8
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Piping installation
Installer reference guide
83
ERRA08~12E + EL23E
Daikin Altherma 3 R MT F
4P708478-1 – 2023.05
▪
Piping material:
phosphoric acid deoxidised seamless copper
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Piping connections:
Only flare and brazed connections are allowed. The indoor
and outdoor units have flare connections. Connect both ends without brazing. If
brazing should be needed, take the guidelines in the installer reference guide
into account.
▪
Flare connections:
Only use annealed material.
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Piping diameter:
Liquid piping
Ø6.4 mm (1/4")
Gas piping
Ø15.9 mm (5/8")
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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.
8.1.2 Refrigerant piping insulation
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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
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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.
8.2 Connecting the refrigerant piping
NOTICE
Vibration.
To prevent vibration of the refrigerant piping during operation, fixate the
piping between the outdoor and indoor unit.
NOTICE
Vibration.
To prevent vibration noise of the rubber grommet during operation, make
sure the rubber grummet is not deformed by refrigerant piping. Insert refrigerant
piping into the outdoor unit as straight as possible. If necessary, ensure that piping
bends are not placed close to the rubber grommet.
