Daikin VRV III Manual page 410

ED34-862
After the work is finished, make sure to check that there is no gas leak.
• Make absolutely sure to execute heat insulation works on the pipe-connecting section after checking gas
leakage by thoroughly studying the following figure.
• Wrap the insulation for fitting (3) (4) around the insulation for the joints on the liquid piping side and the gas
piping side. (Refer to Fig. 9, 10)
• When installing the unit onto the ceiling, make sure that the seam between the insulation for fitting (3) (4)
faces up. (Fasten both ends with the clamps (2).) (Fig.9, 10 shows the case of installation on the wall.)
• Wrap the included sealing pad (5) (6) around the insulation for fitting (3) (4). (Refer to Fig. 8)
CAUTION
Be sure to insulate any field piping all the way to the piping connection inside the unit. Any exposed piping
may cause condensation or burns if touched.
Piping connection
Fig. 8
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 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.
FXUQ-MA
Liquid piping
Cut any extra line off
after tightening it.
Flare nut
Piping union
Insulation
for fitting
Sealing pad (5) (6)
(accessory)
2
) with a pressure-reducing valve if brazing while inserting
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
Pressure-
reducing
valve
Taping
hands valve
Nitrogen
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Installation
Insulation for
fitting (4)
(accessory)
Clamp (2)
(accessory)
Gas piping
Fig. 10
Fig. 11
12
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