BGH BV-V28W/DHN1 Manual page 85

VRF 50/60Hz
4.3.3 Expanding copper piping ends
Notes for installers
• Ends of copper piping can be expanded so that another length of piping can be inserted and the joint brazed.
• Insert the expanding head of the pipe expander into the pipe. After completing pipe expansion, rotate the
copper pipe a few degrees to rectify the straight line mark left by the expanding head.
Caution
• Ensure that the expanded section of piping is smooth and even. Remove any burrs that remain after cutting.
Figure 3-4.1: Expanding copper piping ends
4.3.4 Flared joints
Flared joints should be used where a screw thread connection is required.
Notes for installers
• Before flaring 1/2H (half hard) piping, anneal the end of the pipe to be flared.
• Remember to place the flare nut on the piping before flaring.
• the flared opening is not cracked, deformed or scratched, otherwise it will not form a good seal and
refrigerant leakage may occur.
• The diameter of the flared opening should be within the ranges specified in Table 3-4.1. Refer to Figure 3-4.2.
Table 3-4.1: Flared opening size ranges
Pipe (mm) Flared opening diameter (A) (mm)
Ф6.35
Ф9.53
Ф12.7
Ф15.9
Ф19.1
• When connecting a flared joint, apply some compressor oil to the inner and outer surfaces of the flared opening
to facilitate the connection and rotation of the flare nut, ensure firm connection between the sealing surface
and the bearing surface, and avoid the pipe becoming deformed.
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
8.3 - 8.7
12.0 -12.4
15.4 - 15.8
18.6 - 19.0
22.9 - 23.3
Ensure
Figure 3-4.2: Flared opening