7
3P086154-3R
English
CAUTION
•
CAUTION TO BE TAKEN WHEN BRAZING REFRIGER-
ANT PIPING
Do not use flux when brazing refrigerant piping. Therefore,
use the phosphor copper brazing filter metal (BCuP) which
does not require flux.
(Flux has an extremely negative effect on refrigerant pip
-
ing systems. For instance, if chlorine based flux is used, it
will cause pipe corrosion. If the flux contains fluorine, it will
damage the refrigerant oil.)
DANGER
•
Use of oxygen may cause an explosion resulting in serious
injury or death. Only use nitrogen gas.
•
Refrigerant gas may produce toxic gas if it comes in contact
with fire such as from a fan heater, stove or cooking device.
Exposure to this gas could cause severe injury or death.
•
Before brazing local refrigerant piping, nitrogen gas shall
be blown through the piping to expel air from the piping.
If 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 insert-
ing nitrogen into the refrigerant piping. Once this is done,
connect the indoor unit with a flared or a flanged connec
-
tion.
•
Nitrogen should be set to 2.9 psi (0.02 MPa) with a pres-
sure-reducing valve if brazing while inserting nitrogen into
the piping.
Refrigerant
piping
Part to be
brazed
Taping
Pressure-
reducing
valve
Hands valve
Nitrogen
Nitrogen
NOTE
Use the flare nuts attached with the unit.
•
Refer to Table 2 for tightening torque.
Table 2
Piping
size
[in. (mm)]
Tightening
torque
[lbf·ft. (N·m)]
Dimension for
processing flare
A [in. (mm)]
Flare shape
f
1/4
(6.4)
10.4 – 12.7
(15.7±1.5)
0.342 – 0.358
(8.9±0.2)
R0.016-0.031
90°±2°
A
45°±2°
f
3/8
(9.5)
24.1 – 29.4
(36.3±3.6)
0.504 – 0.520
(13.0±0.2)
f
1/2
(12.7)
36.5 – 44.5
(54.9±5.4)
0.638 – 0.654
(16.4±0.2)
f
5/8
(15.9)
45.6 – 55.6
(68.6±6.8)
0.760 – 0.776
(19.5±0.2)
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 at
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 span
-
ner, there is a point where the tightening torque suddenly
increases. From that position, further tighten the flare nut at
the angle shown below:
Table 3
Piping size
[in. (mm)]
Tightening
angle
Recommended arm length of
tool used [in. (mm)]
f
1/4 (6.4)
60° – 90°
Approx. 6 (150)
f
3/8 (9.5)
60° – 90°
Approx. 8 (200)
f
1/2 (12.7)
30° – 60°
Approx. 10 (250)
f
5/8 (15.9)
30° – 60°
Approx. 12 (300)
7. DRAIN PIPING WORK
Install the drain pipe as shown below. Improperly installed
piping could lead to leaks and eventually wet furniture
and belongings.
(1)
Carry out the drain piping.
3/4 drain pipe
2 (50) or more
Drip pan
Metal clamp
(accessory) (2)
Drain hose
(accessory) (1)
Cut to suitable length
[length : in. (mm)]
Connect the drain
hose (1) using the
attached hose and
parts, as shown in
the right drawing.
Piping process
inside unit
Tilt
•
If converging multiple drain pipes, install according to the
procedure shown below.
Slope downwards at a gradient
of at least 1/100
Select converging drain pipes whose gauge is suitable for the
operating capacity of the unit.
(2)
After piping work is finished, check drainage flows
smoothly.
•
Add approximately 1/4 gal (1L) of water slowly from the
air outlet and check drainage flow.
(3)
Be sure to insulate all indoor pipes.
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