Daikin SV1A25AJV1B - Preparing Refrigerant Piping; Refrigerant Piping Requirements; Refrigerant Piping Material; Refrigerant Piping Insulation

15 | Piping installation
Installer and user reference guide
83
SV1A25AJV1B+SV4~8A14AJV1B
VRV 5 safety valve unit
4P749917-1 – 2023.09
15.2 Preparing refrigerant piping
15.2.1 Refrigerant piping requirements
NOTICE
The piping and other pressure-containing parts shall be suitable for refrigerant. Use
phosphoric acid deoxidised seamless copper for refrigerant piping.
INFORMATION
Also read the precautions and requirements in the "2 General safety
precautions"[47].
▪ Foreign materials inside pipes (including oils for fabrication) must be
≤30mg/10m.
15.2.2 Refrigerant piping material
▪ Piping material: phosphoric acid deoxidised seamless copper
▪ Piping temper grade and thickness:
Outer diameter (Ø) Temper grade Thickness (t)
(a)
6.4mm (1/4")
9.5mm (3/8")
12.7mm (1/2")
Annealed (O) ≥0.80mm
t
Ø
15.9mm (5/8") Annealed (O) ≥0.99mm
19.1mm (3/4")
22.2mm (7/8")
Half hard (1/2H) ≥0.80mm
28.6mm (11/8") Half hard (1/2H) ≥0.99mm
(a)
Depending on the applicable legislation and the maximum working pressure of the unit (as
indicated on the unit nameplate), larger piping thickness might be required.
15.2.3 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:
Ambient temperature Humidity Minimum thickness
≤30°C 75% to 80% RH 15mm
>30°C ≥80% RH 20mm