1-1131-112
4-4. HOW TO PROCESS TUBING
The liquid tubing side is connected by a flare nut, and
the gas tubing side is connected by brazing.
1. Connecting the Refrigerant Tubing
Use of the Flaring Method
Many conventional split system air conditioners employ
the flaring method to connect refrigerant tubes which run
between indoor and outdoor units. In this method, the
copper tubes are flared at each end and connected with
flare nuts.
Flaring Procedure with a Flare Tool
(1)
cutter. It is recommended to cut approx. 12 – 20 in.
longer than the tubing length you estimate.
(2)
Cut the copper tube to the required length with a tube
Remove burrs at each end of the copper tubing with
a tube reamer or file. This process is important and
should be done carefully to make a good flare. Be sure
to keep any contaminants (moisture, dirt, metal filings,
etc.) from entering the tubing. (Figs. 1-14 and 1-15)
(3)
mount it on the copper tube.
(4)
Remove the flare nut from the unit and be sure to
Make a flare at the end of the copper tube with a flare
tool. (Fig. 1-16)
NOTE
When reaming, hold the tube end downward and be sure
that no copper scraps fall into the tube. (Fig. 1-15)
NOTE
A good flare should have the following characteristics:
inside surface is glossy and smooth
edge is smooth
tapered sides are of uniform length
Fig. 1-14
Fig. 1-15
Fig. 1-16
Deburring
Before
After
Reamer
Copper
tubing
Flare tool
Flare nut
Copper
tubing
1
SM830203-04.indb 112 15/10/16 10:44:53
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