Daikin FXAQ07MVJU Installation Manual page 13

CAUTION
• CAUTION TO BE TAKEN WHEN BRAZING REFRIGERANT PIPING
"Do not use flux when brazing refrigerant piping. Therefore, use the phosphor copper brazing filter metal
(BCuP) which does not require flux."
(Flux has an extremely negative effect on refrigerant piping systems. For instance, if chlorine based flux is
used, it will cause pipe corrosion. If the flux contains fluorine, it will damage the refrigerant oil.)
• When brazing the refrigerant piping, only begin brazing after having carried out nitrogen substitution
(NOTE 1) or while inserting nitrogen into the refrigerant piping (NOTE 2). Once this is done, connect the
indoor unit with a flared or a flanged connection.
DANGER
• Use of oxygen may cause an explosion resulting in serious injury or death. Only use nitrogen gas.
NOTE
1. Refer to the "Manual for Multi Installation for Buildings" for directions on how to carry out nitrogen
substitution. (Inquire with your dealer.)
2. Nitrogen should be set to 2.9 psi with a pressure-reducing valve if brazing while inserting nitrogen into the
piping. (Refer to Fig. 14)
Refrigerant piping
• After checking for gas leaks, be sure to insulate the pipe connections using the supplementary piping
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
Local piping
Indoor unit piping insulation tubing
CAUTION
• Be sure to insulate any field piping all the way to the piping connection inside the unit. Any exposed piping
may cause condensate or burns if touched.
Part to be
brazed
Nitrogen
Insulating tape (accessory) (4)
Indoor unit piping
See " 4.INDOOR UNIT
INSTALLATION "
Taping
hands valve
Clamping material large
(accessory) (5)
Insulating tubing tape
L-shaped
bend
Start wrapping
Pressure-reducing valve
Nitrogen Fig. 14
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
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