Part 3 - S
yst
em Design and Ins
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Amazon Unitario Top Discharge
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5.3.5 Bending piping
Bending copper piping reduces the number of brazed joints required and can improve quality and save material.
Notes for installers
Piping bending methods
Hand bending is suitable for thin copper piping (Ф6. 35mm - Ф12. 7mm).
Mechanical bending (using a bending spring, manual bending machine or powered bending machine) is
suitable for a wide range of diameters (Ф6. 35mm - Ф54.0mm).
Caution
When using a spring bender, ensure that the bender is clean before
inserting it in the piping.
After bending a copper pipe, ensure that there are no wrinkles or
deformation on either side of the pipe.
Ensure that bend angles do not exceed 90°, otherwise wrinkles may
appear on the inner side of the pipe, and the pipe may buckle or
crack. Refer to Figure 3-5.3.
Do not use a pipe that has buckled during the bending process;
ensure that the cross section at the bend is greater than 2/3 of the
original area.
Figure 3-5.3: Pipe bending in excess of 90°
Wrinkles may
appear
5.4 Refrigerant Piping Supports
When the air conditioner is running, the refrigerant piping will
deform (shrink, expand, droop). To avoid damage to piping, hangers
or supports should be spaced as per the criteria in the Table 3-5.2. In
general, the gas and liquid pipes should be suspended in parallel and
the interval between support points should be selected according to
the diameter of the gas pipe.
Table 3-5.2: Refrigerant piping support spacings
Pipe (mm)
Interval between support points (m)
Horizontal Piping
Vertical Piping
< Ф20
1
1.5
Ф20 – Ф40
1.5
2
>
Ф40
2
2.5
Suitable insulation should be provided between the piping and the supports. If wooden dowels or blocks are to be used,
use wood that has undergone preservative treatment.
Changes in refrigerant flow direction and refrigerant temperature result in movement, expansion and shrinkage of the
refrigerant piping. Piping should therefore not be fixed too tightly, otherwise stress concentrations may occur in the
piping, with the potential for rupturing.
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