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 flow
through the refrigerant piping and substitute air with nitro-
gen (NOTE 1)
(Refer to Fig. 13). Then, carry out brazing
(NOTE 2).
After all the brazing works are finished, carry out flare
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 flow through the
piping is approximately 0.02 MPa, a pressure that makes
one feel like breeze and can be obtained through a pres-
sure reducing valve.
2.
Do not use flux when brazing refrigerant piping.
Use phosphor copper brazing filler metal (BCuP-2: JIS Z
3264/B-Cu93P-710/795: ISO 3677) that does not require
flux.
(If chlorinated flux is used, the piping will be corroded and,
in addition if fluorine 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 fin
-
ished, confirm 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 can 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 1/100 or more and without where air
may stagnate.
(Refer to Fig. 14) (It may cause abnormal
sound such as bubbling noise.)
3P335596-2D English
8
