Design Technical Manual

Table Of Contents
z
Pipe size table "B"
Between outdoor unit branch kits or outdoor unit branch kit and rst separation tube
Nominal cooling capacity of
outdoor unit
[Btu/h (Ton)]
Outside diameter: in. (mm)
Liquid pipe
Discharge
Gas pipe
Suction
Gas pipe
72,000 (6) 1/2" (12.70) 5/8" (15.88) 7/8" (22.22)
96,000 (8) 1/2" (12.70) 3/4" (19.05) 7/8" (22.22)
120,000 (10) 1/2" (12.70) 3/4" (19.05) 1-1/8" (28.58)
144,000 (12) 1/2" (12.70) 7/8" (22.22) 1-1/8" (28.58)
168,000 (14)
192,000 (16)
5/8" (15.88) 7/8" (22.22) 1-1/8" (28.58)
216,000 (18)
240,000 (20)
264,000 (22)
5/8" (15.88) 1-1/8" (28.58) 1-3/8" (34.92)
288,000 (24) 3/4" (19.05) 1-1/8" (28.58) 1-3/8" (34.92)
¾
Discharge gas pipe size selection :
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 "C"
Between separation tubes or separation tube and RB unit
Case of some indoor units are connected in the downstream of separation tube.
Total cooling capacity of
indoor unit (x)
(Btu/h)
Outside diameter: in. (mm)
Liquid pipe
Discharge
Gas pipe
Suction
Gas pipe
8,000 < x ≤ 36,000 3/8" (9.52) 1/2" (12.70) 5/8" (15.88)
36,000 < x ≤ 48,000 3/8" (9.52) 1/2" (12.70) 3/4" (19.05)
48,000 < x ≤ 72,000 1/2" (12.70) 5/8" (15.88) 7/8" (22.22)
72,000 < x ≤ 96,500 1/2" (12.70) 3/4" (19.05) 7/8" (22.22)
96,500 < x ≤ 153,000 1/2" (12.70) 3/4" (19.05) 1-1/8" (28.58)
153,000 < x ≤ 161,000 5/8" (15.88) 3/4" (19.05) 1-1/8" (28.58)
161,000 < x ≤ 193,000 5/8" (15.88) 7/8" (22.22) 1-1/8" (28.58)
193,000 < x ≤ 274,500 5/8" (15.88) 1-1/8" (28.58) 1-3/8" (34.92)
274,500 < x ≤ 325,000 3/4" (19.05) 1-1/8" (28.58) 1-3/8" (34.92)
325,000 < x 3/4" (19.05) 1-1/8" (28.58) 1- 5/8" (41.27)
¾
If the selected pipe diameter between separation tubes (based on table "C") becomes larger
than the pipe diameter between outdoor unit branch kit and the rst separation tube (based on
table "B"), select the pipe whose diameter is equal to the one between outdoor unit branch kit
and the rst separation tube.
(If pipe diameter C > B, select pipe size from table B)
¾
Discharge gas pipe size selection :

When indoor unit of cooling only type is connected, it calculates with the value except
capacity of cooling only type.
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SYSTEM
DESIGN
SYSTEM
DESIGN