Refrigerant Piping Insulation; Refrigerant Piping Length And Height Difference; Connecting The Refrigerant Piping - Daikin RXM20A5V1B Installer's Reference Manual

7 | Piping installation

7.1.2 Refrigerant piping insulation

7.1.3 Refrigerant piping length and height difference

7.2 Connecting the refrigerant piping

Installer reference guide
34
Outer diameter (Ø)
6.4 mm (1/4")
9.5 mm (3/8")
(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.
▪ 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")
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.
What?
Maximum allowable pipe length
Minimum allowable pipe length
Maximum allowable height difference
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.
Temper grade
Annealed (O)
Annealed (O)
) Insulation inner diameter
p
(Ø )
i
8~10 mm
10~14 mm
Class 20~35
(a)
Thickness (t)
≥0.8 mm
Insulation thickness (t)
≥10 mm
≥13 mm
Distance
Class 42
20 m 30 m
1.5 m 1.5 m
15 m 20 m
4P718129-3A – 2023.07
Ø
t
RXM-A, ARXM-A
R32 split series