5 Piping installation
Installation manual
8
ETVH/9W
Daikin Altherma 3 H MT F
4P634880-1 – 2021.03
Option 2: Through the right side panel
1
3×
T25
3
2
5
Piping installation
5.1
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.
NOTICE
Water circuit requirements.
Make sure to comply with the
water pressure and water temperature requirements
below. For additional water circuit requirements, see the
installer reference guide.
▪
Water pressure – Domestic hot water.
The maximum water
pressure is 4 bar. Provide adequate safeguards in the water circuit
to ensure that the maximum pressure is NOT exceeded. The
minimum water pressure to operate is 1 bar.
▪
Water pressure –
Space heating/cooling circuit.
The maximum
water pressure is 3 bar. Provide adequate safeguards in the water
circuit to ensure that the maximum pressure is NOT exceeded.
The minimum water pressure to operate is 1 bar.
▪
Water temperature.
All installed piping and piping accessories
(valve,
connections,…)
MUST
withstand
the
following
temperatures:
INFORMATION
The following illustration is an example and might NOT
match your system layout.
89°C
(*)
75°C
(*)
75°C
(*)
M
EXAMPLE
(*) Maximum temperature for piping and accessories
5.1.1
To check the water volume and flow rate
Minimum water volume
Check that the total water volume in the installation is higher than
the minimum water volume, the internal water volume of the indoor
unit NOT included:
If…
Then the minimum water
volume is…
Cooling operation
20 l
Heating operation
0 l
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.
Minimum required flow rate
20 l/min
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).
See the installer reference guide for more information.
See the recommended procedure as described in
30].
