5 Piping installation
Installation manual
16
ELSH/X(B)12P30+50E
Daikin Altherma 3 R MT ECH
₂
O
4P708484-1 – 2023.03
▪
Piping temper grade and thickness:
Outer diameter
(Ø)
Temper grade
Thickness (t)
(a)
6.4 mm (1/4")
Annealed (O)
≥0.8 mm
t
Ø
15.9 mm (5/8")
Annealed (O)
≥1.0 mm
(a)
Depending on the applicable legislation and the maximum
working pressure of the unit (see "PS High" on the unit name
plate), larger piping thickness might be required.
5.1.2
Refrigerant piping insulation
▪ Use polyethylene foam as insulation material:
▪ with a heat transfer rate between 0.041 and 0.052 W/mK (0.035
and 0.045 kcal/mh°C)
▪ with a heat resistance of at least 120°C
▪ Insulation thickness
Pipe outer diameter
(Ø
p
)
Insulation inner
diameter (Ø
i
)
Insulation thickness
(t)
6.4 mm (1/4")
8~10 mm
10 mm
15.9 mm (5/8")
16~20 mm
13 mm
Ø
i
Ø
i
t
Ø
p
Ø
p
If the temperature is higher than 30°C and the humidity is higher
than RH 80%, the thickness of the insulation materials should be at
least 20 mm to prevent condensation on the surface of the
insulation.
5.2
Connecting refrigerant piping
See the installation manual of the outdoor unit for all guidelines,
specifications and installation instructions.
5.2.1
To connect the refrigerant piping to the
indoor unit
1
Connect the liquid stop valve from the outdoor unit to the
refrigerant liquid connection of the indoor unit.
a
b
a
Refrigerant liquid connection
b
Refrigerant gas connection
2
Connect the gas stop valve from the outdoor unit to the
refrigerant gas connection of the indoor unit.
5.3
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. Provide adequate safeguards in the DHW
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 (=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 pressure – Storage tank.
The water inside the storage
tank is not pressurized. Therefore a visual check of the water level
in the storage tank has to be carried out annually.
▪
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
EXAMPLE
(*) Maximum temperature for piping and accessories
▪
Storage tank – Water quality
. Minimum requirements regarding
the quality of water used to fill the storage tank:
▪ Water hardness (calcium and magnesium, calculated as
calcium carbonate): ≤3 mmol/l
▪ Conductivity: ≤1500 (ideal: ≤100) μS/cm
▪ Chloride: ≤250 mg/l
▪ Sulphate: ≤250 mg/l
▪ pH value: 6.5~8.5
For properties deviating from the minimum requirements, suitable
conditioning measures have to be taken.
5.3.1
To check the water volume and flow rate
To make sure that the unit operates properly:
