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8.6 pipe selection and how to calculate
■ Main tubing size after distribution (LB,LC…)
■ Indoor unit tubing connection (l1, l2…ln-1)
■ Required Copper Tubing Dimensions (unit: mm/inch)
LB,LC...
Totalcapacityafterdistribution
Below KW
6(2.2hp)
20.2(7.2hp)
Over KW
0
6(2.2hp)
Tubing size
Gas tubing(mm/inch) Φ12. 7(1/2") Φ15. 88(5/8")
Liquid tubing(mm/inch)
Φ9.52(3/8")
l
n-1
Indoor unit type
22,28,36,45,56
63,71,90,110
Gas tubing(mm/inch)
Φ12.7(1/2")
Φ15.88(5/8")
Liquid tubing(mm/inch)
Φ6.35(1/4").
Φ9.52(3/8").
Copper
tubing
Outer diameter(mm/
inch)Tube thickness 6.35(1/4")
9.25(3/8")
12.7(1/2")
15.88(5/8") 19.05(3/4")
Tube thickness
0.8
0.8
0.8
1.0
1.0
Table
10
Table
11
Table
12
8 refrIGerANT pIpING
■ Installation sample: one project install a VRF system, following is the sketch map:
(
1
)
Choose result of the indoor unit model:
Room number
Indoor unit model
Nominal capacity of
indoor unit (KW)
A
SXV45
4.5
B
CKV22
2.2
C
CKV36
3.6
D
PNV56
5.6
E
PNV22
2.2
(2) Calculate the actual capacity match ratio
：
Actual capacity match ratio=4.5+2.2+3.6+5.6+2.2X100%=129.3%
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It meets the capacity match ratio requirement range [50%,130%].
