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4.1 Refrigerant pipe
1. Flaring
Use a pipe cutter to cut the refrigerant pipe and a pipe expander to flare.
Inclined
90°
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
4. Installation of Connecting Pipe
Burr
Rough
Table 4-3 Definition of Pipe
Pipe between the air-conditioning 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
Table 4-1 Flaring Dimension of Connecting Pipe
Outer
Diameter
Maximum
(mm)
Φ6.4
8.7
Φ9.5
12.4
Φ12.7
15.8
Φ15.9
19.0
Φ19.1
23.3
Table 4-2 Tightening Torque
Pipe Dimension (mm)
Φ6.4
Φ9.5
Φ12.7
Φ15.9
Φ19.1
Connecting Position of Pipe
06
A(mm)
Minimum
8.3
12.0
15.4
18.6
22.9
Tightening Torque (Nm)
14.2～17.2(144～176 kgf•cm)
32.7～39.9(333～407 kgf•cm)
49.5～60.3(504～616 kgf•cm)
61.8～75.4(630～770 kgf•cm)
97.2～118.6(1115～1364 kgf•cm)
Code
L1
L2~L5
a,b,c,d,e,f
A,B,C,D,E
V.1
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