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NOTICE
▪ Prepare a water drainage channel around the
foundation to drain waste water from around the unit.
During heating operation and when the outdoor
temperatures are negative, the drained water from the
outdoor unit will freeze up. If the water drainage is not
taken care of, the area around the unit might be very
slippery.
▪ When installed in a corrosive environment, use a nut
with plastic washer (a) to protect the nut tightening part
from rust.
a
14.3.2
To install the outdoor unit
1 Transport the unit by crane or forklift and put it onto the
installation structure.
2 Fix the unit to the installation structure.
3 If transported by crane, remove the slings.
15
Piping installation
CAUTION
See
"2 Specific installer safety
sure this installation complies with all safety regulations.
15.1
Preparing refrigerant piping
15.1.1
Refrigerant piping requirements
NOTICE
The piping and other pressure-containing parts shall be
suitable for refrigerant. Use phosphoric acid deoxidised
seamless copper for refrigerant piping.
INFORMATION
The RXYA/RMYA unit will limit pressure on the field piping
to 37.3 bar. Inside the outdoor unit, design pressure is
40 bar.
▪ Foreign materials inside pipes (including oils for fabrication) must
be ≤30 mg/10 m.
15.1.2
Refrigerant piping material
▪ Piping material: phosphoric acid deoxidised seamless copper
▪ Flare connections: Only use annealed material.
▪ Piping temper grade and thickness:
Outer diameter
Temper grade
(Ø)
6.4 mm (1/4")
Annealed (O)
9.5 mm (3/8")
12.7 mm (1/2")
15.9 mm (5/8")
Annealed (O)
19.1 mm (3/4")
Half hard (1/2H)
22.2 mm (7/8")
28.6 mm (1 1/8")
Half hard (1/2H)
RYMA5+RXYA8~20A7Y1B
VRV 5 heat pump
4P739915-1 – 2023.12
instructions" [ 4 4] to make
(a)
Thickness (t)
Ø
≥0.80 mm
t
≥0.99 mm
≥0.80 mm
≥0.99 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.
15.1.3
To select the piping size
Determine the proper size using the following tables and reference
figure (only for indication).
B
e
A
c
C'
b
1
C'''
C''
d
d
D
D
D
D
D
a
a
a
a
a
10
11
1
2
3
a1~a11
VRV DX indoor units
b1~b3
SV units
c
First indoor branch kit (header)
d
Indoor branch kit (refnet)
e
Outdoor multi connection kit
A~D
Piping
A, B: Piping between outdoor unit and (first)
refrigerant branch kit
Choose from the following table in accordance with the outdoor unit
total capacity type. Pipe A is in case of multi-connection the sum of
the outdoor units connected upstream. In case there is no first indoor
branch kit (c), pipe A is connected to the first SV unit or VRV DX
indoor unit.
HP class
Piping outer diameter [mm]
Gas pipe
5~10
12~14
16~20
C: Piping between refrigerant branch kit and SV
units OR between two refrigerant branch kits OR
between two SV units
Choose from the following table in accordance with the indoor unit
total capacity type, connected downstream. Do not let the
connection piping exceed the refrigerant piping size chosen by the
general system model name.
Example
▪ Downstream capacity for C' = [capacity index of unit a1] + [unit a2]
+ [unit a3] + [unit a4] + [unit a5] + [unit a6] + [unit a7]
▪ Downstream capacity for C'' = [capacity index of unit a3] +
[unit a4]
▪ Downstream capacity for C''' = [capacity index of unit a10] +
[unit a11]
Indoor unit capacity
Piping outer diameter [mm]
index
Gas pipe
<150
150≤x<290
15 Piping installation
B
C
C
b
b
2
3
C
d
D
D
D
D
D
a
a
a
a
a
4
5
6
7
8
Liquid pipe
19.1
9.5
22.2
12.7
28.6
Liquid pipe
15.9
9.5
19.1
Installation and operation manual
D
a
9
29
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