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(mm)
a
100 mm above expected level of snow
4.2.2
To install the outdoor unit
4.2.3
To provide drainage
NOTICE
If the unit is installed in a cold climate, take adequate
measures so that the evacuated condensate CANNOT
freeze.
NOTICE
If the drain holes of the outdoor unit are blocked up by a
mounting base or floor surface, place additional foot bases
≤30 mm under the outdoor unit's feet.
INFORMATION
For information on the available options, contact your
dealer.
1 Use a drain plug for drainage.
2 Use a Ø16 mm hose (field supply).
RXJ20~35A
R32 split series
3P482320-17X – 2021.12
4× M8/M10
a
Drain port
b
Bottom frame
c
Drain plug
d
Hose (field supply)
5
Piping installation
5.1
Preparing refrigerant piping
5.1.1
Refrigerant piping requirements
CAUTION
Piping and joints of a split system shall be made with
permanent joints when inside an occupied space except
joints directly connecting the piping to the indoor units.
NOTICE
The piping and other pressure-containing parts shall be
suitable for refrigerant. Use phosphoric acid deoxidised
seamless copper for refrigerant.
▪ Foreign materials inside pipes (including oils for fabrication) must
be ≤30 mg/10 m.
Refrigerant piping diameter
Pipe outer diameter (mm)
Liquid piping
Ø6.4
Refrigerant piping material
▪ Piping material: Phosphoric acid deoxidised seamless copper.
▪ Flare connections: Only use annealed material.
▪ Piping temper grade and thickness:
Outer diameter
Temper grade
(Ø)
6.4 mm (1/4")
Annealed (O)
9.5 mm (3/8")
Annealed (O)
(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
Insulation inner
(Ø
)
diameter (Ø
p
6.4 mm (1/4")
8~10 mm
9.5 mm (3/8")
10~14 mm
5 Piping installation
b
a
c
d
Gas piping
Ø9.5
(a)
Thickness (t)
Ø
≥0.8 mm
t
Insulation thickness
)
(t)
i
≥10 mm
≥13 mm
Installation manual
7
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