Daikin Altherma 3 R F EHVZ04S18E 6V Series, Installer'S Reference Manual

Page: 70 / 256

8 | Piping installation
Installer reference guide
70
ERGA04~08EAV3(A) + 08S18+9W
Daikin Altherma 3 R F
4P629093-1 – 2020.08
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
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
12 l/min
NOTICE
When circulation in each or certain space heating loops is controlled by remotely
controlled valves, it is important that the minimum flow rate is guaranteed, even if all
valves are closed. In case the minimum flow rate cannot be reached, a flow error 7H
will be generated (no heating or operation).
See the recommended procedure as described in "11.4 Checklist during
commissioning" [
4
195].
8.2.4 Changing the pre-pressure of the expansion vessel
NOTICE
Only a licensed installer may adjust the pre-pressure of the expansion vessel.