Danfoss iC7 Series Installation Manual page 24

Installation Guide | iC7 Series Liquid-cooled System Modules
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Figure 21: Pipe Bending Jig Example
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Pipe
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Pipe holders
4.
Set the heat gun temperature to 200 °C (392 °F).
5.
Slowly move the heat gun back and forth over the entire bending area.
The aim is to heat the pipe evenly over the entire bending area to around 150–170 °C (302–338 °F). When the pipe is heated
only at the outer edge, it takes time to heat the inner edge of the pipe as well. Therefore, the temperature used is fairly low
and, for example, when making a 180° bend with radius Ø32 mm (Ø1.26 in), the suitable heating time is 10 minutes.
Beware of overheating. If the pipe temperature rises above 180 °C (356 °F), it starts to melt, and the wall thickness can
change. As the temperature of the pipe approaches the melting point, the pipe changes color from cloudy to clear, and
starts to smell burned.
6.
Before removing the pipe from the jig, let it cool completely. The cooling takes more than 10 minutes.
To accelerate the cooling process, submerge the jig and pipe in water.
7.
Once the pipe has cooled, remove it from the jig.
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If the pipe was heated enough, the bending is permanent.
8.
Pull the cord out of the pipe. If the bend is steep, it can be necessary to open the bend slightly to get out the cord.
9.
After bending the pipe, check the circularity of the pipe ends.
A Ø16/13 mm (0.63/0.51 in) tube ferrule (for example, 1827-16-13 from Parker) can be inserted into the pipe as an aid to
assess the circularity of the pipe.
An alternative way to use the bending jig is to preheat the pipes as advised in
jig and let them cool down.
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Silicon cord
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Bending wheel
3.4.1 Bending Pipes in the
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Air, and then fold them into the