Refrigerant Piping Insulation; Connecting The Refrigerant Piping; To Connect The Refrigerant Piping To The Indoor Unit; Electrical Installation - Daikin FXSN71A2VEB Installation And Operation Manual

13 Electrical installation

(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.
12.1.2

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
9.5 mm (3/8") 10~14 mm
12.7 mm (1/2") 14~16 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.
12.2

Connecting the refrigerant piping

DANGER: RISK OF BURNING/SCALDING
12.2.1 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.
▪ Pipe length. Keep refrigerant piping as short as possible.
WARNING
▪ Use K65 piping for high-pressure applications with a
working pressure of 120 bar or 90 bar, depending on its
location in the system.
▪ Use K65 unions and fittings approved for a working
pressure of 120 bar or 90 bar, depending on its location
in the system.
▪ ONLY brazing is allowed for connection of pipes. No
other types of connections are allowed.
▪ Expanding of pipes is NOT allowed.
1 Insert the field pipe into the piping on the indoor unit side.
2 Connect refrigerant piping to the unit using only brazed
connections.
NOTICE
When brazing, place a wet cloth on the insulation attached
on the unit (a) and make sure the temperature does not
exceed 200°C.
Installation and operation manual
18
Insulation thickness
) (t)
i
≥10 mm
≥10 mm
a b
a Insulation attached on the unit
b Piping on the indoor unit side
c Brazed connection
d Field piping
3 Insulate the refrigerant piping on the indoor unit as follows:
A
a b c
1
A B
A Liquid piping
B Gas piping
a Insulation material (field supply)
b Tie wraps (accessory)
c Insulation pieces: Large (gas pipe), small (liquid pipe)
(accessory)
d Brazed connection
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 brazed connection.
NOTICE
Make sure to insulate all refrigerant piping. Any exposed
piping might cause condensation.
13 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.
c d
B
d b e f a b c d b
3 2 3
1
g g
4 4
FXSN50~112A2VEB
CO₂ Conveni-Pack: indoor unit
4P602815-1F – 2021.07
e f
2