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The original video is in spanish.
The pressure switch and the hydrosphere are an almost inseparable pairing.
This video is intended to explain its functions in the installation, it is important to know what each element does to discriminate the faults that derive from its dysfunction.
When the existence of the Precontrol is mentioned as an alternative, it is for informational purposes because I did not see fit to ignore it. Their virtues and disadvantages make them ideal for one type of installation and not recommended for others. It is the good professional who must decide and its explanation is not the purpose of this video. Possibly it will be done in another future video. Thanks for understanding since the video had to end before the bomb exploded.
Thanks to Jorge, Iñaki and Aarón. Your help makes me feel that working is more fun.