8
• Before brazing refrigerant piping, have nitrogen
through the refrigerant piping and substitute air with nitro-
gen (NOTE 1) (Refer to Fig. 12). Then, carry out brazing
(NOTE 2).
After all the brazing works are
carry out
connection with the indoor unit. (Refer to Fig. 11)
Pressure reducing valve
Nitrogen
Taping
Stop valve
Brazing place
Nitrogen
Refrigerant piping
Fig. 12
NOTE
1. The proper pressure for having nitrogen through the
piping is approximately 0.02 MPa, a pressure that makes
one feel like slight breeze and can be obtained through a
pressure reducing valve.
2. Do not use
when brazing refrigerant piping.
Use phosphor copper brazing
metal (BCuP-2: JIS Z
3264/B-Cu93P-710/795: ISO 3677) that does not require
(If chlorinated is used, the piping will be corroded and,
in addition if
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
-
ished,
the connecting outdoor unit installation
manual for test pressure.
Refer to also the outdoor unit installation manual or techni-
cal document for refrigerant piping.
4. In case of refrigerant shortage due to forgetting additional
refrigerant charge etc., it will result in malfunc tion such as
does not cool or does not heat.
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.
Carry out drain piping so that drainage is ensured.
• Select the piping diameter equal to or larger than
(except for riser) that of the connection piping (polyvi-
nyl chloride piping, nominal diameter 25 mm, outside
diameter 32 mm).
• Install the drain piping as short as possible with down-
ward inclination of 1/10
0 or more and without such that
air may not stagnate. (Refer to Fig. 13) (It may cause
abnormal sound such as bubbling noise.)
• After leak test, referring to Fig. 11, insulate both the gas
and liquid piping connection with the attached joint in-
sulating material (4) and (5) to prevent the pipings from
getting exposed.
Then, tighten both the ends of insulating material with the
clamp (8).
• Wrap the sealing material (Me
dium) (7) around the joint
insulating material (4) and (5)
nut section), both the
gas and liquid piping.
• Make sure to bring the seam of joint insulating material (4)
and (5) to the top.
Joint insulating
material (4)
(accessory)
Gas piping
Liquid piping
Liquid side piping insulating method
Indoor unit
Indoor unit
Clamp (8)
(accessory)
Sealing material
(7) Medium
(accessory)
Clamp (8)
(accessory)
Piping
insulating
material
(field supply)
Gas side piping insulating method
Joint insulating
material (5)
(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)
Sealing material
(7) Medium
(accessory)
Wind around the
piping until top of the
flare nut connection,
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.
Wind around the
piping, beginning
at the base.
Fig. 11
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