TCL ITCA-60CHRA/DV3I, Technical Manual, Page: 72 / 113

DC Inverter Air
shall be paid to that the saw dust cannot enter the pipeline);
3) The flaring tool shall be used and the size of flare opening shall remain as follows:
Do not forget to consider the pipe nut in the situation specified for processing of flare opening.
Shape and Size of Flare Opening:
Dimension table (unit: mm)
Nominal size
Outer diameter D
0
A
F1/4 6.35 8.6‐9.0
F3/8 9.52 12.6‐13.0
F1/2 12.7 15.8‐16.2
F5/8 15.88 19.0‐19.4
F3/4 19.05 22‐22.4
Attention shall be paid to that the bore diameter of pipe nut shall be increased by 1mm based on the
dimension A; otherwise there is a possibility that the pipe nut cannot be assembled.
Pipe diameter “d”
（
mm
）
6.4 9.5 12.7 15.9 19.1
R22 flare size “A”
（
mm
）
8.8 12.8 16.2 19.4 23.7
R410A flare size “A”
（
mm
）
9.1 13.2 16.6 19.7 24.0
Notes: A. The flared side of R410A is deeper than that of R22;
B. The eccentricity between horn center and pipe center is set for 0.1mm or above;
C. There shall be no scar, crack and asperity at the horn position.
4) Apply the air‐conditioning oil on the inner and outer surface of the flare (for facilitating the smooth pass
of flare nut to prevent the distortion of the pipeline)
A. Carefully remove the burrs;
B. Use two wrenches to grab the pipe;
C. The flare nut shall be mounted onto the pipe before the pipe expansion operation;
D. The torque force shall be appropriate when using it to tighten the nut (standard torque ±10
％
)
Size
Torque
(kgf ∙m) (N∙cm)
1/4"(Φ6.4) 144‐176 1440‐1720
3/8"(Φ9.5) 133‐407 3270‐3990
1/2"(Φ12.7) 504‐616 4950‐6030
5/8"(Φ15.9) 630‐770 6180‐7540
3/4"(Φ19.0) 990‐1210 9270‐11860
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