Hello all, I am hoping that somebody can help me with this query.
I have recently purchased an extractor fan which has an integral Humidistat which as I understand it, although there is a constant electrical connection, should only switch on the fan when it detects humidity and stop the fan when the humidity is cleared.
The 2x fans I have tried so far don't appear to work in that way.
The query I have is the wiring diagrams provided by the manufacturer (see attached)
They suggest that using Diag B, the Humidistat will work but using Diag A will disable the Humidistat but my query is:
Isn't Diag A basically the same wiring as Diag B but without the pull switch and light bulb and therefore should both work the same.



Regards

Moderators note : cropped image

 

The fan has three terminals, L, N, and a third one which I can't read the label on.
Diagram A connects this third terminal permanently to live. The fan will run whenever power is applied.
Diagram B connects the third terminal to mains live via the switch on the humidistat. Now the fan will only run when commanded by the humidistat.

 

Hello,

@AlbertHall , the third terminal is called Ls.

Bertus

 

thanks for replies guys but my query is, surely both circuits would do the same thing as the only difference is that Diag B has a switches and lamp included so that when the switches are closed its the same as connecting Live to the Live Switched as in Diag A, or am i misunderstanding something?

 

Hello,

In Diag A , the L and Ls are bridged, there is no control.
In Diag B, the Ls is switched, it is controlled by the humidistat.

Bertus

 

That's not a switch and a lamp, it is a switch and a relay. The relay us controlled buy the humidistat.

 

That's not a switch and a lamp, it is a switch and a relay. The relay us controlled buy the humidistat.

That does not match any symbol for a relay that I have ever seen. ANd even woorse, none of the pictures is a circuit diagram, they are hookup drawings that offer not much clue about what is the function of any terminal. The second diagram certainly appears to have been drawn so as to confuse.