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English
•
After leakage check of piping connection is finished, carry out thermal insulation with the supplementary
piping insulation tubing and insulating tape (3). The insulating tape (3) should be wrapped from the L-
shaped bend all the way to the end inside the unit.
(Refer to Fig. 16)
•
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 completed, connect
the indoor unit with flares.
NOTE
1.
For the nitrogen exchange procedures, please refer to the Multi-split Type Series for Building installation
manual (contact your Daikin dealer).
2.
When brazing after having nitrogen flow through the pipe and substituting nitrogen for air, it is appropriate
to set the nitrogen pressure to about 0.02MPa with a pressure reducing valve.
(Refer to Fig. 17)
3.
Do not use flux when brazing refrigerant piping. Use the phosphor copper brazing filler metal (BCuP-2: JIS
Z 3264/B-Cu93P-710/795: ISO 3677) that does not require flux.
(Chlorine based flux is extremely harmful to refrigerant piping systems. It will corrode the refrigerant piping
and if it contains fluorine it will deteriorate the refrigerating oil.)
4.
When performing the leakage test for the indoor unit and inter-unit piping after the indoor unit is installed,
be sure to refer to the installation manual for the indoor unit or technical guide for the leakage test pressure
and the refrigerant piping installation.
5.
Shortage of refrigerant due to air purge or forgetting the additional refrigerant charge may cause malfunc-
tion of the unit (does not sufficiently cool or heat).
For installation of refrigerant piping, be sure to refer to the installation manual for the outdoor unit or the
technical guide.
CAUTION
•
Do not use oxidation inhibitors or the like when brazing. (Residues may cause clogging of pipes or damage
to parts.)
Insulating tubing tape
Insulating tubing tape
Local piping
Indoor unit piping
Indoor unit piping insulation tubing
Insulating tape (accessory) (3)
L-shaped
bend
Start wrapping
Refer to “ 5.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. 16
Clamp large (accessory) (4)
Refrigerant piping
Part to be
brazed
Taping
Pressure-reducing valve
hands valve
Nitrogen
Fig. 17
Nitrogen
4PEN468968-1C.book Page 12 Friday, March 24, 2017 1:30 PM