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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. (30 -
50 cm) longer than the tubing length you estimate.
(2) Remove burrs at the end of the copper tube with a tube
reamer or a similar tool. This process is important and
should be done carefully to make a good flare. (Fig. 5-1)
N OT E
When reaming, hold the tube end downward and be sure
that no copper scraps fall into the tube. (Fig. 5-2)
(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. 5-3)
N OT E
A good fl are 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 to the matching
surfaces of the flare and union before connecting them
together. This is effective for reducing gas leaks. (Fig.
5-4)
(3) For proper connection, align the union tube and flare
tube straight with each other, then screw in the flare nut
lightly at first to obtain a smooth match. (Fig. 5-5)
●
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 fl are.
After
Before
Deburring
Copper
tubing
Reamer
Fig. 5-1
Fig. 5-2
Fig. 5-3
Fig. 5-4
Fig. 5-5
Flare nut
Copper
tubing
Flare tool
Apply refrigerant
lubricant.
Flare nut
Union
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Summary of Contents for S-18MK2U6
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