I give you an example: the air conditioning istalacion you put a diode in the+ diilla, when the fan works to cool the water does not put the current to the air conditioning circuit. The short diode.
and in the + of the istalation of water you put reluctant and when the short surface is off so that the operation of air does not send + <the surrounding ground.
A lapiz scheme aria you but I don't know how the photos are put to see Aki on the web.
