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Daikin R410As Service Manual: Selection Of Pipe Size, Joints And Header

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Si39-302
6.

Selection of Pipe Size, Joints and Header

6.1
RXYQ5MY1B, RXYQ8MY1B, RXYQ10MY1B,
RXYQ12MY1B, RXYQ14MY1B,
RXYQ16MY1B
6.1.1 How to select the REFNET Joint
How to select the REFNET Joint
Select the REFNET Joint from the following table when using REFNET Joints at the first branch
counted from the outdoor unit side.
(Ex. : REFNET Joint A)
For REFNET Joints other than the first branch, select the proper ones based on the total
capacity index of the indoor units installed after the first branch using the following table :
Total capacity index of indoor
6.1.2 How to select pipe size
Between outdoor unit and uppermost stream REFNET Joint.
Pipe size connected to outdoor unit.
Piping Material
Select the piping material to be used from the next table according to piping size.
Wall thickness of refrigerant pipe
Copper tube O.D
Copper tube W.T
The table shows the requirements of Japanese High Pressure Gas Control low. The thickness
and material shall be selected in accordance with local code. (As of Jan.2003)
Appendix
Outdoor Unit
RXYQ5MY1B
RXYQ8,10MY1B
RXYQ12-16MY1B
units
<200
≥200~<290
≥290
Outdoor Unit
RXYQ5MY1B
RXYQ8MY1B
RXYQ10MY1B
RXYQ12-16MY1B
Piping Size (O / D)
φ15.9 or less
φ19.1 or more
Temper grade
O Type
φ 6.4
φ 9.5
(Minimum
0.80
0.80
requirement)
Selection of Pipe Size, Joints and Header
REFNET Joints (Kit Name)
KHRP26M22T
KHRP26M33T
KHRP26M72T
REFNET Joints (Kit Name)
KHRP26M22T
KHRP26M33T
KHRP26M72T
Gas
φ15.9
φ19.1
φ22.2
φ28.6
Temper grade of Material
O
1 / 2H or H
φ 12.7 φ 15.9 φ 19.1 φ 22.2 φ 25.4 φ 28.6 φ 31.8 φ 34.9 φ 38.1 φ4 1.3
0.80
0.99
0.80
0.80
Liquid
φ9.5
φ12.7
1/2H Type
0.88
0.99
1.10
1.21
(Unit : mm)
1.32
1.43
275

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