10
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.
5-2.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.
30-50cm longer than the tubing length you
estimate.
(2)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.30)
When reaming, hold the tube end downward and be
sure that no copper scraps fall into the tube.
(Fig.31)
(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 copper tube with a
flare tool.
*
(Fig.32)
(
*
Use“RIGID”or equivalent.)
A
good
flare
should
have
the
following
characteristics:
·inside surface is glossy and smooth.
·edge is smooth.
·tapered sides are of uniform length.
5-3.Caution before Connecting Tubes Tightly
a) 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.
b) 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.33a)
c) 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.33b)
5-4.Connecting Tubing between Indoor and Outdoor
Units
a)Tightly connect the indoor side refrigerant
tubing
extended from
the outdoor
side
tubing.(Fig.34)
B) To fasten the flare nuts, apply specified
torque as:
NOTE
NOTE
Tube Dia.
6.35mm
12.7mm
9.52mm
Tightening Torque
Approx.15-20N.m
Approx.50-55N.m
Approx.35-40N.m
5.5 Insulation of Refrigerant Tubing
IMPORTANT
To prevent heat loss and wet floors due to dripping of
Cabinet
Access
panel
“C”
Fig.29
Before
After
Deburring
Fig.30
Copper
tubing
Reamer
Fig.31
Flare nut
Copper
tubing
Flare tool
Fig.32
Apply refrigerant
lubricant here and there
Union
Flare nut
Fig.33a
Fig.33b
Summary of Contents for KF-2302GWE
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