9
English
[ PRECAUTIONS ]
1.
Do not overlap insulation for fitting.
(Refer to Fig. 11)
2.
Tape the liquid and gas pipe together from the bend up to where they enter the unit.
(Refer to Fig. 12)
3.
Wrap the drain hose inside the unit with insulation tape, but sepa-
rate it from the refrigerant pipe. If wrapped together, both pipes may
not fit inside the unit. (only when running pipes from the left side)
4.
When running pipes from the left side, keep pipes and the drain
hose as shown on Fig. 13.
5.
Do not bend the liquid pipe within 200 mm of the flare nut, to prevent
from damaging the pipe.
6.
Make sure the relay connector for the fan motor does not become
disengaged during piping work.
7.
When doing this, block any gaps between the side panel and the
pipes using putty to prevent dust from entering the indoor unit.
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: JIS Z 3264/B-Cu93P-710/795: ISO 3677) which does not require flux.”
(Flux has extremely harmful influence 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 you 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
or a flanged connection.
•
Nitrogen should be set to 0.02 MPa with a pressure-reducing valve if brazing while inserting nitrogen into
the piping.
(Refer to Fig. 14)
6. DRAIN PIPING WORK
1. Connect drain piping.
•
Be sure to secure reliable drainage for the drain piping.
•
Make sure the pipes are short and lead down, to prevent the formation of air pockets.
CAUTION
Water accumulating in the drain piping can cause the drain to clog.
Liquid pipe
Gas pipe
Drain hose
Fig. 13
Refrigerant piping
Part to be
brazed
Taping
Pressure-reducing valve
hands valve
Nitrogen
Nitrogen
Fig. 14
01_EN_3P184443-2.fm Page 9 Monday, July 3, 2006 3:14 PM
