Daikin R410As Service Manual page 289

Selection of Pipe Size, Joints and Header
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)
6.2.3 How to select the REFNET header
Select the proper REFNET Header using the following table based on the total capacity index of
indoor units installed after the header.
Total capacity index of indoor units
When using REFNET Joints at the first branch counted from the outdoor unit side, use
KHRP26M73H for larger than RXYQ24MY1B .
6.2.4 Piping between the REFNET Joints.
Select the proper pipe size using the following table based on the total capacity index of indoor
units connected downstream.
Connection piping size should be larger than main piping size.
Connection piping size should not exceed the refrigerant piping size selected by "the model with
combination units".
6.2.5 Piping between the multi connection piping kit
Select the proper pipe size using the following table based on the total capacity index of outdoor
units connected upper stream.
278
Temper grade
φ 6.4 φ 9.5
(Minimum
0.80 0.80
requirement)
<200
≥200~<290
≥290~<640
≥640
Total capacity index of indoor units
<200
≥200~<290
≥290~<420
≥420~<640
≥640~<920
≥920
Total capacity index of outdoor units
connected to upper stream
Less than RXYQ22MY1B
RXYQ24MY1B
RXYQ26MY1B or more~
Less than RXYQ32MY1B
O Type
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
REFNET Header (Kit Name)
KHRP26M22H (Max.4 Branches)
KHRP26M33H (Max8 Branches)
KHRP26M72H (Max8 Branches)
KHRP26M73H (Max8 Branches)
KHRP26M73HP
Gas
φ15.9
φ22.2
φ28.6
φ34.9
φ41.3
Gas
φ28.6
φ34.9
1/2H Type
0.88 0.99 1.10 1.21
Liquid
φ9.5
φ12.7
φ15.9
φ19.1
Liquid Oil
φ15.9
φ6.4
φ19.1
Si39-302
(Unit : mm)
1.32 1.43
Appendix