How To Process Tubing - Panasonic U-72MF1U9 Technical Data Manual

5. HOW TO PROCESS TUBING

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
copper 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.
1
(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. 2-19)
NOTE
2
When reaming, hold the tube end downward and be sure
that no copper scraps fall into the tube. (Fig. 2-20)
(3) Remove the flare nut from the unit and be sure to
3
mount it on the copper tube.
(4) Make a flare at the end of copper tube with a flare
tool. (Fig. 2-21)
4 NOTE
A good flare should have the following characteristics:
inside surface is glossy and smooth
edge is smooth
5
tapered sides are of uniform length
6
7
8
Before
2 - 40
Design of 3WAY VRF SYSTEM
Deburring
After
Fig. 2-19
Copper
tubing
Reamer
Fig. 2-20
Flare nut
Copper
tubing
Flare tool
Fig. 2-21