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9. Refrigerant Piping
9.1 Flaring with Pipe Expander
Note: A good flare will have the following characteristics:
Inside surface is glossy and smooth.
Edge is smooth.
Tapered sides are of uniform length.
Remove the burrs at the end of the copper pipe
with a pipe reamer or file. When reaming, hold the
pipe bend downwards and be sure that no copper
scraps fall into the pipe. This process is important
and should be done carefully to make a good
flare. (Fig 9.1, 9.2)
Remove the flare nut from the unit and be sure to
mount it on the copper pipe.
Make a flare at the end of copper pipe with a flaring
tool. (Fig 9.3)
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 entering into the pipes
before they are used.
Be sure to apply refrigerant lubricant on the surfaces
of the flare and union before connecting them
together to reduce gas leaks. (Fig 9.4)
For proper connection, align the union pipe and
flare pipe straight with each other, then tighten the
flare nut lightly to obtain a smooth match. (Fig 9.5)
Tighten the screw with torque wrench to prevent
leak of refrigerant. Carefully perform leakage testing
before running the appliance.
Oil trap
When the indoor unit is lower than outdoor unit and
height is larger than 5m, install an oil trap every
5m(height difference) on suction piping.
Slope: 1/200~1/250
To avoid storing too much oil in the oil trap, the oil trap
should be as short as possible.
The horizontal piping should be slope down along the
refrigerant flow direction, to bring the oil back to
compressor, the slope is about 1/200 to1/250.
In order to ensure cooling/heating performance better,
the refrigerant piping should be as short and straight as
possible.
Slope: 1/200~1/250
Oil trap
Installation and Maintenance
9.3 Heat Insulation of the Refrigerant Pipe
To avoid loss of heat and to prevent the
ground being wet by condensed water, all
refrigerant pipes must be insulated with suitable
insulating materials with minimum thickness is 6mm.
(See Fig 9.6)
9.4 Sealing the Pipes
Note: Do not bind the armoring tape too tightly because
this will decrease the heat insulation effect. Also ensure
that the condensed drain hose splits away from bundle
and drips smoothly from the unit and the piping.
The two refrigerant pipes (and electrical wire if local
codes permit) should be sealed together with white
armoring tape. The drain hose may also be
included and sealed together as a bundle with the
tubing. 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 Fig 9.7)
Clamp the piping bundle to the wall, using one
clamp approx. every 120cm.
9.5 Finishing the Installation
After completion of wrapping and insulation, seal the
hole on the wall with suitable seal against wind and rain.
Fig.9.1
Pipe
Reamer
Fig.9.3
Tapered nuts
Flarer
Fig.9.4
Apply refrigerant lubricant here
and there
Fig.9.7
18
.
Fig.9.2
Before
Fig.9.5
Pipe
Union
Fig.9.6
Clamp
Insulated pipes
After
Flare nut
Insulation
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