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Piping installation
Installer reference guide
86
E EHFH03S18D
Daikin Altherma 3 R F
4P596806-1C – 2022.09
0.3
0.5
1
1.5
2
2.4
50
20
100
150
200
250
290
a
b
a
Pre-pressure (bar)
b
Maximum water volume (l)
Example: Maximum water volume and expansion vessel pre-pressure
Installation
height
difference
(a)
Water volume
≤200 l
>200 l
≤7 m
No pre-pressure adjustment is
required.
Do the following:
▪
Decrease the pre-pressure
according to the required
installation
height
difference. The pre-pressure
should decrease by 0.1 bar
for each metre below 7 m.
▪
Check if the water volume
does
NOT
exceed
the
maximum allowed water
volume.
>7 m
Do the following:
▪
Increase the pre-pressure
according to the required
installation
height
difference. The pre-pressure
should increase by 0.1 bar
for each metre above 7 m.
▪
Check if the water volume
does
NOT
exceed
the
maximum allowed water
volume.
The expansion vessel of the
indoor unit is too small for the
installation. In this case, it is
recommended to install an
extra vessel outside the unit.
(a)
This is the height difference (m) between the highest point of the water circuit and the
indoor unit. If the indoor unit is at the highest point of the installation, the installation
height is 0 m.
Minimum flow rate
Check that the minimum flow rate in the installation is guaranteed in all conditions.
This minimum flow rate is required during defrost operation. For this purpose, it is
recommended to use a differential pressure bypass valve (field supply).
Minimum required flow rate
12 l/min
