Piping Branch Restrictions (Heat Recovery) - Hitachi Air 365 Series Installation And Maintenance Manual

5.11 Piping Branch Restrictions (Heat Recovery)

In the case that the piping length L2 from the Multi-Kit at
the first branch to the farthest indoor unit is over 40m.
(Example 1): Installation with Main Piping Branch
The difference between the piping length from the first
branch to the farthest indoor unit and the piping length
from the first branch to the closest indoor unit must be
within 60m.
(g+h+j)-(b+d)≤ 60m
Piping Length from the Multi-Kit at the first branch
to the terminal Indoor Unit is within 40 ~ 90m
b
a
First Branch
The Closest Indoor Unit
Multi-Kit
from the First Branch
g
(Example 2): Installation without Main Piping Branch
The difference between the piping length from the first
branch to the farthest indoor unit and the piping length
from the first branch to the closest indoor unit must be
within 60m.
(b+d+f+h) - (c) ≤60m
Piping Length from the Multi-Kit at the first branch
to the terminal Indoor Unit is within 40 ~ 90m
d
b
a
c e
First Branch
Multi-Kit
The Closest Indoor Unit
from the First Branch
NOTE:
•
Main Piping Branch: Both of the pipes branched from
a Multi-Kit are connected to the next Multi-Kits.
(including CH-Box (Multiple Branch Type).)
First Branch and
Main Piping Branch
Multi-Kit
First Branch and
Main Piping Branch
Multi-Kit
A16381E84N-rev.1
L2
e
c
d f
Terminal
Indoor Unit
L2
Terminal
j
h
Indoor Unit
i k
The Farthest Indoor Unit
from the First Branch
L2
h
f
i
g
Terminal
Indoor Unit
The Farthest Indoor Unit
from the First Branch
CH
Indoor Unit
CH
CH
CH
CH
Indoor Unit
CH
CH
First Branch and
Main Piping Branch
Multi-Kit
CH-Box
(Multiple Branch Type)
CH-Box
(Multiple Branch Type)
and Main Piping Branch
Header branch can be used with a line branch at the three
pipes segment and two pipes segment.
Header branch can also be used after the second branch.
A line branch can also be connected to a header branch.
CORRECT
First Branch
Multi-Kit for
Line Branch
Second Branch
Multi-Kit for
Header Branch
CORRECT
CH
First Branch
Multi-Kit for
Line Branch
Second Branch
Multi-Kit for
Header Branch
CORRECT
Multi-Kit for
Header Branch
CH
CH-Box
5. Refrigerant Piping Work
CH
Indoor Unit
CH
Indoor Unit
CH
CH
CH
CH
CH-Box
CH
Indoor Unit
: Three Pipes segment
: Two Pipes segment
CH
CH
CH-Box
Indoor Unit
: Three Pipes segment
: Two Pipes segment
Multi-Kit for
Line Branch
Multi-Kit for
Line Branch
78