Opening The Knockout Hole; Pipe Connection - Fujitsu AJYA36LALH Installation Manual

5. 3.

Opening the knockout hole

Be careful not to deform or scratch the panel while opening the knockout holes.
To protect the piping insulation after opening a knockout hole, remove any burrs
from the edge of the hole. It is recommended to apply rust prevention paint to the
edge of the hole.
• Pipes can be connected from 4 directions, front, lateral side, rear side and bottom.
(Fig. A)
• When connecting at the bottom, remove the service panel and piping cover on the
front of the outdoor unit, and open the knockout hole provided at the bottom corner of
the piping outlet.
• It can be installed as shown on "Fig. B" cutting out the 2 slits as indicated on "Fig. C".
(When cutting slits, use a steel saw.)
Fig. A
Service panel
Fig. B
Slit
Slit
Front Lateral
connection connection
En-7
CAUTION
Fig. C
Bottom
connection
Bottom Rear
connection
connection
5. 4.

Pipe connection

Do not use mineral oil on a fl ared part. Prevent mineral oil from getting into the system
as this would reduce the lifetime of the units.
While brazing the pipes, be sure to blow dry nitrogen gas through them.
The maximum lengths of this product are shown in the table. If the units are further
apart than this, correct operation cannot be guaranteed.
5. 4. 1. Flaring
• Use special pipe cutter and fl are tool exclusive for R410A.
(1) Cut the connection pipe to the necessary length with a pipe cutter.
(2) Hold the pipe downward so that the cuttings will not enter the pipe and remove any
burrs.
(3) Insert the fl are nut (always use the fl are nut attached to the indoor and outdoor
units respectively) onto the pipe and perform the fl are processing with a fl are tool.
Leakage of refrigerant may result if other fl are nuts are used.
(4) Protect the pipes by pinching them or with tape to prevent dust, dirt, or water from
entering the pipes.
Check if [L] is fl ared uniformly
and is not cracked or scratched.
L
Dimension A (mm)
Pipe outside
Flare tool for R410A,
diameter [mm (in.)]
clutch type
6.35 (1/4)
9.52 (3/8)
12.70 (1/2) 0 to 0.5
15.88 (5/8)
19.05 (3/4)
• When using conventional fl are tools to fl are R410A pipes, the dimension A should
be approximately 0.5mm more than indicated in the table (for fl aring with R410A
fl are tools) to achieve the specifi ed fl aring. Use a thickness gauge to measure the
dimension A.
Width across fl ats Pipe outside
diameter
[mm (in.)]
6.35 (1/4)
9.52 (3/8)
12.70 (1/2)
15.88 (5/8)
19.05 (3/4)
5. 4. 2. Bending pipes
To prevent breaking of the pipe, avoid sharp bends. Bend the pipe with a radius of
curvature of 100mm or more.
If the pipe is bent repeatedly at the same place, it will break.
• If pipes are shaped by hand, be careful not to collapse them.
• Do not bend the pipes at an angle of more than 90°.
• When pipes are repeatedly bent or stretched, the material will harden, making it dif-
fi cult to bend or stretch them any more.
• Do not bend or stretch the pipes more than 3 times.
CAUTION
B
Die
A
Pipe
Dimension B
- 0.4
[mm]
9.1
13.2
16.6
19.7
24.0
Width across fl ats
of Flare nut
[mm]
17
22
26
29
36
CAUTION
0