Daikin ETVZ16S18EA6V, Installer'S Reference Manual

Page: 72 / 272

8 | Piping installation
Installer reference guide
72
EPRA14~W1 + ET9W
Daikin Altherma 3 H HT F
4P644739-1 – 2021.02
20
2,4
2,1
1,8
1,5
1,2
0,9
1
0,6
0,3
70 120
175 140 200 255
220 270
A
B
A Pre-pressure (bar)
B Maximum water volume (l)
Water
Water + glycol
Example: Maximum water volume and expansion vessel pre-pressure
Installation
height
difference
(a)
Water volume
≤190 l >190 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
on each zone separately. This minimum flow rate is required during defrost/backup
heater operation. For this purpose, use the overpressure bypass valve delivered
with the unit.
Minimum required flow rate
25 l/min