Manrose fan connection

Emmalenkhe · 28 Nov 2015

Please can someone kindly help me. I just bought a Manrose mf100t extractor fan, this is the timer model. My previous fan only required a live and neutral connection, however the Manrose fan needs a live, switched live and neutral connection. How do I convert my 2 wires to 3 wires for the Manrose fan. Thanks for your assistance.

PBC_1966 · 28 Nov 2015

If you don't need the timer function and just want the fan to run from whatever switch you used with the old fan, then you just link the live & switched live terminals together. If you actually want to use the timer feature, then you'll need to run in a new cable with an extra conductor.

PrenticeBoyofDerry · 28 Nov 2015

You cannot use the timed function, unless you have a three core cable to facilitate Perm live, switch live and neutral. There should also be a earth (CPC) present even if this is not required to be directly connected to the unit.
You have options:
*Use only the switched function via the two existing cables
*Run an extra live core or replace existing cable with 3 core & e
*Replace with a fan that does not have overrun

What ever you do do, do not use any earth/CPC as an additional live coonductor
Also you generally need a fan isolator, and if new cable is to be buried and routed into a location with bath/shower then RCD protection will be required, if not already present on that circuit.

sparkwright · 28 Nov 2015

Was the old fan a timer fan?

The reason I ask this is that some fans have a transformer where the timer is, and a 2 core cable can go from here to a low voltage 12V fan?

So before you do anything, check the old fan itself to see if there is a label that says 230/240 volts or 12 volts.

If it is 230/240V then PBC1966's advice is the way to go.

Emmalenkhe · 28 Nov 2015

Thank you all for your help. I want to use the timer function as our bathroom has no windows and easily steams up. How do I run an extra live wire.

sparkwright · 28 Nov 2015

sparkwright said:
Was the old fan a timer fan?

The reason I ask this is that some fans have a transformer where the timer is, and a 2 core cable can go from here to a low voltage 12V fan?

So before you do anything, check the old fan itself to see if there is a label that says 230/240 volts or 12 volts.

Answer this first.

Emmalenkhe · 28 Nov 2015

The old fan didn't have a timer. Unfortunately I didn't look at the label before I threw it away, just assumed it will be a straight connection. Wish I hadn't done that

stillp · 28 Nov 2015

sparkwright said:
a low voltage 12V fan?

Pardon?

sparkwright · 28 Nov 2015

You know exactly what I mean.

ban-all-sheds · 28 Nov 2015

Emmalenkhe said:
Thank you all for your help. I want to use the timer function as our bathroom has no windows and easily steams up. How do I run an extra live wire.

//www.diynot.com/wiki/Electrics:fan

sparkwright · 28 Nov 2015

Emmalenkhe said:
The old fan didn't have a timer. Unfortunately I didn't look at the label before I threw it away, just assumed it will be a straight connection. Wish I hadn't done that

Chances are it is a 230/240V fan.

If it wasn't there would be a transformer somewhere.

sparkwright · 28 Nov 2015

Fitting a timer extractor fan can be done in two ways.

The most common arrangement is so you turn the light on, fan comes on. Turn light on, fan continues running for a pre-determined time.

You COULD have the fan seperate from the light - so you turn on a seperate switch to turn on fan, then turn that switch off and again fan continues running for x minutes.

Having the timer fan to activate when the light is turned on is the most usual way (it's the only way people won't forget, assuming it's dark outside).

To do this you need to find a point in the bathroom light wiring that consists of permanent LIVE, switched LIVE, NEUTRAL and EARTH.

This may be at the light, or at the light switch, or at a junction box - house wiring can vary a lot.

You will also need a 3 pole fan switch - typically a wall switch outside the bathroom, or a pull switch in the bathroom. This 3 pole fan switch is for maintenance. For normal use this switch remains on all the time. However, it's useful for turning the fan off at night to prevent disturbing people at night when going to the loo.

Wiring from the supply, via a fan switch, is typically done in 3 core and earth flat cable.

How does your current fan get it's supply? Is it activated by a seperate pull cord or something?

PBC_1966 · 28 Nov 2015

sparkwright said:
You COULD have the fan seperate from the light - so you turn on a seperate switch to turn on fan, then turn that switch off and again fan continues running for x minutes.

A much better option than connecting into the light. I really don't understand why controlling the fan from the light switch has become so commonplace in Britain. Do you really want to have the fan running every time you just turn the light on for a minute in the middle of the night? And do you really need the light on every time you want to run the fan during the daytime?

JohnD · 28 Nov 2015

PBC_1966 said:
I really don't understand why controlling the fan from the light switch has become so commonplace in Britain.

It's because there are so many people who have a psychological aversion to ventilation.

PBC_1966 · 28 Nov 2015

JohnD said:
PBC_1966 said:

I really don't understand why controlling the fan from the light switch has become so commonplace in Britain.

Click to expand...

It's because there are so many people who have a psychological aversion to ventilation.

Trying to force ventilation on people by linking with the light could well be counter-productive though.

Anyone who is that averse to ventilation is likely to become so fed up with the fan running every time he switches on the light that he'll soon just disconnect the fan completely, then it won't get used at all, even in situations where otherwise he might have turned it on.

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Manrose fan connection

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