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■ Table 5 Outdoor Unit Tubing Connection Size ( A – D)
kW 22.4 28.0 33.5 40.0 45.0 50.0 56.0
Horsepower (HP) 8 10 12 14 16 18 20
Gas tube
ø19.05 ø22.22 ø25.4 ø28.58
Brazing connection
Liquid tube
ø9.52 ø12.7 ø15.88
Flare connection
Balance tube
ø6.35
Flare connection
■ Table 6 Indoor Unit Tubing Connection Size
Indoor unit type 22 28 36 45 56 60 73 90 106 140 160 180 224 280
Gas tube (mm) ø12.7 ø15.88 ø19.05 ø22.22
Liquid tube (mm) ø6.35 ø9.52
Note: Use the material of temper - 1/2 H or - H for tubing over ø22.22.
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 7 Straight Equivalent Length of Joints
Gas tubing size (mm) 12.7 15.88 19.05 22.22 25.4 28.58 31.8 38.1 41.28 44.45 50.8
90° elbow 0.30 0.35 0.42 0.48 0.52 0.57 0.70 0.79 0.85 0.92 1.00
45° elbow 0.23 0.26 0.32 0.36 0.39 0.43 0.53 0.59 0.64 0.69 0.79
U-shape tube bent (R60-100 mm) 0.90 1.05 1.26 1.44 1.56 1.71 2.10 2.37 2.55 2.76 3.00
Trap bend 2.30 2.80 3.20 3.80 4.30 4.70 5.00 5.80 6.80 7.40 7.98
Y-branch distribution joint Equivalent length conversion not needed.
Ball valve for service Equivalent length conversion not needed.
Table 8 Refrigerant Tubing
Tubing size (mm)
Material Temper - O Material Temper - 1/2 H • H
ø6.35 t0.8 ø22.22 t1.0
ø9.52 t0.8 ø25.4 t1.0
ø12.7 t0.8 ø28.58 t1.0
ø15.88 t1.0 ø31.75 t1.1
ø19.05 t1.2 ø38.1 over t1.35
ø41.28 over t1.45
ø44.45 over t1.55
ø50.8 over t1.8
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) + (...) + (...)] + [(Necessary amount of additional refrigerant charge per outdoor unit) + (...) + (...)]
*Always charge accurately using a scale for weighing.
* If the existing tubing is used and the amount of on-site refrigerant charge exceeds the value listed below, change the size of the tubing
to reduce the amount of refrigerant.
Total amount of refrigerant for the system with 1 outdoor unit: 50 kg
Total amount of refrigerant for the system with 2 outdoor units: 80 kg
Total amount of refrigerant for the system with 3 outdoor units or 4 outdoor units: 105 kg
* 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.
Balance tube
Liquid tube
Gas tube
Unit: mm
00_340994_2WAY_Eng.indb 12 2022/8/4 14:28:28
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