Design Technical Manual

Table Of Contents
2-3. PIPE SIZE
PIPE DIAMETER, RECOMMENDED MATERIAL AND WALL THICKNESS
Nominal Diameter (in.) 1/4" 3/8" 1/2" 5/8" 3/4" 7/8" 1-1/8" 1-3/8" 1-5/8"
Outside Diameter (mm) 6.35 9.52 12.70 15.88 19.05 22.22 28.58 34.92 41.27
Material JIS H3300 C1220T-O or equivalent *1 JIS H3300 C1220T-H or equivalent *2
Wall Thickness *3
(in.) 0.032 0.032 0.032 0.039 0.047 0.039 0.039 0.047 0.056
(mm) 0.8 0.8 0.8 1.0 1.2 1.0 1.0 1.2 1.43
*1: Allowable tensile stress ≥ 33 (N/mm
2
)
*2: Allowable tensile stress ≥ 61 (N/mm
2
)
*3: Operating pressure of the pipe must be 609psi (4.2 MPa)
.
Select the pipe size in accordance with the regional standard.
Outdoor
unit1
(Master)
Outdoor unit branch kit
First separation tube (for 3pipes)
Single type
of RB unit
Multi type
of RB unit
separation tube (for 3pipes)
separation tube
(for 2pipes)
Pipe size
(table"A")
Pipe size
(table"B")
Pipe size
(table"C")
Pipe size
(table"F")
Pipe size
(table"E")
Pipe size
(table"D")
Outdoor
unit2
(Slave1)
Outdoor
unit3
(Slave2)
PIPE SIZE SELECTION
Caution
Use the following tables to select the Refrigeration Pipe Size, Separation Tubes and Headers.
z
Pipe size table "A"
Between outdoor unit to outdoor unit branch kit
Ton
Model
code
Outdoor unit cooling
capacity
(Btu/h)
Outside diameter: in. (mm)
Liquid pipe
Discharge
Gas pipe
Suction
Gas pipe
6 72 72,000 1/2" (12.70) 5/8" (15.88) 7/8" (22.22)
8 96 96,000 1/2" (12.70) 3/4" (19.05) 7/8" (22.22)
10 120 120,000 1/2" (12.70) 3/4" (19.05) 1-1/8" (28.58)
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SYSTEM
DESIGN
SYSTEM
DESIGN