Drain Piping Work - Daikin FXKQ25MVE Installation Manual

CAUTION
CAUTION TO BE TAKEN WHEN BRAZING REFRIGER-
ANT PIPING
Do not use flux when brazing refrigerant piping. Therefore, use
the phosphor copper brazing filler metal (BCuP-2: JIS Z 3264/
B-Cu93P-710/795: ISO 3677) which does not require flux.
(Flux has extremely harmful influence on refrigerant piping
systems. For instance, if the chlorine based flux is used, it will
cause pipe corrosion or, in particular, if the flux contains fluo-
rine, it will damage the refrigerant oil.)
• Before brazing local refrigerant piping, nitrogen gas shall be
blown through the piping to expel air from the piping.
If your brazing is done without nitrogen gas blowing, a large
amount of oxide film develops inside the piping, and could
cause system malfunction.
• When brazing the refrigerant piping, only begin brazing after
having carried out nitrogen substitution or while inserting
nitrogen into the refrigerant piping. Once this is done, con-
nect the indoor unit with a flared or a flanged connection.
• Nitrogen should be set to 0.02 MPa with a pressure-reducing
valve if brazing while inserting nitrogen into the piping.
Refrigerant
piping
Part to be
brazed
Nitrogen
NOTE
The flare nuts used must be those included with the
main body.
• Refer to Table 3 for tightening torque.
Table 3
Pipe Tightening torque dimen-
size (N·m)
A (mm)
6.4
15.7 ± 1.5 8.9 ± 0.2
(1/4")
9.5
36.3 ± 3.6 13.0 ± 0.2
(3/8")
12.7
54.9 ± 5.4 16.4 ± 0.2
(1/2")
15.9
68.6 ± 6.8 19.5 ± 0.2
(5/8")
Not recommendable but in case of emergency
You must use a torque wrench but if you are obliged to install the
unit without a torque wrench, you may follow the installation
method mentioned below.
After the work is finished, make sure to check that there is
no gas leak.
When you keep on tightening the flare nut with a spanner, there
is a point where the tightening torque suddenly increases. From
that position, further tighten the flare nut the angle shown below:
Table 4
Further tightening
Pipe size
angle
6.4 (1/4")
60 to 90 degrees
9.5 (3/8")
60 to 90 degrees
12.7 (1/2")
30 to 60 degrees
15.9 (5/8")
30 to 60 degrees
6
Pressure-
reducing
valve
Taping
hands valve
Nitrogen
Flare
Flare
sions
R0.4-0.8
Recommended arm length
of tool
Approx. 150mm
Approx. 200mm
Approx. 250mm
Approx. 300mm
7.

DRAIN PIPING WORK

<<Rig the drain pipe as shown below and take measures
against condensation. Improperly rigged piping could lead
to leaks and eventually wet furniture and belongings.>>
(1) Carry out the drain piping
• Keep piping as short as possible and slope it downwards
so that air may not remain trapped inside the pipe.
• The diameter of the drain pipe should be greater than or
equal to the diameter of the connecting pipe (vinyl tube;
pipe size: 25 mm; outer dimension: 32 mm).
• Use the drain hose and metal clamp. Insert the drain
hose into the drain socket, up to the white tape.
Tighten the metal clamp until the screw head is less than
4 mm from the hose.
Tape
Metal clamp
(accessory)
CAUTION
Setting the unit at an angle opposite to the drain piping
might cause leaks.
• Wrap the sealing pad over the clamp and drain hose to
insulate.
• Insulate the drain hose inside the building.
While referring to the figure on the right, insulate the
clamp and drain hose with the large sealing pad.
• If the drain hose cannot be sufficiently set on a slope, exe-
cute the drain raising piping.
• Secure a downward gradient of 1/100 or more for the
drain pipe. To accomplish this, mount supporting brackets
at an interval of 1 - 1.5 m.
<Precautions when doing drain-up piping work.>
• Make sure the drain-up piping is at most 330 mm high.
• Stand the drain-up piping horizontally, and make sure it is
not further than 300 mm from the base of the drain
socket.
Ceiling slab
300
Drain-up piping
Metal clamp
Drain hose (accessory)
(accessory)
• Use the following outline if laying concentrated drain piping.
Metal clamp
Drain hose
Large sealing pad
(accessory)
≤4mm
Support bracket
1-1.5 m
Adjustable
( 330)
Riser
(length: mm)
English