Design Guide | iC7 Series Liquid-cooled System Modules
NOTICE
OVERHEATING OF THE PIPES
If the pipe is overheated, the wall thickness and pressure resistance change, and the shape of the pipe collapses easily.
l Do not heat the pipes above 180 °C (356 °F).
NOTICE
UNEVEN HEATING OF THE PIPES
If the pipe is heated unevenly or over a too small area, it wrinkles easily when the pipe is bent. The wall strength and pressure
resistance at the wrinkled point is uncertain.
l Before bending the pipes, heat the pipes evenly and over the whole bending area.
6.4.7.1 Bending Pipes in the Air
1. Insert the silicon cord into the pipe and to the bending location.
It is recommended that the pipe end is at least 5 cm (2 in) from the bending area. If the bending area is too close to the
pipe end, the pipe end can become oval, which can cause the pipe and fitting joint to leak.
It is recommended to moisten the cord with distilled water to make it easier to insert into the pipe.
The cord is inserted into the pipe before it is heated, to produce equal counter pressure and to prevent the tube from
buckling. The hard pipe is easy to bend evenly with the cord inside.
2. Set the heat gun upright on the table and set the temperature to 350 °C (662 °F).
Make sure that the heat gun does not fall down.
3. Slowly move the pipe back and forth while rotating it over the heat gun.
The aim is to heat the pipe evenly over the entire bending area to around 150–170 °C (302–338 °F). Examples of heating
times:
¢ When making a simple L-bend, a suitable heating time is approximately 2 minutes for a distance of 5–10 cm (2–4 in).
¢ When making a U-bend, the heating time is approximately 4 minutes for 15–20 cm (6–8 in).
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.
4. Once the tube is heated all around the bending area, bend it to the desired shape.
The recommended minimum bending radius >30 mm (1.18 in).
5. Hold the pipe in the desired position and cool it quickly, for example, in a sink or under a tap.
Ü
If the pipe was heated enough, the bending is permanent.
6. 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.
7. After bending the pipe, check the circularity of the pipe ends.
Danfoss Drives Oy © 2024.03 AJ475942178716en-000101 / 172K2848A | 57
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