Daikin VRV II Series, Design, Installation & Testing Instructions, Page: 176 / 242

Refrigerant Piping Si39-303
170 Installation Manual
5. Protection against contamination when installing pipes
•
Take measures to prevent foreign materials like moisture and contamination from mixing
into the system.
•
Great caution is needed when passing copper tubes through walls.
Precautions when selecting branch piping.
!
If the piping between the outdoor units is 90m or longer, be sure to enlarge the main pipe in
the liquid-side and gas-side branch piping. (This does not apply to Q5 type)
Depending on the length of the refrigerant piping, the power may drop, but even in such
cases it is ok to enlarge the main pipe.
1.Outdoor unit
2.Main pipe
3.Enlarge
4.The first refrigerant branching kit.
5.Indoor unit
[Gas side]
RXYQ5MY1B type:
........... φ
15.9
→ φ
19.1 (Minimum thickness
φ
1.00mm)
RXYQ8MY1B type:
........... φ
19.1
→ φ
22.2 (Minimum thickness
φ
1.00mm)
RXYQ10MY1B type:
......... φ
22.2
→ φ
25.4 (Minimum thickness
φ
1.00mm)
RXYQ12-14MY1B type:
... φ
28.6
→
Not Increased
RXYQ16-22MY1B type:
... φ
28.6
→ φ
31.8 (Minimum thickness
φ
1.10mm)
RXYQ24MY1B type:
......... φ
34.9
→
Not Increased
RXYQ26-34MY1B type:
... φ
34.9
→ φ
38.1 (Minimum thickness
φ
1.10mm)
RXYQ36-48MY1B type:
... φ
41.3
→
Not Increased
[Liquid side]
RXYQ5MY1B type:
........... φ
9.5
→
Not Increased
RXYQ8-10MY1B type:
..... φ
9.5
→ φ
12.7 (Minimum thickness
φ
0.80mm)
RXYQ12-16MY1B type:
... φ
12.7
→ φ
15.9 (Minimum thickness
φ
1.00mm)
RXYQ18-24MY1B type:
... φ
15.9
→ φ
19.1 (Minimum thickness
φ
1.00mm)
RXYQ26-48MY1B type:
... φ
19.1
→ φ
22.2 (Minimum thickness
φ
1.00mm)
Place Installation period Protection method
Outdoor
More than a month Pinch the pipe
Less than a month
Pinch or tape the pipe
Indoor Regardless of the period
1
2
4
5
3