Fujitsu AIRSTAGE J-IIIL Design & Technical Manual page 545

• Pipe size table "B"
Between Separation tube and first Separation tube (Header)
Total cooling capacity of indoor unit (x)
8,000 ≤ x < 36,000
36,000 ≤ x < 48,000
48,000 ≤ x < 66,000
66,000 ≤ x < 96,500
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 cooling capacity
4,000, 7,500, 9,500
12,000, 14,000, 18,000
24,000, 30,000, 34,000, 36,000, 48,000, 60,000
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 65 ft (20
m), gas pipe diameter should be 1/2 in (12.70 mm).
2-3. Pipe size
Btu/h
96,500 ≤ x
Btu/h
72,000
96,000
Outside diameter
Liquid pipe
3/8 (9.52)
3/8 (9.52)
1/2 (12.70)
1/2 (12.70)
1/2 (12.70)
Outside diameter
Liquid pipe
1/4 (6.35)
1/4 (6.35)
3/8 (9.52)
3/8 (9.52)
3/8 (9.52)
- (06-23) -
Gas pipe
in (mm)
5/8 (15.88)
3/4 (19.05)
3/4 (19.05)
7/8 (22.22)
1-1/8 (28.58)
Gas pipe
in (mm)
3/8 (9.52)*
1/2 (12.70)
5/8 (15.88)
3/4 (19.05)
7/8 (22.22)
2. Piping design