Drain Piping Work - Daikin FXMQ20PAVE Manual De Instalación

(3) Refer to the illustration on the right-hand side and be sure to
perform heat insulation work on the piping joints after gas
leakage checks. (Refer to Fig. 6)
Heat insulation procedure for liquid piping
Insulation for fitting (4) (accessory)
Insulation material
Flare nut joint
for piping
(on unit side)
Make sure that
the seam faces
Attached to
upward.
the surface.
Main unit
Clamp (8)
(accessory)
Insulation material
for piping (field supply)
Gas pipe
Heat insulation procedure for gas piping
Insulation for fitting (5) (accessory)
Insulation material
Flare nut joint
for piping
(on unit side)
Make sure that
the seam faces
Attached to
upward.
the surface.
Clamp (8)
(accessory)
Insulation material
for piping (field supply)
• Use the insulation for fitting (4) and (5) provided to the
liquid piping and gas piping, respectively, and conduct
heat insulation work.
(Tighten both edges of the insulation for fitting (4) and (5)
for each joint with the clamp (8).)
• Make sure that the joint of the insulation for fitting (4) and
(5) for the joint on the liquid piping and gas piping side
faces upward.
• Wrap the middle sealing material (7) around the
insulation for fitting (4) and (5) for the joint (flare nut
part).
CAUTION
• Be sure to perform the heat insulation of the local piping
up to the piping joint.
If the piping is exposed, dew condensation may result.
Furthermore, a burn may be caused if a human body comes
in contact with the piping.
English
Middle sealing pad (7)
(accessory)
Wrap the insulation material
around the portion from the
surface of the main unit to the
upper part of the flare nut joint.
Liquid pipe
Fig. 6
Middle sealing pad (7)
(accessory)
Wrap the insulation material
around the portion from the
surface of the main unit to the
upper part of the flare nut joint.
• Perform nitrogen substituent or apply nitrogen into the
refrigerant piping (see NOTE 1) in the case of refrigerant
piping blazing (see NOTE 2). Then perform the flare
connection of the indoor unit. (Refer to Fig. 7)
Refrigerant
piping
Part to be
brazed
Nitrogen
Fig. 7
CAUTION
• Do not use any antioxidant at the time of piping blazing.
The piping may be clogged with a residual antioxidant and
parts may malfunction.
NOTE
1. At the time of blazing, set the pressure of nitrogen to
approximately 0.02 MPa (close to the pressure of a
breeze coming in contact with the cheek) with a
decompression valve.
2. Do not use flux at the time of blazing and connecting the
refrigerant piping. Use a copper phosphorus brazing alloy
(BCuP-2: JIS Z 3264/BCu 93P-710/795: ISO3677), which
does not require flux, for blazing.
(Flux has a bad influence on the refrigerant piping. Chlo-
rine-based flux will cause piping corrosion. Furthermore, if
it contains fluorine, the flux will deteriorate refrigerant oil.)
• As for the branching of the refrigerant piping or refrigerant,
refer to the installation manual provided with the outdoor unit.

7. DRAIN PIPING WORK

(1) Conduct drain piping work.
Check that the piping
ensures proper draining.
• Make sure that the
diameter of the piping
excluding the rising part
is the same as or larger
than the diameter of the connecting
pipe (vinyl chloride pipe with an outer diameter of
32 mm and a nominal inner diameter of 25 mm).
• Make sure that the piping is short enough with a down-
ward slope of at least 1/100 and that there is no air
bank formed. No drain trap is required.
CAUTION
• The drain piping will be clogged with water and water
leakage may result if the water is accumulated in the drain
piping.
• Conduct drain-up piping work if the gradient is
insufficient.
• Attach a support bracket at 1 to 1.5 m intervals for the
prevention of piping deflection.
1 - 1.5 m
Downward slope of at least 1/100
Pressurereducing valve
Taping
hands
valve
Nitrogen
Refrigerant
piping
Drain socket
Socket for
maintenance
(with rubber cap)
Support bracket
7