Specifications

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 conv
ersion 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
ø9.52ø6.35
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 φ19.05.
04-396 Inverter-W_a-p50 ARGO 12/21/04 9:38 AM Page 14