11
5: When the tubing length exceeds 40 m, increase a longer liquid and gas tubing by 1 rank.
Refer to the Technical Data for the details.
6: If the total distribution tubing length exceeds 500m, maximum allowable elevation difference (H2) between the indoor units is
calculated by the following formula. Make sure the indoor unit’s actual elevation difference should fall within the figure calculated as
follows.
Unit of account (meter): 15 x (2 - total tubing length(m) ÷ 500)
7: If any of the tubing length exceeds 30m, increase the size of the liquid and gas tubes 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 18 20
12
10
12
12
16
10
16
12
16
14
16
16
20
14
Gas tube
ø19.05 ø22.22
ø25.4 ø28.58 ø31.75
Liquid tube ø9.52 ø12.7 ø15.88 ø19.05
kW 101.0 107.0 113.0 118.0 124.0 130.0 135.0 140.0 145.0 151.0 156.0 162.0 168.0 174.0
Total system
horsepower
36 38 40 42 44 46 48 50 52 54 56 58 60 62
Combined
outdoor units
20
16
20
18
20
20
16
16
10
16
16
12
16
16
14
16
16
16
20
16
14
20
16
16
20
20
14
20
20
16
20
20
18
20
20
20
16
16
16
14
Gas tube ø38.10 ø41.28
Liquid tube ø19.05
kW 180.0 185.0 190.0 196.0 202.0 208.0 213.0 219.0 224.0
Total system
horsepower
64 66 68 70 72 74 76 78 80
Combined
outdoor units
16
16
16
16
20
20
16
10
20
20
16
12
20
20
20
10
20
20
16
16
20
20
18
16
20
20
20
16
20
20
20
18
20
20
20
20
Gas tube ø41.28 ø44.45
Liquid tube ø19.05 ø22.22
* 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 ø6.35.
* The refrigerant tubing should be used with R410A refrigerant.
* If the length of the longest tube (L1) exceeds 90 m (equivalent length), increase the main tubing (LM) size by 1 rank for the
gas and liquid tubes. Select from Table 3 and Table 8. Use field-supply reducers. If the tube diameter is more than ø41.28, use field-
supply reducer.
* If the longest main tubing length (LM) exceeds 50 m, increase the main tubing size at the portion before 50 m by 1 rank for the
gas tubes.
For the portion that exceeds 50 m, set based on the main tubing size (LA) listed in the table above.
■ Size of Tubing (LO, LP) Between Outdoor Units
Calculate the total relevant horsepower connected to the tube ends of outdoor units and select the size of tubing between outdoor
units based on the main tubing size (LA) listed 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)
22.5
(8.1 HP)
30.0
(11 HP)
42.0
(15 HP)
52.4
(19 HP)
70.0
(25 HP)
98.0
(35 HP)
170.0
(61 HP)
187.0
(67 HP)
199.0
(71 HP)
Below kW
7.1
(2.5 HP)
16.0
(6 HP)
22.5
(8.1 HP)
30.0
(11 HP)
42.0
(15 HP)
52.4
(19 HP)
70.0
(25 HP)
98.0
(35 HP)
170.0
(61 HP)
187.0
(67 HP)
199.0
(71 HP)
–
Tubing
size
Gas tube ø12.7 ø15.88 ø19.05 ø22.22 ø25.4 ø28.58 ø28.58 ø31.75 ø38.1 ø41.28 ø41.28 ø44.45
Liquid tube
ø9.52 ø9.52 ø9.52 ø9.52 ø12.7 ø12.7 ø15.88 ø19.05 ø19.05 ø19.05 ø22.22 ø22.22
Note: In case the total capacity of indoor units connected after distribution exceeds the total capacity of the outdoor units,
select the main tubing size for the total capacity of the outdoor units.
Unit: mm
Unit: mm
HP = horsepower
00_340994_2WAY_Eng.indb 11 2022/8/4 14:28:27
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