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a
L
N
a
Power supply terminal block
b
User interface terminal block
2 Turn ON the power.
3 Start fan only operation (see the reference guide or the service
manual of the user interface).
4 Gradually pour approximately 1 l of water through the air
discharge outlet, and check for leaks.
b
a
a
Plastic water container with tube length ≥100 mm
b
Drain pump and float switch location
c
Service drain outlet (with rubber plug). Use this outlet to
drain water from the drain pan.
5 Turn OFF the power.
6 Disconnect the electrical wiring.
▪ Remove the service cover. See
electrical wiring to the indoor
▪ Disconnect the power supply.
▪ Disconnect the user interface.
▪ Reattach the service cover. See
electrical wiring to the indoor
When installation of the system is already completed
1 Start cooling operation (see the reference guide or the service
manual of the user interface).
2 Gradually pour approximately 1 l of water through the water
inlet, and check for leaks (see
completed" [ 4 14]).
is not yet
13
Piping installation
13.1
Preparing refrigerant piping
13.1.1
Refrigerant piping requirements
CAUTION
Piping MUST be installed according to instructions given in
installation" [ 4 15]. Only mechanical joints (e.g.
"13 Piping
braze+flare connections) that are compliant with the latest
version of ISO14903 can be used.
FXKQ-A
VRV system air conditioner
3P747532-1A – 2023.11
b
c
"14.2 To connect the
unit" [ 4 16].
"14.2 To connect the
unit" [ 4 16].
"When installation of the system
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.
Refrigerant piping diameter
For piping connections of the indoor unit use the following piping
diameters:
Class
Liquid piping
20~50
Ø6.4 mm
63
Ø9.5 mm
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")
(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")
12~15 mm
12.7 mm (1/2")
14~16 mm
15.9 mm (5/8")
17~20 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 Piping installation
Pipe outer diameter (mm)
Gas piping
Ø12.7 mm
Ø15.9 mm
(a)
Thickness (t)
Ø
≥0.8 mm
Insulation thickness
)
(t)
i
≥10 mm
≥13 mm
≥13 mm
≥13 mm
Installation and operation manual
t
15
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