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•
After the refrigerant piping and electrical wiring work is completed, hold the refrigerant piping, the
indoor unit drain hose, the wiring connecting the indoor and outdoor units and the earth wire with the
piping retainer plate
(Refer to Fig. 12)
. During this work the refrigerant piping entering into the indoor
unit may come in contact with the suction grille. Therefore, make sure not to extend the refrigerant
piping from the piping retainer plate.
(For electrical wiring work, see “8. ELECTRIC WIRING WORK”.)
•
After leakage check of piping connection is finished, carry out thermal insulation.
(Refer to Fig. 13)
•
Carry out thermal insulation of both liquid and gas pipes with the attached insulation for fitting (5) and
(6). (Tighten both ends of the insulation for fitting (5) and (6) with the clamp (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, and also electrical shock or fire if the
wiring is touched.
CAUTION
•
CAUTION TO BE TAKEN WHEN BRAZING REFRIGERANT PIPING
• Do not braze inside the unit.
Since the bottom plate and the fan housing are made of resin. They may melt or cause fire by spatter.
• Braze the refrigerant piping only after having nitrogen flow through the pipe and substituting nitrogen for air
(Refer to Fig. 17)
. Once this is completed, connect the indoor unit with flares
(Refer to Fig. 13)
.
1. 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)
2. 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.)
3. 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.
4. Shortage of refrigerant due to air purge or forgetting the additional refrigerant charge may cause
malfunction 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 anything oxidation inhibitor or the like when brazing. (Residues may cause clogging of pipes or
damage to parts.)
Nitrogen
Pressure-reducing
valve
Hands
valve
Taping
Refrigerant piping
Part to be
brazed
Nitrogen
Fig. 17
3PEN486970-1D.book Page 13 Monday, July 24, 2017 8:54 AM