Daikin EHYHBX08AFV3 [48/252] Formula to calculate the expansion vessel pre pressure
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Daikin EHYHBX08AFV3 [48/252] Formula to calculate the expansion vessel pre pressure

Daikin EHYHBX08AFV3 [48/252] Formula to calculate the expansion vessel pre pressure
6 | Preparation
Installer reference guide
48
EVLQ05+08CAV3 + EHYHBH05AF + EHYHBH/X08AF + EHYKOMB33AA
Daikin Altherma hybrid heat pump
4P355634-1F – 2020.10
c
d
a b
a Recirculation connection
b Hot water connection
c Shower
d Recirculation pump
6.4.2 Formula to calculate the expansion vessel pre-pressure
The pre-pressure (Pg) of the vessel depends on the installation height difference
(H):
Pg=0.3+(H/10) (bar)
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
hg
c f
g i
a Outdoor unit
b Indoor unit
c Heat exchanger
d Boiler
e Bypass valve

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