Daikin RXTA-N - Refrigerant Piping Length and Height Difference; Connecting the Refrigerant Piping; About Connecting the Refrigerant Piping

7 | Piping installation
Installer reference guide
34
RXTM30+40N2V1B + RXTP25+35N2V1B9 + RXTP25+35N2V1B8 +
ARXTP25+35N2V1B + RXTA30N2V1B
R32 split series
4P518023-7H – 2020.08
Pipe outer diameter (Ø
p
) Insulation inner diameter
(Ø
i
)
Insulation thickness (t)
6.4mm (1/4") 8~10mm ≥10mm
9.5mm (3/8") 12~15mm
Ø
i
Ø
i
t
Ø
p
Ø
p
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.
7.1.3 Refrigerant piping length and height difference
What? Distance
Maximum allowable pipe length 20m
Minimum allowable pipe length 1.5m
Maximum allowable height difference 15m
7.2 Connecting the refrigerant piping
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:
ð 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.
WARNING
▪ Only use R32 as refrigerant. Other substances may cause explosions and
accidents.
▪ R32 contains fluorinated greenhouse gases. Its global warming potential (GWP)
value is 675. Do NOT vent these gases into the atmosphere.
▪ When charging refrigerant, ALWAYS use protective gloves and safety glasses.
7.2.1 About connecting the refrigerant piping
Before connecting the refrigerant piping
Make sure the outdoor and indoor unit are mounted.
Typical workflow
Connecting the refrigerant piping involves:
▪ Connecting the refrigerant piping to the indoor unit
▪ Connecting the refrigerant piping to the outdoor unit
▪ Insulating the refrigerant piping