Unit: mm
(mm)
(mm)
–
70.0
(25 hp)
58.8
(21 hp)
7.1
(2.5 hp)
7.1
(2.5 hp)
98.0
(35 hp)
–
103.6
(37 hp)
25.0
(9 hp)
16.0
(6 hp)
16.0
(6 hp)
25.0
(9 hp)
75.6
(27 hp)
103.6
(37 hp)
98.0
(35 hp)
75.6
(27 hp)
70.0
(25 hp)
30.0
(11 hp)
30.0
(11 hp)
36.4
(113 hp)
36.4
(13 hp)
Below kW
Over kW
42.0
(15 hp)
42.0
(15 hp)
47.6
(17 hp)
47.6
(17 hp)
58.8
(21 hp)
Total capacity
after distribution
Tubing size
Suction tubing
(mm)
Liquid tubing
Discharge tubing
hp = horsepower
(mm)
(mm)
Below kW
Over kW
Total capacity
after distribution
Tubing size
Suction tubing
(mm)
Liquid tubing
Discharge tubing
3432
85.0
30
78.5
28
73.0
2610
28.0
33.5
12
14
40.0 45.0
16 18
50.4
8
10
10 10
56.0
20
22
61.5
10
14
10
10
10
16
12
16
14
14
10
10
16
12
10
16
14
10
16
16
10
16
16
12
16
16
14
16
16
16
16
16 16
16
68.0
24
22.4
8
90.0
101.0 106.5 113.0 118.0
40 42 44 46 48
135.0130.0123.5
3836
96.0
14 16
12
10 12
8
10
kW
Total system
horsepower
Total system
horsepower
Combined
outdoor units
Combined
outdoor units
Suction tubing (mm)
Suction tubing (mm)
Discharge tubing (mm)
Liquid tubing (mm)
Discharge tubing (mm)
Liquid tubing (mm)
kW
*1:
*2:
Tubing size
Main Tubing Size (LA)
ø38.10
ø31.75
ø19.05
ø28.58
ø9.52
ø15.88
ø19.05
ø22.22
ø28.58
ø25.4
ø28.58
ø31.75
ø28.58
ø19.05
ø25.40
ø22.22
ø12.70
ø15.88
ø19.05
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.
Main Tubing Size After Distribution (LB, LC...)
Unit: mm
If the total capacity of the indoor units connected to the tube ends is different from the total capacity of the outdoor units,
then the main tube size is selected based on the total capacity of the outdoor units.
(For LA, LB, and LF in particular)
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.
ø15.88
ø12.70
ø9.52
ø31.75
ø19.05
ø25.4 ø28.58
ø31.75
ø19.05 ø19.05
ø28.58
ø38.10
ø38.10
ø31.75
ø19.05
ø19.05
ø15.88
ø9.52 ø9.52
ø15.88
ø19.05
ø22.22
ø19.05
ø9.52
ø12.70
ø19.05
ø25.4
ø25.4
ø22.22
ø12.70
ø12.70 ø15.88
ø22.22
ø28.58
ø28.58
ø25.40
ø15.88
ø28.58
ø22.22
*1:
*2:
*3:
*4:
*5:
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.
The balance tube (outdoor unit tube) diameter is ø9.52.
Type 1 tubing should be used for the refrigerant tubes.
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.)
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 the table above “Main Tubing Size (LA)” and
the next page’s table “Refrigerant tubing”.)
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