Refrigerant Piping Insulation - Daikin 3MXM40N2V1B8 Installer's Reference Manual

7 | Piping installation

7.1.2 Refrigerant piping insulation

Installer reference guide
34
4MXM80
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
"7.2.6 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")
15.9 mm (5/8")
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.
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
16~20 mm
(a)
Thickness (t)
Insulation thickness (t)
≥10 mm
≥13 mm
≥13 mm
≥13 mm
2MXM68+3(A)MXM+3(A)MXF+4MXM+5MXM
4P600463-1C – 2020.08
Ø
t
4
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R32 Split series