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4. HOW TO PROCESS TUBING
The narrow tubing side is connected by a flare nut,
and the wide tubing side is connected by brazing.
4-1. 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. 30
– 50 cm longer than the tubing length you esti-
mate.
(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. 4-1)
NOTE
When reaming, hold the tube end downward and be
sure that no copper scraps fall into the tube. (Fig. 4-2)
(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.* (Fig. 4-3)
(*Use "RIGID
®
" or equivalent.)
NOTE
A good flare should have the following characteristics:
G
inside surface is glossy and smooth
G
edge is smooth
G
tapered sides are of uniform length
Before
17
Deburring
After
Fig. 4-1
Copper
tubing
Reamer
Fig. 4-2
Flare nut
Flare tool
Fig. 4-3
Copper
tubing
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