EDM SYSHP MINI SPLIT 06 16

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Figure 3-3.4: Pipe bending in excess of 90°
Table 3-3.4: Refrigerant piping support spacings
3.5.5 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).
Cauon
▪ When using a spring bender, ensure that the bender is clean before inserng
it in the piping.
▪ Aer bending a copper pipe, ensure that there are no wrinkles or deformaon
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 3-3.4.
▪ Do not use a pipe that has buckled during the bending process; ensure that
the cross secon at the bend is greater than 2/3 of the original area.
3.6 Refrigerant Piping Supports
When the air condioning is running, the refrigerant piping will deform
(shrink, expand and droop). To avoid damage to piping, hangers or
supports should be spaced as per the criteria in the Table 3-3.4. 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.
Suitable insulaon should be provided between the piping and the supports. If wooden dowels or blocks are to be used, use wood
that has undergone preservave treatment.
Changes in refrigerant ow direcon and refrigerant temperature result in movement, expansion and shrinkage of the refrigerant
piping. Piping should therefore not be xed too ghtly, otherwise stress concentraons may occur in the piping, with the potenal
for rupturing.
Wrinkles may
appear
Pipe (mm)
Interval between support points (m)
Horizontal Piping Vercal Piping
< Ф20 1 1.5
Ф20 – Ф40 1.5 2
> Ф40 2 2.5