Daikin FXMQ-MF Engineering Data page 26

EDUS39-900-F10
CAUTION
Be sure to insulate any field pipe all the way to the pipe connection inside the unit. Any exposed pipe may cause
cndensate or burns if touched.
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/
B-Cu93P-710/795) which does not require flux.
(Flux has extremely harmful infulence on refrigerant piping systems. For instance, if the chlorine based flux is used, it will
cause pipe corrosion or, in particular, if the flux contains fluorine, it will damage the refrigerant 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 unit with a flared or a flanged connection.
 Nitrogen should be set to 2.90PSI with a pressure-reducing valve if brazing while inserting nitrogen into the piping.
FXMQ-MF
Refrigerant
piping
Part to be
brazed
Nitrogen
Fig. 11
Pressure-reducing valve
Taping
hands
valve
Nitrogen
Installation
25