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7
English
Joint insulating
material (9)
(accessory)
Piping holding plate screw
(2 points)
Gas piping
Liquid piping
Liquid side piping insulating method
Indoor unit
Indoor unit
Clamp (4)
(accessory)
Sealing material
(11) Medium-1
(accessory)
Sealing material
(12) Medium-2
(accessory)
Clamp (4)
(accessory)
Piping
insulating
material
(field supply)
Gas side piping insulating method
Joint insulating
material (8)
(accessory)
Piping insulating
material (main unit)
Bring the
seam
to the top.
Flare nut
connection
Piping
insulating
material
(field supply)
Do not leave
clearance.
Flare nut
connection
Bring the
seam
to the top.
Do not leave
clearance.
Piping insulating
material (main unit)
Wind around the
piping until top of the
flare nut connection,
beginning at the base.
Wind around the
piping, beginning
at the base.
Do not expose the
piping in order to
prevent the vapor
condensation.
Tighten the portion
where overlapped by
the piping insulating
material.
Tighten the portion
where overlapped by
the piping insulating
material.
Do not expose the
piping in order to
prevent the vapor
condensation.
Fig. 12
• Before brazing refrigerant piping, have nitrogen ow
through the refrigerant piping and substitute air with
nitrogen (NOTE 1) (Refer to Fig. 13). Then, carry out
brazing (NOTE 2).
After all the brazing works are nished, carry out are
connection with the indoor unit. (Refer to Fig. 12)
Pressure reducing valve
Nitrogen
Taping
Stop valve
Brazing place
Nitrogen
Refrigerant piping
Fig. 13
NOTE
1. The proper pressure for having nitrogen ow through the
piping is approximately 2.9 psi (0.02 MPa), (close to the
pressure of breeze coming in contact with the cheek) with
a pressure-reducing valve.
2. Do not use ux when brazing refrigerant piping.
Use phosphor copper brazing ller metal (BCuP-2/B-
Cu93P-710/795) that does not require ux.
(If chlorinated ux is used, the piping will be corroded
and, in addition if uorine is contained, the refrig erant
oil will be deteriorated and the refrigerant circuit will be
affected badly.)
3. When carrying out leakage test of refrigerant piping
and the indoor unit after the installation of indoor unit is
nished, conrm the connecting outdoor unit installation
manual for test pressure.
Refer to the outdoor unit installation manual or technical
document for refrigerant piping.
4. In case of refrigerant shortage due to forgetting addi-
tional refrigerant charge etc., it will result in malfunctions
such as not cooling or heating.
Refer to the outdoor unit installation manual or technical
document for refrigerant piping.
CAUTION
Do not use antioxidant when brazing piping.
It may result in malfunction of components and clogging of
piping due to residue.
7. DRAIN PIPING WORK
(1) Carry out drain piping.
Check that the piping ensures proper draining.
• Select the piping diameter equal to or larger than (ex-
cept for riser) that of the connection piping (PVC pipe
piping, nominal diameter 1 in. (25mm), outside diam-
eter 1-1/4 in. (32mm)).
• Install the drain piping as short as possible with
downward inclination of 1/100 or more where air can-
not stagnate. (RefertoFig.14) Bubbling sound may
occur.
01_EN_3P161684-9U.indd 7 8/8/2018 15:26:52
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