SYSVRF2 CASSETTE MINI IM

8
Connect the indoor unit before the outdoor unit.
Bend the tubing the correct way. Do not damage them.
Coat the surfaces of the flare pipe and the joint nuts with frozen
oil, and turn them for 3-4 rounds with your hands before using a
wrench. (Refer to Fig.6-1)
Use two wrenches simultaneously when you connect or
disconnect the pipes.
The stop valve of the outdoor unit should be fully closed (as per
the original state). Every time you connect the pipes, first loosen
the nuts at the stop valve. Then connect the flare pipe (within in
5 minutes). If the nuts have been loose for a long time, dusts and
other impurities may enter the pipe system and may cause a
malfunction. Expel the air out of the pipe with refrigerant before
connection.
Expel the air (refer to "Expel The Air") after connecting the
refrigerant pipe to the indoor and outdoor units. Then fasten the
nuts at the repair points.
Note for Bendable Pipes.
The bending angle should not exceed 90°C
The bending position is preferably for the bendable pipe. Larger
is better.
Do not bend the pipe more than three times.
Bend the connection pipe that has a thin surface.
Cut out a desired concave at the bending part of the insulating
pipe.
Then expose the pipe (cover it with tape after bending).
To prevent collapsing or deformation. Bend the pipe at its widest
radius.
Use a bender on low radius pipes.
Use a normal brass pipe.
Use the same insulating materials for the brass pipe. (More than
9 mm thick).
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6. INSTALL THE CONNECTION PIPE
Check whether the height drop between the indoor unit and
outdoor unit, the length of the refrigerant pipe, and the number
of the bends meet the following requirements:
The max height drop and length of refrigerant pipe depend on
the outdoor unit. (If the height drop is more than 10000 mm
position the outdoor unit above the indoor unit.)
The number of bends must be fewer than 15.
Do not let air, dust, or other impurities enter the pipe system
during installation.
The connection pipe should not be installed until the indoor and
outdoor units have been fixed.
Keep the connection pipe dry, and do not let moisture in during
installation.
The Procedure of Connecting Pipes
Measure the necessary length of the connection pipe, and install
it as follows.
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7. REFRIGERANT PIPE CONNECTION
7.1 Expel The Air
Locate The Pipe
Drill a hole in the wall (suitable just for the size of the wall conduit,
90 mm in general), then set the fittings such as the wall conduit
and its cover.
Bind the connection pipe and the wires together tightly with binding
tape. Do not let air in to avoid leaks due to condensation.
Pass the bound connection pipe through the wall conduit from
outside. Be careful of the pipe at all locations and do not damage
the tubing.
Connect the pipes.
Then, open the stem of the stop valves of the outdoor unit to
ensure regular flow in the refrigerant pipe that connects the indoor
and outdoor units.
Check for leaks with a leak detector or soapy water.
Cover the joint of the connection pipe to the indoor unit with the
sound proof/insulation sheath (fittings), and bind it well with the
tape to prevent leaks.
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Flaring
Cut a pipe with a pipe cutter.
Insert a flare nut into a pipe and flare the pipe.
Fig.7-1
Fig.6-1
Use frozen oil
Bend the pipe with your thumb
Use the method for unlocking
the coil to straighten the pipe
Fig.6-3
Fig.6-2
90
Lean crude burr