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1-6. Tubing Size
Table 1-3 Main Tubing Size (LA)
kW
Total system horsepower (hp)
Combined outdoor units (hp)
Suction tubing (mm)
Discharge tubing (mm)
Liquid tubing (mm)
kW
Total system horsepower (hp)
Combined outdoor units (hp)
Suction tubing (mm)
Discharge tubing (mm)
Liquid tubing (mm)
*1: If future extension is planned, select the tubing diameter based on the total horsepower after extension.
However extension is not possible if the resulting tubing size is two ranks higher.
*2: The balance tube (outdoor unit tube) diameter is ø9.52.
*3: Type 1 tubing should be used for the refrigerant tubes.
*4: If the length of the longest tube (L1) exceeds 90 m (equivalent length), increase the main tube (LM) size by 1 rank for the suction,
discharge, and liquid tubes. (Use field-supply reducers.) (Select from Table 1-3 and Table 1-8.)
*5: If the longest main tube length (LM) exceeds 50 m, increase the main tube size at the portion before 50 m by 1 rank for the suction
tubes and discharge tubes.
(For the portion that exceeds 50 m, set based on the main tube sizes (LA) listed in the table above.)
■ Size of tubing (LO) between outdoor units
Select the size of tubing between outdoor units based on the main tubing size (LA) as given in the table above.
Table 1-4 Main Tubing Size After Distribution (LB, LC...)
Total capacity after distribution
Tubing size
Total capacity after distribution
Tubing size
Table 1-5 Outdoor Unit Tubing Connection Size ( A – C)
kW
22.4
ø19.05
Suction tubing
ø15.88
Discharge tubing
Liquid tubing
Balance tubing
22.4
28.0
33.5
40.0
8
10
12
14
8
10
12
14
ø19.05 ø22.22
ø25.40
ø15.88
ø19.05
ø9.52
ø12.70
101.0 106.5 113.0 118.0 123.5 130.0 135.0
36
38
40
42
16
16
16
16
10
12
14
16
10
10
10
10
ø38.10
ø28.58
ø31.75
ø19.05
Below kW
Over kW
Suction tubing (mm)
Discharge tubing (mm) ø12.70 ø15.88 ø15.88 ø19.05 ø19.05 ø22.22 ø22.22 ø22.22 ø25.40
Liquid tubing (mm)
Below kW
Over kW
Suction tubing (mm)
Discharge tubing (mm) ø25.40 ø28.58 ø28.58 ø31.75
Liquid tubing (mm)
28.0
ø22.22
Brazing connection
ø19.05
Brazing connection
ø9.52
Brazing connection
Flare connection
45.0
50.4
56.0
16
18
20
10
10
16
8
10
ø28.58
ø28.58
ø22.22
ø15.88
44
46
48
16
16
16
16
16
16
12
14
16
7.1
16.0
25.0
(2.5 hp)
(6 hp)
(9 hp)
7.1
16.0
–
(2.5 hp)
(6 hp)
ø15.88 ø19.05 ø19.05 ø22.22 ø25.40 ø25.40 ø28.58 ø28.58 ø28.58
ø9.52
ø9.52
ø9.52
75.6
98.0
103.6
(27 hp)
(35 hp)
(37 hp)
70.0
75.6
98.0
(25 hp)
(27 hp)
(6 hp)
ø31.75 ø31.75 ø38.10 ø38.10
ø19.05 ø19.05 ø19.05 ø19.05
33.5
40.0
ø25.4
ø22.22
ø12.7
ø9.52
9
61.5
68.0
73.0
78.5
22
24
26
28
12
14
16
16
10
10
10
12
ø25.40
30.0
36.4
42.0
(11 hp)
(13 hp)
(15 hp)
25.0
30.0
36.4
(9 hp)
(11 hp)
(13 hp)
ø9.52
ø12.70 ø12.70 ø12.70 ø15.88 ø15.88
–
103.6
(37 hp)
*1: The outdoor unit connection tubing
(LO) is determined by the total capacity
of the outdoor units connected to the
tube ends. The tubing size is selected
based on the table of main tube sizes
after the branch.
*2: If the total capacity of the indoor units
connected to the tube ends is different
from the total capacity of the outdoor
45.0
units, then the main tube size is
ø28.58
selected based on the total capacity of
the outdoor units.
(For LA, LB, and LF in particular)
Unit: mm
hp=horsepower
85.0
90.0
96.0
30
32
34
14
16
16
10
14
16
10
ø31.75
ø28.58
ø19.05
hp = horsepower
47.6
58.8
70.0
(17 hp)
(21 hp)
(25 hp)
42.0
47.6
58.8
(15 hp)
(17 hp)
(21 hp)
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