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Piping Connection
•
Do not use contaminated or damaged copper tubing. If any piping, evaporator or condenser had been exposed or had been
opened for 15 seconds or more, then vacuum and purge with field supplied refrigerant. Generally, do not remove plastic,
rubber plugs and brass nuts from the valves, fittings, tubing and coils until it is ready to connect suction or liquid line into
valves or fittings.
•
If any brazing work is required, ensure that nitrogen gas is passed through coil and joints while the brazing work is being
done. This will eliminate soot formation on the inside wall of copper tubings.
•
Cut the pipe stages by stages, advancing the blade of pipe cutter slowly. Extra force and a deep cut will cause more
distortion of pipe and therefore extra burr.
•
Remove burrs from cut edges of pipes with a remover. Hold the end of the pipe downward to prevent metal chips from
entering the pipe. This will avoid unevenness on the flare face which will cause gas leak.
•
Align the center of the piping and sufficiently tighten the flare nut with fingers. Finally, tighten the flare nut with torque
wrench until the wrench clicks.
•
Be sure to execute heat insulation. (polyurethane form with thickness more than 15 mm)
•
Except the outdoor unit which is pre-charge with refrigerant R22, the indoor unit and the refrigerant connection pipes must
be purged because the air that contain moisture remaining in the refrigerant cycle may cause malfunction to the compressor.
•
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.
Cutting Copper Tube
1/4t
Remove Burr
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.
Flare Joint
Indoor Piping
Spanar
All manuals and user guides at all-guides.com
Flared Tube
Flare Nut
Torque Wrench
1-11
Copper Tube
Swaging Block
Ø Tube, D
Inch
mm
1/4"
6.35
3/8"
9.52
1/2"
12.70
5/8"
15.88
3/4"
19.05
Pipe Size mm / (in)
6.35 (1/4)
9.53 (3/8)
12.7 (1/2)
15.88 (5/8)
19.05 (3/4)
A (mm)
Imperial
Rigid
1.3
0.7
1.6
1.0
1.9
1.3
2.2
1.7
2.5
2.0
Torque Nm / (ft - lb)
18 (13.3)
42 (31.0)
55 (40.6)
65 (48.0)
78 (57.6)
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