Refrigerant Piping Length And Height Difference; To Select The Piping Size - Daikin LRYEN-AY1 Installation And Operation Manual

13 Piping installation
Piping type Outer
diameter
(Ø)
Liquid piping 15.9 mm
(5/8")
Gas piping 19.1 mm
(3/4")
(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
size" [ 4 18].
piping
Requirement
Maximum total piping length
Examples:
(a)
▪ A+B+C+D+(E or F) ≤Limit
(a)
▪ a+c+d+(e or f) ≤Limit
(a)
▪ A2+B2+(C2 or D2) ≤Limit
(a)
▪ a2+b2+(c2 or d2) ≤Limit
Piping length between
LRYEN10* and LRNUN5*
Maximum actual 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
unit
indoor unit
Example: H2,
H4≤Limit
Maximum height difference
between blower coil and
showcase
▪ Example: H3≤Limit
13.1.4

To select the piping size

Determine the proper size using the following tables and reference
figure (only for indication).
Installation and operation manual
18
Temper Thickness
(a)
grade (t)
Ø
R300 ≥1.05 mm
(drawn)
R300 ≥1.30 mm
(drawn)
"13.1.4 To select the
Limit
LRYEN10* LRYEN10* +
LRNUN5*
Refrigeration side: 130 m
Air conditioning side: 130 m
Not specified, but piping must be
horizontal
Refrigeration side: 50 m
Air conditioning side: 30 m
35 m
"To install an oil trap" [ 4 18]
10 m
piping" [ 4 18]
"To install riser
5 m
Requirement
Maximum height difference
t
between air conditioners
▪ Example: H1≤Limit
(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.
c
b
a Showcase
b Height difference=5 m
c Trap
The refrigerant suction piping must always run down:
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.
b
a
a Outdoor unit
b Indoor unit
c Riser piping up to indoor unit.
CO₂ Conveni-Pack outdoor unit and capacity up unit
Limit
LRYEN10* LRYEN10* +
LRNUN5*
0.5 m
a
a
b
a
b
LRYEN10A7Y1+LRNUN5A7Y1
4P605461-1B – 2020.08