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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
Total system
8
horsepower
Combined
8
outdoor units
Suction tube
ø19.05 ø22.22
Discharge tube
ø15.88
Liquid tube
ø9.52
kW
101
Total system
36
horsepower
8
Combined
12
outdoor units
16
Suction tube
Discharge tube
ø28.58
Liquid tube
*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
Tubing size
Total capacity after distribution
Tubing size
Table 5 Outdoor Unit Tubing Connection Size ( A – C)
kW
22.4
ø19.05
Suction tube
ø15.88
Discharge tube
Flare
Liquid tube
Balance tube
28.0
33.5
40.0
45.0
10
12
14
16
10
12
14
16
ø25.4
ø19.05
ø12.7
107
113
118
124
38
40
42
44
10
8
10
12
12
16
16
16
16
16
16
16
ø38.10
ø31.75
ø19.05
Over kW
Below kW
(2.5 HP)
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
Over kW
(25 HP)
Below kW
(27 HP)
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
28.0
33.5
ø22.22
Brazing connection
ø19.05
Brazing connection
ø9.52
Flare connection
ø6.35
Flare connection
50.0
56.0
61.5
18
20
22
8
8
10
10
12
12
ø28.58
ø22.22
ø15.88
130
135
46
48
14
16
16
16
16
16
7.1
16.0
–
(2.5 HP)
(6 HP)
7.1
16.0
25.0
(6 HP)
(9 HP)
(11 HP)
ø9.52
ø9.52
ø9.52
70.0
75.6
98.0
(27 HP)
(35 HP)
(37 HP)
75.6
98.0
103.6
(35 HP)
(37 HP)
40.0
45.0
ø25.4
ø28.58
ø22.22
ø12.7
Unit: mm
11
68.0
73.0
78.5
24
26
28
12
10
12
12
16
16
ø25.4
25.0
30.0
36.4
(9 HP)
(11 HP)
(13 HP)
30.0
36.4
42.0
(13 HP)
(15 HP)
ø9.52
ø12.70 ø12.70 ø12.70 ø15.88 ø15.88
*1: The outdoor unit connection tubing (LO)
103.6
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)
ex.) 8 HP
Liquid tube
Discharge tube
Unit: mm
85.0
90.0
96.0
30
32
34
8
14
16
10
16
16
16
ø31.75
ø28.58
ø19.05
HP=horsepower Unit: mm
42.0
47.6
58.8
(15 HP)
(17 HP)
(21 HP)
47.6
58.8
70.0
(17 HP)
(21 HP)
(25 HP)
Balance tube
Suction tube
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