Refrigerant Piping; Flaring With Pipe Expander; Connecting Piping Between Indoor And Outdoor Units; Heat Insulation Of The Refrigerant Pipe - Hitachi air core 600 Installation & Maintenance Manual

8. Refrigerant Piping

8.1 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 8.1, 8.2)
Mount the flare nut on the copper pipe.
Make a flare at the end of copper pipe with a flaring
tool. (Fig 8.3)
8.2 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 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 leak effectively. (Fig 8.4)
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 8.5)
Tighten the set screw with torque wrench to prevent
leak of refrigerant. Carefully test for leakage before
starting the appliance.

8.3 Heat Insulation of the Refrigerant Pipe

To avoid loss of heat and in prevention of the
ground being wet by condensed water, all
refrigerant pipes must be insulated with suitable
insulating materials with minimum thickness of 6mm.
(See Fig 8.6)

8.4 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. .
Installation and Maintenance
The two refrigerant pipes (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 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 Figure 8.7)
Clamp the piping bundle to the wall, using one
clamp approx. every 120cm.

8.5 Finishing the Installation

After completion of wrapping and insulation, seal the
hole on the wall with suitable seal against wind and rain.
Fig.8.1
Pipe
Reamer
Fig.8.3
Tapered nuts
Flarer
Fig.8.4
Apply refrigerant lubricant here
and there
Fig.8.7
Insulated pipes
32
Fig.8.2
Before
Fig.8.5
Pipe
Union
Fig.8.6
Clamp
After
Flare nut
Insulation