Installation Manual

71
5. HOW TO PROCESS TUBING
The liquid tubing side is connected by a fl are 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 fl aring method to connect refrigerant tubes which run
between indoor and outdoor units. In this method, the
copper tubes are fl ared at each end and connected with
fl are 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.
(2) Remove burrs at the end of the copper tube with a tube
reamer or fi le. This process is important and should be
done carefully to make a good fl are. (Fig. 5-1)
NOTE
When reaming, hold the tube end downward and be sure
that no copper scraps fall into the tube. (Fig. 5-2)
(3) Remove the fl are nut from the unit and be sure to
mount it on the copper tube.
(4) Make a fl are at the end of copper tube with a fl are
tool. (Fig. 5-3)
NOTE
A good fl are should have the following characteristics:
inside surface is glossy and smooth
●
edge is smooth
●
tapered sides are of uniform length
●
Deburring
AfterBefore
Fig. 5-1
Copper
tubing
Reamer
Fig. 5-2
Copper
tubing
Flare nut
Flare tool
Fig. 5-3
VRF_Indoor_US.indb 71VRF_Indoor_US.indb 71 2011/09/30 12:23:132011/09/30 12:23:13