6. SYSTEM DESIGN
PIPE SIZE2-3.
PIPE DIAMETER, RECOMMENDED MATERIAL AND WALL THICKNESS
Nominal Diameter (in) 1/4" 3/8" 1/2" 5/8" 3/4"
Outside Diameter (mm) 6.35 9.52 12.70 15.88 19.05
Material JIS H3300 C1220T-O or equivalent *1
Wall Thickness *2 (mm) 0.8 0.8 0.8 1.0 1.2
 owabe tensie stress   
2
)
*2: Endurance pressure of the pipe must be 4.2 MPa.
Please select the pipe size in accordance with local rules.
PIPE SIZE SELECTION
Branch box 1 
(
3 branches
)
First 
Separation 
tube
Outdoor unit
Indoor units
Branch box 3 
(2 branches)
Pipe size 
table"A"
Pipe size 
table"B"
Pipe size 
table"C"
Pipe size 
table"D"
Second 
Separation 
tube
Branch box 2 
(
3 branches
)
- (06 - 15) -
SYSTEM
DESIGN
SYSTEM
DESIGN