Fujitsu AIRSTAGE J-II Design & Technical Manual page 460

Pipe size table "B"
z „
(Between separation tube to separation tube (header))
Total cooling capacity
of indoor unit (kW)
2.2 to 11.1
11.2 to 20.1
If the selected pipe diameter between separation tubes (based on table "B") becomes larger
 „
than the pipe diameter between outdoor unit and the first separation tube (based on table "A"),
please 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 unit
 „
connected downstream.
Pipe size table "C"
z „
(Between separation tube (header) to indoor unit)
Cooling capacity of
Model code
indoor unit (kW)
04, 07, 09, 12,
1.1, 2.2, 2.8, 3.6, 4.5
14
18, 24, 30, 34 5.6, 7.1, 9.0, 10.0
36, 45, 54 *2 11.2, 12.5, 14.0
*2: If the selected pipe diameter between separation tube (header) to indoor unit (based on
table "C") becomes larger than the pipe diameter between separation tube to separation
tube (header) (based on table "B"), please select the pipe whose diameter is equal to the one
between separation tube to 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.
Outside diameter mm (in)
Liquid pipe
9.52 (3/8") 15.88 (5/8")
9.52 (3/8") 19.05 (3/4")
Outside diameter mm (in)
Liquid pipe
6.35 (1/4")
9.52 (3/8")
9.52 (3/8")
- (06 - 18) -
Gas pipe
Gas pipe
12.70 (1/2")
15.88 (5/8")
19.05 (3/4")