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5 Piping installation
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).
a
a
Drain port
b
Bottom frame
c
Drain plug
d
Hose (field supply)
To close the drain holes and attach the drain
socket
NOTICE
In cold areas, do NOT use a drain socket, hose and caps
(1, 2) with the outdoor unit. Take adequate measures so
that the evacuated condensate CANNOT freeze.
1 Install drain caps 1 and 2 (accessory). Make sure the edges of
the drain caps close off the holes completely.
a
b
a
Bottom frame
b
Drain cap
2 Install the drain socket.
a
b
c
b
b
a
a
a
Drain hole. Install a drain cap (2).
b
Drain hole. Install a drain cap (1).
c
Drain hole for drain socket
5
Piping installation
5.1
Preparing refrigerant piping
5.1.1
Refrigerant piping requirements
NOTICE
The piping and other pressure-containing parts shall be
suitable for refrigerant. Use phosphoric acid deoxidised
seamless copper for refrigerant.
▪ Piping material: Phosphoric acid deoxidised seamless copper.
▪ Flare connections: Only use annealed material.
▪ Piping diameter:
Liquid piping
Ø6.4 mm (1/4")
Gas piping
Ø12.7 mm (1/2")
Installation manual
8
▪ Piping temper grade and thickness:
Outer diameter
6.4 mm (1/4")
9.5 mm (3/8")
12.7 mm (1/2")
b
15.9 mm (5/8")
c
d
5.1.2
▪ 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
6.4 mm (1/4")
9.5 mm (3/8")
12.7 mm (1/2")
15.9 mm (5/8")
Ø
Ø
p
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.
5.1.3
What?
Maximum allowable pipe length
Minimum allowable pipe length
Maximum allowable height distance
5.2
5.2.1
▪ Piping length. Keep field piping as short as possible.
▪ Piping protection. Protect the field piping against physical
damage.
Temper grade
Thickness (t)
(Ø)
Annealed (O)
≥0.8 mm
≥1 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.
Refrigerant piping insulation
Insulation inner
(Ø
)
diameter (Ø
)
p
i
8~10 mm
10~14 mm
14~16 mm
16~20 mm
Ø
Ø
i
i
t
Refrigerant piping length and height
difference
Connecting the refrigerant piping
DANGER: RISK OF BURNING/SCALDING
CAUTION
▪ No brazing or welding on site for units with R32
refrigerant charge during shipment.
▪ During installation of the refrigeration system, joining of
parts with at least one part charged shall be performed
taking into account the following requirements: inside
occupied spaces non-permanent joints are NOT
allowed for R32 refrigerant except for site made joints
directly connecting the indoor unit to piping. Site made
joints directly connecting piping to indoor units shall be
of non-permanent type.
To connect the refrigerant piping to the
outdoor unit
(a)
Ø
t
Insulation thickness
(t)
≥10 mm
≥13 mm
≥10 mm
≥13 mm
Distance
30 m
3 m
20 m
RXF50~71D5V1B
R32 split series
3P645642-2E – 2021.10
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