Daikin FXAQ09MVJU Installation Manual download pdf (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)

• 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)

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.

Refrigerant piping

Part to be

brazed

Taping

Pressure-reducing valve

hands valve

Nitrogen Fig. 14

Nitrogen

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

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Daikin FXAQ09MVJU Installation Manual Page 13

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