4-1 Refrigerant piping
4-1-1 Flaring
Use a pipe cutter to cut the refrigerant pipe and use an expander to make a flaring.
4-1-2 Fastening nut
Align the connecting pipe, tighten it by hand, and then use a wrench to further tighten it
1.To prevent the copper pipe from internal oxidation, its welding must be done with nitrogen filled.
Otherwise, the oxide skin will plug the refrigeration system!
2.While the nut is being fastened, too much force will break the flared socket, but too weak force will
result in leakage. Please refer to the tightening torque in the table above to fasten the nuts.
!
Notice
4-2 Set refrigerant pipe dimension and joint pipe steps
Piping name
Main piping for indoor unit
Branch piping for indoor unit
Main pipe
Piping connecting position
Pipe from the outdoor unit to the first indoor branch
Code
L1
L L
2 5
~
a
,
b
,
c
,
d
,
e
,
f
A
,
B
,
C
,
D
,
E
4.Connecting pipe installation
8
Inclined
Rough
Burr
Branch manifold assembly
for indoor unit
Pipe after the first indoor manifold and indirectly
connected to the indoor unit
Pipe after the manifold and directly connected
to the indoor unit
Piping assembly for connecting the main pipe,
main branch piping and branch piping
External diameter
(mm)
A
(mm)
Maximum Minimum
8 7
.
12 4
.
15 8
.
19 0
.
8 3
.
12 0
.
15 4
.
18 6
.
Φ
6 4
.
Φ .
9 5
Φ
.
12 7
Φ
.
15 9
Φ
.
19 1
23 3
.
22
.
9
Piping
size
(
)
mm
Tightening torque
(N m
. )
Φ .
6 4
Φ .
9 5
Φ
.
12 7
Φ
.
1 5 9
14 2 17 2 N m
(
144
～
176
kgf
.
cm
)
. ～
. .
32 7 39 9 N m
(
333
～
407
kgf
.
cm
)
. ～
. .
49 5 60 3 N m
(
504
～
616
kgf
.
cm
)
. ～
. .
61 8 75 4 N m
(
630
～
770
kgf
.
cm
)
. ～
. .
97.2 11 8 . 6
N m
(
1115
～
1364
kgf
.
cm
)
～
.
Φ
.
1 9 1
V.2