Sanyo ECO R410A - Manual (Page 39)

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5. HOW TO PROCESS TUBING
The liquid tubing side is connected by a flare nut, and the
gas tubing side is connected by brazing.
5-1. Connecting the Refrigerant Tubing
Use of the Flaring Method
Many of conventional split system air conditioners employ
the flaring method to connect refrigerant tubes which run
between indoor and outdoor units. In this method, the cop-
per tubes are flared at each end and connected with flare
nuts.
Flaring Procedure with a Flare Tool
(1) Cut the copper tube to the required length with a
tube cutter. It is recommended to cut approx. 1 – 2 ft.
longer than the tubing length you estimate.
(2) Remove burrs at the end of the copper tube with a
tube reamer or file. This process is important and
should be done carefully to make a good flare.
(Fig. 5-1)
NOTE
When reaming, hold the tube end downward and be sure
that no copper scraps fall into the tube. (Fig. 5-2)
(3) Remove the flare nut from the unit and be sure to
mount it on the copper tube.
(4) Make a flare at the end of copper tube with a flare
tool. (Fig. 5-3)
NOTE
A good flare should have the following characteristics:
● inside surface is glossy and smooth
● edge is smooth
● tapered sides are of uniform length
Deburring
Before After
Fig. 5-1
Reamer
Copper
tubing
Fig. 5-2
Flare tool
Flare nut
Copper
tubing
Fig. 5-3