Flare Connection - Fujitsu AU*G36LRLA Design & Technical Manual

2-3.

FLARE CONNECTION

• Do not use mineral oil on a flared part. Prevent mineral oil from getting into the system as this
would reduce the lifetime of the units.
• While welding 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.
FLARING
„ „
• Use special pipe cutter and flare 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 flare nut (always use the flare nut attached to the indoor and outdoor units respectively)
onto the pipe and perform the flare processing with a flare tool.
Leakage of refrigerant may result if other flare 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 flared uniformly and is not cracked or scratched.
L
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)
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)
• When using conventional flare tools to flare R410A pipes, the dimension A should be
approximately 0.5 mm more than indicated in the table (for flaring with R410A flare tools) to
achieve the specified flaring. Use a thickness gauge to measure the dimension A.
Width across flats
Die
Dimension A [mm]
Flare tool for R410A, clutch type
0 to 0.5
0
Dimension B -
0.4
9.1
13.2
16.6
19.7
24.0
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)
- (05-14) -
CAUTION
B
A
Pipe
[mm]
Width across flats
of Flare nut [mm]
17
22
26
29
36