How To Process Tubing - Panasonic U-72MF2U9 Technical Data Manual

6. HOW TO PROCESS TUBING

The liquid tubing side is connected by a flare nut, and the gas
tubing side is connected by brazing.
6-1. 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. (0.3 - 0.6m) longer
than the tubing length you estimate.
(2) Remove burrs at the end of the copper tube with a tube
reamer or a similar tool. This process is important and
should be done carefully to make a good flare.
Deburring
Before
NOTE
When reaming, hold the tube end downward and be sure that no
copper scraps fall into the tube.
After
Copper
tubing
Reamer
34
2 - 39
Design of 3WAY VRF SYSTEM
(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.
Flare tool
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 nut
Copper
tubing
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