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Piping installation
Installer reference guide
78
EPRA14~W1 + ETVH/9W(G)
Daikin Altherma 3 H HT F
4P587502-1 – 2019.07
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/backup heater operation. For
this purpose, use the overpressure bypass valve delivered with the unit.
NOTICE
To guarantee proper operation it is recommended to have a minimum flow of 28 l/
min during DHW.
NOTICE
If glycol was added to the water circuit, and the temperature of the water circuit is
low, the flow rate will NOT be displayed on the user interface. In this case, the
minimum flow rate can be checked by way of the pump test (check that the user
interface does NOT display error 7H).
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).
