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6. Pipe f (between gather pipes) diameter:
Total horse power of
connected outdoors
8HP
10HP
12-14HP
16HP
18-24HP
26-34HP
36-48HP
7. Pipe g (between outdoor & gather pipe) diameter:
Outdoor horse power
8HP
10HP
12HP
14HP
16HP
Copper pipe selection:
Material
Pipe diameter (mm)
Ø6.35
Thickness (mm)
0.8
Material
Pipe diameter (mm)
Ø19.05
Thickness (mm)
1.0
Long pipe and high drop
1. Applicable range
Item
Single way total pipe length (=total liquid pipe length)
Single way max. pipe length (max. length between outdoor & indoor) actual
/ equivalent length
Main pipe actual length (length between first gather pipe & first branch pipe)
Pipe length among outdoor units (length between first gather pipe & farthest
outdoor unit)
Height difference between
indoor and outdoor
Height difference between outdoors (in the same system)
Pipe length after first branch pipe (length between first branch & farthest
indoor)
Height difference between indoors
When the pipe between the outdoor unit and its furthest indoor unit is longer than 90m, the specification of master
pipe (Gas pipe/ Liquid pipe) between outdoor unit and the first Y joint should be upgraded for one level. For more
details, please refer to "Outdoor pipe selection table"
When the pipe between the first Y joint and its furthest indoor unit is longer than 40m,
(1) The specification of the master pipe (Gas pipe/ Liquid pipe) between the first Y joint and its furthest indoor unit
should be upgraded for one level.
(2) The distance between the furthest indoor unit and the nearest one ≤ 40m.
Gas pipe
HP gas pipe
19.05
22.22
25.4
28.58
28.58
31.8
38.1
Gas pipe
HP gas pipe
19.05
19.05
22.22
19.05
25.4
22.22
25.4
22.22
28.58
25.4
O type pipe: Soft pipe
Ø9.52
Ø12.7
0.8
1.0
Ø22.22
Ø25.4
1.0
1.0
Model
Outdoor is upper
Outdoor is lower
Liquid pipe
19.05
9.52
19.05
9.52
22.22
12.7
25.4
12.7
25.4
15.88
28.58
19.05
34.9
19.05
Liquid pipe
9.52
9.52
12.7
12.7
12.7
Ø15.88
Ø19.05
1.0
1.1
Hard pipe
Ø28.58
Ø31.8
1.0
1.1
Within 5m (better be horizontal)
69
Oil pipe
9.52
9.52
9.52
9.52
9.52
Ø34.9
Ø38.1
Ø41.3
1.3
1.4
1.5
All outdoors
Max. 300m
150m / 175m
Max. 110m
Max. 10m
Max. 50m
Max. 40m
Max. 40m
Max. 15m
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