Refrigerant Piping Insulation; Refrigerant Piping Length And Height Difference; Connecting The Refrigerant Piping; About Connecting The Refrigerant Piping - Daikin RXTM30R2V1B Installer's Reference Manual

7.1.2 Refrigerant piping insulation

7.1.3 Refrigerant piping length and height difference

7.2 Connecting the refrigerant piping

7.2.1 About connecting the refrigerant piping

RXTM-R_RXTP-R_ARXTP-R_RXTA-B
R32 split series
4P518023-11H – 2021.03
(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.
Before connecting the refrigerant piping
Make sure the outdoor and indoor unit are mounted.
Typical workflow
Connecting the refrigerant piping involves:
) Insulation inner diameter
p
(Ø )
i
8~10 mm
10~14 mm
7 Piping installation
|
Insulation thickness (t)
≥10 mm
≥13 mm
Distance
20 m
1.5 m
15 m
Installer reference guide
33