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ATN - Piercing Pliers
Piercing pliers have a hollow needle and are placed on a copper pipe in order to punch trough. Originally they are made to only degas a refrigerator and not for draining the oil. The needle has an opening of 1,5 mm where the oil should also go through. When the oil is warm enough it will flow trough but when cold it will take more than 15 minutes to drain.
Bleeder tables are often used for collecting the rest of the oil when the compressor is taken of the refrigerator. During that procedure refrigerant will escape into the environment.
The refrigerator has to be placed in an angled position to make sure that as much as possible oil will be drained. When there is a steel pipe instead of a copper one the needle will break. After placing the piercing pliers there has to be a valve manually opened. When forgotten, the refrigerator will not be drained and is leak when the pliers is removed. Due to the place of piercing and the small hole in the needle recovery time is very long.
- Slow draining up to 15 minutes
- Bad recovery. Oil is only drained for 80%
- Needle is easy to break.
- Not all refrigerators have copper piping.
- Opening in needle is easy to block. Due to this
- there will be no recovery.
- No indication if needle has punctured pipe
- correctly.
- Much space required for logistics
- Long handling time
- Large ex-zone
- Not "state of the art" technology.