27
10.2 Refrigerant Tubing
10.2.1 Use of The Flaring Method
Many of the 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 flares nuts.
10.2.2 Flaring Procedure With A Flare Tool
•
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.
•
Remove burrs at the end of the copper
tube with a reamer or file. This procedure
is important and should be done carefully
to make a good flare. (Fig.25)
When reaming, hold the tube end
downward and be sure that no
copper scraps fall into the tube.
(Fig.26)
•
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.27)
(*Use "GRID" or equivalent.)
A good flare should have the
following charactcteristics:
- inside surface is glossy and
smooth.
- edge is smooth.
- tapered sides are of uniform
length.
10.2.3 Caution Before Connecting Tubes Tightly
•
Be sure to apply a sealing cap or water-
proof tape to prevent dust or water from
getting into the tubes before they are used.
•
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.28)
•
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.29)
Fig.25
Before After
Deburring
Reamer
Copper
tubing
Fig.26
Apply refrigerant
Iubricant here and here
Fig.28
Flare nut
Union
Fig.29
Fig.27
Flare tool
Flare nut
Copper
tubing
NOTE
NOTE
10. INSTALL OUTDOOR UNIT
Installation Service