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English
CAUTION
CAUTION TO BE TAKEN WHEN BRAZING REFRIGERANT PIPING
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“Do not use fl ux when brazing refrigerant piping. Therefore, use the phosphor copper brazing fi lter metal
(BCuP) which does not require fl ux.”
(Flux has an extremely negative effect on refrigerant piping systems. For instance, if chlorine based fl ux
is used, it will cause pipe corrosion. If the fl ux contains fl uorine, it will damage the refrigerant oil.)
When brazing the refrigerant piping, only begin brazing after having carried out nitrogen substitution
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(NOTE 1) or while inserting nitrogen into the refrigerant piping (NOTE 2). Once this is done, connect the
indoor unit with a fl ared or a fl anged connection.
DANGER
Use of oxygen may cause an explosion resulting in serious injury or death. Only use nitrogen gas.
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NOTE
Refer to the “Manual for Multi Installation for Buildings” for directions on how to carry out nitrogen
1.
substitution. (Inquire with your dealer.)
Nitrogen should be set to 2.9 psi with a pressure-reducing valve if brazing while inserting nitrogen into
2.
the piping.
(Refer to Fig. 14)
Refrigerant piping
Part to be
brazed
Taping
Pressure-reducing valve
hands valve
Nitrogen
Fig. 14
Nitrogen
After checking for gas leaks, be sure to insulate the pipe connections using the supplementary piping
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insulation tubing and insulating tape (4). The insulating tape (4) should be wrapped from the L-shaped
bend all the way to the end inside the unit.
(Refer to Fig. 15)
Insulating tubing tape
Insulating tubing tape
Local piping
Indoor unit piping
Indoor unit piping insulation tubing
Clamping material large
(accessory) (5)
Insulating tape (accessory) (4)
L-shaped
bend
Start wrapping
See “ 4.INDOOR UNIT
INSTALLATION ”
Indoor unit piping insulation tubing
Insulating tubing tape
Insulation tubing seam
Attach the insulation tubing
tape so that there are no gaps
in the insulation tubing seam.
Fig. 15
CAUTION
Be sure to insulate any fi eld piping all the way to the piping connection inside the unit. Any exposed piping
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may cause condensate or burns if touched.
3PN07521̲2A̲EN.indd 12
3PN07521̲2A̲EN.indd 12
2008/12/26 13:41:43
2008/12/26 13:41:43
