Changing a timer fan to a pull cord fan

[mcbeano]

Hi,

I currently have a timer fan in my bathroom. Whenever the light switch is turned on, the fan comes on.

I would like the fan to come on only when selected, so I have purchased a pull cord fan.

Is it just a matter of replacing the L and N terminals or is there more to it?

Thanks

 

[holmslaw]

..

 

[mcbeano]

Hi

Thanks for your help.

My current timer fan has a 3 core flex with 3 terminals,
L (permanent live)
N (neutral)
L1 (live from switch)

The pull cord fan I have just purchased has only 2 terminals,
L (Permanent live)
N (neutral)

For the new fan, can I just connect the L and N terminals and insulate the L1 wire.

Cheers.

Hi,

I currently have a timer fan in my bathroom. Whenever the light switch is turned on, the fan comes on.

I would like the fan to come on only when selected, so I have purchased a pull cord fan.

Is it just a matter of replacing the L and N terminals or is there more to it?

Thanks

 

[ericmark]

For a room without an opening window the fan needs a 15 minute run on. There are all sorts of conditions that need to be met. These include ensuring that by forcing air out of one room it does not cause fumes to be drawn into another room.
It is all laid out in Part F building regulations.
Is is available as free down load.
I would think a pneumatic time switch is best option for manual operation then it can neither be switched off too soon or left on too long.
But reading Part F there are so many things which will alter what is allowed I think you are best reading yourself.
See here to down load your copy

 

[ericmark]

Hi

Thanks for your help.

My current timer fan has a 3 core flex with 3 terminals,
L (permanent live)

Leave connected and take second wire to new switch

N (neutral)

leave as is

L1 (live from switch)

remove and replace with return from new switch

This will work but is not really best option as it does not include an isolator. Because fans do go wrong and when they do it is good to be able to isolate one normally fits an isolator as well. This unlike the pull switch will also remove the permanent live used to let fan run on 15 minutes.

Once you alter wiring it should conform with latest regulations which may mean you need an isolator with a RCD built in.