a
c e
d
f
g
h
a DHW tank
b DHW pump (field supply)
c Heater element (field supply)
d Non‑return valve (field supply)
e Shower (field supply)
f Cold water
g Domestic hot water OUT
h Recirculation connection
▪ The DHW pump is field-supplied and its installation is the
responsibility of the installer.
▪ The temperature of the DHW tank can be set to maximum 60°C. If
applicable legislation requires higher temperature for disinfection,
you can connect a DHW pump and heater element as shown
above.
▪ If applicable legislation requires disinfection of the water piping
until the tapping point, you can connect a DHW pump and heater
element (if needed) as shown above.
Configuration
The indoor unit can control DHW pump operation. For more
information, see
"8 Configuration" on page 34 .