11
5: If any of the tubing length exceeds 30 m, increase the size of the tubes (liquid tube, suction tube and discharge tube) between the
distribution tube and solenoid valve kit by 1 rank and also increase the size of the tubes (liquid tube and gas tube) between the solenoid
valve kit and indoor unit by 1 rank.
*
However, in the case of the Type 56 solenoid valve kit, it is not necessary to increase the tubes (liquid tube, suction tube and discharge
tube) between the distribution tube and solenoid valve kit by 1 rank
.
1-6. Tubing Size
■
Table 3 Main Tubing Size (LA)
kW 22.4 28.0 33.5 40.0 45.0 50.0 56.0 61.5 68.0 73.0 78.5 85.0 90.0 96.0
Total system
horsepower
8 10 12 14 16 18 20 22 24 26 28 30 32 34
Combined
outdoor units
8 10 12 14 16
8
10
8
12
10
12
12
12
10
16
12
16
14
16
16
16
8
10
16
Suction tube
ø19.05 ø22.22
ø25.4 ø28.58 ø31.75
Discharge tube
ø15.88 ø19.05
ø
22.22
ø25.4 ø28.58
Liquid tube ø9.52 ø12.7 ø15.88 ø19.05
kW 101 107 113 118 124 130 135
Total system
horsepower
36 38 40 42 44 46 48
Combined
outdoor units
8
12
16
10
12
16
8
16
16
10
16
16
12
16
16
14
16
16
16
16
16
Suction tube ø38.10
Discharge tube
ø28.58
ø31.75
Liquid tube ø19.05
*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 ø6.35.
*3: The refrigerant tubing should be used with R410A refrigerant.
■ 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 4 Main Tubing Size After Distribution (LB, LC...)
Total capacity after distribution
Over kW –
7.1
(2.5 HP)
16.0
(6 HP)
25.0
(9 HP)
30.0
(11 HP)
36.4
(13 HP)
42.0
(15 HP)
47.6
(17 HP)
58.8
(21 HP)
Below kW
7.1
(2.5 HP)
16.0
(6 HP)
25.0
(9 HP)
30.0
(11 HP)
36.4
(13 HP)
42.0
(15 HP)
47.6
(17 HP)
58.8
(21 HP)
70.0
(25 HP)
Tubing size
Suction tube ø15.88 ø19.05 ø19.05 ø22.22 ø25.40 ø25.40 ø28.58 ø28.58 ø28.58
Discharge tube ø12.70 ø15.88 ø15.88 ø19.05 ø19.05 ø22.22 ø22.22 ø22.22 ø25.40
Liquid tube ø9.52 ø9.52 ø9.52 ø9.52 ø12.70 ø12.70 ø12.70 ø15.88 ø15.88
Total capacity after distribution
Over kW
70.0
(25
HP
)
75.6
(27 HP)
98.0
(35 HP)
103.6
(37 HP)
Below kW
75.6
(27 HP)
98.0
(35 HP)
103.6
(37 HP)
–
Tubing size
Suction tube ø31.75 ø31.75 ø38.10 ø38.10
Discharge tube ø25.40 ø28.58 ø28.58 ø31.75
Liquid tube ø19.05 ø19.05 ø19.05 ø19.05
Table 5 Outdoor Unit Tubing Connection Size (
A – C)
kW 22.4 28.0 33.5 40.0 45.0
Suction tube
ø19.05 ø22.22 ø25.4 ø28.58
Brazing connection
Discharge tube
ø15.88 ø19.05 ø22.22
Flare
Brazing connection
Liquid tube
ø9.52 ø12.7
Flare connection
Balance tube
ø6.35
Flare connection
Unit: mm
Unit: mm
HP=horsepower Unit: mm
Balance tube
ex.) 8 HP
Suction tube
Discharge tube
Liquid tube
*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
units, then the main tube size is selected
based on the total capacity of the outdoor
units. (For LA, LB, and LF in particular)
00_341136_2WAY_Eng.indb 11 2022/9/19 9:27:13
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