To Select The Piping Size - Daikin LRYEN10A7Y1 Installation And Operation Manual

Requirement
Piping length between
LRYEN10* and LRNUN5*
Maximum branch piping length
▪ Example refrigeration side:
(a)
▪ C+D+(E or F)
(a)
▪ c+d+(e or f)
▪ c+g
▪ j
▪ Example air conditioner side:
(a)
▪ B2+(C2 or D2)
(a)
▪ b2+(c2 or d2)
Maximum Outdoor higher
height than indoor
difference
Example: H2,
between
H4≤Limit
outdoor unit
Outdoor unit
and indoor
lower than
(b)
unit
indoor unit
Example: H2,
H4≤Limit
Maximum height difference
between blower coil and
showcase
▪ Example: H3≤Limit
Maximum height difference
between air conditioners
▪ Example: H1≤Limit
(a)
Whichever is longer
(b)
For low load restrictions, see 'Constraints for refrigeration' in the
Installer and user reference guide.
(c) You may have to install an oil trap. See
trap" [ 4 21].
To install an oil trap
If the outdoor unit is installed higher than the refrigeration indoor
unit, install an oil trap in the gas piping every 5 meter. Oil traps will
make the oil return more easily.
13.1.4

To select the piping size

Determine the proper size using the following tables and reference
figure (only for indication).
LRYEN10A7Y1+LRNUN5A7Y1
CO₂ Conveni-Pack outdoor unit and capacity up unit
4P605461-1D – 2023.08
Limit
LRYEN10* LRYEN10* +
LRNUN5*
Not specified, but piping must be
horizontal
Refrigeration side: 50 m
Air conditioning side: 30 m
(c)
35 m
10 m
5 m
0.5 m
"To install an oil
c
b
a
c
a Showcase
b Height difference=5 m
c Trap
The refrigerant suction piping must always run down:
b
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.
b
a
c
a Refrigeration indoor unit
b Riser piping close to the indoor unit (gas pipe)
c Oil trap
13 Piping installation
a
a
Installation and operation manual
21