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Piping connection
Sealing pad (5) (6)
Fig. 8
(accessory)
CAUTION
CAUTION TO BE TAKEN WHEN BRAZING REFRIGERANT PIPING
Do not use flux when brazing refrigerant piping. Therefore, use the phosphor copper brazing filler metal
(BCuP-2: JIS Z 3264/B-Cu93P-710/795: ISO 3677) which does not require flux.
(Flux has extremely harmful infulence on refrigerant piping sysems. For instance, if the chlorine based flux
is used, it will cause piping corrosion or, in particular, if the flux contains fluorine, it will damage the refrig-
erant oil.)
• Before brazing local refrigerant piping, nitrogen gas shall be blown through the piping to expel air from the piping.
If your brazing is done without nitrogen gas blowing, a large amount of oxide film develops inside the piping,
and could cause system malfunction.
• When brazing the refrigerant piping, only begin brazing after having carried out nitrogen substitution or
while inserting nitrogen into the refrigerant piping. Once this is done, connect the indoor unit with a flared
connection.
• Nitrogen should be set to 0.02 MPa (0.2 kg/cm
nitrogen into the piping.
CAUTION
Do not use anti-oxidants when brazing the piping joints. Residue can clog piping and break equipment.
English
Liquid piping
Cut any extra line off
after tightening it.
Flare nut
Piping union
Insulation
for fitting
Refrigerant
piping
Part to be
brazed
Nitrogen
Cut any extra line off
after tightening it.
Insulation for
fitting (3)
(accessory)
Flare nut
Piping union
Clamp (2)
(accessory)
Flare nut
Cut any extra line off
after tightening it.
Fig. 9
2
) with a pressure-reducing valve if brazing while inserting
Pressure-
reducing
valve
Taping
hands valve
Nitrogen
Insulation for
fitting (4)
(accessory)
Clamp (2)
(accessory)
Gas piping
Fig. 10
Fig. 11
9
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