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▪ 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")
(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.
13.1.2
Refrigerant piping insulation
▪ Use polyethylene foam as insulation material:
▪ with a heat transfer rate between 0.041 and 0.052 W/mK (0.035
and 0.045 kcal/mh°C)
▪ with a heat resistance of at least 120°C
▪ Insulation thickness
Pipe outer diameter
Insulation inner
(Ø
)
diameter (Ø
p
6.4 mm (1/4")
8~10 mm
9.5 mm (3/8")
10~14 mm
12.7 mm (1/2")
14~16 mm
15.9 mm (5/8")
16~20 mm
Ø
Ø
i
i
Ø
Ø
p
p
t
If the temperature is higher than 30°C and the humidity is higher
than RH 80%, the thickness of the insulation materials should be at
least 20 mm to prevent condensation on the surface of the
insulation.
13.2
Connecting the refrigerant piping
DANGER: RISK OF BURNING/SCALDING
13.2.1
To connect the refrigerant piping to the
indoor unit
CAUTION
Install the refrigerant piping or components in a position
where they are unlikely to be exposed to any substance
which may corrode components containing refrigerant,
unless the components are constructed of materials that
are inherently resistant to corrosion or are suitably
protected against corrosion.
WARNING: MILDLY FLAMMABLE MATERIAL
The refrigerant inside this unit is mildly flammable.
▪ Pipe length. Keep refrigerant piping as short as possible.
▪ Flare connections. Connect refrigerant piping to the unit using
flare connections.
▪ Insulation. Insulate the refrigerant piping on the indoor unit as
follows:
FXMA-A
VRV system air conditioner
3P680922-1A – 2022.01
(a)
Thickness (t)
Ø
≥0.8 mm
t
Insulation thickness
)
(t)
i
≥10 mm
≥13 mm
≥13 mm
≥13 mm
14 Electrical installation
A
a
b
c
1
A B
A
Liquid piping
B
Gas piping
a
Insulation material (field supply)
b
Tie wrap (field supply)
c
Insulation pieces: Large (gas pipe), small (liquid pipe)
(accessories)
d
Flare nut (attached to the unit)
e
Refrigerant pipe connection (attached to the unit)
f
Unit
g
Sealing pads: Medium 1 (gas pipe), medium 2 (liquid
pipe) (accessories)
1
Turn up the seams of the insulation pieces.
2
Attach to the base of the unit.
3
Tighten the tie wrap on the insulation pieces.
4
Wrap the sealing pad from the base of the unit to the top
of the flare nut.
NOTICE
Make sure to insulate all refrigerant piping. Any exposed
piping might cause condensation.
14
Electrical installation
DANGER: RISK OF ELECTROCUTION
WARNING
ALWAYS use multicore cable for power supply cables.
WARNING
Use an all-pole disconnection type breaker with at least
3 mm between the contact point gaps that provide full
disconnection under overvoltage category III.
WARNING
If the supply cord is damaged, it MUST be replaced by the
manufacturer, its service agent or similarly qualified
persons in order to avoid a hazard.
14.1
Specifications of standard wiring
components
Component
(a)
Power
MCA
supply cable
Voltage
Phase
Frequency
Wire sizes
Transmission wiring
For specification refer to the installation
User interface cable
B
d
b
e f
a
b
c
d
b
3
2
3
1
g
g
4
4
"
14‒1 Minimum circuit
ampacity" [ 4 20]
220~240 V/220 V
1~
50/60 Hz
2
1.5 mm
(3‑core wire)
H07RN-F (60245 IEC 66)
manual of the outdoor unit
2
0.75 to 1.25 mm
(2‑core wire)
H05RN-F (60245 IEC 57)
Length ≤500 m
Installation and operation manual
e f
2
19
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