Drain Piping Work - Daikin FXLQ-M Series Engineering Data

Appendix
CAUTION
CAUTION TO BE TAKEN WHEN BRAZING REFRIGER-
ANT PIPING
damage the refrigerant oil.)
DANGER
injury or death. Only use nitrogen gas.
Before brazing local refrigerant piping, nitrogen gas shall
If brazing is done without nitrogen gas blowing, a large
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,
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
Nitrogen
NOTE
Refer to Table 2 for tightening torque.
Table 2
Piping Tightening
size torque
[in. (mm)] [lbf·ft. (N·m)]
1/4 10.4 – 12.7
(6.4) (15.7±1.5)
3/8 24.1 – 29.4
(9.5)
(36.3±3.6)
1/2 36.5 – 44.5
(12.7)
(54.9±5.4)
5/8 45.6 – 55.6
(15.9)
(68.6±6.8)
7
7
Pressure-
reducing
valve
Taping
Part to be
Hands valve
brazed
Nitrogen
Dimension for
Flare shape
A [in. (mm)]
0.342 – 0.358
(8.9±0.2)
0.504 – 0.520
(13.0±0.2)
R0.016-0.031
0.638 – 0.654
(16.4±0.2)
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.
there is no gas leak.
-
ner, there is a point where the tightening torque suddenly
the angle shown below:
Table 3
Piping size Tightening
[in. (mm)] angle
1/4 (6.4)
3/8 (9.5)
1/2 (12.7)
5/8 (15.9)

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.
-
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.
Select converging drain pipes whose gauge is suitable for the
operating capacity of the unit.
(2)
smoothly.
(3) Be sure to insulate all indoor pipes.
EDUS391502-F7
-
Recommended arm length of
tool used [in. (mm)]
Drip pan
Metal clamp
(accessory) (2)
Drain hose
(accessory) (1)
2 (50) or more
3/4 drain pipe
Cut to suitable length
[length : in. (mm)]
Slope downwards at a gradient
of at least 1/100
3P086154-3R English
FXLQ-M / FXNQ-M
3P086154-3R