Hitachi SET FREE MINI RAS-4FSNME1 Manuel D'utilisation page 20

PIPING WORK
8.3.2 Heat recovery systems
1
A
B
B
2
2
3 3
CH
CH
G
G
2
5 5
IU IU
B
3
CH-M
5 5 5
G
IU IU IU
C
C
B
3
4
4
CH
5 5
G
IU IU
4
5
5
C
IU IU
If a header branch is used instead of multi-kit
2
E
Header branch
3 3 3
CH CH CH
5 5 5
IU IU IU
!
C A U T I O N
Header branch cannot be connected to upstream or downstream piping
of CH-Box multiple.
Header branch
CH-M
CH CH
IU IU IU IU
Upstream
Downstream

Main pipe diameter (from the OU to the first branch)
Gas, low
Outdoor unit
pressure
RAS-8FSXNME1 ø19.05
RAS-10FSXNME1 ø22.20
RAS-12FSXNME1 ø25.40
20 PMML0532 rev.1 - 12/2020
Low pressure gas pipe
3
3 High/Low pressure
gas pipe
3 pipes
section
CH
2 pipes
section
3
4 5 Liquid pipe
5
4 Gas pipe
CH
G
5
3 Liquid pipe
3 Low pressure gas pipe
IU
3 High/Low pressure gas pipe
3 pipes section
CH-M
5
4 5
Gas pipe
IU
4 5
Liquid pipe
2 pipes section
5
IU
:
High/ Low pressure gas pipe
:
Gas pipe/ Liquid pipe
:
Low pressure gas pipe, liquid pipe
CH:
CH-Box (Single branch pipe)
CH-M:
CH-Box (Multiple branch pipe)
3 4
F
CH Header branch
5 5 5
IU IU IU
CH-M
Header branch
IU
IU IU
IU IU
Upstream
Downstream
Gas, high/
Liquid
low pressure
ø15.88 ø9.52
ø19.05 ø9.52
ø22.20 ø12.70
?
N O T E
When the maximum length of the equivalent refrigerant pipe from the OU
to the IU is over 100 m the pipe size of liquid line of the main pipe should
be increased by one size (with E-162XN3 or E-242XN3 (*1)).

Pipe diameter after first branch or between multi-kits and

Pipe diameter between the multi-kit and the CH-Box
Total indoor unit capacity
after the first branch (HP)
< 6
(6-8.99)
(9-11.99)
(12-15.6)
?
N O T E
• (*) CH-Box (single branch type) is not connected to liquid pipe.
• In the case that the piping length from the Multi-Kit at the first branch
to the terminal indoor unit is over 40m, the size of the main piping
should be increased by one size (with E-162XN3 or E-242XN3 (*1)).
• If the multi-kit size is larger than the first branch,adjust the multi-kit
size to the first branch. In case that the selected pipe size after the
first branch is larger than the pipe size before the first branch, use the
same pipe size as after the branch ( pipe
• If the size of the diameter between the multi-kit and the CH-Box is
larger than the main pipe diameter, adjust the diameter to the same
size as the main pipe diameter.

Pipe diameter for 2 pipes between CH-Box and multi-kit
or between multi-kits
Total indoor unit capacity
after the first branch (HP)
< 6
(6-8.99)
(9-11.99)
(12-15.6)

Pipe diameter between multi-kit and IU or between CH-
Box and IU
Indoor unit capacity (HP)
0.4-1.5
2
2.5-6.0
8.0
10.0
?
N O T E
• (*): When the liquid piping length is longer than 15m, use Ø9.52 pipe
and reducer (field-supplied).
• The pipe diameter should be the same as the indoor unit piping
connection size. Check the indoor unit connection sizes.
IU
A First branch and B multi-kits after the first branch (3
pipes section)
A
Outdoor unit HP
-
8-10
12
Gas, low Gas, high/
Liquid (*)
pressure low pressure
ø15.88 ø12.70
ø19.05 ø15.88
ø22.20 ø19.05
ø25.40 ø22.20
≥
pipe)
Gas, low
Liquid
pressure
ø15.88 ø9.52
ø19.05 ø9.52
ø22.20 ø9.52
ø25.40 ø12.70
Gas Liquid
ø12.70 ø6.35 (*)
ø12.70 / ø15.88 ø6.35 (*)
ø15.88 ø9.52
ø19.05 ø9.52
ø22.20 ø9.52
B
Model
Total indoor unit HP
<6 E-52XN3
E-102XN3
6-11.99
(*1) E-162XN3
E-162XN3
12-15.6
(*1) E-242XN3
ø9.52
ø9.52
ø9.52
ø12.70