5 Piping installation
Installation manual
8
ETV23E
Daikin Altherma 3 H HT F
4P644729-1E – 2023.10
Option 1: Through the left side panel
1
3×
T25
3
2
Option 2: Through the right side panel
1
3×
T25
3
2
5
Piping installation
INFORMATION
This unit is a heating only model. Therefore, all references
to cooling in this document are NOT applicable.
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 10 bar (=1.0 MPa), and must be in accordance with
the applicable legislation. Provide adequate safeguards in the
water circuit to ensure that the maximum pressure is NOT
exceeded (see
"5.2.2 To connect the water piping for domestic hot
10]). The minimum water pressure to operate is 1 bar
(=0.1 MPa).
▪
Water pressure –
Space heating/cooling circuit.
The maximum
water pressure is 3 bar (=0.3 MPa). 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
(=0.1 MPa).
▪
Water temperature.
All installed piping and piping accessories
(valve,
connections,…)
MUST
withstand
the
following
temperatures:
INFORMATION
The following figure is an example and may NOT
completely 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 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 differential
pressure bypass valve delivered with the unit, and respect the
minimum water volume.
Minimum required flow rate
▪ For E models: 25 l/min
▪ For E7 models: 22 l/min
NOTICE
To guarantee proper operation it is recommended to have
a minimum flow of 28 l/min during DHW.
