Wiring advice for multi room extractor fan

John Dinneen · Nov 1, 2018

Hi all

I have installed the 92430AW XPLUS 2 MULTI POINT VENTILATION UNIT I wired it in like for like with an old unit. The fan stays constantly on. Do I just wire in the switch lines into the L1, L2, L3? Or is there a way to wire this in. It's probably very simple but it's confusing me.

Pete999 · Nov 1, 2018

Is this unit a 3 phase unit? looks like it from your description, can you post the wiring diagram

Spoon · Nov 1, 2018

Pete999 said:
Is this unit a 3 phase unit? looks like it from your description, can you post the wiring diagram

Looks like its a 3 speed fan mate.

https://www.xpelair.co.uk/sites/default/files/rxg_assets/Xpelair_XPlus2AC_instructionmanual.pdf

Spoon · Nov 1, 2018

John Dinneen said:
Hi all

I have installed the 92430AW XPLUS 2 MULTI POINT VENTILATION UNIT I wired it in like for like with an old unit. The fan stays constantly on. Do I just wire in the switch lines into the L1, L2, L3? Or is there a way to wire this in. It's probably very simple but it's confusing me.

If what I have posted is the manual for the fan then there are 3 speeds. L1, L2 & L3.

Pete999 · Nov 1, 2018

Spoon said:
Looks like its a 3 speed fan mate.

View attachment 45382

https://www.xpelair.co.uk/sites/default/files/rxg_assets/Xpelair_XPlus2AC_instructionmanual.pdf

Looks a simple job, how exactly have you connected it up?

Pete999 · Nov 1, 2018

John Dinneen said:
Hi all

I have installed the 92430AW XPLUS 2 MULTI POINT VENTILATION UNIT I wired it in like for like with an old unit. The fan stays constantly on. Do I just wire in the switch lines into the L1, L2, L3? Or is there a way to wire this in. It's probably very simple but it's confusing me.

John have you bypassed the speed controller in any way

John Dinneen · Nov 1, 2018

I have wired it in like for like with the old one here is a pic of the old wiring. There are 3 rooms (2bathrooms 1 kitchen)and the fan needs to come on when each light is turned on.

John Dinneen · Nov 1, 2018

I know each L terminal is for the different speeds but how do I wire it for each room?

Pete999 · Nov 1, 2018

John Dinneen said:
I know each L terminal is for the different speeds but how do I wire it for each room?

John, sorry if this sounds stupid, but is this a like for like replacement, or something that has been purchased hoping that it will work, if it is a like for like, surely the connections for rooms wouldn't have been altered, without actually being on site it's very difficult to see the problems you are experiencing.

John Dinneen · Nov 1, 2018

It's not a like for like fan. There was a 5 core going to the old fan. I presumed it was 3 switch lines for each each room and N+E. This new fan has 5 terminals L1,L2 and L3 each for the fan speed. I don't know if I'm being stupid but how do I wire it so the fan just comes on and off when each light come on and off

westward10 · Nov 1, 2018

You need to trace where that cable goes to see how it is connected, can you show the old fan connections and are you 100% sure the fan was the issue. If those are three line returns from the rooms each will switch the fan at different speeds.

Pete999 · Nov 1, 2018

Presumption is the root of all evil John, like I said very hard to fault find at a remote location, I got my fingers rapped once for interrogating someone, but do you have electrical experience?

Spoon · Nov 1, 2018

John Dinneen said:
I don't know if I'm being stupid but how do I wire it so the fan just comes on and off when each light come on and off

From the manual:
"The fan is designed to run continuously 24 hours a day"

If you want it operating by the light switches then the wiring will need altering.

How did your old fan work?

John Dinneen · Nov 1, 2018

I have to go back to the clients tonight. Im guessing as its staying on one of the cores is a perminant live. So i will have to try and find the other line. Hopefully it has a wiring station for the fan somewhere.

Pete999 · Nov 1, 2018

??

Spoon said:
From the manual:
"The fan is designed to run continuously 24 hours a day"

If you want it operating by the light switches then the wiring will need altering.

How did your old fan work?

Wrong unit then Spoon??

Spoon · Nov 1, 2018

Pete999 said:
??
Wrong unit then Spoon??

Looks like it's not a 'like for like' replacement mate.
Maybe the OP can confirm the data sheet i have posted is the unit he has.

John Dinneen · Nov 1, 2018

Yeah that's the unit I have.

Spoon · Nov 1, 2018

John Dinneen said:
Yeah that's the unit I have.

So how did your original fan work?

John Dinneen · Nov 1, 2018

The client said that the fan unit came on when the lights for each room came on then off when the lights were off. But it was faulty when I went to swap it over

Spoon · Nov 1, 2018

John Dinneen said:
The client said that the fan unit came on when the lights for each room came on then off when the lights were off. But it was faulty when I went to swap it over

Then the person who wired up the original fan wired the switches into the fan circuit.

Have you checked out the 5 core cable to see what its wired to?

Octopus · Nov 1, 2018

John Dinneen said:
The client said that the fan unit came on when the lights for each room came on then off when the lights were off. But it was faulty when I went to swap it over

So you are a spark then?

I read the OP assuming you were a DIYer ...

Spoon · Nov 1, 2018

Murdoch said:
I read the OP assuming you were a DIYer ...

So did I.
I'm now concerned about an electrician who can't wire a switch into a circuit.

John Dinneen · Nov 1, 2018

Lol I am a Diyer but I have basic knowledge. Can I just put 3 switch lines into the different speeds and when all the lights are off the fan should stop?

Spoon · Nov 1, 2018

John Dinneen said:
Lol I am a Diyer but I have basic knowledge.

You said "the client". Which makes out you are getting payed for this, which raises the question of... Are you insured to do this work?

Spoon · Nov 1, 2018

Have you found out what the 5 core cable is wired to?

John Dinneen · Nov 1, 2018

I am insured yes I won't know till I'm there this evening

westward10 · Nov 1, 2018

The different speeds may mean the fan runs permanent on low speed and activation of the lighting in one of the rooms boosts it to a higher speed. You could then have a lower run over until it drops back to the low speed.

John Dinneen · Nov 1, 2018

Ok so put the perminant live into the low speed and the other lives into the higher speeds for boost.

westward10 · Nov 1, 2018

I am only assuming this is how it is connected. You need to find out exactly how the switching is connected, trial and error is not the best way forward.

John Dinneen · Nov 1, 2018

Ok mate cheers for the advise

Pete999 · Nov 1, 2018

John Dinneen said:
Lol I am a Diyer but I have basic knowledge. Can I just put 3 switch lines into the different speeds and when all the lights are off the fan should stop?

John the forum rules forbid us to give out advice that may cause harm to someone who obviously does no know what they are doing, nothing wrong with no knowing Mate, your best option would be to call on the expertise of an Electrician, who can actually see what the installation consists of, asking for advice on an internet forum for something of this nature, is in my opinion asking for trouble.

John Dinneen · Nov 1, 2018

Ok il give one a call and go through it with them

Pete999 · Nov 1, 2018

John Dinneen said:
Ok il give one a call and go through it with them

That's probably the best suggestion so far John, good luck with the problem, hope the Lecky sorts it out for you.

AJshep · Nov 1, 2018

Its a MEV fan, they run continuous have a read of this.

System 3 - Mechanical Extraction Ventilation - https://www.envirovent.com/specifier/about-us/building-regulations-part-f-ventilation/system-3-mechanical-extraction-ventilation/

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