Setting Up The Domestic Hot Water Tank; System Layout - Standalone Dhw Tank; Selecting The Volume And Desired Temperature For The Dhw Tank - Daikin Altherma 3 H HT W EPRA14DAV3 Installer's Reference Manual

6 | 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
50
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.
–15 –10 –5
d
M
.
min
0 5
T (°C)
a
c
EPRA14~18DAV3+W1 + ETBH/X16EF6V+9W
Daikin Altherma 3 H HT W
4P644736-1 – 2021.02