Drain Piping Work - Daikin FCQ24TAVJU 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.
Gas piping
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
Clamp (4)
insulating
(accessory)
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.
Fig. 12
7
Wind around the
piping until top of the
flare nut connection,
beginning at the base.
Sealing material
(11) Medium-1
(accessory)
NOTE
Piping holding plate screw
(2 points)
Wind around the
piping, beginning
at the base.
Sealing material
(12) Medium-2
(accessory)

7. DRAIN PIPING WORK

(1) Carry out drain piping.
• Before brazing refrigerant piping, have nitrogen flow
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 finished, carry out flare
connection with the indoor unit. (Refer to Fig. 12)
Brazing place
Nitrogen
Refrigerant piping
Fig. 13
1. The proper pressure for having nitrogen flow 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 flux when brazing refrigerant piping.
Use phosphor copper brazing filler metal (BCuP-2/B-
Cu93P-710/795) 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
finished, confirm 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.
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. (25 mm), outside diam-
eter 1-1/4 in. (32 mm)).
• Install the drain piping as short as possible with
downward inclination of 1/100 or more where air can-
not stagnate. (Refer to Fig. 14) Bubbling sound may
occur.
Pressure reducing valve
Taping
Stop valve
Nitrogen
English