Daikin EHVZ08S18CB3V [12/92] Setting up the domestic hot water tank
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Daikin EHVZ08S18CB3V [12/92] Setting up the domestic hot water tank

Daikin EHVZ08S18CB3V [12/92] Setting up the domestic hot water tank
5 Application guidelines
Installer reference guide
12
ERLQ004~008CA + EHVZ04+08S18CB
Daikin Altherma – Low temperature split
4P401676-1D – 2018.07
Setting Value
Number of water temperature
zones:
▪ #: [A.2.1.8]
▪ Code: [7-02]
1 (2 LWT zones): Main +
additional
In case of heatpump convectors:
External room thermostat for the
additional zone:
▪ #: [A.2.2.5]
▪ Code: [C-06]
1 (Thermo ON/OFF): When the
used external room thermostat or
heatpump convector can only
send a thermo ON/OFF
condition.
Shut-off valve output Set to follow the thermo demand
of the main zone.
Benefits
▪ Comfort. The smart room thermostat functionality can decrease
or increase the desired leaving water temperature based on the
actual room temperature (modulation).
▪ Efficiency.
▪ Depending on the demand, the indoor 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 – Integrated DHW tank
M
M
a b c d ge h ii
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
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.

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