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MWM-J_(ii) Application Information
Piping Works
• Do not use contaminated or damaged copper tubing. Do not remove plastic, rubber plugs and brass nuts
from the valves, fi ttings, tubings and coils until you are ready to connect suction or liquid line into valves or
fi ttings.
• If any brazing work is required, ensure that the nitrogen gas is passed through coil and joints while the
brazing work is being done. This will eliminate soot formation on the inside walls of the copper tubings.
• Cut the connection pipe with a pipe cutter.
Cutting copper tube
1/4t
• Remove burrs from cut edges of the pipes with remover. Hold the end of the pipe downwards to prevent
metal chips from entering the pipe.
Remove burr
• Insert the fl are nuts, mounted on the connection parts of both the indoor unit and outdoor unit onto the
copper pipes.
• Flare the pipe with extra length above the fl aring tool as shown in the table.
• The fl ared edge must be even and not cracked or scratched.
Ø Tube,
D (mm / in)
A (mm)
Imperial Die Rigid Die
6.35 / 1/4 1.3 0.7
9.52 / 3/8 1.6 1.0
12.70 / 1/2 1.9 1.3
15.88 / 5/8 2.2 1.7
19.05 / 3/4 2.5 2.0
Swaging block
Copper tube
Piping Connection to the Units
• Align the center of the piping and tighten the fl are nut suffi ciently with fi ngers.
• Finally tighten the fl are nut with torque wrench unit the wrench clicks.
• When tightening the fl are nut with torque wrench, ensure the direction for tightening follows the arrow on
the wrench.
Pipe Size (mm/in) Torque (Nm)
6.35 (1/4) 18
9.52 (3/8) 42
12.70 (1/2) 55
15.88 (5/8) 65
19.05 (3/4) 78
Indoor piping
Flare nut
Flared tube
are
o
nt
Spanar
Torque wrench
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