Daikin LRNUN-AY1, Installation And Operation Manual

Page: 18 / 44

13 Piping installation
Installation and operation manual
18
LRYELRNUN5A7Y1
CO ₂ Conveni-Pack outdoor unit and capacity up unit
4P605461-1B – 2020.08
Piping type Outer
diameter
(Ø)
Temper
grade
Thickness
(t)
(a)
Liquid piping 15.9 mm
(5/8")
R300
(drawn)
≥1.05 mm
t
Ø
Gas piping 19.1 mm
(3/4")
R300
(drawn)
≥1.30 mm
(a) Depending on the applicable legislation and the maximum
working pressure of the unit (see "PS High" on the unit name
plate), larger piping thickness might be required.
13.1.3 Refrigerant piping length and height
difference
Requirements and limits
The piping lengths and height differences must comply with the
following requirements. For an example, see
"13.1.4 To select the
piping size" [
4
18].
Requirement Limit
LRYEN10* LRYEN10* +
LRNUN5*
Maximum total piping length
Examples:
▪ A+B+C+D+(E or F)
(a)
≤Limit
▪ a+c+d+(e or f)
(a)
≤Limit
▪ A2+B2+(C2 or D2)
(a)
≤Limit
▪ a2+b2+(c2 or d2)
(a)
≤Limit
Refrigeration side: 130 m
Air conditioning side: 130 m
Piping length between
LRYEN10* and LRNUN5*
Not specified, but piping must be
horizontal
Maximum actual piping length
▪ Example refrigeration side:
▪ C+D+(E or F)
(a)
▪ c+d+(e or f)
(a)
▪ c+g
▪ j
▪ Example air conditioner side:
▪ B2+(C2 or D2)
(a)
▪ b2+(c2 or d2)
(a)
Refrigeration side: 50 m
Air conditioning side: 30 m
Maximum
height
difference
between
outdoor unit
and indoor
unit Outdoor higher
than indoor
Example: H2,
H4≤Limit
35 m
"To install an oil trap" [
4
18]
Outdoor unit
lower than
indoor unit
Example: H2,
H4≤Limit
10 m
"To install riser piping" [
4
18]
Maximum height difference
between blower coil and
showcase
▪ Example: H3≤Limit
5 m
Requirement Limit
LRYEN10* LRYEN10* +
LRNUN5*
Maximum height difference
between air conditioners
▪ Example: H1≤Limit
0.5 m
(a)
Whichever is longer
To install an oil trap
If the outdoor unit is installed higher than the indoor unit, install an oil
trap in the gas piping every 5 meter. Oil traps will make the oil return
more easily.
a
c
b
a Showcase
b Height difference=5 m
c Trap
The refrigerant suction piping must always run down:
a
b
a
b
a Outdoor unit or indoor unit
b Flow direction in refrigerant suction piping
To install riser piping
If the outdoor unit is installed lower than the indoor unit, install the
riser piping close to the indoor unit. When the compressor of the
outdoor unit starts, a correct installed riser piping will prevent liquid
from flowing back to the outdoor unit.
a
b
a Outdoor unit
b Indoor unit
c Riser piping up to indoor unit.
13.1.4 To select the piping size
Determine the proper size using the following tables and reference
figure (only for indication).