Piping Installation; Preparing Water Piping; To Check The Water Volume And Flow Rate; Connecting Water Piping - Daikin ETVH-D9WG Installation Manual

Option 2: Through the right side panel
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3×
T25
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Piping installation

4.1

Preparing water piping

NOTICE
In case of plastic pipes, make sure they are fully oxygen
diffusion tight according to DIN 4726. The diffusion of
oxygen into the piping can lead to excessive corrosion.
4.1.1

To check the water volume and flow rate

Minimum water volume
Check that the total water volume in the installation is minimum 20
litres, the internal water volume of the outdoor unit NOT included.
NOTICE
When circulation in each space heating/cooling loop is
controlled by remotely controlled valves, it is important that
the minimum water volume is guaranteed, even if all of the
valves are closed.
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, and respect the minimum water
volume.
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).
ETVH/X16S18+23DA6V+9W(G)
Daikin Altherma 3 H HT F
4P586454-1B – 2020.01
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 installer reference guide for more information.
Minimum required flow rate
25 l/min
See the recommended procedure as described in
commissioning" [ 4 26].
during
4.2

Connecting water piping

4.2.1

To connect the water piping

NOTICE
Do NOT use excessive force when connecting the field
piping and make sure the piping is aligned properly.
Deformation of the piping can cause malfunctioning of the
unit.
1 Connect the O-rings and shut-off valves to the outdoor unit
water connection pipes of the indoor unit.
2 Connect the outdoor unit field piping to the shut-off valves.
3 Connect the O-rings and shut-off valves to the space heating/
cooling water pipes of the indoor unit.
4 Connect the space heating/cooling field piping of both zones to
the shut-off valves.
5 Connect the domestic hot water in and out pipes to the indoor
unit.
c d
f
e
a Space heating/cooling water OUT (screw connection, 1")
b Space heating/cooling water IN (screw connection, 1")
c Domestic hot water OUT (screw connection, 3/4")
d Domestic cold water IN (cold water supply)(screw
connection, 3/4")
e Outdoor unit water OUT (screw connection, 1")
f Outdoor unit water IN (screw connection, 1")
NOTICE
It is recommended to install shut-off valves to domestic
cold water in and domestic hot water out connections.
These shut-off valves are field supplied.
4 Piping installation
"7.2 Checklist
a b
Installation manual
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