14 Piping installation
Installation and operation manual
24
RXYSA4~6A7V/Y1B
VRV 5-S system air conditioner
4P600329-1E – 2023.02
NOTICE
If the unit CANNOT be installed fully level, always make
sure that the inclination is towards the backside of the unit.
This is required to guarantee proper drainage.
NOTICE
If drain holes of the outdoor unit are covered by a mounting
base or by floor surface, raise the unit to provide a free
space of more than 150 mm under the outdoor unit.
≥150 mm
Drain holes (dimensions in mm)
A
171
171
758
43
48
288
451
613
776
408
414
349
214
111
(480~490)
107
B
B
C
D
=
E
A
Discharge side
B
Distance between anchor points
C
Bottom frame
D
Drain holes
E
Knockout hole for snow
Snow
In regions with snowfall, snow might build up and freeze between the
heat exchanger and the casing of the unit. This might decrease the
operating efficiency.
INFORMATION
It is recommended to install the optional bottom plate
heater (EKBPH250D7) when the unit is installed in cold
climates.
13.3.4
To prevent the outdoor unit from falling
over
In case the unit is installed in places where strong wind can tilt the
unit, take following measure:
1
Prepare 2 cables as indicated in the following illustration (field
supply).
2
Place the 2 cables over the outdoor unit.
3
Insert a rubber sheet between the cables and the outdoor unit
to prevent the cables from scratching the paint (field supply).
4
Attach the ends of the cables.
5
Tighten the cables.
14
Piping installation
14.1
Preparing refrigerant piping
14.1.1
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.
▪ Foreign materials inside pipes (including oils for fabrication) must
be ≤30 mg/10 m.
14.1.2
Refrigerant piping material
▪
Piping material:
phosphoric acid deoxidised seamless copper
▪
Flare connections:
Only use annealed material.
▪
Piping temper grade and thickness:
Outer diameter
(Ø)
Temper grade
Thickness (t)
(a)
6.4 mm (1/4")
9.5 mm (3/8")
12.7 mm (1/2")
Annealed (O)
≥0.80 mm
t
Ø
15.9 mm (5/8")
Annealed (O)
≥0.99 mm
19.1 mm (3/4")
Half hard (1/2H)
≥0.80 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.
14.1.3
To select the piping size
Determine the proper size using the following tables and reference
figure (only for indication).
A
B-1
B-2
C-1
C-2
C-3
C-4
1
3-1
3-2
3-3
3-4
VRV DX
2
2
2
1
Outdoor unit
2
Refrigerant branch kits
3-1~3-4
VRV DX indoor units
