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PostPosted: Fri Jul 24, 2009 9:12 pm 
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I have recently purchased a new utility room extractor fan that fits on the wall.
My seventies house has wiring for this with colours red, blue and yellow, and a bare copper cable.
The fan is operated by a wall switch outside the utility room, and it operates the ceiling light also. It is double insulated,single speed and has no timer or other sensors.
The fan has 3 holes in a terminal to allow the wiring to enter, marked 1,2, and 3.
Number 1 hole has the letters S/L, number 2 has N and the number 3 hole I am not sure.
The fan is made by Silavent, and the model number is Mayfair single speed 70, MSS070B.
Although I have 3 cables, it seems that I only need to use two, since when offering up the fan unit to the wall case, there is just two electrical pin plugs that connect to the terminal socket unit.
I wanted to get in touch with them today, but they had all gone home for the weekend by 16:30hrs, just when they were needed!
Anyone with any experience with this model and the connections I should make, bearing in mind the old colour codes, would be greatly appreciated.
Thank you,
rookyspark


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PostPosted: Fri Jul 24, 2009 9:30 pm 
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Normally extractor fans have -

permanent live, which is live all the time.
Neutral
Switched live, this becomes live when the light switch is switched on.

Some fans have an earth and some don't, this is what the bare metal wire is for, but it should be covered by green and yellow sleeving.

If the fan does not have a built in timer then it just requires live and neutral to work.

So as your fan has a terminal marked S/L it looks like it is a timer model.

This should help -

bathroom extractor fan wiring

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PostPosted: Fri Jul 24, 2009 10:44 pm 
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ultimatehandyman.

Many thanks for your swift response!
The fan does not have a timer. It switches on only when the utility room is used by someone who switches it on outside the room. The switch operates the ceiling light at the same time and when anyone exits the room and switches off the light, the fan stops also.
Permanent live = what cable colour?
Neutral = what cable colour?
Swtched live = what cable colour?
My colours are red, blue and yellow.
When the front fan unit is fitted, the attached two-pin plug fits into the back wall unit to make the electrical connection.


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PostPosted: Fri Jul 24, 2009 11:17 pm 
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There is no set wiring standard for the switched and permanent live, but it is probably the Yellow wire that is the switched live.

So if you wire it with the Blue to the Neutral and then Yellow to the S/L it should work when the light is switched on and off.

If it doesn't work then you need the red wire!

You need to insulate the wire that you do not need.

Also you need to connect the earth wire (if there is one)

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PostPosted: Sat Jul 25, 2009 7:59 pm 
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ultimatehandyman
Couple of questions relating to your latest response.
If I wire it with the Blue to neutral and Yellow to S/L, and it is wrong - what is the worst that can happen!?
Can I swap as you suggest, without causing damage to either the fan or my house .... or me!
If one or the other wires work, then I will isolate the remaining cable, and thank you for that advice.
Do I need to connect to earth the copper cable if the machine is double-insulated?
You are being very helpful and thank you for your time.
rookyspark


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PostPosted: Sat Jul 25, 2009 8:07 pm 
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worst case scenario...yellow will be permanent live. when you switchit off it will still be running

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PostPosted: Sat Jul 25, 2009 8:42 pm 
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Thank you once more. I will go for the Blue to neutral and Yellow to S/L.
rookyspark


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PostPosted: Thu Aug 06, 2009 6:46 pm 
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wine~o
Thanks!
Wired up as you suggested. Fan works fine- and I am still here to tell the tale!
rookyspark


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