Daikin Altherma 3 HT Installer's Reference Manual page 86

8 | Piping installation
Installer reference guide
86
b Overpressure bypass valve (delivered as accessory)
c Shut-off valve
Maximum water volume
NOTICE
The maximum water volume depends on whether glycol is added to the water
circuit. For more information on the addition of glycol, refer to
water circuit against
Use the following graph to determine the maximum water volume for the
calculated pre-pressure.
A
2,4
2,1
1,8
1,5
1,2
1
0,9
0,6
0,3
20 70
A Pre-pressure (bar)
B Maximum water volume (l)
Water
Water + glycol
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.
4
freezing" [ 92].
120 220
140 200
175
Water volume
≤190 l
height
NOT exceed the
allowed water
"8.2.6 To protect the
270
255
B
>190 l
Do the following:
▪ 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.
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.
EPRA14~18D + ETVH/X16S18+23E
Daikin Altherma 3 H HT F
4P644737-1A – 2022.03
height
the
water