Refrigerant Piping Insulation - Daikin R32 Series Installer's Reference Manual

5 | Preparation

5.3.2 Refrigerant piping insulation

Installer reference guide
26
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 (Ø)
6.4 mm (1/4")
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.
Usage of reducers might be required based on the indoor unit. See
"6.4.6 Connections between outdoor and indoor unit using reducers"
more information.
▪ 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 (Ø
6.4 mm (1/4")
9.5 mm (3/8")
12.7 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")
Temper grade
Annealed (O) ≥0.8 mm
≥1 mm
) Insulation inner diameter
p
(Ø )
i
8~10 mm
10~14 mm
14~16 mm
(a)
Thickness (t)
Insulation thickness (t)
≥10 mm
≥13 mm
≥13 mm
3(A)MXM+3(A)MXF+4MXM+5MXM
4P600463-1B – 2020.05
Ø
t
4
[ 35] for
R32 Split series