Hitachi FSXN1E Series, Installation And Operation Manual, Page: 60 / 756

4 Pipe diameter between the CH unit and the multikit (3 pipes and 2 pipes)
(9)
.
CH unit
Maximum combination of
indoor units
(8)
Available combination of indoor
units capacity (H)
3 pipes
Gas, low pressure Gas, high/low pressure Liquid
CH-6.0N(1/2) 7
0.8 - 4.0 ø15.88 ø12.7 ø9.52
4.1 - 6.0 ø19.05 ø15.88 ø9.52
CH-10.0N(1/2) 8
6.1 - 8.0 ø19.05 ø15.88 ø9.52
8.1 - 10.0 ø22.2 ø19.05 ø9.52
5 Pipe diameter for 2 pipes and multikit.
Total HP indoor unit Gas Liquid Total HP indoor unit Gas Liquid
< 6 ø15.88 ø9.52 (12-15.99) ø25.4 ø12.7
(6-8.99) ø19.05 ø9.52 (16-17.99) ø28.58 ø12.7
(9-11.99) ø22.2 ø9.52 (18-25.99) ø28.58 ø15.88
6 Pipe diameter between multikit and indoor unit
(4)
.
HP indoor unit Gas Liquid HP indoor unit Gas Liquid
(0.8-1.5) ø12.7 ø6.35
(5)
8.0 ø19.05 ø9.52
2.0 ø15.88 ø6.35
(5)
10.0 ø22.2 ø9.52
(2.5-6.0) ø15.88 ø9.52
Pipe working conditions
For heat pump systems (2 pipes)
Part Make
Permitted pipe length
(7)
≤ Recommended number
of connected indoor units
≥ Recommended number
of connected indoor units
Total pipe length
Current total liquid
pipe length
≤ 1000 m
(8)
≤ 300 m
Maximum pipe length
Current length
L1
≤ 165 m ≤ 165 m
Equivalent length ≤ 190 m ≤ 190 m
Maximum pipe length between the multikit of the first branch
and each indoor unit
L2 ≤ 90 m ≤ 40 m
Maximum pipe length between each multikit and each indoor
unit
L3 ≤ 40 m ≤ 30 m
Pipe length between connection kit 1 and each outdoor unit L5 ≤ 10 m ≤ 10 m
Difference in height between
outdoor and indoor units
Highest outdoor unit
H1
≤ 50 m
(9)
≤ 50 m
(9)
Lowest outdoor unit ≤ 40 m ≤ 40 m
Difference in height between indoor units H2 ≤ 30 m ≤ 30 m
Difference in height between outdoor units H5 ≤ 0.1 m ≤ 0.1 m
46 PMML0294A rev.2 - 07/2014
Piping work and refrigerant charge
PMML0294A_rev.2_02-2014.indb 46 14/07/2014 12:28:29