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6
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Application guidelines
6.4 Setting up the domestic hot water tank
6.4.1 System layout – Standalone DHW tank
6.4.2 Selecting the volume and desired temperature for the DHW tank
Installer reference guide
48
Setpoint of the auxiliary gas boiler
To prevent freeze-up of the water piping, the auxiliary gas boiler must have a fixed
setpoint ≥55°C, or a weather-dependent setpoint ≥T
T
(°C)
min
60
50
40
30
20
10
0
–30
–25
–20
T
Outdoor temperature
a
T
Minimum weather-dependent setpoint for auxiliary gas boiler
min
a
b
a DHW tank
b Cold water IN
c Hot water OUT
d Motorised 3‑way valve
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:
–15
–10
–5
c
d
M
.
min
0
5
T
(°C)
a
EBLA09~16D + EDLA09~16D
Daikin Altherma 3 M
4P620241-1B – 2022.05
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