Daikin FXSA15A2VEB, Installation And Operation Manual

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13 Piping installation
Installation and operation manual
16
FXSA15~140A2VEB
VRV system air conditioner
3P599602-1 – 2020.05
13 Piping installation
13.1 Preparing refrigerant piping
13.1.1 Refrigerant piping requirements
CAUTION
Piping MUST be installed according to instructions given in
"13 Piping installation" [
4
16]. Only mechanical joints (e.g.
braze+flare connections) that are compliant with the latest
version of ISO14903 can be used.
NOTICE
The piping and other pressure-containing parts shall be
suitable for refrigerant. Use phosphoric acid deoxidised
seamless copper for refrigerant.
▪ 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 Pipe outer diameter (mm)
Liquid piping Gas piping
15~32 Ø6.4 mm Ø9.5 mm
40~80 Ø6.4 mm Ø12.7 mm
100~140 Ø9.5 mm Ø15.9 mm
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") Annealed (O) ≥0.8 mm
t
Ø
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
(Ø
p
)
Insulation inner
diameter (Ø
i
)
Insulation thickness
(t)
6.4 mm (1/4") 8~10 mm ≥10 mm
9.5 mm (3/8") 10~14 mm ≥13 mm
12.7 mm (1/2") 14~16 mm ≥13 mm
15.9 mm (5/8") 16~20 mm ≥13 mm
Ø
i
Ø
i
t
Ø
p
Ø
p
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:
B A
a d c e f b b a d c e f b b
2
4
3
g
1
2 3
4
g
1
A B
A Gas piping
B Liquid piping
a Insulation material (field supply)
b Tie wrap (accessory)
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.