Hitachi RAS-10FSXNPE, Instruction Manual

Page: 38 / 170


Pipe diameter between the Multi-Kit and the CH-Box.
type
CH-Box model
Ⓖ
Branch
number of
connectable
indoor unit per
branch
available combination of
indoor unit capacity (HP)
low
pressure
gas
High/low
pressure
gas
liquid
per CH-Box per Branch
single
CH-AP160SSX 1 1 - 7 *1 6.0
0.8 - 4.0 15.88 12.7 9.52
4.1 - 6.0 19.05 15.88 9.52
CH-AP280SSX 1 1 - 8 *1 10.0
6.1 - 8.0 19.05 15.88 9.52
8.1 - 10.0 22.20 19.05 9.52
multiple
CH-AP04MSSX 4 1 - 6 *2 16.0 6.0 or less
Refer to the Pipe Diameter after First
Branch(3 Pipes).
CH-AP08MSSX 8 1 - 6 *2 30.0 6.0 or less
CH-AP12MSSX 12 1 - 6 *2 30.0 6.0 or less
CH-AP16MSSX 16 1 - 6 *2 30.0 6.0 or less
?
n o t e
• *1: When multiple indoor units are connected to the same CH-Box, they are controlled with the same operation mode.
• *2: The indoor units connected to the same branch of the CH-Box are controlled with the same operation mode.
• The liquid pipe is not required to connect to the CH-Box.
• In case that the number of connectable indoor unit exceeds four, the high/low pressure gas pipe, gas pipe and liquid pipe need to increase one
size respectively.
8.2.2 Examples
term symbol Description
Total piping
length
Example 1 a+b+c
Total length of all liquid
pipes (sum)
Example 2 d+e+f+g+h
Maximum
piping length
Example 1 a+c Actual length of the liquid
pipe from outdoor unit stop
valve or piping connecting
kit to the terminal unit.
Example 2 f+h
Piping length -
Actual length of líquid pipe,
not taking into account
additional charge losses
in the installation, such as
bends or elbows
Equivalent
length
-
This length is obtained
by converting additional
charge losses in the
installation, such as bends
or elbows, to the equivalent
length of straight pipe, and
adding this value to the
actual length.

Example 1: Line branch (including main pipe
branch)
a
b
c
A B
Outdoor
unit A
Indoor unit
Terminal
indoor unit
First branch
Multi-kit

Example 2: using piping connection kit
e
f
d
g
h
A B
Outdoor
unit A
Outdoor
unit B
Indoor unit
Terminal
indoor unit
First branch
Piping connection kit
Multi-kit
?
n o t e
The main pipe branch is the piping branch method where multi-kits are
connected to the pipes both after the first branch.
a b
c
e
f
d
Indoor unit
Main pipe
branch
PIPING WORK AND REFRIGERANT CHARGE
PMML0479 rev.4 - 11/2018 16