Installation and Maintenance
9.2 Connecting piping between Indoor
and Outdoor Units
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.(Figure 9.4)
For proper connection, align the union tube and
flare tube straight with each other, then tighten the
flare nut lightly to obtain a smooth match. (Figure 89.5)
Tighten the sets crew with torque wrench to prevent
leak of refrigerant. Carefully test leak before running
the appliance.
Remove the burrs at the end of the copper tube
with a tube reamer or file. When reaming, hold the
tube bend downward and be sure that no copper
scraps fall into the tube. This process is important
and should be done carefully to make a good
flare.(Figure 9.1,9.2)
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.(Figure 9.3)
9.4 Taping the Tubes
Note: Do not bind the armoring tape too tightly because
this will decrease the heat insulation effect. Also be
sure the condensed drain hose splits away from bundle
and drips clear of the unit and the piping.
The two refrigerant tubes (and electrical wire if local
codes permit) should be taped together with white
armoring tape. The drain hose may also be included
and taped together as a bundle with the piping.
Wrap the tape from the bottom of the outdoor unit
to the top of the piping where it enters the wall. As
you wrap the piping, overlap half of each previous
tape. (See Figure 9.7)
Clamp the piping bundle to the wall, using one
clamp approx. every 120 cm.
9.5 Finishing the installation
After completion of wrapping and insulation, seal the
hole on the wall with suitable seal against wind and rain.
To avoid loss of heat and in prevention of the
ground being wet by condensed water, all
refrigerant tubes must be insulated with suitable
insulating materials whose minimum thickness will
be 6 mm. (See Figure 9.6)
9.3 Heat Insulation of the Refrigerant Tube
9.1 Flaring with Tube Expander
Note: A good flare have the following characteristics:
Inside surface is glossy and smooth.
Edge is smooth.
Tapered sides are of uniform length.
9.Refrigerant piping
Clamp
Insulated tubes
Tube
Tapered nuts
Flarer
Fig.9.3
Apply refrigerant lubricant here and there
Union Flare nut
Insulation
Tube
Reamer
Fig.9.1
Before
After
Fig.9.2
Fig.9.5
Fig.9.4
Fig.9.6
Fig.9.7
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