Straight Equivalent Length Of Joints; Additional Refrigerant Charge - Panasonic U-8ME2R8 Installation Instructions Manual

Table 5 Outdoor Unit Tubing Connection Size ( A – D)
■
kW 22.4
Horsepower (HP) 8
ø19.05
Gas tube
Liquid tube
Balance tube
Table 6 Indoor Unit Tubing Connection Size
■
Indoor unit type 22
Gas tube (mm)
Liquid tube (mm)
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)
90° elbow
45° elbow
U-shape tube bent (R60-100 mm)
Trap bend
Y-branch distribution joint
Ball valve for service
Table 8 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) + (...) + (...)] + [(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
28.0 33.5 40.0
10 12 14
ø22.22 ø25.4
Brazing connection
ø9.52 ø12.7
Flare connection
ø6.35
Flare connection
28 36 45
ø12.7
ø6.35
12.7
0.30
0.23
0.90
2.30
Material Temper - 1/2 H • H
ø22.22
ø25.4
ø28.58
ø31.75
ø38.1
ø41.28
ø44.45
ø50.8
Unit: mm
45.0 50.0
16 18
ø28.58
ø15.88
56 60 73 90
ø15.88
15.88 19.05 22.22 25.4
0.35 0.42 0.48 0.52
0.26 0.32 0.36 0.39
1.05 1.26 1.44 1.56
2.80 3.20 3.80 4.30
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.
t1.0
In addition, take sufficient care to avoid
t1.0
crushing or damaging the tubes when
t1.0
bending them.
t1.1
over t1.35
over t1.45
over t1.55
over t1.8
12
56.0
20
Balance tube
Liquid tube
106 140 160
ø9.52
28.58 31.8 38.1
0.57 0.70 0.79
0.43 0.53 0.59
1.71 2.10 2.37
4.70 5.00 5.80
Gas tube
180 224 280
ø19.05 ø22.22
41.28 44.45 50.8
0.85 0.92 1.00
0.64 0.69 0.79
2.55 2.76 3.00
6.80 7.40 7.98