Hitachi SET FREE Serie Manual De Instrucciones página 35

PIPING WORK AND REFRIGERANT CHARGE
 Pipe diameter between the Multi-Kit and the CH-Box.
CH-Box model
type
Ⓖ
CH-AP160SSX
single
CH-AP280SSX
CH-AP04MSSX
CH-AP08MSSX
multiple
CH-AP12MSSX
CH-AP16MSSX
?
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
Example 1
Total piping
length
Example 2 d+e+f+g+h
Example 1
Maximum
piping length
Example 2
Piping length -
Equivalent
-
length

Example 1: Line branch (including main pipe
branch)
Outdoor
unit A
a
First branch
Multi-kit
25 PMML0479 rev.2 - 02/2018
number of
connectable
Branch
indoor unit per
branch
1 1 - 7 *1
1 1 - 8 *1
4 1 - 6 *2
8 1 - 6 *2
12 1 - 6 *2
16 1 - 6 *2
Description
a+b+c
Total length of all liquid
pipes (sum)
a+c Actual length of the liquid
pipe from outdoor unit stop
valve or piping connecting
f+h
kit to the terminal unit.
Actual length of líquid pipe,
not taking into account
additional charge losses
in the installation, such as
bends or elbows
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.
c
b
Terminal
Indoor unit
indoor unit
A B
available combination of
indoor unit capacity (HP)
per CH-Box per Branch
0.8 - 4.0
6.0
4.1 - 6.0
6.1 - 8.0
10.0
8.1 - 10.0
16.0 6.0 or less
30.0 6.0 or less
30.0 6.0 or less
30.0 6.0 or less

Example 2: using piping connection kit
Outdoor
unit B
e
Piping connection kit
First branch
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.
Main pipe
branch
low High/low
pressure pressure
gas gas
15.88 12.7
19.05 15.88
19.05 15.88
22.20 19.05
Refer to the Pipe Diameter after First
Branch(3 Pipes).
Outdoor
unit A
f
h
d
g
Terminal
Indoor unit
indoor unit
A B
a b
c
Indoor unit
d
e
f
liquid
9.52
9.52
9.52
9.52