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PostPosted: Sun Feb 10, 2019 6:17 pm 
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Replacing my bathroom fan with a new timer fan (Envirovent Silent100 T).

I'd like to only switch the new fan on as per need basis for shower/bath, yet still have the timer function work which require the fan to have constant power. The bathroom light is sensor controlled and works independently of the power going to the fan.

Have been looking at this https://youtu.be/FBQ9Br2rSo4?t=708
but can't figure out how it would work without the light involved.

Any help greatly appreciated.


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PostPosted: Sun Feb 10, 2019 7:04 pm 
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Not sure I understand the question.

Are you saying that you want to have a fan with a timer controlled by a switch and nothing else?

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PostPosted: Sun Feb 10, 2019 7:45 pm 
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Yes.

I don't want to connect the fan to go on with the light as the light is sensor controlled which means the fan will go on every time light activates. To avoid that, I'm thinking to have a switch, that we can turn on the fan when it's required which is really only at baths/showers which is not every day.

The reason for the sensor light is simply convenience, you walk in light comes on, you leave it goes off without ever pressing a button.
Downside is when you walk past the bathroom and door is not closed the light comes on, so to avoid the fan coming on every single time you enter is to have a switch.
The old fan was on a separate power supply so can plug into that.

An example would be; We give our daughter a bath, turn on the fan whilst having the bath, once done we switch the fan off but it continues for the duration of whatever the timer is set too.


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PostPosted: Sun Feb 10, 2019 8:30 pm 
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Oh. I see.

Well the switch you have in your hand is not a lot of use in this case as it is a fan isolator switch. (Although you will still need one to isolate the fan, not to turn it on and off)

One other question i forgot to ask.

The existing fan, when does that come on / go off?

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PostPosted: Sun Feb 10, 2019 8:52 pm 
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Existing fan stopped working a while ago but on was turned on & stopped by pull cord.


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PostPosted: Sun Feb 10, 2019 9:20 pm 
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Oh, easy then.

Take the old fan out (Turn it off at its isolator switch first) Put the new fan in.
Connect existing supply wires to L & N of new fan.
Run a new cable from new fan to new switch. (The one you will stop and start fan with)
Connect cable to C and L1 on switch (or L1 and L2 if it has an L3 terminal)
Connect other end (that is in the fan) of the cable to L and LS on the new fan.

Switch isolator back on fan should start, leave it for 10 minutes, if its still going, press new switch ONCE and leave fan for 10 minutes it should have stopped. (Unless you set the run timer for more than 10 minutes)

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PostPosted: Sun Feb 10, 2019 9:23 pm 
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Great thank you very much. Will give this a try and get back to you with result.


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PostPosted: Mon Feb 11, 2019 8:04 pm 
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Ok that seems to work. This is how I've put it together.
When switch is in up position, fan is off. Switch down, fan comes on, runs until I switch off but continues to run until the timer stops the fan.

You've been really helpful. Thanks, really appreciate this!


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PostPosted: Mon Feb 11, 2019 9:49 pm 
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No problem. :-)

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Fret not, a forum is a collection of opinions. Above, are mine.

Which is correct? Metre or Meter? Click the link to find out more.

Working on anything electrical? have you got a multi meter? why not? Would you hit a nail with a shoe?

If gloom had a voice, it would be me. :mrgreen:

:idea1: How to post a picture on this forum Click here


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