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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 Size
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.
• Total tubing length ≤ 50 m
No additional charge will be necessary.
• Total tubing length > 50 m
Required amount of additional refrigerant charge = [ (Amount of additional refrigerant charge per meter of each size of liquid tube ×
its tube length) + (...) - 2,800 ]
In the case of the required amount of additional refrigerant charge < 0, the additional refrigerant charge should be 0 kg.
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)
4 HP
5 HP
6.7 k g
12.7
0.30
0.23
0.90
2.30
Equivalent length conversion not needed.
Equivalent length conversion not needed.
* When bending the tubes, use a bending
radius that is at least 4 times the outer
diameter of the tubes.
In addition, take sufficient care to avoid
crushing or damaging the tubes when
bending them.
6.35
9.52
12.7
26
56
128
6 HP
15.88
19.05
0.35
0.42
0.26
0.32
1.05
1.26
2.80
3.20
12
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