Copper Pipes, Sizes And Connection; Copper Pipes And Sizes - Hitachi UTOPIA R32 Series Technical Catalogue

9 Piping work and refrigerant charge

Copper pipes, sizes and connection

4 indoor units system
1
Total Indoor Unit capacity after
branch pipe 1+2 or 3+4
≤ 1.5 HP
from 1.8 to 2.0 HP
≥ 2.3 HP
?
N O T E
Recomended capacity ratio for 4 indoor units system:
Capacity indoor unit 1+2 / Capacity 1+2+3+4 < 60%
Capacity indoor unit 3+4 / Capacity 1+2+3+4 < 60%
If the capacity ratio of branch of indoor units 1 and 2 is bigger than 60 % of total capacity of the system or capacity ratio of branch of
indoor unit 3 and 4 is bigger than 60 % of total capacity of the system, please contact with your Hitachi Dealer or Hitachi Customer Service
Department.
9.3 Copper pipes, sizes and connection

9.3.1 Copper pipes and sizes

1 Prepare locally-supplied copper pipes.
2 Select the pipe size of a suitable thickness and material. Use the table below to select the required piping.
Nominal diameter
(according to European Standards EN-12735-1)
(mm)
Ø6.35
Ø9.52
Ø12.70
Ø15.87
Ø19.05
3 Select clean copper pipes. Make sure there is no dust and moisture inside. Blow the inside of the pipes through with
oxygen-free nitrogen to remove any dust and foreign materials before connecting pipes.
4 After connecting the refrigerant piping, seal the open space between the knockout hole and refrigerant pipes by using
insulation material as shown below:
Bracket or tape (Field supplied)
90 TCGB0136 rev.1 - 05/2021
2
1 2 3
(mm)
Pipe Size (B, C)
Branch line
Gas Liquid
Ø12.70 Ø6.35
Ø15.88 Ø6.35
Ø15.88 Ø9.52
(in.)
1/4
3/8
1/2
5/8
3/4
Insulation (Field supplied)
Insulation (Field supplied).
Outdoor Unit HP
4 / 5 / 6
4
Indoor Unit

capacity
E-102SN4 ≤ 1.5 HP
E-102SN4 1.8/2.0HP
E-102SN4 ≥ 2.3 HP
Minimum thickness (mm)
0.80
0.80
0.80
1.00
1.00
Field-supplied refrigeration piping
Pipe Size (A)
Branch pipe
Gas Liquid
Ø15.88 Ø9.52 E-102SN4
Pipe Size (D, E, F, G)
Gas Liquid
Ø12.70 Ø6.35
Ø15.88 Ø6.35
Ø15.88 Ø9.52
Copper type
Coil (Soft)
Coil (Soft)
Coil (Soft)
Straight lengths (half hard) / Coil (Soft)
Coil (Soft)
(mm)
