11
3P477778-7G English
7 .5 .
System piping (length) limitations
<Example of refrigerant piping (8 indoor units are connected)>
A
B
C
E
B1
B2
B3
1
2
4
5
6
7
8
3
D
a
b
c
d
e
f
g
h
i
j
k
m
n
o
p
H1
H3
H2
t
r
: Indoor units (cooling/heating
selectable)
: Branch Selector unit (multi)
: Branch Selector unit (single)
B1
B3
B2
-
1
7
: Indoor unit (cooling only)
(*3)
8
REFNET joint (A-E)
,
Outdoor unit
Outdoor unit
First outdoor unit
multi connection
piping kit (*1)
(*1) “
” represents an outdoor unit multi connection piping kit.
The outdoor unit multi connection piping kit must always be installed horizontally, paying attention to the installation restrictions indicated in
8. Precautions on refrigerant piping
on page 14.
<Example of connection>
Outdoor unit
side
Indoor unit
side
Branch Selector
unit
(1)
(2)
(1) Piping from outdoor units to Branch Selector units
Suction gas pipe
High/low pressure gas pipe
Liquid pipe
(3 lines):
3 pipes
(2) Piping from Branch Selector units to the indoor units, and from refrigerant branch kits to the cooling-only indoor units
(*2)
(2 lines):
2 pipes
(Suction) gas pipe
Liquid pipe
(*2) The 2-line gas pipe that is branched from the 3-line pipe and goes to the cooling-only indoor units should be connected to the suction gas pipe.
(*3) Cooling-only units should make up ≤50% of the total capacity of indoor units.
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