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1-7. Straight Equivalent Length of Joints
Design the tubing system by referring to the following table for the straight equivalent length of joints.
Table 6 : Straight Equivalent Length of Joints
Gas tubing size (mm)
90° elbow
45° elbow
U-shape tube bent (R60-100 mm)
Trap bend
Y-branch distribution joint
Ball valve for service
Table 7 : Refrigerant Tubing
Tubing size (mm)
Material Temper - O
ø6.35
t0.8
ø9.52
t0.8
ø12.7
t0.8
ø15.88
t1.0
ø19.05
t1.2
1-8. Additional Refrigerant Charge
Additional refrigerant charge amount is calculated below.
Required amount of additional refrigerant charge = [ (Amount of additional refrigerant charge per meter of each size of liquid tube ×
its tube length) + (...) + (...) ]
*Always charge accurately using a scale for weighing.
* If the total amount of refrigerant for the system exceeds 24 kg, change the size of the tubing to reduce the amount of refrigerant.
Table 8 : Amount of Additional Refrigerant Charge Per Meter, According to Liquid Tubing Size
Liquid tubing size (mm)
Amount of additional
refrigerant charge/m (g/m)
Table 9 : Refrigerant Charge Amount at Shipment (for Outdoor Unit)
8 HP
10 HP
6.3 k g
6.6 k g
12.7
0.30
0.23
0.90
2.30
Equivalent length conversion not needed.
Equivalent length conversion not needed.
Material Temper - 1/2 H • H
ø22.22
ø25.4
6.35
9.52
12.7
26
56
128
15.88
19.05
22.22
0.35
0.42
0.48
0.26
0.32
0.36
1.05
1.26
1.44
2.80
3.20
3.80
* When bending the tubes, use a bending
radius that is at least 4 times the outer
diameter of the tubes.
t1.0
In addition, take sufficient care to avoid
crushing or damaging the tubes when
t1.0
bending them.
* Use the material of temper - 1/2 H or - H
for tubing ø22.22 or more.
12
25.4
0.52
0.39
1.56
4.30
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