Design of 3WAY VRF SYSTEM
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5. HOW TO PROCESS TUBING
5. HOW TO PROCESS TUBING
The liquid tubing side is connected by a flare 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 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)
(2)
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.
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. 2-19)
NOTE
When reaming, hold the tube end downward and be sure
that no copper scraps fall into the tube. (Fig. 2-20)
(3)
(4)
Remove the flare nut from the unit and be sure to
mount it on the copper tube.
Make a flare at the end of copper tube with a flare
tool. (Fig. 2-21)
NOTE
A good flare should have the following characteristics:
inside surface is glossy and smooth
edge is smooth
tapered sides are of uniform length
Deburring
After
Before
Fig. 2-19
Copper
tubing
Reamer
Fig. 2-20
Copper
tubing
Flare nut
Flare tool
Fig. 2-21
TD831158-00̲3WAY̲VRF̲SYS.indb 40
TD831158-00̲3WAY̲VRF̲SYS.indb 40
2012/01/23 17:30:19
2012/01/23 17:30:19
Summary of Contents for U-72MF1U9
Page 118: ...Section 8 TENTATIVE ...
