4 Installation
Installation manual
5
RXA20~35A2V1B
R32 split series
3P517827-1 – 2017.12
3.2
Preparing refrigerant piping
3.2.1
Refrigerant piping requirements
▪
Piping material:
Phosphoric acid deoxidised seamless copper.
▪
Piping diameter:
Liquid piping
Ø6.4 mm (1/4")
Gas piping
Ø9.5 mm (3/8")
▪
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
9.5 mm (3/8")
Annealed (O)
(a)
Depending on the applicable legislation and the unit's
maximum working pressure (see "PS High" on the unit
name plate), larger piping thickness might be required.
3.2.2
Refrigerant piping length and height
difference
What?
Distance
Maximum allowable pipe length
20 m
Minimum allowable pipe length
1.5 m
Maximum allowable height difference
15 m
3.2.3
Refrigerant piping insulation
Pipe outer diameter
(Ø
p
)
Insulation inner
diameter (Ø
i
)
Insulation thickness
(t)
6.4 mm (1/4")
8~10 mm
≥10 mm
9.5 mm (3/8")
12~15 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.
4
Installation
4.1
Mounting the outdoor unit
4.1.1
To provide the installation structure
Prepare 4 sets of M8 or M10 anchor bolts, nuts and washers (field
supply).
20 mm
311
574
211
(mm)
211
>300
In any case, provide at least 300 mm of free space below the unit.
Additionally, make sure the unit is positioned at least 100 mm above
the maximum expected level of snow. In this case, it is
recommended to construct a pedestal.
311
574
211
211
(mm)
>300
100
a
a
Maximum snowfall height
If the unit is installed on brackets to the wall, install the unit as
follows:
