Timer extractor fan to non timer extractor fan

[TNDU]

I have done this before but I can't remember the answer as my memory is poor. Please can someone remind me here?

I have changed the extractor fan that has a timer at a property before with one that does not have a timer. There is a permament live and switched-live wire for the old fan but the new one doesn't need the permanent live wire.

I have read on google just now that you can terminte the permanent live wire in a block and forget about it and just use the switched live wire feed to the extractor fan.

Why do I have a faint recollection that this doesn't work? That you still need the permanent live wire connected somewhere on the fan? I have a faint recollection of putting both live wires into the live terminal of the new fan. Is this correct or am I remembering incorrectly?

The reason I asking is that I have a similar set up for an external flood light with PIR and I want to disable the PIR by disconnecting the permanent live wire and leaving the switched live wire connected as the PIR unit (which is wired separately) has become faulty.

 

[EFLImpudence]

I have read on google just now that you can terminte the permanent live wire in a block and forget about it and just use the switched live wire feed to the extractor fan.

Yes, that is the way to do it.

Why do I have a faint recollection that this doesn't work? That you still need the permanent live wire connected somewhere on the fan? I have a faint recollection of putting both live wires into the live terminal of the new fan. Is this correct or am I remembering incorrectly?

Not correct.

If there is no permanent live available then connecting the switched live to both terminals is how to get a timer fan to work without the timer.

The reason I asking is that I have a similar set up for an external flood light with PIR and I want to disable the PIR by disconnecting the permanent live wire and leaving the switched live wire connected as the PIR unit (which is wired separately) has become faulty.

That depends how it is wired.

 

[Jurassicspark]

Why do I have a faint recollection that this doesn't work? That you still need the permanent live wire connected somewhere on the fan? I have a faint recollection of putting both live wires into the live terminal of the new fan. Is this correct or am I remembering incorrectly?

Connect the switched live to PL, then add a short piece of wire to link the PL to the SL (Switched live) terminal.

 

[EFLImpudence]

Connect the switched live to PL, then add a short piece of wire to link the PL to the SL (Switched live) terminal.

That is not the OP's situation.

He is going to fit a non-timer fan.

 

[TNDU]

That is not the OP's situation.

He is going to fit a non-timer fan.

yes, i am wondering what to do about this permanent live wire that i no longer need, that used to feed the timer. sounds like i can just end it and not use it and the switched live wire on its own is going to be fine. strange i remembered doing something else but then again my memory is pretty non existent!

 

[EFLImpudence]

Yes, just put a piece of connector block on it and position out of the way.

 

[TNDU]

Yes, just put a piece of connector block on it and position out of the way.

So I finally got round to doing this job! And it doesn't work

First I tried to isolate the switched live cable in a block and forget about it. The light switches on when the power is back but then it switches off and I can't get it to switch on again by moving about in front of the motion detector.

Then I isolated the switched live cable and used the permanent live cable instead and that doesn't work at all.

Then I connected both the SL and PL together and that only worked when I tun the switch on and then it stops working.

Do you think the light is faulty? I was thinking may be I could use a ceiling light pendant to test the wiring so I eliminate the PIR not working factor.

 

[Taylortwocities]

I think you need a two/ probe voltage tester.

 

[TNDU]

I think you need a two/ probe voltage tester.

how would that help?

 

[endecotp]

So I finally got round to doing this job! And it doesn't work

This is confusing because you’re talking about a timer fan and also a light with a PIR. They are different!

It looks like you’re now talking about the PIR light. Making this work without the PIR will depend on how it was wired up previously. Did it:

(a) switch off = light off, switch on = light on when PIR activates, or
(b) switch off = light on when PIR activates, switch on = light permanently on

?

 

[TNDU]

This is confusing because you’re talking about a timer fan and also a light with a PIR. They are different!

It looks like you’re now talking about the PIR light. Making this work without the PIR will depend on how it was wired up previously. Did it:

(a) switch off = light off, switch on = light on when PIR activates, or
(b) switch off = light on when PIR activates, switch on = light permanently on

?

You are right. It is confusing, so I have started a new thread.