Daikin RXM35R5V1B [34/68] Connecting the refrigerant piping

7 | Piping installation

Installer reference guide

RXJ-M(9)_RXA-A(9)_RXM-R(9)_ARXM-R(9)

R32 Split system air conditioners

4P519439-12M – 2021.02

7.1.2 Refrigerant piping insulation

▪ 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

) Insulation inner diameter

(Ø

)

Insulation thickness (t)

6.4mm (1/4") 8~10mm ≥10mm

9.5mm (3/8") 12~15mm

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:

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.

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