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Piping Length & Elevation
If the pipe is too long, both the capacity and reliability of
the unit will drop. As the number of bends increases,
resistance to the flow of refrigerant system increases, thus
lowering cooling capacity. As a result, the compressor may
become defective. Always choose the shortest path and
follow the recommendations as tabulated below:
REFRIGERANT PIPING
Outdoor Unit
Indoor Unit
Piping Works
• Do not use contaminated or damaged copper tubing. Do
not remove plastic, rubber plugs and brass nuts from the
valves, fittings, tubings and coils until you are ready to
connect suction or liquid line into valves or fittings.
• 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.
• 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.
• Insert the flare 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 flaring tool as
shown in the table.
• The flared edge must be even and not cracked or scratched.
Ø Tube, D A (mm)
Inch mm Imperial Rigid
1/4" 6.35 1.3 0.7
3/8" 9.52 1.6 1.0
1/2" 12.70 1.9 1.3
5/8" 15.88 2.2 1.7
3/4" 19.05 2.5 2.0
Piping Connection To The Units
• Align the center of the piping and tighten the flare nut
sufficiently with fingers.
• Finally, tighten the flare nut with the torque wrench until
the wrench clicks.
Pipe Size mm/(in) Torque Nm/(ft - lb)
6.35 (1/4) 18 (13.3)
9.53 (3/8) 42 (31.0)
12.7 (1/2) 55 (40.6)
15.88 (5/8) 65 (48.0)
19.05 (3/4) 78 (57.6)
Remark: The refrigerant pre-charged in the outdoor unit
is for piping length up to 7.5m.
Cutting copper tube
1/4t
Remove burr
Copper tube
Swaging block
*Be sure to add the proper amount of additional refrigerant.
Failure to do so may result in reduced performance.
Indoor piping
Flare nut
Flared tube
Flare joint
Spanar
Torque wrench
LH
Model 09/10 15 20 25
Min. allowable length (L)
3m 3m
Max. allowable length (L)
12m 15m
Max. allowable height (H)
5m 8m
Gas pipe
3/8" 1/2" 5/8"
Liquid pipe 1/4" 1/4" 3/8"
1 IM-WMJ-1207(2)_EN 11/20/09, 4:32 PM9
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