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17
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Piping installation
Installer and user reference guide
54
FXMQ-A
VRV system air conditioner
4P701548-1 – 2022.07
▪
Do NOT use flux when brazing copper-to-copper refrigerant piping. Use phosphor
copper brazing filler alloy (BCuP-2: JIS Z 3264/, BCu 93P-710/795: ISO3677),
which does not require flux.
Flux has an extremely harmful influence on refrigerant piping systems. E.g., if a
chlorine-based flux is used, it will cause pipe corrosion or, in particular, if the flux
contains fluorine, it will deteriorate the refrigerant oil.
17.2.5 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.
1
Connect the
liquid piping
to the unit using the flare connections.
b
c
a
d
a
Field piping
b
Flare nut (attached to the unit)
c
Refrigerant pipe connection (attached to the unit)
d
Indoor unit
2
Connect the
gas piping
using the attached piping (accessory). Fix it to the unit
using hexagon head bolts (M10×40) (accessory) and spring washers
(accessory). Place sealing (on the attached piping) between the connection.
b
d
a
f
c
e
a
Field piping
b
Hexagon head bolt (M10×40)
c
Spring washer (accessory)
d
Attached piping
e
Sealing (on the attached piping)
f
Indoor unit
CAUTION
Do NOT reuse sealing (on the attached piping). Always use new sealing to prevent
refrigerant gas leaks.
3
Insulate the refrigerant piping on the indoor unit as follows:
A
B
B
b
a
f
e
a a d
c
A
b
b a
a
a e f
A
Liquid piping
B
Gas piping
a
Insulation material (field supply)
b
Cable tie (field supply)
c
Attached piping (accessory)
d
Hexagon head bolt and spring washer (accessory)
e
Refrigerant pipe connection (attached to the unit)