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13 Piping installation
Installation and operation manual
16
FXFN-B
CO₂ VRV system air conditioner
3P672850-2C – 2024.11
13 Piping installation
13.1 Preparing refrigerant piping
13.1.1 Refrigerant piping requirements
NOTICE
Refrigerant R744 requires strict cautions for keeping the
system clean and dry. Foreign materials (including mineral
oils or moisture) should be prevented from getting mixed
into the system.
NOTICE
The piping and other pressure-containing parts shall be
suitable for refrigerant and oil. Use K65 (or equivalent)
copper-iron alloy tube system for high-pressure
applications with a working pressure of 120 bar gauge at
the air conditioner side and 90 bar gauge at the
refrigeration side.
▪ Foreign materials inside pipes (including oils for fabrication) must
be ≤30mg/10m.
NOTICE
If the ability to close the stop valves for field piping is
wanted, the installer MUST install a pressure relief valve
on the liquid AND gas piping between the outdoor unit and
the air conditioning indoor units.
Refrigerant piping diameter
Liquid piping Gas piping
Ø9.5mm Ø12.7mm
Refrigerant piping material
Piping material
K65 copper-iron alloy (CuFe2P), maximum operating pressure =
120bar
Piping temper grade and thickness
Outer diameter
(Ø)
Temper grade Thickness (t)
(a)
9.5mm (3/8") R420
(drawn)
≥0.65mm
t
Ø
12.7mm (1/2") ≥0.85mm
(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.
13.1.2 Refrigerant piping insulation
▪ Use polyethylene foam as insulation material:
▪ with a heat transfer rate between 0.041 and 0.052W/mK (0.035
and 0.045kcal/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)
9.5mm (3/8") 10~14mm ≥10mm
12.7mm (1/2") 14~16mm ≥10mm
Ø
i
Ø
i
t
Ø
p
Ø
p
If the temperature is higher than 30°C and the humidity is higher
than RH80%, the thickness of the insulation materials should be at
least 20 mm to prevent condensation on the surface of the
insulation.
13.2 Connecting the refrigerant piping
DANGER: RISK OF BURNING/SCALDING
13.2.1 To connect the refrigerant piping to the
indoor unit
CAUTION
Install the refrigerant piping or components in a position
where they are unlikely to be exposed to any substance
which may corrode components containing refrigerant,
unless the components are constructed of materials that
are inherently resistant to corrosion or are suitably
protected against corrosion.
▪ Pipe length. Keep refrigerant piping as short as possible.
WARNING
▪ Use K65 piping for high-pressure applications with a
working gauge pressure of 120 bar or 90 bar,
depending on its location in the system.
▪ Use K65 unions and fittings approved for a working
gauge pressure of 120bar or 90bar, depending on its
location in the system.
▪ ONLY brazing is allowed for connection of pipes. No
other types of connections are allowed.
▪ Expanding of pipes is NOT allowed.
1 Insert the field pipe into the piping on the indoor unit side.
2 Connect refrigerant piping to the unit using only brazed
connections.
NOTICE
When brazing, cover the plastic hold plate (d) and thermal
insulation (e) by a wet cloth and make sure the
temperature does not exceed 200°C.
ec dba
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Productinformatie
| Merk | Daikin |
| Model | FXFN80B2VEB |
| Categorie | Airco |
| Taal | Nederlands |
| Grootte | 3913 MB |
