Design Technical Manual

Table Of Contents
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Pipe diameter, in case of discharge gas pipe is not separated, is di󰀨erent between pipes
which come from outdoor unit side and connected to RB unit, Thinner piping diameter should
be selected.
z
Pipe size table "D"
Between separation tube and RB unit
Case of 1 indoor unit is connected in the downstream of separation tube.
Cooling capacity of
indoor unit (Btu/h)
Outside diameter: in. (mm)
Liquid pipe
Discharge
Gas pipe
Suction
Gas pipe
4,000, 7,500, 9,500, 12,000, 14,000 1/4" (6.35) 3/8" (9.52) 1/2" (12.70)
18,000, 24,000, 30,000, 34,000 3/8" (9.52) 1/2" (12.70) 5/8" (15.88)
36,000, 48,000 3/8" (9.52) 1/2" (12.70) 3/4" (19.05)
60,000 3/8" (9.52) 5/8" (15.88) 3/4" (19.05)
72,000, 96,000 1/2" (12.70) 3/4" (19.05) 7/8" (22.22)
z
Pipe size table "E"
Between separation tubes or RB unit and separation tube
Total cooling capacity of
indoor unit (Btu/h)
Outside diameter: in. (mm)
Liquid pipe Gas pipe
8,000 < x ≤ 36,000 3/8" (9.52) 5/8" (15.88)
36,000 < x ≤ 48,000 3/8" (9.52) 3/4" (19.05)
48,000 < x ≤ 96,500 1/2" (12.70) 7/8" (22.22)
96,500 < x ≤ 153,000 1/2" (12.70) 1-1/8" (28.58)
153,000 < x ≤ 193,000 5/8" (15.88) 1-1/8" (28.58)
193,000 < x ≤ 274,000 5/8" (15.88) 1-3/8" (34.92)
274,000 < x ≤ 325,000 3/4" (19.05) 1-3/8" (34.92)
325,000 < x 3/4" (19.05) 1-5/8" (41.27)
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If the selected pipe diameter based on table "E" becomes larger than the pipe diameter based
on table "C", select the pipe whose diameter is equal to the table "C".
Gas pipe of table"E" should be compared with suction gas pipe of table"C."
(If pipe diameter E > C, select pipe size from table C)
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SYSTEM
DESIGN
SYSTEM
DESIGN