How To Process Tubing; Connecting The Refrigerant Tubing - Sanyo 26 series Installation Instructions Manual

9. HOW TO PROCESS TUBING

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

9-1. Connecting the Refrigerant Tubing

Use of the Flaring Method
Many 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. 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 file. This process is impor-
tant 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. 9-1 and 9-2)
NOTE
When reaming, hold the tube end downward and be
sure that no copper scraps fall into the tube. (Fig. 9-2)
(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 the copper tube with a
flare tool.* (Fig. 9-3)
*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
Flare size: A (inch)
Copper tubing
(Outer dia.)
ø1/4
ø3/8
ø1/2
ø5/8
96
Deburring
After
Fig. 9-1
Copper
tubing
Reamer
Fig. 9-2
Flare nut
Flare tool
Fig. 9-3
0
A
– 0.4
23/64
33/64
21/32
25/32
Copper
tubing