Piping Installation; Preparing Refrigerant Piping; Refrigerant Piping Requirements; Refrigerant Piping Insulation - Daikin 2MXM-N9 Installation Manual

d Hose (field supply)
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.
▪ Piping diameter:
Class 40
Liquid piping
Gas piping
Class 50
Liquid piping
Gas piping
▪ Piping temper grade and thickness:
Outer diameter Temper grade
(Ø)
6.4 mm (1/4") Annealed (O)
9.5 mm (3/8")
12.7 mm (1/2")
(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.
Usage of reducers might be required based on the indoor unit. See
"5.2.1 Connections between outdoor and indoor unit using
reducers" [ 4 15] for more information.
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") 12~15 mm
12.7 mm (1/2") 14~16 mm
Ø Ø
i i
Ø Ø
p p
t
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.
2(A)MXM40+50 + 2(A)MXF40+50
R32 Split series
3P600450-3G – 2021.03
2× Ø6.4 mm (1/4")
2× Ø9.5 mm (3/8")
2× Ø6.4 mm (1/4")
1× Ø9.5 mm (3/8")
1× Ø12.7 mm (1/2")
(a)
Thickness (t)
Ø
≥0.8 mm
t
Insulation thickness
) (t)
i
≥10 mm
≥13 mm
≥13 mm
5.1.3 Refrigerant piping length and height
difference
The shorter the refrigerant piping, the better the performance of the
system.
The piping length and height differences must comply with the
following requirements.
Model
Class 40
Class 50
Shortest allowable length per room is 3 m.
Refrigerant piping length to each indoor unit
Refrigerant piping total length
Height difference
outdoor-indoor
Outdoor unit installed ≤15 m
higher than indoor
unit
Outdoor unit installed ≤7.5 m
lower than at least 1
indoor unit
5.2

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.
CAUTION
Do NOT connect the embedded branch piping and the
outdoor unit when only carrying out piping work without
connecting the indoor unit in order to add another indoor
unit later.
5.2.1 Connections between outdoor and indoor
unit using reducers
Total indoor unit capacity class that can be connected to this
outdoor unit:
Outdoor unit
2MXM40, 2AMXM40, 2AMXF40,
2MXF40
2MXM50, 2AMXM50, 2AMXF50,
2MXF50
Port Class
2MXM40, 2AMXM40
A 15, 20, 25, 35
B 15, 20, 25, 35
2AMXF40
A 25, 35
5 Piping installation
Minimum required space
2
1.2 m
2
1.8 m
≤20 m
≤30 m
Height difference
indoor-indoor
≤7.5 m
≤15 m
Total indoor unit capacity
class
≤6.0 kW
≤8.5 kW
Reducer
—
—
—
Installation manual
15