14
1-6. Straight Equivalent Length of Joints
Design the tubing system by referring to the following table for the straight equivalent length of joints.
Table 1-14 Straight Equivalent Length of Joints
Table 1-15 Required Copper Tubing Dimensions
Unit: mm
1-7. Additional Refrigerant Charge
Additional refrigerant charge amount is calculated from the narrow tubing total length as follows.
Table 1-16 Amount of Refrigerant Charge Per Meter, According to Narrow Tubing Size
Wide tubing size (mm)
12.7
15.88
19.05
22.22
25.4
28.58
31.8
38.1
90
°
elbow
0.30
0.35
0.42
0.48
0.52
0.57
0.70
0.79
45
°
elbow
0.23
0.26
0.32
0.36
0.39
0.43
0.53
0.59
U-shape tube bent (R60 100 mm)
0.90
1.05
1.26
1.44
1.56
1.71
2.10
2.37
Trap bend
2.30
2.80
3.20
3.80
4.30
4.70
5.00
5.80
Y-branch distribution joint
Equivalent length conversion not needed.
Ball valve for service
Equivalent length conversion not needed.
Material
0
Copper tubing
Outer diameter
6.35
9.52
12.7
15.88
19.05
22.22
Wall thickness
0.8
0.8
0.8
1.0
1.0
1.0
Material
1/2 H, H
Copper tubing
Outer diameter
25.4
28.58
31.75
38.1
Wall thickness
1.0
1.0
1.1
1.35
Narrow tubing size
Amount of refrigerant
charge/m (g/m)
φ
6.35
26
φ
9.52
56
φ
12.7
128
φ
15.88
185
φ
19.05
259
φ
22.22
366
Required amount of charge = (Amount of refrigerant
charge per meter of each size of narrow tube
×
its tube
length) + (...) + (...)
*Always charge accurately using a scale for weighing.
Table 1-13 Indoor Unit Tubing Connection (
1
,
2
...
40
)
Unit: mm
ø22.22
(mm)
(mm)
ø15.88
ø9.52
ø6.35
ø12.7
ø19.05
Wide tubing
Narrow tubing
Indoor unit type
22
28
36
56
73
106
140
224
280
Note: Use C1220T-1/2H material for tubing over
φ
19.05.
04-396 Inverter-W_a-p50 ARGO 12/21/04 9:38 AM Page 14
