Daikin Altherma EHFH03S18D 3V Series Installer's Reference Manual page 86

8 | Piping installation
Installer reference guide
86
a
2.4
2
1.5
1
0.5
0.3
20 50 100
a Pre-pressure (bar)
b Maximum water volume (l)
Example: Maximum water volume and expansion vessel pre-pressure
Installation
height
(a)
difference
≤7 m No pre-pressure adjustment is
required.
>7 m Do the following:
▪ Increase the pre-pressure
according to the required
installation
difference. The pre-pressure
should increase by 0.1 bar
for each metre above 7 m.
▪ Check if the water volume
does
maximum
volume.
(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
150 200 250
Water volume
≤200 l
Do the following:
▪
▪
The expansion vessel of the
indoor unit is too small for the
installation. In this case, it is
recommended to install an
height
extra vessel outside the unit.
NOT exceed the
allowed water
b
290
>200 l
Decrease the pre-pressure
according to the required
installation
difference. The pre-pressure
should decrease by 0.1 bar
for each metre below 7 m.
Check if the water volume
does NOT exceed
maximum allowed
volume.
ERLA03D + EHFH03S18D
Daikin Altherma 3 R F
4P596806-1C – 2022.09
height
the
water