• Pipe size table “B”
Between Separation tube and first Separation tube (Header)
Total cooling capacity of indoor unit
Outside diameter
Liquid pipe Gas pipe
kW mm (in)
2.2 to 11.1 9.52 (3/8) 15.88 (5/8)
11.2 to 13.9 9.52 (3/8) 19.05 (3/4)
14.0 to 19.6 12.70 (1/2) 19.05 (3/4)
19.7 to 28.0 12.70 (1/2) 22.22 (7/8)
28.1 or more 12.70 (1/2) 28.58 (1-1/8)
NOTES:
• If the selected pipe diameter between Separation tubes (based on the table “B”) becomes
larger than the pipe diameter between outdoor unit and the first Separation tube (base on the
table “A”), select the pipe whose diameter is equal to the one between outdoor unit and the
first Separation tube.
(If pipe diameter B > A, select pipe size from table A)
• “Total cooling capacity of indoor unit” is the total value for the cooling capacity of indoor units
connected downstream.
• Pipe size table “C”
Between Separation tube (Header) and indoor unit
Indoor unit model code
Indoor unit cooling capacity
Outside diameter
Liquid pipe Gas pipe
kW mm (in)
04, 07, 09 1.1, 2.2, 2.8 6.35 (1/4) 9.52 (3/8)*
12, 14, 18 3.6, 4.5, 5.6 6.35 (1/4) 12.70 (1/2)
24, 30, 34, 36, 45, 54, 60
7.1, 9.0, 10.0, 11.2, 12.5, 14.0,
18.0
9.52 (3/8) 15.88 (5/8)
72, 90 22.4, 25.0 9.52 (3/8) 19.05 (3/4)
96 28.0 9.52 (3/8) 22.22 (7/8)
NOTES:
• If the selected pipe diameter between Separation tube (Header) and indoor unit (based on the
table “C”) becomes larger than the pipe diameter between Separation tube and Separation
tube (Header), select the pipe whose diameter is equal to the one between Separation tube
and Separation tube (Header).
(If pipe diameter C > B, select pipe size from table B)
It is necessary to change a connection pipe diameter using reducer.
• *: When the pipe length between Separation tube (Header) and indoor unit exceeds 20 m,
gas pipe diameter should be 12.70 mm (1/2 in).
2-3. Pipe size
- (06-24) - 2. Piping design
SYSTEM
DESIGN
SYSTEM
DESIGN
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