Daikin ERLA03DAV3, Installer'S Reference Manual, Page: 26 / 192

5 | Application guidelines
Installer reference guide
26
ERLA EHFZ03S18DJ3V
Daikin Altherma 3 R F
4P596821-1A – 2020.05
5.3 Setting up the domestic hot water tank
5.3.1 System layout – Integrated DHW tank
A
a
b
A Domestic hot water
a Cold water IN
b Hot water OUT
5.3.2 Selecting the 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 for 2 persons per day is as follows:
▪ 1 showers
▪ 1 bath
▪ 2 sink volumes
Then the DHW consumption = (1×100 l)+(1×150 l)+(2×10 l)=270 l