Hitachi RAS-FSXNSE Series Instruction Manual page 36

PIPING WORK AND REFRIGERANT CHARGE
For heat recovery systems (3 pipes)
For selecting the pipe sizes between the outdoor unit and the piping connection kit , between the piping connection kits  and for
piping connection kit Ⓐ, refer to the items from "Connection of refrigerant pipes for heat recovery system (3 pipes)" in the manual on
the CD-ROM.
Outdoor
unit A
A
1
3 2
B
C
C
4 4
5
G
G
CH
4
7
Indoor
unit
C
5
G
7
Indoor Indoor
unit unit
C
5 6 6
CH
D
G
7
6
Indoor
unit
D
7 7
Indoor
unit
(Exclusive use of cooling operation)
E
Header branch
4
5
5
CH CH
7 7
Indoor
Indoor
unit
unit
!
C a U t i o n
Header branch cannot be connected to upstream or downstream piping of CH-Box multiple.
CH
Change-over box
(Single Branch Type)
Indoor unit
Upstream
14 PMML0479 rev.4 - 11/2018
Outdoor Outdoor
unit B unit C
1 1
A
5 5
G
CH CH
7 7
Indoor Indoor
unit unit
CH-M
7 7 7
Indoor Indoor
unit
unit
D
7 7
Indoor Indoor
unit unit
High/Low pressure gas pipe, low pressure gas pipe, liquid pipe
Terminal
Indoor
Gas pipe, liquid pipe
unit
Low pressure gas pipe, liquid pipe
CH : CH-Box (Single branch type)
CH-M :
CH-Box (Multiple branch type)
5
CH
5
CH
7
Indoor
unit
Header branch
Change-over box
(Multiple Branch Type)
CH-M
CH
Indoor unit
Downstream
Low pressure
5
gas pipe
High/Low
5
pressure gas pipe
6 7
Three pipes section
Liquid pipe
5
6 7
6 7 Liquid pipe
Two pipes section
F
Header branch
6
7 7
Indoor Indoor
unit unit
Indoor unit
Upstream
Three pipes section
CH Liquid pipe
6 7
Gas pipe Two pipes section
CH-Box is not connected to liquid pipe
High/Low pressure gas pipe
5
5 Low pressure gas pipe
CH-M
Gas pipe
• • •
*3
Two pipes section
7
Indoor
unit
Change-over box
(Multiple Branch Type)
Header branch
CH-M
CH-M
Indoor unit
Downstream
Gas pipe
6 7
Liquid pipe
6 7