How To Process Tubing; Connecting The Refrigerant Tubing - Panasonic R410A Installation Instructions Manual

6. HOW TO PROCESS TUBING

The liquid tubing side is connected by a fl are nut, and
the gas tubing side is connected by brazing.

6-1. Connecting the Refrigerant Tubing

Use of the Flaring Method
Many conventional split system air conditioners employ
the fl aring method to connect refrigerant tubes which run
between indoor and outdoor units. In this method, the
copper tubes are fl ared at each end and connected with
fl are 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. 12 – 20 in.
longer than the tubing length you estimate.
(2) Remove burrs at each end of the copper tubing with
a tube reamer or fi le. This process is important and
should be done carefully to make a good fl are. Be sure
to keep any contaminants (moisture, dirt, metal fi lings,
etc.) from entering the tubing. (Figs. 6-1 and 6-2)
NOTE
When reaming, hold the tube end downward and be sure
that no copper scraps fall into the tube. (Fig. 6-2)
(3) Remove the fl are nut from the unit and be sure to
mount it on the copper tube.
(4) Make a fl are at the end of the copper tube with a fl are
tool. (Fig. 6-3)
NOTE
A good fl are should have the following characteristics:
inside surface is glossy and smooth
edge is smooth
tapered sides are of uniform length
Deburring
Before
Fig. 6-1
Fig. 6-2
Flare tool
Fig. 6-3
24
After
Copper
tubing
Reamer
Flare nut
Copper
tubing