6
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Preparation
Installer reference guide
44
C08AF + EHYKOMB33A
Daikin Altherma R Hybrid
4P471761-1E – 2020.10
6.4.3 To check the water volume and flow rate
The indoor unit has an expansion vessel of 10 litre with a factory set pre-pressure
of 1 bar.
To make sure that the unit operates properly:
▪
You must check the minimum and maximum water volume.
▪
You might need to adjust the pre-pressure of the expansion vessel.
Minimum water volume
Check that the total water volume in the installation is minimum 13.5 litre, the
internal water volume of the indoor unit NOT included.
INFORMATION
In critical processes, or in rooms with a high heat load, extra water might be
required.
NOTICE
When circulation in each space heating/cooling loop is controlled by remotely
controlled valves, it is important that the minimum water volume is guaranteed,
even if all of the valves are closed.
RAD1 RAD2 RAD3
T
95°C
a
b
d e
h
g
c
f
g
i
a
Outdoor unit
b
Indoor unit
c
Heat exchanger
d
Boiler
e
Bypass valve
f
Pump
g
Shut‑off valve (field supply)
h
Collector
i
Bypass valve (field supply)
RAD1…3
Radiator (field supply)
Maximum water volume
Use the following graph to determine the maximum water volume for the
calculated pre-pressure.
