Piping Installation; Preparing Refrigerant Piping; Refrigerant Piping Requirements; Refrigerant Piping Insulation - Daikin R32 Split Series Installation Manual

5 Piping installation

2 Install the drain socket.
a b c b b
a
a
a Drain hole. Install a drain cap (large).
b Drain hole. Install a drain cap (small).
c Drain hole for drain socket
5 Piping installation
5.1

Preparing refrigerant piping

5.1.1

Refrigerant piping requirements

▪ Piping material: Phosphoric acid deoxidised seamless copper.
▪ Piping diameter:
2MXM68
Liquid piping
Gas piping
3MXM40, 3MXM52, 3MXM68, 3AMXM52, 3MXF52, 3AMXF52,
3MXF68
Liquid piping
Gas piping
4MXM68
Liquid piping
Gas piping
4MXM80
Liquid piping
Gas piping
5MXM90
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")
15.9 mm (5/8")
(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.
Installation manual
12
2× Ø6.4 mm (1/4")
1× Ø9.5 mm (3/8")
1× Ø12.7 mm (1/2")
3× Ø6.4 mm (1/4")
1× Ø9.5 mm (3/8")
2× Ø12.7 mm (1/2")
4× Ø6.4 mm (1/4")
2× Ø9.5 mm (3/8")
2× Ø12.7 mm (1/2")
4× Ø6.4 mm (1/4")
1× Ø9.5 mm (3/8")
1× Ø12.7 mm (1/2")
2× Ø15.9 mm (5/8")
5× Ø6.4 mm (1/4")
2× Ø9.5 mm (3/8")
1× Ø12.7 mm (1/2")
2× Ø15.9 mm (5/8")
(a)
Thickness (t)
Ø
≥0.8 mm
t
≥1 mm
Usage of reducers might be required based on the indoor unit. See
"5.2.1 Connections between outdoor and indoor unit using
reducers" [ 4 13] 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") 10~14 mm
12.7 mm (1/2") 14~16 mm
15.9 mm (5/8") 16~20 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.
Use separate thermal insulation pipes for the gas and liquid
refrigerant piping.
5.1.3 Refrigerant piping length and height
difference
INFORMATION
For the Hybrid for Multi application and the DHW generator
for Multi, see the indoor unit installation manual for the
maximum allowable 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
2MXM68, 3MXM40, 3MXM52,
3AMXM52, 3MXF52, 3AMXF52
3MXM68, 3MXF68
4MXM68
4MXM80
5MXM90
Shortest allowable length per room is 3 m.
2MXM68+3(A)MXM+3(A)MXF+4MXM+5MXM
Insulation thickness
) (t)
i
≥10 mm
≥13 mm
≥13 mm
≥13 mm
Minimum required space
2
4.7 m
2
5.5 m
2
6.5 m
2
9.8 m
2
10.4 m
R32 Split series
3P600450-1D – 2020.08