System Piping (Length) Limitations; Precautions On Refrigerant Piping - Daikin REYQ72TAYCU Manuel D'installation

7 .5 . System piping (length) limitations
<Example of refrigerant piping (8 indoor units are connected)>
First outdoor unit
Outdoor unit
multi connection
piping kit (*1)
r
a
b
A
d
B1
g
e f
D
1 2
(*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>
(1)
Outdoor unit Branch Selector
side
(1) Piping from outdoor units to Branch Selector units
Suction gas pipe
(3 lines): 3 pipes
High/low pressure gas pipe
Liquid pipe
(2) Piping from Branch Selector units to the indoor units, and from refrigerant branch kits to the cooling-only indoor units (*2)
(Suction) gas pipe
(2 lines): 2 pipes
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.
11
Outdoor unit
B2
,
t
REFNET joint (A-E)
c
B
j
B2
k
i
h
3 4 5
(2)
Indoor unit
unit side
B1 : Branch Selector unit (multi)
B3 : Branch Selector unit (single)
C
B3
m
E
n
6 7
1 - 7 : Indoor units (cooling/heating
selectable)
8 : Indoor unit (cooling only)
(*3)
p
o
8
3P362438-9J English