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5. HOW TO PROCESS TUBING
Must ensure mechanical connections be accessible for maintenance purposes.
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 that 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 estimate.
(2) Remove burrs at each end of the copper tubing with a tube
reamer or a similar tool. This process is important 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.
NOTE
When reaming, hold the tube end downward and be sure that no
copper scraps fall into the tube.
(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.
NOTE
When flared joints are reused, the flare part shall be re-fabricated.
A good flare should have the following characteristics:
● inside surface is glossy and smooth
● edge is smooth
● tapered sides are of uniform length
Caution Before Connecting Tubes Tightly
(1) Apply a sealing cap or water-proof tape to prevent dust or
water from entering the tubes before they are used.
(2) Be sure to apply refrigerant lubricant (ether oil) to the inside
of the flare nut before making piping connections. This is
effective for reducing gas leaks.
(3) For proper connection, align the union tube and flare tube
straight with each other, then screw on the flare nut lightly at
first to obtain a smooth match.
● Adjust the shape of the liquid tube using a tube bender at the
installation site and connect it to the liquid tubing side valve
using a flare.
Apply refrigerant lubricant.
Union Flare nut
Copper
tubing
Reamer
Flare nut
Flare tool
Copper
tubing
Deburring
Before After
01_330918_EU_Eng.indb 83 2021/9/9 11:27:07
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