How To Process Tubing; Connecting The Refrigerant Tubing - Sanyo SPWXDR124GH56A Manual Del Usuario

7. HOW TO PROCESS TUBING

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

7-1. 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 meth-
od, the copper tubes are flared at each end and con-
nected 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 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. 7-1 and 7-2)
NOTE
When reaming, hold the tube end downward and be
sure that no copper scraps fall into the tube. (Fig. 7-2)
(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. 7-3)
®
*Use "RIGID " or equivalent.
NOTE
A good flare should have the following characteristics:
●
inside surface is glossy and smooth
●
edge is smooth
●
tapered sides are of uniform length
DC̲Inverter̲Eng.indd 55 DC̲Inverter̲Eng.indd 55
Deburring
Before
Fig. 7-1
Fig. 7-2
Flare tool
Fig. 7-3
Flare size: A (mm)
Copper tubing
(Outer dia.)
ø6.35
ø9.52
ø12.7
ø15.88
55
After
GB
FR
DE
Copper
tubing
IT
Reamer
PT
GR
Flare nut
ES
Copper
tubing
0
A
– 0.4
9.1
13.2
16.6
19.7
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