15
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Piping installation
Installer and user reference guide
75
LREN8~12A7 + LRNUN5A7
CO₂ ZEAS outdoor unit and capacity up unit
4P704142-1 – 2022.08
a
b
a
b
a
Refrigeration indoor unit
b
Flow direction in refrigerant suction piping
To install riser piping
If the outdoor unit is installed lower than the refrigeration indoor unit, install riser
piping close to the indoor unit. When the compressor of the outdoor unit starts,
correctly installed riser piping will prevent liquid from flowing back to the outdoor
unit.
a
b
c
a
Refrigeration indoor unit
b
Riser piping close to the indoor unit (liquid pipe)
c
Oil trap
15.1.4 To select the piping size
Determine the proper size using the following tables and reference figure (only for
indication).
2
A
B
C
D
G
J
j
f
F
E
H3
H2
H1
e
d
g
c
a
b
1
3
4
4
3
H3
1
Capacity up unit (LRNUN5*)
2
Outdoor unit (LREN* )
