How To Process Tubing - Panasonic S-200PE1E8 Technical Data & Service Manual

1

1-11. 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 of conventional split system air conditioners employ the flaring method to connect refrigerant tubes that 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
Cut the copper tube to the required length with a tube
(1)
cutter. It is recommended to cut approx. 30 – 50 cm longer
than the tubing length you estimate.
Remove burrs at each end of the copper tubing with a
(2)
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. 1-26 and 1-27)
NOTE
When reaming, hold the tube end downward and be sure that
no copper scraps fall into the tube. (Fig. 1-27)
(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 the copper tube with a flare tool.
(Fig. 1-28)
NOTE
A good flare should have the following characteristics:
inside surface is glossy and smooth
edge is smooth
tapered sides are of uniform length
Flare size: A (mm)
Copper tubing
0
A
(Outer dia.)
–0.4
ø6.35 9.1
ø9.52 13.2
ø12.7 16.6
ø15.88 19.7
ø19.05 24.0
1-42
Deburring
Before After
Copper
tubing
Reamer
Flare nut
Flare tool
Fig. 1-26
Fig. 1-27
Copper
tubing
Fig. 1-28