Drain Piping Work - Daikin FXFQ25SVM Installation Manual

Gas side piping insulating method
Joint insulating
material (8)
(accessory)
Flare nut Piping insulating
connection material (main unit)
Bring the
Do not leave
seam
clearance.
to the top.
Indoor unit
Clamp (4)
Piping
(accessory)
insulating
Tighten the portion
material
where overlapped by
(field supply)
the piping insulating
material.
Do not expose the
piping in order to
prevent the vapor
condensation.
Liquid piping
Liquid side piping insulating method
Joint insulating
material (9)
(accessory)
Piping insulating
Flare nut
material (main unit)
connection
Bring the
Do not leave
seam
clearance.
to the top.
Indoor unit
Piping
insulating
material
Tighten the portion
(field supply)
where overlapped by
the piping insulating
Do not expose the
material.
piping in order to
prevent the vapor
condensation.
3P335596-2D English
Wind around the
piping until top of the
flare nut connection,
beginning at the base.
Sealing material
(11) Medium-1
(accessory)
Gas piping
Piping holding plate screw
(2 points)
Wind around the
piping, beginning
at the base.
Clamp (4)
Sealing material
(accessory)
(12) Medium-2
(accessory)
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)
Brazing place
Nitrogen
Refrigerant piping
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 e rant 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.)
Pressure reducing valve
Taping
Stop valve
Nitrogen
Fig. 13
8