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4 Installation of Connecting Pipe
4.1 Refrigerant pipe
1) Flaring
Use a pipe cutter to cut the refrigerant pipe and a pipe expander to flare
Fig. 4-1 Cutting Pipe of Connecting Pipe
2) Fastening nut
Align the connecting pipe, tighten it by hand, and then by a wrench.
Fig. 4-2 Tightening Schematic Diagram
!
NOTE
· To prevent the copper pipe from internal oxidation upon welding, the copper pipe shall be filled with nitrogen. Otherwise, the oxide skin
will block the refrigeration system!
· When fastening the nut, too strong force will damage 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!
4.2 Set refrigerant pipe dimension and pipe connecting steps
Name of Pipes
Main pipe
Main pipe of indoor unit
Branch pipe of indoor unit
Distributor components
of indoor unit
1) Connecting mode I
L
1
A
First distributor
Burr
Rough
Inclined
Table 4-3 Definition of Pipe
Pipe between the outdoor unit and the first distributor at the indoor unit side
Pipe behind the first distributor at the indoor side and indirectly
connected to the indoor unit
Pipe behind the distributor and directly connected to the indoor unit
Pipe components to connect the main pipe, main branch pipe and branch pipe
L
3
L
2
B
b
a
Fig. 4 -3 Connecting mode I
Table 4-1 Flaring Dimension of Connecting Pipe
Outer
Diameter
Maximum Minimum
(mm)
6
4
8
φ
.
.
9
5
12
Φ
.
12
7
15
Φ
.
15
9
19
Φ
.
Table 4-2 Tightening Torque
Pipe Dimension (mm)
Φ6.4
Φ9.5
Φ12.7
Φ15. 9
Connecting Position of Pipe
L
5
L
4
D
C
d
c
4
A
m m
(
)
7
8
3
.
4
12
0
.
.
8
15
4
.
.
0
18
6
.
.
Tightening Torque (Nm)
14. 2～17. 2( 144～176 k gf•cm)
32. 7～39. 9( 333～407 k gf•cm)
49. 5～60. 3( 504～616 k gf•cm)
61.8～75.4(630～770 k gf•cm)
Code
L1
L 2
L 5
~
,
,
,
,
A,b
c
d
e
f
,
,
,
,
A
B
C
D
E
f
E
e
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