Another extractor fan wiring question

[chuckalicious]

Ok. Asked a similar question yesterday but this one is slightly different hence the new post.

I have just replaced a standard extractor fan with a humidistat/timer one.

The fan is powered from a fused switch. The old fan had a switched and permanent live and a neutral, as does the new one. The permanent and switched lives were connected with a wee loop of cable as well as the live cable.

I have done the same for the new fan but now it is just running constantly whereas I had hoped it would only turn on when the humidity was at the set level.

Should this work or does it need the 3 cables - 2 live and one neutral?

Thanks.

*Edit* I've removed the link to the switched live and I think it is working. Again would that sound right?

 

[EFLImpudence]

No need for the link if there is a PL wire and SL wire.

 

[chuckalicious]

There isn't a pl and a sl, that's the issue. Although I don't really want it triggered by a switch, I want it sitting monitoring the humidity and to turn on at a given point, not when someone turns say a light on.

 

[EFLImpudence]

... but you said there was a three-core and earth and it ran for the same amount of time, so it must be wired 'properly'.

If you connect the PL and SL terminals with a link it will run all the time.
If you don't want it to come on with the light then just connect the PL wire to PL terminal.

 

[chuckalicious]

... but you said there was a three-core and earth and it ran for the same amount of time, so it must be wired 'properly'.

If you connect the PL and SL terminals with a link it will run all the time.
If you don't want it to come on with the light then just connect the PL wire to PL terminal.

Sorry maybe I wasn't clear - the old fan had the 3 connectors but the cable was only 3 core, live, neutral and earth. There isn't a trigger switch which is why I assume there isn't a switched live.

I have indeed removed the switched live link and it is working fine.

Thanks for the help.

 

[EFLImpudence]

Ah, ok.

 

[EFLImpudence]

Surely, now though, it only works when the light is on.

 

[chuckalicious]

It's not connected to a light. It is on its own spur. The one in my other thread was the one connected to the light switch.

 

[EFLImpudence]

Ah, ok again.