8
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Piping installation
Installer reference guide
85
E EHFH03S18D
Daikin Altherma 3 R F
4P596806-1C – 2022.09
▪
Recirculation pump.
In accordance with the applicable legislation, it may be
required to connect a recirculation pump in between the hot water end point
and the recirculation connection of the domestic hot water tank.
c
d
a
b
a
Recirculation connection
b
Hot water connection
c
Shower
d
Recirculation pump
8.5.2 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)
8.5.3 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
There are no requirements for the minimum water volume.
INFORMATION
In critical processes, or in rooms with a high heat load, extra water might be
required.
M2
a
b
a
a
c
c
M3
M1
a
Individual room thermostat (optional)
b
Differential pressure bypass valve (field supply; recommended)
c
Shut-off valve
Maximum water volume
Use the following graph to determine the maximum water volume for the
calculated pre-pressure.
