Pipe Size Selection
7.5.1 Heat Pump 50Hz/60Hz, Cooling Only 50Hz (RX(Y)Q5~54P, 50PH)
Pipe size selection
Piping between Outdoor unit and first refrigerant branch kit.
Piping between first Outdoor unit multi connection piping kit and first refrigerant branch kit. (Part A)
! Choose from the following table in accordance with the outdoor unit capacity type.
! Choose from the following table in accordance with the total capacity type of all the outdoor
(See 7.7 Note 1)
Temper grade and wall thickness for pipes.
(Temper grade, O type and 1/2H type indicate the material types specified in JIS H 3300.)
Copper tube O.D
Copper tube W.T
The thickness of the pipes in the table shows the requirements of Japanese
High Pressure Gas Control low. (As of Jan. 2003)
The thickness and material shall be selected in accordance with local code.
For the multi outdoor unit system, select in accordance with the following figure.
Piping between Outdoor unit multi connection piping kits. (Part B)
Piping between outdoor unit and Outdoor unit multi connection piping kit. (Part C)
units connected above Outdoor unit multi connection piping kit.
Outdoor unit capacity type
φ9.5 φ12.7 φ15.9 φ19.1 φ22.2 φ25.4 φ28.6 φ31.8 φ34.9 φ38.1 φ41.3
Piping size (O.D.)