Extraction for 4 bathrooms

[Chector]

Hi I'm working with a landlord who has a house with 4 bathrooms, he wants extraction in all of them. I asked Manrose what they would recommend and they came back with a whole house extraction system. It runs constantly at a trickle extraction and can then be switched to boost. This is ideal as I want the boost switched on by the light switches in the bathrooms. The extraction system has one input for switched boost. How do I get 4 light switches to independently switch the extraction unit to boost. I'm thinking I need some kind of arrangement with relays, but I'm not sure how I would do it. Any help or advice would be greatly appreciated.

Thanks

 

[Toneyz]

P I R to each bathroom

 

[kenny7askew]

double pole light switches maybe

 

[Chector]

P I R to each bathroom

Thanks Anthony, I'm not sure how that will help. Please can you explain further

 

[Chector]

double pole light switches maybe

Thanks Kenny, how would that work?

 

[kenny7askew]

Thanks Kenny, how would that work?

you use the pole of the switch thats not used for lighting to switch the fan on

 

[Leesparkykent]

As above double pole light switch at each bathroom. 1 pole switches the light and other pole switches the fan.http://www.mkelectric.com/en-gb/Products/WD/logicplus/plateswitches/10AMPflush/Pages/K4876WHI.aspx

 

[Chector]

So here is what I'm thinking. I obviously can't stuff all the switched lives for the bathroom lights into the boost on the fan as this will light up all the lights in all the bathroom when one light is switched. So perhaps I take all the switched lives to a relay ( i.e. 4 relays) and connect all relays to the switched live boost on the fan.

 

[Octopus]

4 separate fans might be easier!

 

[Toneyz]

Are all the bathroom lights fed from the same lighting circuit ?

 

[Chector]

you use the pole of the switch thats not used for lighting to switch the fan on

I'm probably being a bit dim, but wouldn't that mean you either have the light on or the fan boost on but not both at the same time? I need the fan to be boosted when the light is on and to go back to trickle when the light is off.

 

[Chector]

Are all the bathroom lights fed from the same lighting circuit ?

Yes they are

 

[kenny7askew]

thats why its double pole you do both at the same time

I'm probably being a bit dim, but wouldn't that mean you either have the light on or the fan boost on but not both at the same time? I need the fan to be boosted when the light is on and to go back to trickle when the light is off.

 

[Leesparkykent]

I'm probably being a bit dim, but wouldn't that mean you either have the light on or the fan boost on but not both at the same time? I need the fan to be boosted when the light is on and to go back to trickle when the light is off.

No its a simple circuit. For example feed the switch, 1 pole switches the light in that particular bathroom other pole switches the boost on the fan. Same for all four bathrooms. When the light switch is closed it closes both poles,which switches the light on for that bathroom and switches the boost for the fan.

 

[Chector]

No its a simple circuit. For example feed the switch, 1 pole switches the light in that particular bathroom other pole switches the boost on the fan. Same for all four bathrooms. When the light switch is closed it closes both poles,which switches the light on for that bathroom and switches the boost for the fan.

Thanks Lee I'm must be confusing 2 pole and 2 way switches.

 

[Toneyz]

Do you know what fan unit you are fitting ?
Can I assume the bathooms have windows

 

[Chector]

Manrose MANI2000. But I think Lee's double pole light switches will do the job

 

[Leesparkykent]

Manrose MANI2000. But I think Lee's double pole light switches will do the job

It will, draw it out and you'll see

 

[Toneyz]

My thoughts were feed fan via switched fused spur from that lighting circuit and as you will be taking a duct to each bathroom take a 3 core and cpc cable to a PIR (you can daisy chain or run to each its up to you what is easier) L,N and switch for boost

I can see where the D.P. switch idear is comming from but if you have windows you won't turn on switch for boost in day time
you will have to get cable down wall to switch also and if there is no boost timer in fan as soom as the light switch is turned off
boost will stop.
You will needto be carefull that if the bathroom door is left open when not in use the PIR is positioned /masked as not to pick up passing by

 

[Resu]

EDIT: Never read all replies.